yading@10: /* yading@10: * Wmapro compatible decoder yading@10: * Copyright (c) 2007 Baptiste Coudurier, Benjamin Larsson, Ulion yading@10: * Copyright (c) 2008 - 2011 Sascha Sommer, Benjamin Larsson yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * @brief wmapro decoder implementation yading@10: * Wmapro is an MDCT based codec comparable to wma standard or AAC. yading@10: * The decoding therefore consists of the following steps: yading@10: * - bitstream decoding yading@10: * - reconstruction of per-channel data yading@10: * - rescaling and inverse quantization yading@10: * - IMDCT yading@10: * - windowing and overlapp-add yading@10: * yading@10: * The compressed wmapro bitstream is split into individual packets. yading@10: * Every such packet contains one or more wma frames. yading@10: * The compressed frames may have a variable length and frames may yading@10: * cross packet boundaries. yading@10: * Common to all wmapro frames is the number of samples that are stored in yading@10: * a frame. yading@10: * The number of samples and a few other decode flags are stored yading@10: * as extradata that has to be passed to the decoder. yading@10: * yading@10: * The wmapro frames themselves are again split into a variable number of yading@10: * subframes. Every subframe contains the data for 2^N time domain samples yading@10: * where N varies between 7 and 12. yading@10: * yading@10: * Example wmapro bitstream (in samples): yading@10: * yading@10: * || packet 0 || packet 1 || packet 2 packets yading@10: * --------------------------------------------------- yading@10: * || frame 0 || frame 1 || frame 2 || frames yading@10: * --------------------------------------------------- yading@10: * || | | || | | | || || subframes of channel 0 yading@10: * --------------------------------------------------- yading@10: * || | | || | | | || || subframes of channel 1 yading@10: * --------------------------------------------------- yading@10: * yading@10: * The frame layouts for the individual channels of a wma frame does not need yading@10: * to be the same. yading@10: * yading@10: * However, if the offsets and lengths of several subframes of a frame are the yading@10: * same, the subframes of the channels can be grouped. yading@10: * Every group may then use special coding techniques like M/S stereo coding yading@10: * to improve the compression ratio. These channel transformations do not yading@10: * need to be applied to a whole subframe. Instead, they can also work on yading@10: * individual scale factor bands (see below). yading@10: * The coefficients that carry the audio signal in the frequency domain yading@10: * are transmitted as huffman-coded vectors with 4, 2 and 1 elements. yading@10: * In addition to that, the encoder can switch to a runlevel coding scheme yading@10: * by transmitting subframe_length / 128 zero coefficients. yading@10: * yading@10: * Before the audio signal can be converted to the time domain, the yading@10: * coefficients have to be rescaled and inverse quantized. yading@10: * A subframe is therefore split into several scale factor bands that get yading@10: * scaled individually. yading@10: * Scale factors are submitted for every frame but they might be shared yading@10: * between the subframes of a channel. Scale factors are initially DPCM-coded. yading@10: * Once scale factors are shared, the differences are transmitted as runlevel yading@10: * codes. yading@10: * Every subframe length and offset combination in the frame layout shares a yading@10: * common quantization factor that can be adjusted for every channel by a yading@10: * modifier. yading@10: * After the inverse quantization, the coefficients get processed by an IMDCT. yading@10: * The resulting values are then windowed with a sine window and the first half yading@10: * of the values are added to the second half of the output from the previous yading@10: * subframe in order to reconstruct the output samples. yading@10: */ yading@10: yading@10: #include "libavutil/float_dsp.h" yading@10: #include "libavutil/intfloat.h" yading@10: #include "libavutil/intreadwrite.h" yading@10: #include "avcodec.h" yading@10: #include "internal.h" yading@10: #include "get_bits.h" yading@10: #include "put_bits.h" yading@10: #include "wmaprodata.h" yading@10: #include "sinewin.h" yading@10: #include "wma.h" yading@10: #include "wma_common.h" yading@10: yading@10: /** current decoder limitations */ yading@10: #define WMAPRO_MAX_CHANNELS 8 ///< max number of handled channels yading@10: #define MAX_SUBFRAMES 32 ///< max number of subframes per channel yading@10: #define MAX_BANDS 29 ///< max number of scale factor bands yading@10: #define MAX_FRAMESIZE 32768 ///< maximum compressed frame size yading@10: yading@10: #define WMAPRO_BLOCK_MIN_BITS 6 ///< log2 of min block size yading@10: #define WMAPRO_BLOCK_MAX_BITS 13 ///< log2 of max block size yading@10: #define WMAPRO_BLOCK_MAX_SIZE (1 << WMAPRO_BLOCK_MAX_BITS) ///< maximum block size yading@10: #define WMAPRO_BLOCK_SIZES (WMAPRO_BLOCK_MAX_BITS - WMAPRO_BLOCK_MIN_BITS + 1) ///< possible block sizes yading@10: yading@10: yading@10: #define VLCBITS 9 yading@10: #define SCALEVLCBITS 8 yading@10: #define VEC4MAXDEPTH ((HUFF_VEC4_MAXBITS+VLCBITS-1)/VLCBITS) yading@10: #define VEC2MAXDEPTH ((HUFF_VEC2_MAXBITS+VLCBITS-1)/VLCBITS) yading@10: #define VEC1MAXDEPTH ((HUFF_VEC1_MAXBITS+VLCBITS-1)/VLCBITS) yading@10: #define SCALEMAXDEPTH ((HUFF_SCALE_MAXBITS+SCALEVLCBITS-1)/SCALEVLCBITS) yading@10: #define SCALERLMAXDEPTH ((HUFF_SCALE_RL_MAXBITS+VLCBITS-1)/VLCBITS) yading@10: yading@10: static VLC sf_vlc; ///< scale factor DPCM vlc yading@10: static VLC sf_rl_vlc; ///< scale factor run length vlc yading@10: static VLC vec4_vlc; ///< 4 coefficients per symbol yading@10: static VLC vec2_vlc; ///< 2 coefficients per symbol yading@10: static VLC vec1_vlc; ///< 1 coefficient per symbol yading@10: static VLC coef_vlc[2]; ///< coefficient run length vlc codes yading@10: static float sin64[33]; ///< sinus table for decorrelation yading@10: yading@10: /** yading@10: * @brief frame specific decoder context for a single channel yading@10: */ yading@10: typedef struct { yading@10: int16_t prev_block_len; ///< length of the previous block yading@10: uint8_t transmit_coefs; yading@10: uint8_t num_subframes; yading@10: uint16_t subframe_len[MAX_SUBFRAMES]; ///< subframe length in samples yading@10: uint16_t subframe_offset[MAX_SUBFRAMES]; ///< subframe positions in the current frame yading@10: uint8_t cur_subframe; ///< current subframe number yading@10: uint16_t decoded_samples; ///< number of already processed samples yading@10: uint8_t grouped; ///< channel is part of a group yading@10: int quant_step; ///< quantization step for the current subframe yading@10: int8_t reuse_sf; ///< share scale factors between subframes yading@10: int8_t scale_factor_step; ///< scaling step for the current subframe yading@10: int max_scale_factor; ///< maximum scale factor for the current subframe yading@10: int saved_scale_factors[2][MAX_BANDS]; ///< resampled and (previously) transmitted scale factor values yading@10: int8_t scale_factor_idx; ///< index for the transmitted scale factor values (used for resampling) yading@10: int* scale_factors; ///< pointer to the scale factor values used for decoding yading@10: uint8_t table_idx; ///< index in sf_offsets for the scale factor reference block yading@10: float* coeffs; ///< pointer to the subframe decode buffer yading@10: uint16_t num_vec_coeffs; ///< number of vector coded coefficients yading@10: DECLARE_ALIGNED(32, float, out)[WMAPRO_BLOCK_MAX_SIZE + WMAPRO_BLOCK_MAX_SIZE / 2]; ///< output buffer yading@10: } WMAProChannelCtx; yading@10: yading@10: /** yading@10: * @brief channel group for channel transformations yading@10: */ yading@10: typedef struct { yading@10: uint8_t num_channels; ///< number of channels in the group yading@10: int8_t transform; ///< transform on / off yading@10: int8_t transform_band[MAX_BANDS]; ///< controls if the transform is enabled for a certain band yading@10: float decorrelation_matrix[WMAPRO_MAX_CHANNELS*WMAPRO_MAX_CHANNELS]; yading@10: float* channel_data[WMAPRO_MAX_CHANNELS]; ///< transformation coefficients yading@10: } WMAProChannelGrp; yading@10: yading@10: /** yading@10: * @brief main decoder context yading@10: */ yading@10: typedef struct WMAProDecodeCtx { yading@10: /* generic decoder variables */ yading@10: AVCodecContext* avctx; ///< codec context for av_log yading@10: AVFloatDSPContext fdsp; yading@10: uint8_t frame_data[MAX_FRAMESIZE + yading@10: FF_INPUT_BUFFER_PADDING_SIZE];///< compressed frame data yading@10: PutBitContext pb; ///< context for filling the frame_data buffer yading@10: FFTContext mdct_ctx[WMAPRO_BLOCK_SIZES]; ///< MDCT context per block size yading@10: DECLARE_ALIGNED(32, float, tmp)[WMAPRO_BLOCK_MAX_SIZE]; ///< IMDCT output buffer yading@10: float* windows[WMAPRO_BLOCK_SIZES]; ///< windows for the different block sizes yading@10: yading@10: /* frame size dependent frame information (set during initialization) */ yading@10: uint32_t decode_flags; ///< used compression features yading@10: uint8_t len_prefix; ///< frame is prefixed with its length yading@10: uint8_t dynamic_range_compression; ///< frame contains DRC data yading@10: uint8_t bits_per_sample; ///< integer audio sample size for the unscaled IMDCT output (used to scale to [-1.0, 1.0]) yading@10: uint16_t samples_per_frame; ///< number of samples to output yading@10: uint16_t log2_frame_size; yading@10: int8_t lfe_channel; ///< lfe channel index yading@10: uint8_t max_num_subframes; yading@10: uint8_t subframe_len_bits; ///< number of bits used for the subframe length yading@10: uint8_t max_subframe_len_bit; ///< flag indicating that the subframe is of maximum size when the first subframe length bit is 1 yading@10: uint16_t min_samples_per_subframe; yading@10: int8_t num_sfb[WMAPRO_BLOCK_SIZES]; ///< scale factor bands per block size yading@10: int16_t sfb_offsets[WMAPRO_BLOCK_SIZES][MAX_BANDS]; ///< scale factor band offsets (multiples of 4) yading@10: int8_t sf_offsets[WMAPRO_BLOCK_SIZES][WMAPRO_BLOCK_SIZES][MAX_BANDS]; ///< scale factor resample matrix yading@10: int16_t subwoofer_cutoffs[WMAPRO_BLOCK_SIZES]; ///< subwoofer cutoff values yading@10: yading@10: /* packet decode state */ yading@10: GetBitContext pgb; ///< bitstream reader context for the packet yading@10: int next_packet_start; ///< start offset of the next wma packet in the demuxer packet yading@10: uint8_t packet_offset; ///< frame offset in the packet yading@10: uint8_t packet_sequence_number; ///< current packet number yading@10: int num_saved_bits; ///< saved number of bits yading@10: int frame_offset; ///< frame offset in the bit reservoir yading@10: int subframe_offset; ///< subframe offset in the bit reservoir yading@10: uint8_t packet_loss; ///< set in case of bitstream error yading@10: uint8_t packet_done; ///< set when a packet is fully decoded yading@10: yading@10: /* frame decode state */ yading@10: uint32_t frame_num; ///< current frame number (not used for decoding) yading@10: GetBitContext gb; ///< bitstream reader context yading@10: int buf_bit_size; ///< buffer size in bits yading@10: uint8_t drc_gain; ///< gain for the DRC tool yading@10: int8_t skip_frame; ///< skip output step yading@10: int8_t parsed_all_subframes; ///< all subframes decoded? yading@10: yading@10: /* subframe/block decode state */ yading@10: int16_t subframe_len; ///< current subframe length yading@10: int8_t channels_for_cur_subframe; ///< number of channels that contain the subframe yading@10: int8_t channel_indexes_for_cur_subframe[WMAPRO_MAX_CHANNELS]; yading@10: int8_t num_bands; ///< number of scale factor bands yading@10: int8_t transmit_num_vec_coeffs; ///< number of vector coded coefficients is part of the bitstream yading@10: int16_t* cur_sfb_offsets; ///< sfb offsets for the current block yading@10: uint8_t table_idx; ///< index for the num_sfb, sfb_offsets, sf_offsets and subwoofer_cutoffs tables yading@10: int8_t esc_len; ///< length of escaped coefficients yading@10: yading@10: uint8_t num_chgroups; ///< number of channel groups yading@10: WMAProChannelGrp chgroup[WMAPRO_MAX_CHANNELS]; ///< channel group information yading@10: yading@10: WMAProChannelCtx channel[WMAPRO_MAX_CHANNELS]; ///< per channel data yading@10: } WMAProDecodeCtx; yading@10: yading@10: yading@10: /** yading@10: *@brief helper function to print the most important members of the context yading@10: *@param s context yading@10: */ yading@10: static av_cold void dump_context(WMAProDecodeCtx *s) yading@10: { yading@10: #define PRINT(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %d\n", a, b); yading@10: #define PRINT_HEX(a, b) av_log(s->avctx, AV_LOG_DEBUG, " %s = %x\n", a, b); yading@10: yading@10: PRINT("ed sample bit depth", s->bits_per_sample); yading@10: PRINT_HEX("ed decode flags", s->decode_flags); yading@10: PRINT("samples per frame", s->samples_per_frame); yading@10: PRINT("log2 frame size", s->log2_frame_size); yading@10: PRINT("max num subframes", s->max_num_subframes); yading@10: PRINT("len prefix", s->len_prefix); yading@10: PRINT("num channels", s->avctx->channels); yading@10: } yading@10: yading@10: /** yading@10: *@brief Uninitialize the decoder and free all resources. yading@10: *@param avctx codec context yading@10: *@return 0 on success, < 0 otherwise yading@10: */ yading@10: static av_cold int decode_end(AVCodecContext *avctx) yading@10: { yading@10: WMAProDecodeCtx *s = avctx->priv_data; yading@10: int i; yading@10: yading@10: for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) yading@10: ff_mdct_end(&s->mdct_ctx[i]); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: *@brief Initialize the decoder. yading@10: *@param avctx codec context yading@10: *@return 0 on success, -1 otherwise yading@10: */ yading@10: static av_cold int decode_init(AVCodecContext *avctx) yading@10: { yading@10: WMAProDecodeCtx *s = avctx->priv_data; yading@10: uint8_t *edata_ptr = avctx->extradata; yading@10: unsigned int channel_mask; yading@10: int i, bits; yading@10: int log2_max_num_subframes; yading@10: int num_possible_block_sizes; yading@10: yading@10: if (!avctx->block_align) { yading@10: av_log(avctx, AV_LOG_ERROR, "block_align is not set\n"); yading@10: return AVERROR(EINVAL); yading@10: } yading@10: yading@10: s->avctx = avctx; yading@10: avpriv_float_dsp_init(&s->fdsp, avctx->flags & CODEC_FLAG_BITEXACT); yading@10: yading@10: init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE); yading@10: yading@10: avctx->sample_fmt = AV_SAMPLE_FMT_FLTP; yading@10: yading@10: if (avctx->extradata_size >= 18) { yading@10: s->decode_flags = AV_RL16(edata_ptr+14); yading@10: channel_mask = AV_RL32(edata_ptr+2); yading@10: s->bits_per_sample = AV_RL16(edata_ptr); yading@10: /** dump the extradata */ yading@10: for (i = 0; i < avctx->extradata_size; i++) yading@10: av_dlog(avctx, "[%x] ", avctx->extradata[i]); yading@10: av_dlog(avctx, "\n"); yading@10: yading@10: } else { yading@10: avpriv_request_sample(avctx, "Unknown extradata size"); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: yading@10: /** generic init */ yading@10: s->log2_frame_size = av_log2(avctx->block_align) + 4; yading@10: yading@10: /** frame info */ yading@10: s->skip_frame = 1; /* skip first frame */ yading@10: s->packet_loss = 1; yading@10: s->len_prefix = (s->decode_flags & 0x40); yading@10: yading@10: /** get frame len */ yading@10: bits = ff_wma_get_frame_len_bits(avctx->sample_rate, 3, s->decode_flags); yading@10: if (bits > WMAPRO_BLOCK_MAX_BITS) { yading@10: avpriv_request_sample(avctx, "14-bit block sizes"); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: s->samples_per_frame = 1 << bits; yading@10: yading@10: /** subframe info */ yading@10: log2_max_num_subframes = ((s->decode_flags & 0x38) >> 3); yading@10: s->max_num_subframes = 1 << log2_max_num_subframes; yading@10: if (s->max_num_subframes == 16 || s->max_num_subframes == 4) yading@10: s->max_subframe_len_bit = 1; yading@10: s->subframe_len_bits = av_log2(log2_max_num_subframes) + 1; yading@10: yading@10: num_possible_block_sizes = log2_max_num_subframes + 1; yading@10: s->min_samples_per_subframe = s->samples_per_frame / s->max_num_subframes; yading@10: s->dynamic_range_compression = (s->decode_flags & 0x80); yading@10: yading@10: if (s->max_num_subframes > MAX_SUBFRAMES) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid number of subframes %i\n", yading@10: s->max_num_subframes); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (s->min_samples_per_subframe < (1<min_samples_per_subframe); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (s->avctx->sample_rate <= 0) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid