yading@10: /* yading@10: * ALAC (Apple Lossless Audio Codec) decoder yading@10: * Copyright (c) 2005 David Hammerton 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: * ALAC (Apple Lossless Audio Codec) decoder yading@10: * @author 2005 David Hammerton yading@10: * @see http://crazney.net/programs/itunes/alac.html yading@10: * yading@10: * Note: This decoder expects a 36-byte QuickTime atom to be yading@10: * passed through the extradata[_size] fields. This atom is tacked onto yading@10: * the end of an 'alac' stsd atom and has the following format: yading@10: * yading@10: * 32bit atom size yading@10: * 32bit tag ("alac") yading@10: * 32bit tag version (0) yading@10: * 32bit samples per frame (used when not set explicitly in the frames) yading@10: * 8bit compatible version (0) yading@10: * 8bit sample size yading@10: * 8bit history mult (40) yading@10: * 8bit initial history (10) yading@10: * 8bit rice param limit (14) yading@10: * 8bit channels yading@10: * 16bit maxRun (255) yading@10: * 32bit max coded frame size (0 means unknown) yading@10: * 32bit average bitrate (0 means unknown) yading@10: * 32bit samplerate yading@10: */ yading@10: yading@10: #include "libavutil/channel_layout.h" yading@10: #include "avcodec.h" yading@10: #include "get_bits.h" yading@10: #include "bytestream.h" yading@10: #include "internal.h" yading@10: #include "unary.h" yading@10: #include "mathops.h" yading@10: #include "alac_data.h" yading@10: yading@10: #define ALAC_EXTRADATA_SIZE 36 yading@10: yading@10: typedef struct { yading@10: AVCodecContext *avctx; yading@10: GetBitContext gb; yading@10: int channels; yading@10: yading@10: int32_t *predict_error_buffer[2]; yading@10: int32_t *output_samples_buffer[2]; yading@10: int32_t *extra_bits_buffer[2]; yading@10: yading@10: uint32_t max_samples_per_frame; yading@10: uint8_t sample_size; yading@10: uint8_t rice_history_mult; yading@10: uint8_t rice_initial_history; yading@10: uint8_t rice_limit; yading@10: yading@10: int extra_bits; /**< number of extra bits beyond 16-bit */ yading@10: int nb_samples; /**< number of samples in the current frame */ yading@10: yading@10: int direct_output; yading@10: } ALACContext; yading@10: yading@10: static inline unsigned int decode_scalar(GetBitContext *gb, int k, int bps) yading@10: { yading@10: unsigned int x = get_unary_0_9(gb); yading@10: yading@10: if (x > 8) { /* RICE THRESHOLD */ yading@10: /* use alternative encoding */ yading@10: x = get_bits_long(gb, bps); yading@10: } else if (k != 1) { yading@10: int extrabits = show_bits(gb, k); yading@10: yading@10: /* multiply x by 2^k - 1, as part of their strange algorithm */ yading@10: x = (x << k) - x; yading@10: yading@10: if (extrabits > 1) { yading@10: x += extrabits - 1; yading@10: skip_bits(gb, k); yading@10: } else yading@10: skip_bits(gb, k - 1); yading@10: } yading@10: return x; yading@10: } yading@10: yading@10: static int rice_decompress(ALACContext *alac, int32_t *output_buffer, yading@10: int nb_samples, int bps, int rice_history_mult) yading@10: { yading@10: int i; yading@10: unsigned int history = alac->rice_initial_history; yading@10: int sign_modifier = 0; yading@10: yading@10: for (i = 0; i < nb_samples; i++) { yading@10: int k; yading@10: unsigned int x; yading@10: yading@10: if(get_bits_left(&alac->gb) <= 0) yading@10: return -1; yading@10: yading@10: /* calculate rice param and decode next value */ yading@10: k = av_log2((history >> 9) + 3); yading@10: k = FFMIN(k, alac->rice_limit); yading@10: x = decode_scalar(&alac->gb, k, bps); yading@10: x += sign_modifier; yading@10: sign_modifier = 0; yading@10: output_buffer[i] = (x >> 1) ^ -(x & 1); yading@10: yading@10: /* update the history */ yading@10: if (x > 0xffff) yading@10: history = 0xffff; yading@10: else yading@10: history += x * rice_history_mult - yading@10: ((history * rice_history_mult) >> 9); yading@10: yading@10: /* special case: there may be compressed blocks of 0 */ yading@10: if ((history < 128) && (i + 1 < nb_samples)) { yading@10: int block_size; yading@10: yading@10: /* calculate rice param and decode block size */ yading@10: k = 7 - av_log2(history) + ((history + 16) >> 6); yading@10: k = FFMIN(k, alac->rice_limit); yading@10: block_size = decode_scalar(&alac->gb, k, 16); yading@10: yading@10: if (block_size > 0) { yading@10: if (block_size >= nb_samples - i) { yading@10: av_log(alac->avctx, AV_LOG_ERROR, yading@10: "invalid zero block size of %d %d %d\n", block_size, yading@10: nb_samples, i); yading@10: block_size = nb_samples - i - 1; yading@10: } yading@10: memset(&output_buffer[i + 1], 0, yading@10: block_size * sizeof(*output_buffer)); yading@10: i += block_size; yading@10: } yading@10: if (block_size <= 0xffff) yading@10: sign_modifier = 1; yading@10: history = 0; yading@10: } yading@10: } yading@10: return 0; yading@10: } yading@10: yading@10: static inline int sign_only(int v) yading@10: { yading@10: return v ? FFSIGN(v) : 0; yading@10: } yading@10: yading@10: static void lpc_prediction(int32_t *error_buffer, int32_t *buffer_out, yading@10: int nb_samples, int bps, int16_t *lpc_coefs, yading@10: int lpc_order, int lpc_quant) yading@10: { yading@10: int i; yading@10: int32_t *pred = buffer_out; yading@10: yading@10: /* first sample always copies */ yading@10: *buffer_out = *error_buffer; yading@10: yading@10: if (nb_samples <= 1) yading@10: return; yading@10: yading@10: if (!lpc_order) { yading@10: memcpy(&buffer_out[1], &error_buffer[1], yading@10: (nb_samples - 1) * sizeof(*buffer_out)); yading@10: return; yading@10: } yading@10: yading@10: if (lpc_order == 31) { yading@10: /* simple 1st-order prediction */ yading@10: for (i = 1; i < nb_samples; i++) { yading@10: buffer_out[i] = sign_extend(buffer_out[i - 1] + error_buffer[i], yading@10: bps); yading@10: } yading@10: return; yading@10: } yading@10: yading@10: /* read warm-up samples */ yading@10: for (i = 1; i <= lpc_order && i < nb_samples; i++) yading@10: buffer_out[i] = sign_extend(buffer_out[i - 1] + error_buffer[i], bps); yading@10: yading@10: /* NOTE: 4 and 8 are very common cases that could be optimized. */ yading@10: yading@10: for (; i < nb_samples; i++) { yading@10: int j; yading@10: int val = 0; yading@10: int error_val = error_buffer[i]; yading@10: int error_sign; yading@10: int d = *pred++; yading@10: yading@10: /* LPC prediction */ yading@10: for (j = 0; j < lpc_order; j++) yading@10: val += (pred[j] - d) * lpc_coefs[j]; yading@10: val = (val + (1 << (lpc_quant - 1))) >> lpc_quant; yading@10: val += d + error_val; yading@10: buffer_out[i] = sign_extend(val, bps); yading@10: yading@10: /* adapt LPC coefficients */ yading@10: error_sign = sign_only(error_val); yading@10: if (error_sign) { yading@10: for (j = 0; j < lpc_order && error_val * error_sign > 0; j++) { yading@10: int sign; yading@10: val = d - pred[j]; yading@10: sign = sign_only(val) * error_sign; yading@10: lpc_coefs[j] -= sign; yading@10: val *= sign; yading@10: error_val -= (val >> lpc_quant) * (j + 1); yading@10: } yading@10: } yading@10: } yading@10: } yading@10: yading@10: static void decorrelate_stereo(int32_t *buffer[2], int nb_samples, yading@10: int decorr_shift, int