sample rate\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (avctx->channels < 0) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid number of channels %d\n", yading@10: avctx->channels); yading@10: return AVERROR_INVALIDDATA; yading@10: } else if (avctx->channels > WMAPRO_MAX_CHANNELS) { yading@10: avpriv_request_sample(avctx, yading@10: "More than %d channels", WMAPRO_MAX_CHANNELS); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: yading@10: /** init previous block len */ yading@10: for (i = 0; i < avctx->channels; i++) yading@10: s->channel[i].prev_block_len = s->samples_per_frame; yading@10: yading@10: /** extract lfe channel position */ yading@10: s->lfe_channel = -1; yading@10: yading@10: if (channel_mask & 8) { yading@10: unsigned int mask; yading@10: for (mask = 1; mask < 16; mask <<= 1) { yading@10: if (channel_mask & mask) yading@10: ++s->lfe_channel; yading@10: } yading@10: } yading@10: yading@10: INIT_VLC_STATIC(&sf_vlc, SCALEVLCBITS, HUFF_SCALE_SIZE, yading@10: scale_huffbits, 1, 1, yading@10: scale_huffcodes, 2, 2, 616); yading@10: yading@10: INIT_VLC_STATIC(&sf_rl_vlc, VLCBITS, HUFF_SCALE_RL_SIZE, yading@10: scale_rl_huffbits, 1, 1, yading@10: scale_rl_huffcodes, 4, 4, 1406); yading@10: yading@10: INIT_VLC_STATIC(&coef_vlc[0], VLCBITS, HUFF_COEF0_SIZE, yading@10: coef0_huffbits, 1, 1, yading@10: coef0_huffcodes, 4, 4, 2108); yading@10: yading@10: INIT_VLC_STATIC(&coef_vlc[1], VLCBITS, HUFF_COEF1_SIZE, yading@10: coef1_huffbits, 1, 1, yading@10: coef1_huffcodes, 4, 4, 3912); yading@10: yading@10: INIT_VLC_STATIC(&vec4_vlc, VLCBITS, HUFF_VEC4_SIZE, yading@10: vec4_huffbits, 1, 1, yading@10: vec4_huffcodes, 2, 2, 604); yading@10: yading@10: INIT_VLC_STATIC(&vec2_vlc, VLCBITS, HUFF_VEC2_SIZE, yading@10: vec2_huffbits, 1, 1, yading@10: vec2_huffcodes, 2, 2, 562); yading@10: yading@10: INIT_VLC_STATIC(&vec1_vlc, VLCBITS, HUFF_VEC1_SIZE, yading@10: vec1_huffbits, 1, 1, yading@10: vec1_huffcodes, 2, 2, 562); yading@10: yading@10: /** calculate number of scale factor bands and their offsets yading@10: for every possible block size */ yading@10: for (i = 0; i < num_possible_block_sizes; i++) { yading@10: int subframe_len = s->samples_per_frame >> i; yading@10: int x; yading@10: int band = 1; yading@10: yading@10: s->sfb_offsets[i][0] = 0; yading@10: yading@10: for (x = 0; x < MAX_BANDS-1 && s->sfb_offsets[i][band - 1] < subframe_len; x++) { yading@10: int offset = (subframe_len * 2 * critical_freq[x]) yading@10: / s->avctx->sample_rate + 2; yading@10: offset &= ~3; yading@10: if (offset > s->sfb_offsets[i][band - 1]) yading@10: s->sfb_offsets[i][band++] = offset; yading@10: } yading@10: s->sfb_offsets[i][band - 1] = subframe_len; yading@10: s->num_sfb[i] = band - 1; yading@10: if (s->num_sfb[i] <= 0) { yading@10: av_log(avctx, AV_LOG_ERROR, "num_sfb invalid\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: } yading@10: yading@10: yading@10: /** Scale factors can be shared between blocks of different size yading@10: as every block has a different scale factor band layout. yading@10: The matrix sf_offsets is needed to find the correct scale factor. yading@10: */ yading@10: yading@10: for (i = 0; i < num_possible_block_sizes; i++) { yading@10: int b; yading@10: for (b = 0; b < s->num_sfb[i]; b++) { yading@10: int x; yading@10: int offset = ((s->sfb_offsets[i][b] yading@10: + s->sfb_offsets[i][b + 1] - 1) << i) >> 1; yading@10: for (x = 0; x < num_possible_block_sizes; x++) { yading@10: int v = 0; yading@10: while (s->sfb_offsets[x][v + 1] << x < offset) yading@10: ++v; yading@10: s->sf_offsets[i][x][b] = v; yading@10: } yading@10: } yading@10: } yading@10: yading@10: /** init MDCT, FIXME: only init needed sizes */ yading@10: for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) yading@10: ff_mdct_init(&s->mdct_ctx[i], WMAPRO_BLOCK_MIN_BITS+1+i, 1, yading@10: 1.0 / (1 << (WMAPRO_BLOCK_MIN_BITS + i - 1)) yading@10: / (1 << (s->bits_per_sample - 1))); yading@10: yading@10: /** init MDCT windows: simple sinus window */ yading@10: for (i = 0; i < WMAPRO_BLOCK_SIZES; i++) { yading@10: const int win_idx = WMAPRO_BLOCK_MAX_BITS - i; yading@10: ff_init_ff_sine_windows(win_idx); yading@10: s->windows[WMAPRO_BLOCK_SIZES - i - 1] = ff_sine_windows[win_idx]; yading@10: } yading@10: yading@10: /** calculate subwoofer cutoff values */ yading@10: for (i = 0; i < num_possible_block_sizes; i++) { yading@10: int block_size = s->samples_per_frame >> i; yading@10: int cutoff = (440*block_size + 3 * (s->avctx->sample_rate >> 1) - 1) yading@10: / s->avctx->sample_rate; yading@10: s->subwoofer_cutoffs[i] = av_clip(cutoff, 4, block_size); yading@10: } yading@10: yading@10: /** calculate sine values for the decorrelation matrix */ yading@10: for (i = 0; i < 33; i++) yading@10: sin64[i] = sin(i*M_PI / 64.0); yading@10: yading@10: if (avctx->debug & FF_DEBUG_BITSTREAM) yading@10: dump_context(s); yading@10: yading@10: avctx->channel_layout = channel_mask; yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: *@brief Decode the subframe length. yading@10: *@param s context yading@10: *@param offset sample offset in the frame yading@10: *@return decoded subframe length on success, < 0 in case of an error yading@10: */ yading@10: static int decode_subframe_length(WMAProDecodeCtx *s, int offset) yading@10: { yading@10: int frame_len_shift = 0; yading@10: int subframe_len; yading@10: yading@10: /** no need to read from the bitstream when only one length is possible */ yading@10: if (offset == s->samples_per_frame - s->min_samples_per_subframe) yading@10: return s->min_samples_per_subframe; yading@10: yading@10: /** 1 bit indicates if the subframe is of maximum length */ yading@10: if (s->max_subframe_len_bit) { yading@10: if (get_bits1(&s->gb)) yading@10: frame_len_shift = 1 + get_bits(&s->gb, s->subframe_len_bits-1); yading@10: } else yading@10: frame_len_shift = get_bits(&s->gb, s->subframe_len_bits); yading@10: yading@10: subframe_len = s->samples_per_frame >> frame_len_shift; yading@10: yading@10: /** sanity check the length */ yading@10: if (subframe_len < s->min_samples_per_subframe || yading@10: subframe_len > s->samples_per_frame) { yading@10: av_log(s->avctx, AV_LOG_ERROR, "broken frame: subframe_len %i\n", yading@10: subframe_len); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: return subframe_len; yading@10: } yading@10: yading@10: /** yading@10: *@brief Decode how the data in the frame is split into subframes. yading@10: * Every WMA frame contains the encoded data for a fixed number of yading@10: * samples per channel. The data for every channel might be split yading@10: * into several subframes. This function will reconstruct the list of yading@10: * subframes for every channel. yading@10: * yading@10: * If the subframes are not evenly split, the algorithm estimates the yading@10: * channels with the lowest number of total samples. yading@10: * Afterwards, for each of these channels a bit is read from the yading@10: * bitstream that indicates if the channel contains a subframe with the yading@10: * next subframe size that is going to be read from the bitstream or not. yading@10: * If a channel contains such a subframe, the subframe size gets added to yading@10: * the channel's subframe list. yading@10: * The algorithm repeats these steps until the frame is properly divided yading@10: * between the individual channels. yading@10: * yading@10: *@param s context yading@10: *@return 0 on success, < 0 in case of an error yading@10: */ yading@10: static int decode_tilehdr(WMAProDecodeCtx *s) yading@10: { yading@10: uint16_t num_samples[WMAPRO_MAX_CHANNELS] = { 0 };/**< sum of samples for all currently known subframes of a channel */ yading@10: uint8_t contains_subframe[WMAPRO_MAX_CHANNELS]; /**< flag indicating if a channel contains the current subframe */ yading@10: int channels_for_cur_subframe = s->avctx->channels; /**< number of channels that contain the current subframe */ yading@10: int fixed_channel_layout = 0; /**< flag indicating that all channels use the same subframe offsets and sizes */ yading@10: int min_channel_len = 0; /**< smallest sum of samples (channels with this length will be processed first) */ yading@10: int c; yading@10: yading@10: /* Should never consume more than 3073 bits (256 iterations for the yading@10: * while loop when always the minimum amount of 128 samples is subtracted yading@10: * from missing samples in the 8 channel case). yading@10: * 1 + BLOCK_MAX_SIZE * MAX_CHANNELS / BLOCK_MIN_SIZE * (MAX_CHANNELS + 4) yading@10: */ yading@10: yading@10: /** reset tiling information */ yading@10: for (c = 0; c < s->avctx->channels; c++) yading@10: s->channel[c].num_subframes = 0; yading@10: yading@10: if (s->max_num_subframes == 1 || get_bits1(&s->gb)) yading@10: fixed_channel_layout = 1; yading@10: yading@10: /** loop until the frame data is split between the subframes */ yading@10: do { yading@10: int subframe_len; yading@10: yading@10: /** check which channels contain the subframe */ yading@10: for (c = 0; c < s->avctx->channels; c++) { yading@10: if (num_samples[c] == min_channel_len) { yading@10: if (fixed_channel_layout || channels_for_cur_subframe == 1 || yading@10: (min_channel_len == s->samples_per_frame - s->min_samples_per_subframe)) yading@10: contains_subframe[c] = 1; yading@10: else yading@10: contains_subframe[c] = get_bits1(&s->gb); yading@10: } else yading@10: contains_subframe[c] = 0; yading@10: } yading@10: yading@10: /** get subframe length, subframe_len == 0 is not allowed */ yading@10: if ((subframe_len = decode_subframe_length(s, min_channel_len)) <= 0) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: /** add subframes to the individual channels and find new min_channel_len */ yading@10: min_channel_len += subframe_len; yading@10: for (c = 0; c < s->avctx->channels; c++) { yading@10: WMAProChannelCtx* chan = &s->channel[c]; yading@10: yading@10: if (contains_subframe[c]) { yading@10: if (chan->num_subframes >= MAX_SUBFRAMES) { yading@10: av_log(s->avctx, AV_LOG_ERROR, yading@10: "broken frame: num subframes > 31\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: chan->subframe_len[chan->num_subframes] = subframe_len; yading@10: num_samples[c] += subframe_len; yading@10: ++chan->num_subframes; yading@10: if (num_samples[c] > s->samples_per_frame) { yading@10: av_log(s->avctx, AV_LOG_ERROR, "broken frame: " yading@10: "channel len > samples_per_frame\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: } else if (num_samples[c] <= min_channel_len) { yading@10: if (num_samples[c] < min_channel_len) { yading@10: channels_for_cur_subframe = 0; yading@10: min_channel_len = num_samples[c]; yading@10: } yading@10: ++channels_for_cur_subframe; yading@10: } yading@10: } yading@10: } while (min_channel_len < s->samples_per_frame); yading@10: yading@10: for (c = 0; c < s->avctx->channels; c++) { yading@10: int i; yading@10: int offset = 0; yading@10: for (i = 0; i < s->channel[c].num_subframes; i++) { yading@10: av_dlog(s->avctx, "frame[%i] channel[%i] subframe[%i]" yading@10: " len %i\n", s->frame_num, c, i, yading@10: s->channel[c].subframe_len[i]); yading@10: s->channel[c].subframe_offset[i] = offset; yading@10: offset += s->channel[c].subframe_len[i]; yading@10: } yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: *@brief Calculate a decorrelation matrix from the bitstream parameters. yading@10: *@param s codec context yading@10: *@param chgroup channel group for which the matrix needs to be calculated yading@10: */ yading@10: static void decode_decorrelation_matrix(WMAProDecodeCtx *s, yading@10: WMAProChannelGrp *chgroup) yading@10: { yading@10: int i; yading@10: int offset = 0; yading@10: int8_t rotation_offset[WMAPRO_MAX_CHANNELS * WMAPRO_MAX_CHANNELS]; yading@10: memset(chgroup->decorrelation_matrix, 0, s->avctx->channels * yading@10: s->avctx->channels * sizeof(*chgroup->decorrelation_matrix)); yading@10: yading@10: for (i = 0; i < chgroup->num_channels * (chgroup->num_channels - 1) >> 1; i++) yading@10: rotation_offset[i] = get_bits(&s->gb, 6); yading@10: yading@10: for (i = 0; i < chgroup->num_channels; i++) yading@10: chgroup->decorrelation_matrix[chgroup->num_channels * i + i] = yading@10: get_bits1(&s->gb) ? 1.0 : -1.0; yading@10: yading@10: for (i = 1; i < chgroup->num_channels; i++) { yading@10: int x; yading@10: for (x = 0; x < i; x++) { yading@10: int y; yading@10: for (y = 0; y < i + 1; y++) { yading@10: float v1 = chgroup->decorrelation_matrix[x * chgroup->num_channels + y]; yading@10: float v2 = chgroup->decorrelation_matrix[i * chgroup->num_channels + y]; yading@10: int n = rotation_offset[offset + x]; yading@10: float sinv; yading@10: float cosv; yading@10: yading@10: if (n < 32) { yading@10: sinv = sin64[n]; yading@10: cosv = sin64[32 - n]; yading@10: } else { yading@10: sinv = sin64[64 - n]; yading@10: cosv = -sin64[n - 32]; yading@10: } yading@10: yading@10: chgroup->decorrelation_matrix[y + x * chgroup->num_channels] = yading@10: (v1 * sinv) - (v2 * cosv); yading@10: chgroup->decorrelation_matrix[y + i * chgroup->num_channels] = yading@10: (v1 * cosv) + (v2 * sinv); yading@10: } yading@10: } yading@10: offset += i; yading@10: } yading@10: } yading@10: yading@10: /** yading@10: *@brief Decode channel transformation parameters yading@10: *@param s codec context yading@10: *@return 0 in case of success, < 0 in case of bitstream errors yading@10: */ yading@10: static int decode_channel_transform(WMAProDecodeCtx* s) yading@10: { yading@10: int i; yading@10: /* should never consume more than 1921 bits for the 8 channel case yading@10: * 1 + MAX_CHANNELS * (MAX_CHANNELS + 2 + 3 * MAX_CHANNELS * MAX_CHANNELS yading@10: * + MAX_CHANNELS + MAX_BANDS + 1) yading@10: */ yading@10: yading@10: /** in the one channel case channel transforms are pointless */ yading@10: s->num_chgroups = 0; yading@10: if (s->avctx->channels > 1) { yading@10: int remaining_channels = s->channels_for_cur_subframe; yading@10: yading@10: if (get_bits1(&s->gb)) { yading@10: avpriv_request_sample(s->avctx, yading@10: "Channel transform bit"); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: yading@10: for (s->num_chgroups = 0; remaining_channels && yading@10: s->num_chgroups < s->channels_for_cur_subframe; s->num_chgroups++) { yading@10: WMAProChannelGrp* chgroup = &s->chgroup[s->num_chgroups]; yading@10: float** channel_data = chgroup->channel_data; yading@10: chgroup->num_channels = 0; yading@10: chgroup->transform = 0; yading@10: yading@10: /** decode channel mask */ yading@10: if (remaining_channels > 2) { yading@10: for (i = 0; i < s->channels_for_cur_subframe; i++) { yading@10: int channel_idx = s->channel_indexes_for_cur_subframe[i]; yading@10: if (!s->channel[channel_idx].grouped yading@10: && get_bits1(&s->gb)) { yading@10: ++chgroup->num_channels; yading@10: s->channel[channel_idx].grouped = 1; yading@10: *channel_data++ = s->channel[channel_idx].coeffs; yading@10: } yading@10: } yading@10: } else { yading@10: chgroup->num_channels = remaining_channels; yading@10: for (i = 0; i < s->channels_for_cur_subframe; i++) { yading@10: int channel_idx = s->channel_indexes_for_cur_subframe[i]; yading@10: if (!s->channel[channel_idx].grouped) yading@10: *channel_data++ = s->channel[channel_idx].coeffs; yading@10: s->channel[channel_idx].grouped = 1; yading@10: } yading@10: } yading@10: yading@10: /** decode transform type */ yading@10: if (chgroup->num_channels == 2) { yading@10: if (get_bits1(&s->gb)) { yading@10: if (get_bits1(&s->gb)) { yading@10: avpriv_request_sample(s->avctx, yading@10: "Unknown channel transform type"); yading@10: } yading@10: } else { yading@10: chgroup->transform = 1; yading@10: if (s->avctx->channels == 2) { yading@10: chgroup->decorrelation_matrix[0] = 1.0; yading@10: chgroup->decorrelation_matrix[1] = -1.0; yading@10: chgroup->decorrelation_matrix[2] = 1.0; yading@10: chgroup->decorrelation_matrix[3] = 1.0; yading@10: } else { yading@10: /** cos(pi/4) */ yading@10: chgroup->decorrelation_matrix[0] = 0.70703125; yading@10: chgroup->decorrelation_matrix[1] = -0.70703125; yading@10: chgroup->decorrelation_matrix[2] = 0.70703125; yading@10: chgroup->decorrelation_matrix[3] = 0.70703125; yading@10: } yading@10: } yading@10: } else if (chgroup->num_channels > 2) { yading@10: if (get_bits1(&s->gb)) { yading@10: chgroup->transform = 1; yading@10: if (get_bits1(&s->gb)) { yading@10: decode_decorrelation_matrix(s, chgroup); yading@10: } else { yading@10: /** FIXME: more than 6 coupled channels not supported */ yading@10: if (chgroup->num_channels > 6) { yading@10: avpriv_request_sample(s->avctx, yading@10: "Coupled channels > 6"); yading@10: } else { yading@10: memcpy(chgroup->decorrelation_matrix, yading@10: default_decorrelation[chgroup->num_channels], yading@10: chgroup->num_channels * chgroup->num_channels * yading@10: sizeof(*chgroup->decorrelation_matrix)); yading@10: } yading@10: } yading@10: } yading@10: } yading@10: yading@10: /** decode transform on / off */ yading@10: if (chgroup->transform) { yading@10: if (!get_bits1(&s->gb)) { yading@10: int i; yading@10: /** transform can be enabled for individual bands */ yading@10: for (i = 0; i < s->num_bands; i++) { yading@10: chgroup->transform_band[i] = get_bits1(&s->gb); yading@10: } yading@10: } else { yading@10: memset(chgroup->transform_band, 1, s->num_bands); yading@10: } yading@10: } yading@10: remaining_channels -= chgroup->num_channels; yading@10: } yading@10: } yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: *@brief Extract the coefficients from the bitstream. yading@10: *@param s codec context yading@10: *@param c current channel number yading@10: *@return 0 on success, < 0 in case of bitstream errors yading@10: */ yading@10: static int decode_coeffs(WMAProDecodeCtx *s, int c) yading@10: { yading@10: /* Integers 0..15 as single-precision floats. The table saves a yading@10: costly int to float conversion, and storing the values as yading@10: integers allows fast sign-flipping. */ yading@10: static const uint32_t fval_tab[16] = { yading@10: 0x00000000, 0x3f800000, 0x40000000, 0x40400000, yading@10: 0x40800000, 0x40a00000, 0x40c00000, 0x40e00000, yading@10: 0x41000000, 0x41100000, 0x41200000, 0x41300000, yading@10: 0x41400000, 0x41500000, 0x41600000, 0x41700000, yading@10: }; yading@10: int vlctable; yading@10: VLC* vlc; yading@10: WMAProChannelCtx* ci = &s->channel[c]; yading@10: int rl_mode = 0; yading@10: int cur_coeff = 0; yading@10: int num_zeros = 0; yading@10: const uint16_t* run; yading@10: const float* level; yading@10: yading@10: av_dlog(s->avctx, "decode coefficients for channel %i\n", c); yading@10: yading@10: vlctable = get_bits1(&s->gb); yading@10: vlc = &coef_vlc[vlctable]; yading@10: yading@10: if (vlctable) { yading@10: run = coef1_run; yading@10: level = coef1_level; yading@10: } else { yading@10: run = coef0_run; yading@10: level = coef0_level; yading@10: } yading@10: yading@10: /** decode vector coefficients (consumes up to 167 bits per iteration for yading@10: 4 vector coded large values) */ yading@10: while ((s->transmit_num_vec_coeffs || !rl_mode) && yading@10: (cur_coeff + 3 < ci->num_vec_coeffs)) { yading@10: uint32_t vals[4]; yading@10: int i; yading@10: unsigned int idx; yading@10: yading@10: idx = get_vlc2(&s->gb, vec4_vlc.table, VLCBITS, VEC4MAXDEPTH); yading@10: yading@10: if (idx == HUFF_VEC4_SIZE - 1) { yading@10: for (i = 0; i < 4; i += 2) { yading@10: idx = get_vlc2(&s->gb, vec2_vlc.table, VLCBITS, VEC2MAXDEPTH); yading@10: if (idx == HUFF_VEC2_SIZE - 1) { yading@10: uint32_t v0, v1; yading@10: v0 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH); yading@10: if (v0 == HUFF_VEC1_SIZE - 1) yading@10: v0 += ff_wma_get_large_val(&s->gb); yading@10: v1 = get_vlc2(&s->gb, vec1_vlc.table, VLCBITS, VEC1MAXDEPTH); yading@10: if (v1 == HUFF_VEC1_SIZE - 1) yading@10: v1 += ff_wma_get_large_val(&s->gb); yading@10: vals[i ] = av_float2int(v0); yading@10: vals[i+1] = av_float2int(v1); yading@10: } else { yading@10: vals[i] = fval_tab[symbol_to_vec2[idx] >> 4 ]; yading@10: vals[i+1] = fval_tab[symbol_to_vec2[idx] & 0xF]; yading@10: } yading@10: } yading@10: } else { yading@10: vals[0] = fval_tab[ symbol_to_vec4[idx] >> 12 ]; yading@10: vals[1] = fval_tab[(symbol_to_vec4[idx] >> 8) & 0xF]; yading@10: vals[2] = fval_tab[(symbol_to_vec4[idx] >> 4) & 0xF]; yading@10: vals[3] = fval_tab[ symbol_to_vec4[idx] & 0xF]; yading@10: } yading@10: yading@10: /** decode sign */ yading@10: for (i = 0; i < 4; i++) { yading@10: if (vals[i]) { yading@10: uint32_t sign = get_bits1(&s->gb) - 1; yading@10: AV_WN32A(&ci->coeffs[cur_coeff], vals[i] ^ sign << 31); yading@10: num_zeros = 0; yading@10: } else { yading@10: ci->coeffs[cur_coeff] = 0; yading@10: /** switch to run level mode when subframe_len / 128 zeros yading@10: were found in a row */ yading@10: rl_mode |= (++num_zeros > s->subframe_len >> 8); yading@10: } yading@10: ++cur_coeff; yading@10: } yading@10: } yading@10: yading@10: /** decode run level coded coefficients */ yading@10: if (cur_coeff < s->subframe_len) { yading@10: memset(&ci->coeffs[cur_coeff], 0, yading@10: sizeof(*ci->coeffs) * (s->subframe_len - cur_coeff)); yading@10: if (ff_wma_run_level_decode(s->avctx, &s->gb, vlc, yading@10: level, run, 1, ci->coeffs, yading@10: cur_coeff, s->subframe_len, yading@10: s->subframe_len, s->esc_len, 0)) yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: *@brief Extract scale factors from the bitstream. yading@10: *@param s codec context yading@10: *@return 0 on success, < 0 in case of bitstream errors yading@10: */ yading@10: static int decode_scale_factors(WMAProDecodeCtx* s) yading@10: { yading@10: int i; yading@10: yading@10: /** should never consume more than 5344 bits yading@10: * MAX_CHANNELS * (1 + MAX_BANDS * 23) yading@10: */ yading@10: yading@10: for (i = 0; i < s->channels_for_cur_subframe; i++) { yading@10: int c = s->channel_indexes_for_cur_subframe[i]; yading@10: int* sf; yading@10: int* sf_end; yading@10: s->channel[c].scale_factors = s->channel[c].saved_scale_factors[!s->channel[c].scale_factor_idx]; yading@10: sf_end = s->channel[c].scale_factors + s->num_bands; yading@10: yading@10: /** resample scale factors for the new block size yading@10: * as the scale factors might need to be resampled several times yading@10: * before some new values are transmitted, a backup of the last yading@10: * transmitted scale factors is kept in saved_scale_factors yading@10: */ yading@10: if (s->channel[c].reuse_sf) { yading@10: const int8_t* sf_offsets = s->sf_offsets[s->table_idx][s->channel[c].table_idx]; yading@10: int b; yading@10: for (b = 0; b < s->num_bands; b++) yading@10: s->channel[c].scale_factors[b] = yading@10: s->channel[c].saved_scale_factors[s->channel[c].scale_factor_idx][*sf_offsets++]; yading@10: } yading@10: yading@10: if (!s->channel[c].cur_subframe || get_bits1(&s->gb)) { yading@10: yading@10: if (!s->channel[c].reuse_sf) { yading@10: int val; yading@10: /** decode DPCM coded scale factors */ yading@10: s->channel[c].scale_factor_step = get_bits(&s->gb, 2) + 1; yading@10: val = 45 / s->channel[c].scale_factor_step; yading@10: for (sf = s->channel[c].scale_factors; sf < sf_end; sf++) { yading@10: val += get_vlc2(&s->gb, sf_vlc.table, SCALEVLCBITS, SCALEMAXDEPTH) - 60; yading@10: *sf = val; yading@10: } yading@10: } else { yading@10: int i; yading@10: /** run level decode differences to the resampled factors */ yading@10: for (i = 0; i < s->num_bands; i++) { yading@10: int idx; yading@10: int skip; yading@10: int val; yading@10: int sign; yading@10: yading@10: idx = get_vlc2(&s->gb, sf_rl_vlc.table, VLCBITS, SCALERLMAXDEPTH); yading@10: yading@10: if (!idx) { yading@10: uint32_t code = get_bits(&s->gb, 14); yading@10: val = code >> 6; yading@10: sign = (code & 1) - 1; yading@10: skip = (code & 0x3f) >> 1; yading@10: } else if (idx == 1) { yading@10: break; yading@10: } else { yading@10: skip = scale_rl_run[idx]; yading@10: val = scale_rl_level[idx]; yading@10: sign = get_bits1(&s->gb)-1; yading@10: } yading@10: yading@10: i += skip; yading@10: if (i >= s->num_bands) { yading@10: av_log(s->avctx, AV_LOG_ERROR, yading@10: "invalid scale factor coding\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: s->channel[c].scale_factors[i] += (val ^ sign) - sign; yading@10: } yading@10: } yading@10: /** swap buffers */ yading@10: s->channel[c].scale_factor_idx = !s->channel[c].scale_factor_idx; yading@10: s->channel[c].table_idx = s->table_idx; yading@10: s->channel[c].reuse_sf = 1; yading@10: } yading@10: yading@10: /** calculate new scale factor maximum */ yading@10: s->channel[c].max_scale_factor = s->channel[c].scale_factors[0]; yading@10: for (sf = s->channel[c].scale_factors + 1; sf < sf_end; sf++) { yading@10: s->channel[c].max_scale_factor = yading@10: FFMAX(s->channel[c].max_scale_factor, *sf); yading@10: } yading@10: yading@10: } yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: *@brief Reconstruct the individual channel data. yading@10: *@param s codec context yading@10: */ yading@10: static void inverse_channel_transform(WMAProDecodeCtx *s) yading@10: { yading@10: int i; yading@10: yading@10: for (i = 0; i < s->num_chgroups; i++) { yading@10: if (s->chgroup[i].transform) { yading@10: float data[WMAPRO_MAX_CHANNELS]; yading@10: const int num_channels = s->chgroup[i].num_channels; yading@10: float** ch_data = s->chgroup[i].channel_data; yading@10: float** ch_end = ch_data + num_channels; yading@10: const int8_t* tb = s->chgroup[i].transform_band; yading@10: int16_t* sfb; yading@10: yading@10: /** multichannel decorrelation */ yading@10: for (sfb = s->cur_sfb_offsets; yading@10: sfb < s->cur_sfb_offsets + s->num_bands; sfb++) { yading@10: int y; yading@10: if (*tb++ == 1) { yading@10: /** multiply values with the decorrelation_matrix */ yading@10: for (y = sfb[0]; y < FFMIN(sfb[1], s->subframe_len); y++) { yading@10: const float* mat = s->chgroup[i].decorrelation_matrix; yading@10: const float* data_end = data + num_channels; yading@10: float* data_ptr = data; yading@10: float** ch; yading@10: yading@10: for (ch = ch_data; ch < ch_end; ch++) yading@10: *data_ptr++ = (*ch)[y]; yading@10: yading@10: for (ch = ch_data; ch < ch_end; ch++) { yading@10: float sum = 0; yading@10: data_ptr = data; yading@10: while (data_ptr < data_end) yading@10: sum += *data_ptr++ * *mat++; yading@10: yading@10: (*ch)[y] = sum; yading@10: } yading@10: } yading@10: } else if (s->avctx->channels == 2) { yading@10: int len = FFMIN(sfb[1], s->subframe_len) - sfb[0]; yading@10: s->fdsp.vector_fmul_scalar(ch_data[0] + sfb[0], yading@10: ch_data[0] + sfb[0], yading@10: 181.0 / 128, len); yading@10: s->fdsp.vector_fmul_scalar(ch_data[1] + sfb[0], yading@10: ch_data[1] + sfb[0], yading@10: 181.0 / 128, len); yading@10: } yading@10: } yading@10: } yading@10: } yading@10: } yading@10: yading@10: /** yading@10: *@brief Apply sine window and reconstruct the output buffer. yading@10: *@param s codec context yading@10: */ yading@10: static void wmapro_window(WMAProDecodeCtx *s) yading@10: { yading@10: int i; yading@10: for (i = 0; i < s->channels_for_cur_subframe; i++) { yading@10: int c = s->channel_indexes_for_cur_subframe[i]; yading@10: float* window; yading@10: int winlen = s->channel[c].prev_block_len; yading@10: float* start = s->channel[c].coeffs - (winlen >> 1); yading@10: yading@10: if (s->subframe_len < winlen) { yading@10: start += (winlen - s->subframe_len) >> 1; yading@10: winlen = s->subframe_len; yading@10: } yading@10: yading@10: window = s->windows[av_log2(winlen) - WMAPRO_BLOCK_MIN_BITS]; yading@10: yading@10: winlen >>= 1; yading@10: yading@10: s->fdsp.vector_fmul_window(start, start, start + winlen, yading@10: window, winlen); yading@10: yading@10: s->channel[c].prev_block_len = s->subframe_len; yading@10: } yading@10: } yading@10: yading@10: /** yading@10: *@brief Decode a single subframe (block). yading@10: *@param s codec context yading@10: *@return 0 on success, < 0 when decoding failed yading@10: */ yading@10: static int decode_subframe(WMAProDecodeCtx *s) yading@10: { yading@10: int offset = s->samples_per_frame; yading@10: int subframe_len = s->samples_per_frame; yading@10: int i; yading@10: int total_samples = s->samples_per_frame * s->avctx->channels; yading@10: int transmit_coeffs = 0; yading@10: int cur_subwoofer_cutoff; yading@10: yading@10: s->subframe_offset = get_bits_count(&s->gb); yading@10: yading@10: /** reset channel context and find the next block offset and size yading@10: == the next block of the channel with the smallest number of yading@10: decoded samples yading@10: */ yading@10: for (i = 0; i < s->avctx->channels; i++) { yading@10: s->channel[i].grouped = 0; yading@10: if (offset > s->channel[i].decoded_samples) { yading@10: offset = s->channel[i].decoded_samples; yading@10: subframe_len = yading@10: s->channel[i].subframe_len[s->channel[i].cur_subframe]; yading@10: } yading@10: } yading@10: yading@10: av_dlog(s->avctx, yading@10: "processing subframe with offset %i len %i\n", offset, subframe_len); yading@10: yading@10: /** get a list of all channels that contain the estimated block */ yading@10: s->channels_for_cur_subframe = 0; yading@10: for (i = 0; i < s->avctx->channels; i++) { yading@10: const int cur_subframe = s->channel[i].cur_subframe; yading@10: /** subtract already processed samples */ yading@10: total_samples -= s->channel[i].decoded_samples; yading@10: yading@10: /** and count if there are multiple subframes that match our profile */ yading@10: if (offset == s->channel[i].decoded_samples && yading@10: subframe_len == s->channel[i].subframe_len[cur_subframe]) { yading@10: total_samples -= s->channel[i].subframe_len[cur_subframe]; yading@10: s->channel[i].decoded_samples += yading@10: s->channel[i].subframe_len[cur_subframe]; yading@10: s->channel_indexes_for_cur_subframe[s->channels_for_cur_subframe] = i; yading@10: ++s->channels_for_cur_subframe; yading@10: } yading@10: } yading@10: yading@10: /** check if the frame will be complete after processing the yading@10: estimated block */ yading@10: if (!total_samples) yading@10: s->parsed_all_subframes = 1; yading@10: yading@10: yading@10: av_dlog(s->avctx, "subframe is part of %i channels\n", yading@10: s->channels_for_cur_subframe); yading@10: yading@10: /** calculate number of scale factor bands and their offsets */ yading@10: s->table_idx = av_log2(s->samples_per_frame/subframe_len); yading@10: s->num_bands = s->num_sfb[s->table_idx]; yading@10: s->cur_sfb_offsets = s->sfb_offsets[s->table_idx]; yading@10: cur_subwoofer_cutoff = s->subwoofer_cutoffs[s->table_idx]; yading@10: yading@10: /** configure the decoder for the current subframe */ yading@10: for (i = 0; i < s->channels_for_cur_subframe; i++) { yading@10: int c = s->channel_indexes_for_cur_subframe[i]; yading@10: yading@10: s->channel[c].coeffs = &s->channel[c].out[(s->samples_per_frame >> 1) yading@10: + offset]; yading@10: } yading@10: yading@10: s->subframe_len = subframe_len; yading@10: s->esc_len = av_log2(s->subframe_len - 1) + 1; yading@10: yading@10: /** skip extended header if any */ yading@10: if (get_bits1(&s->gb)) { yading@10: int num_fill_bits; yading@10: if (!(num_fill_bits = get_bits(&s->gb, 2))) { yading@10: int len = get_bits(&s->gb, 4); yading@10: num_fill_bits = (len ? get_bits(&s->gb, len) : 0) + 1; yading@10: } yading@10: yading@10: if (num_fill_bits >= 0) { yading@10: if (get_bits_count(&s->gb) + num_fill_bits > s->num_saved_bits) { yading@10: av_log(s->avctx, AV_LOG_ERROR, "invalid number of fill bits\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: skip_bits_long(&s->gb, num_fill_bits); yading@10: } yading@10: } yading@10: yading@10: /** no idea for what the following bit is used */ yading@10: if (get_bits1(&s->gb)) { yading@10: avpriv_request_sample(s->avctx, "Reserved bit"); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: yading@10: yading@10: if (decode_channel_transform(s) < 0) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: yading@10: for (i = 0; i < s->channels_for_cur_subframe; i++) { yading@10: int c = s->channel_indexes_for_cur_subframe[i]; yading@10: if ((s->channel[c].transmit_coefs = get_bits1(&s->gb))) yading@10: transmit_coeffs = 1; yading@10: } yading@10: yading@10: av_assert0(s->subframe_len <= WMAPRO_BLOCK_MAX_SIZE); yading@10: if (transmit_coeffs) { yading@10: int step; yading@10: int quant_step = 90 * s->bits_per_sample >> 4; yading@10: yading@10: /** decode number of vector coded coefficients */ yading@10: if ((s->transmit_num_vec_coeffs = get_bits1(&s->gb))) { yading@10: int num_bits = av_log2((s->subframe_len + 3)/4) + 1; yading@10: for (i = 0; i < s->channels_for_cur_subframe; i++) { yading@10: int c = s->channel_indexes_for_cur_subframe[i]; yading@10: int num_vec_coeffs = get_bits(&s->gb, num_bits) << 2; yading@10: if (num_vec_coeffs > s->subframe_len) { yading@10: av_log(s->avctx, AV_LOG_ERROR, "num_vec_coeffs %d is too large\n", num_vec_coeffs); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: s->channel[c].num_vec_coeffs = num_vec_coeffs; yading@10: } yading@10: } else { yading@10: for (i = 0; i < s->channels_for_cur_subframe; i++) { yading@10: int c = s->channel_indexes_for_cur_subframe[i]; yading@10: s->channel[c].num_vec_coeffs = s->subframe_len; yading@10: } yading@10: } yading@10: /** decode quantization step */ yading@10: step = get_sbits(&s->gb, 6); yading@10: quant_step += step; yading@10: if (step == -32 || step == 31) { yading@10: const int sign = (step == 31) - 1; yading@10: int quant = 0; yading@10: while (get_bits_count(&s->gb) + 5 < s->num_saved_bits && yading@10: (step = get_bits(&s->gb, 5)) == 31) { yading@10: quant += 31; yading@10: } yading@10: quant_step += ((quant + step) ^ sign) - sign; yading@10: } yading@10: if (quant_step < 0) { yading@10: av_log(s->avctx, AV_LOG_DEBUG, "negative quant step\n"); yading@10: } yading@10: yading@10: /** decode quantization step modifiers for every channel */ yading@10: yading@10: if (s->channels_for_cur_subframe == 1) { yading@10: s->channel[s->channel_indexes_for_cur_subframe[0]].quant_step = quant_step; yading@10: } else { yading@10: int modifier_len = get_bits(&s->gb, 3); yading@10: for (i = 0; i < s->channels_for_cur_subframe; i++) { yading@10: int c = s->channel_indexes_for_cur_subframe[i]; yading@10: s->channel[c].quant_step = quant_step; yading@10: if (get_bits1(&s->gb)) { yading@10: if (modifier_len) { yading@10: s->channel[c].quant_step += get_bits(&s->gb, modifier_len) + 1; yading@10: } else yading@10: ++s->channel[c].quant_step; yading@10: } yading@10: } yading@10: } yading@10: yading@10: /** decode scale factors */ yading@10: if (decode_scale_factors(s) < 0) yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: av_dlog(s->avctx, "BITSTREAM: subframe header length was %i\n", yading@10: get_bits_count(&s->gb) - s->subframe_offset); yading@10: yading@10: /** parse coefficients */ yading@10: for (i = 0; i < s->channels_for_cur_subframe; i++) { yading@10: int c = s->channel_indexes_for_cur_subframe[i]; yading@10: if (s->channel[c].transmit_coefs && yading@10: get_bits_count(&s->gb) < s->num_saved_bits) { yading@10: decode_coeffs(s, c); yading@10: } else yading@10: memset(s->channel[c].coeffs, 0, yading@10: sizeof(*s->channel[c].coeffs) * subframe_len); yading@10: } yading@10: yading@10: av_dlog(s->avctx, "BITSTREAM: subframe length was %i\n", yading@10: get_bits_count(&s->gb) - s->subframe_offset); yading@10: yading@10: if (transmit_coeffs) { yading@10: FFTContext *mdct = &s->mdct_ctx[av_log2(subframe_len) - WMAPRO_BLOCK_MIN_BITS]; yading@10: /** reconstruct the per channel data */ yading@10: inverse_channel_transform(s); yading@10: for (i = 0; i < s->channels_for_cur_subframe; i++) { yading@10: int c = s->channel_indexes_for_cur_subframe[i]; yading@10: const int* sf = s->channel[c].scale_factors; yading@10: int b; yading@10: yading@10: if (c == s->lfe_channel) yading@10: memset(&s->tmp[cur_subwoofer_cutoff], 0, sizeof(*s->tmp) * yading@10: (subframe_len - cur_subwoofer_cutoff)); yading@10: yading@10: /** inverse quantization and rescaling */ yading@10: for (b = 0; b < s->num_bands; b++) { yading@10: const int end = FFMIN(s->cur_sfb_offsets[b+1], s->subframe_len); yading@10: const int exp = s->channel[c].quant_step - yading@10: (s->channel[c].max_scale_factor - *sf++) * yading@10: s->channel[c].scale_factor_step; yading@10: const float quant = pow(10.0, exp / 20.0); yading@10: int start = s->cur_sfb_offsets[b]; yading@10: s->fdsp.vector_fmul_scalar(s->tmp + start, yading@10: s->channel[c].coeffs + start, yading@10: quant, end - start); yading@10: } yading@10: yading@10: /** apply imdct (imdct_half == DCTIV with reverse) */ yading@10: mdct->imdct_half(mdct, s->channel[c].coeffs, s->tmp); yading@10: } yading@10: } yading@10: yading@10: /** window and overlapp-add */ yading@10: wmapro_window(s); yading@10: yading@10: /** handled one subframe */ yading@10: for (i = 0; i < s->channels_for_cur_subframe; i++) { yading@10: int c = s->channel_indexes_for_cur_subframe[i]; yading@10: if (s->channel[c].cur_subframe >= s->channel[c].num_subframes) { yading@10: av_log(s->avctx, AV_LOG_ERROR, "broken subframe\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: ++s->channel[c].cur_subframe; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: /** yading@10: *@brief Decode one WMA frame. yading@10: *@param s codec context yading@10: *@return 0 if the trailer bit indicates that this is the last frame, yading@10: * 1 if there are additional frames yading@10: */ yading@10: static int decode_frame(WMAProDecodeCtx *s, AVFrame *frame, int *got_frame_ptr) yading@10: { yading@10: AVCodecContext *avctx = s->avctx; yading@10: GetBitContext* gb = &s->gb; yading@10: int more_frames = 0; yading@10: int len = 0; yading@10: int i, ret; yading@10: yading@10: /** get frame length */ yading@10: if (s->len_prefix) yading@10: len = get_bits(gb, s->log2_frame_size); yading@10: yading@10: av_dlog(s->avctx, "decoding frame with length %x\n", len); yading@10: yading@10: /** decode tile information */ yading@10: if (decode_tilehdr(s)) { yading@10: s->packet_loss = 1; yading@10: return 0; yading@10: } yading@10: yading@10: /** read postproc transform */ yading@10: if (s->avctx->channels > 1 && get_bits1(gb)) { yading@10: if (get_bits1(gb)) { yading@10: for (i = 0; i < avctx->channels * avctx->channels; i++) yading@10: skip_bits(gb, 4); yading@10: } yading@10: } yading@10: yading@10: /** read drc info */ yading@10: if (s->dynamic_range_compression) { yading@10: s->drc_gain = get_bits(gb, 8); yading@10: av_dlog(s->avctx, "drc_gain %i\n", s->drc_gain); yading@10: } yading@10: yading@10: /** no idea what these are for, might be the number of samples yading@10: that need to be skipped at the beginning or end of a stream */ yading@10: if (get_bits1(gb)) { yading@10: int av_unused skip; yading@10: yading@10: /** usually true for the first frame */ yading@10: if (get_bits1(gb)) { yading@10: skip = get_bits(gb, av_log2(s->samples_per_frame * 2)); yading@10: av_dlog(s->avctx, "start skip: %i\n", skip); yading@10: } yading@10: yading@10: /** sometimes true for the last frame */ yading@10: if (get_bits1(gb)) { yading@10: skip = get_bits(gb, av_log2(s->samples_per_frame * 2)); yading@10: av_dlog(s->avctx, "end skip: %i\n", skip); yading@10: } yading@10: yading@10: } yading@10: yading@10: av_dlog(s->avctx, "BITSTREAM: frame header length was %i\n", yading@10: get_bits_count(gb) - s->frame_offset); yading@10: yading@10: /** reset subframe states */ yading@10: s->parsed_all_subframes = 0; yading@10: for (i = 0; i < avctx->channels; i++) { yading@10: s->channel[i].decoded_samples = 0; yading@10: s->channel[i].cur_subframe = 0; yading@10: s->channel[i].reuse_sf = 0; yading@10: } yading@10: yading@10: /** decode all subframes */ yading@10: while (!s->parsed_all_subframes) { yading@10: if (decode_subframe(s) < 0) { yading@10: s->packet_loss = 1; yading@10: return 0; yading@10: } yading@10: } yading@10: yading@10: /* get output buffer */ yading@10: frame->nb_samples = s->samples_per_frame; yading@10: if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) { yading@10: s->packet_loss = 1; yading@10: return 0; yading@10: } yading@10: yading@10: /** copy samples to the output buffer */ yading@10: for (i = 0; i < avctx->channels; i++) yading@10: memcpy(frame->extended_data[i], s->channel[i].out, yading@10: s->samples_per_frame * sizeof(*s->channel[i].out)); yading@10: yading@10: for (i = 0; i < avctx->channels; i++) { yading@10: /** reuse second half of the IMDCT output for the next frame */ yading@10: memcpy(&s->channel[i].out[0], yading@10: &s->channel[i].out[s->samples_per_frame], yading@10: s->samples_per_frame * sizeof(*s->channel[i].out) >> 1); yading@10: } yading@10: yading@10: if (s->skip_frame) { yading@10: s->skip_frame = 0; yading@10: *got_frame_ptr = 0; yading@10: av_frame_unref(frame); yading@10: } else { yading@10: *got_frame_ptr = 1; yading@10: } yading@10: yading@10: if (s->len_prefix) { yading@10: if (len != (get_bits_count(gb) - s->frame_offset) + 2) { yading@10: /** FIXME: not sure if this is always an error */ yading@10: av_log(s->avctx, AV_LOG_ERROR, yading@10: "frame[%i] would have to skip %i bits\n", s->frame_num, yading@10: len - (get_bits_count(gb) - s->frame_offset) - 1); yading@10: s->packet_loss = 1; yading@10: return 0; yading@10: } yading@10: yading@10: /** skip the rest of the frame data */ yading@10: skip_bits_long(gb, len - (get_bits_count(gb) - s->frame_offset) - 1); yading@10: } else { yading@10: while (get_bits_count(gb) < s->num_saved_bits && get_bits1(gb) == 0) { yading@10: } yading@10: } yading@10: yading@10: /** decode trailer bit */ yading@10: more_frames = get_bits1(gb); yading@10: yading@10: ++s->frame_num; yading@10: return more_frames; yading@10: } yading@10: yading@10: /** yading@10: *@brief Calculate remaining input buffer length. yading@10: *@param s codec context yading@10: *@param gb bitstream reader context yading@10: *@return remaining size in bits yading@10: */ yading@10: static int remaining_bits(WMAProDecodeCtx *s, GetBitContext *gb) yading@10: { yading@10: return s->buf_bit_size - get_bits_count(gb); yading@10: } yading@10: yading@10: /** yading@10: *@brief Fill the bit reservoir with a (partial) frame. yading@10: *@param s codec context yading@10: *@param gb bitstream reader context yading@10: *@param len length of the partial frame yading@10: *@param append decides whether to reset the buffer or not yading@10: */ yading@10: static void save_bits(WMAProDecodeCtx *s, GetBitContext* gb, int len, yading@10: int append) yading@10: { yading@10: int buflen; yading@10: yading@10: /** when the frame data does not need to be concatenated, the input buffer yading@10: is reset and additional bits from the previous frame are copied yading@10: and skipped later so that a fast byte copy is possible */ yading@10: yading@10: if (!append) { yading@10: s->frame_offset = get_bits_count(gb) & 7; yading@10: s->num_saved_bits = s->frame_offset; yading@10: init_put_bits(&s->pb, s->frame_data, MAX_FRAMESIZE); yading@10: } yading@10: yading@10: buflen = (put_bits_count(&s->pb) + len + 8) >> 3; yading@10: yading@10: if (len <= 0 || buflen > MAX_FRAMESIZE) { yading@10: avpriv_request_sample(s->avctx, "Too small input buffer"); yading@10: s->packet_loss = 1; yading@10: return; yading@10: } yading@10: yading@10: s->num_saved_bits += len; yading@10: if (!append) { yading@10: avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), yading@10: s->num_saved_bits); yading@10: } else { yading@10: int align = 8 - (get_bits_count(gb) & 7); yading@10: align = FFMIN(align, len); yading@10: put_bits(&s->pb, align, get_bits(gb, align)); yading@10: len -= align; yading@10: avpriv_copy_bits(&s->pb, gb->buffer + (get_bits_count(gb) >> 3), len); yading@10: } yading@10: skip_bits_long(gb, len); yading@10: yading@10: { yading@10: PutBitContext tmp = s->pb; yading@10: flush_put_bits(&tmp); yading@10: } yading@10: yading@10: init_get_bits(&s->gb, s->frame_data, s->num_saved_bits); yading@10: skip_bits(&s->gb, s->frame_offset); yading@10: } yading@10: yading@10: /** yading@10: *@brief Decode a single WMA packet. yading@10: *@param avctx codec context yading@10: *@param data the output buffer yading@10: *@param avpkt input packet yading@10: *@return number of bytes that were read from the input buffer yading@10: */ yading@10: static int decode_packet(AVCodecContext *avctx, void *data, yading@10: int *got_frame_ptr, AVPacket* avpkt) yading@10: { yading@10: WMAProDecodeCtx *s = avctx->priv_data; yading@10: GetBitContext* gb = &s->pgb; yading@10: const uint8_t* buf = avpkt->data; yading@10: int buf_size = avpkt->size; yading@10: int num_bits_prev_frame; yading@10: int packet_sequence_number; yading@10: yading@10: *got_frame_ptr = 0; yading@10: yading@10: if (s->packet_done || s->packet_loss) { yading@10: s->packet_done = 0; yading@10: yading@10: /** sanity check for the buffer length */ yading@10: if (buf_size < avctx->block_align) { yading@10: av_log(avctx, AV_LOG_ERROR, "Input packet too small (%d < %d)\n", yading@10: buf_size, avctx->block_align); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: s->next_packet_start = buf_size - avctx->block_align; yading@10: buf_size = avctx->block_align; yading@10: s->buf_bit_size = buf_size << 3; yading@10: yading@10: /** parse packet header */ yading@10: init_get_bits(gb, buf, s->buf_bit_size); yading@10: packet_sequence_number = get_bits(gb, 4); yading@10: skip_bits(gb, 2); yading@10: yading@10: /** get number of bits that need to be added to the previous frame */ yading@10: num_bits_prev_frame = get_bits(gb, s->log2_frame_size); yading@10: av_dlog(avctx, "packet[%d]: nbpf %x\n", avctx->frame_number, yading@10: num_bits_prev_frame); yading@10: yading@10: /** check for packet loss */ yading@10: if (!s->packet_loss && yading@10: ((s->packet_sequence_number + 1) & 0xF) != packet_sequence_number) { yading@10: s->packet_loss = 1; yading@10: av_log(avctx, AV_LOG_ERROR, "Packet loss detected! seq %x vs %x\n", yading@10: s->packet_sequence_number, packet_sequence_number); yading@10: } yading@10: s->packet_sequence_number = packet_sequence_number; yading@10: yading@10: if (num_bits_prev_frame > 0) { yading@10: int remaining_packet_bits = s->buf_bit_size - get_bits_count(gb); yading@10: if (num_bits_prev_frame >= remaining_packet_bits) { yading@10: num_bits_prev_frame = remaining_packet_bits; yading@10: s->packet_done = 1; yading@10: } yading@10: yading@10: /** append the previous frame data to the remaining data from the yading@10: previous packet to create a full frame */ yading@10: save_bits(s, gb, num_bits_prev_frame, 1); yading@10: av_dlog(avctx, "accumulated %x bits of frame data\n", yading@10: s->num_saved_bits - s->frame_offset); yading@10: yading@10: /** decode the cross packet frame if it is valid */ yading@10: if (!s->packet_loss) yading@10: decode_frame(s, data, got_frame_ptr); yading@10: } else if (s->num_saved_bits - s->frame_offset) { yading@10: av_dlog(avctx, "ignoring %x previously saved bits\n", yading@10: s->num_saved_bits - s->frame_offset); yading@10: } yading@10: yading@10: if (s->packet_loss) { yading@10: /** reset number of saved bits so that the decoder yading@10: does not start to decode incomplete frames in the yading@10: s->len_prefix == 0 case */ yading@10: s->num_saved_bits = 0; yading@10: s->packet_loss = 0; yading@10: } yading@10: yading@10: } else { yading@10: int frame_size; yading@10: s->buf_bit_size = (avpkt->size - s->next_packet_start) << 3; yading@10: init_get_bits(gb, avpkt->data, s->buf_bit_size); yading@10: skip_bits(gb, s->packet_offset); yading@10: if (s->len_prefix && remaining_bits(s, gb) > s->log2_frame_size && yading@10: (frame_size = show_bits(gb, s->log2_frame_size)) && yading@10: frame_size <= remaining_bits(s, gb)) { yading@10: save_bits(s, gb, frame_size, 0); yading@10: s->packet_done = !decode_frame(s, data, got_frame_ptr); yading@10: } else if (!s->len_prefix yading@10: && s->num_saved_bits > get_bits_count(&s->gb)) { yading@10: /** when the frames do not have a length prefix, we don't know yading@10: the compressed length of the individual frames yading@10: however, we know what part of a new packet belongs to the yading@10: previous frame yading@10: therefore we save the incoming packet first, then we append yading@10: the "previous frame" data from the next packet so that yading@10: we get a buffer that only contains full frames */ yading@10: s->packet_done = !decode_frame(s, data, got_frame_ptr); yading@10: } else yading@10: s->packet_done = 1; yading@10: } yading@10: yading@10: if (s->packet_done && !s->packet_loss && yading@10: remaining_bits(s, gb) > 0) { yading@10: /** save the rest of the data so that it can be decoded yading@10: with the next packet */ yading@10: save_bits(s, gb, remaining_bits(s, gb), 0); yading@10: } yading@10: yading@10: s->packet_offset = get_bits_count(gb) & 7; yading@10: if (s->packet_loss) yading@10: return AVERROR_INVALIDDATA; yading@10: yading@10: return get_bits_count(gb) >> 3; yading@10: } yading@10: yading@10: /** yading@10: *@brief Clear decoder buffers (for seeking). yading@10: *@param avctx codec context yading@10: */ yading@10: static void flush(AVCodecContext *avctx) yading@10: { yading@10: WMAProDecodeCtx *s = avctx->priv_data; yading@10: int i; yading@10: /** reset output buffer as a part of it is used during the windowing of a yading@10: new frame */ yading@10: for (i = 0; i < avctx->channels; i++) yading@10: memset(s->channel[i].out, 0, s->samples_per_frame * yading@10: sizeof(*s->channel[i].out)); yading@10: s->packet_loss = 1; yading@10: } yading@10: yading@10: yading@10: /** yading@10: *@brief wmapro decoder yading@10: */ yading@10: AVCodec ff_wmapro_decoder = { yading@10: .name = "wmapro", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_WMAPRO, yading@10: .priv_data_size = sizeof(WMAProDecodeCtx), yading@10: .init = decode_init, yading@10: .close = decode_end, yading@10: .decode = decode_packet, yading@10: .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1, yading@10: .flush = flush, yading@10: .long_name = NULL_IF_CONFIG_SMALL("Windows Media Audio 9 Professional"), yading@10: .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLTP, yading@10: AV_SAMPLE_FMT_NONE }, yading@10: };