decorr_left_weight) yading@10: { yading@10: int i; yading@10: yading@10: for (i = 0; i < nb_samples; i++) { yading@10: int32_t a, b; yading@10: yading@10: a = buffer[0][i]; yading@10: b = buffer[1][i]; yading@10: yading@10: a -= (b * decorr_left_weight) >> decorr_shift; yading@10: b += a; yading@10: yading@10: buffer[0][i] = b; yading@10: buffer[1][i] = a; yading@10: } yading@10: } yading@10: yading@10: static void append_extra_bits(int32_t *buffer[2], int32_t *extra_bits_buffer[2], yading@10: int extra_bits, int channels, int nb_samples) yading@10: { yading@10: int i, ch; yading@10: yading@10: for (ch = 0; ch < channels; ch++) yading@10: for (i = 0; i < nb_samples; i++) yading@10: buffer[ch][i] = (buffer[ch][i] << extra_bits) | extra_bits_buffer[ch][i]; yading@10: } yading@10: yading@10: static int decode_element(AVCodecContext *avctx, AVFrame *frame, int ch_index, yading@10: int channels) yading@10: { yading@10: ALACContext *alac = avctx->priv_data; yading@10: int has_size, bps, is_compressed, decorr_shift, decorr_left_weight, ret; yading@10: uint32_t output_samples; yading@10: int i, ch; yading@10: yading@10: skip_bits(&alac->gb, 4); /* element instance tag */ yading@10: skip_bits(&alac->gb, 12); /* unused header bits */ yading@10: yading@10: /* the number of output samples is stored in the frame */ yading@10: has_size = get_bits1(&alac->gb); yading@10: yading@10: alac->extra_bits = get_bits(&alac->gb, 2) << 3; yading@10: bps = alac->sample_size - alac->extra_bits + channels - 1; yading@10: if (bps > 32U) { yading@10: av_log(avctx, AV_LOG_ERROR, "bps is unsupported: %d\n", bps); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: yading@10: /* whether the frame is compressed */ yading@10: is_compressed = !get_bits1(&alac->gb); yading@10: yading@10: if (has_size) yading@10: output_samples = get_bits_long(&alac->gb, 32); yading@10: else yading@10: output_samples = alac->max_samples_per_frame; yading@10: if (!output_samples || output_samples > alac->max_samples_per_frame) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid samples per frame: %d\n", yading@10: output_samples); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: if (!alac->nb_samples) { yading@10: /* get output buffer */ yading@10: frame->nb_samples = output_samples; yading@10: if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) yading@10: return ret; yading@10: } else if (output_samples != alac->nb_samples) { yading@10: av_log(avctx, AV_LOG_ERROR, "sample count mismatch: %u != %d\n", yading@10: output_samples, alac->nb_samples); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: alac->nb_samples = output_samples; yading@10: if (alac->direct_output) { yading@10: for (ch = 0; ch < channels; ch++) yading@10: alac->output_samples_buffer[ch] = (int32_t *)frame->extended_data[ch_index + ch]; yading@10: } yading@10: yading@10: if (is_compressed) { yading@10: int16_t lpc_coefs[2][32]; yading@10: int lpc_order[2]; yading@10: int prediction_type[2]; yading@10: int lpc_quant[2]; yading@10: int rice_history_mult[2]; yading@10: yading@10: decorr_shift = get_bits(&alac->gb, 8); yading@10: decorr_left_weight = get_bits(&alac->gb, 8); yading@10: yading@10: for (ch = 0; ch < channels; ch++) { yading@10: prediction_type[ch] = get_bits(&alac->gb, 4); yading@10: lpc_quant[ch] = get_bits(&alac->gb, 4); yading@10: rice_history_mult[ch] = get_bits(&alac->gb, 3); yading@10: lpc_order[ch] = get_bits(&alac->gb, 5); yading@10: yading@10: /* read the predictor table */ yading@10: for (i = lpc_order[ch] - 1; i >= 0; i--) yading@10: lpc_coefs[ch][i] = get_sbits(&alac->gb, 16); yading@10: } yading@10: yading@10: if (alac->extra_bits) { yading@10: for (i = 0; i < alac->nb_samples; i++) { yading@10: if(get_bits_left(&alac->gb) <= 0) yading@10: return -1; yading@10: for (ch = 0; ch < channels; ch++) yading@10: alac->extra_bits_buffer[ch][i] = get_bits(&alac->gb, alac->extra_bits); yading@10: } yading@10: } yading@10: for (ch = 0; ch < channels; ch++) { yading@10: int ret=rice_decompress(alac, alac->predict_error_buffer[ch], yading@10: alac->nb_samples, bps, yading@10: rice_history_mult[ch] * alac->rice_history_mult / 4); yading@10: if(ret<0) yading@10: return ret; yading@10: yading@10: /* adaptive FIR filter */ yading@10: if (prediction_type[ch] == 15) { yading@10: /* Prediction type 15 runs the adaptive FIR twice. yading@10: * The first pass uses the special-case coef_num = 31, while yading@10: * the second pass uses the coefs from the bitstream. yading@10: * yading@10: * However, this prediction type is not currently used by the yading@10: * reference encoder. yading@10: */ yading@10: lpc_prediction(alac->predict_error_buffer[ch], yading@10: alac->predict_error_buffer[ch], yading@10: alac->nb_samples, bps, NULL, 31, 0); yading@10: } else if (prediction_type[ch] > 0) { yading@10: av_log(avctx, AV_LOG_WARNING, "unknown prediction type: %i\n", yading@10: prediction_type[ch]); yading@10: } yading@10: lpc_prediction(alac->predict_error_buffer[ch], yading@10: alac->output_samples_buffer[ch], alac->nb_samples, yading@10: bps, lpc_coefs[ch], lpc_order[ch], lpc_quant[ch]); yading@10: } yading@10: } else { yading@10: /* not compressed, easy case */ yading@10: for (i = 0; i < alac->nb_samples; i++) { yading@10: if(get_bits_left(&alac->gb) <= 0) yading@10: return -1; yading@10: for (ch = 0; ch < channels; ch++) { yading@10: alac->output_samples_buffer[ch][i] = yading@10: get_sbits_long(&alac->gb, alac->sample_size); yading@10: } yading@10: } yading@10: alac->extra_bits = 0; yading@10: decorr_shift = 0; yading@10: decorr_left_weight = 0; yading@10: } yading@10: yading@10: if (channels == 2 && decorr_left_weight) { yading@10: decorrelate_stereo(alac->output_samples_buffer, alac->nb_samples, yading@10: decorr_shift, decorr_left_weight); yading@10: } yading@10: yading@10: if (alac->extra_bits) { yading@10: append_extra_bits(alac->output_samples_buffer, alac->extra_bits_buffer, yading@10: alac->extra_bits, channels, alac->nb_samples); yading@10: } yading@10: yading@10: if(av_sample_fmt_is_planar(avctx->sample_fmt)) { yading@10: switch(alac->sample_size) { yading@10: case 16: { yading@10: for (ch = 0; ch < channels; ch++) { yading@10: int16_t *outbuffer = (int16_t *)frame->extended_data[ch_index + ch]; yading@10: for (i = 0; i < alac->nb_samples; i++) yading@10: *outbuffer++ = alac->output_samples_buffer[ch][i]; yading@10: }} yading@10: break; yading@10: case 24: { yading@10: for (ch = 0; ch < channels; ch++) { yading@10: for (i = 0; i < alac->nb_samples; i++) yading@10: alac->output_samples_buffer[ch][i] <<= 8; yading@10: }} yading@10: break; yading@10: } yading@10: }else{ yading@10: switch(alac->sample_size) { yading@10: case 16: { yading@10: int16_t *outbuffer = ((int16_t *)frame->extended_data[0]) + ch_index; yading@10: for (i = 0; i < alac->nb_samples; i++) { yading@10: for (ch = 0; ch < channels; ch++) yading@10: *outbuffer++ = alac->output_samples_buffer[ch][i]; yading@10: outbuffer += alac->channels - channels; yading@10: } yading@10: } yading@10: break; yading@10: case 24: { yading@10: int32_t *outbuffer = ((int32_t *)frame->extended_data[0]) + ch_index; yading@10: for (i = 0; i < alac->nb_samples; i++) { yading@10: for (ch = 0; ch < channels; ch++) yading@10: *outbuffer++ = alac->output_samples_buffer[ch][i] << 8; yading@10: outbuffer += alac->channels - channels; yading@10: } yading@10: } yading@10: break; yading@10: case 32: { yading@10: int32_t *outbuffer = ((int32_t *)frame->extended_data[0]) + ch_index; yading@10: for (i = 0; i < alac->nb_samples; i++) { yading@10: for (ch = 0; ch < channels; ch++) yading@10: *outbuffer++ = alac->output_samples_buffer[ch][i]; yading@10: outbuffer += alac->channels - channels; yading@10: } yading@10: } yading@10: break; yading@10: } yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int alac_decode_frame(AVCodecContext *avctx, void *data, yading@10: int *got_frame_ptr, AVPacket *avpkt) yading@10: { yading@10: ALACContext *alac = avctx->priv_data; yading@10: AVFrame *frame = data; yading@10: enum AlacRawDataBlockType element; yading@10: int channels; yading@10: int ch, ret, got_end; yading@10: yading@10: init_get_bits(&alac->gb, avpkt->data, avpkt->size * 8); yading@10: yading@10: got_end = 0; yading@10: alac->nb_samples = 0; yading@10: ch = 0; yading@10: while (get_bits_left(&alac->gb) >= 3) { yading@10: element = get_bits(&alac->gb, 3); yading@10: if (element == TYPE_END) { yading@10: got_end = 1; yading@10: break; yading@10: } yading@10: if (element > TYPE_CPE && element != TYPE_LFE) { yading@10: av_log(avctx, AV_LOG_ERROR, "syntax element unsupported: %d\n", element); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: yading@10: channels = (element == TYPE_CPE) ? 2 : 1; yading@10: if ( ch + channels > alac->channels yading@10: || ff_alac_channel_layout_offsets[alac->channels - 1][ch] + channels > alac->channels yading@10: ) { yading@10: av_log(avctx, AV_LOG_ERROR, "invalid element channel count\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: ret = decode_element(avctx, frame, yading@10: ff_alac_channel_layout_offsets[alac->channels - 1][ch], yading@10: channels); yading@10: if (ret < 0 && get_bits_left(&alac->gb)) yading@10: return ret; yading@10: yading@10: ch += channels; yading@10: } yading@10: if (!got_end) { yading@10: av_log(avctx, AV_LOG_ERROR, "no end tag found. incomplete packet.\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: yading@10: if (avpkt->size * 8 - get_bits_count(&alac->gb) > 8) { yading@10: av_log(avctx, AV_LOG_ERROR, "Error : %d bits left\n", yading@10: avpkt->size * 8 - get_bits_count(&alac->gb)); yading@10: } yading@10: yading@10: *got_frame_ptr = 1; yading@10: yading@10: return avpkt->size; yading@10: } yading@10: yading@10: static av_cold int alac_decode_close(AVCodecContext *avctx) yading@10: { yading@10: ALACContext *alac = avctx->priv_data; yading@10: yading@10: int ch; yading@10: for (ch = 0; ch < FFMIN(alac->channels, 2); ch++) { yading@10: av_freep(&alac->predict_error_buffer[ch]); yading@10: if (!alac->direct_output) yading@10: av_freep(&alac->output_samples_buffer[ch]); yading@10: av_freep(&alac->extra_bits_buffer[ch]); yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int allocate_buffers(ALACContext *alac) yading@10: { yading@10: int ch; yading@10: int buf_size; yading@10: yading@10: if (alac->max_samples_per_frame > INT_MAX / sizeof(int32_t)) yading@10: goto buf_alloc_fail; yading@10: buf_size = alac->max_samples_per_frame * sizeof(int32_t); yading@10: yading@10: for (ch = 0; ch < FFMIN(alac->channels, 2); ch++) { yading@10: FF_ALLOC_OR_GOTO(alac->avctx, alac->predict_error_buffer[ch], yading@10: buf_size, buf_alloc_fail); yading@10: yading@10: alac->direct_output = alac->sample_size > 16 && av_sample_fmt_is_planar(alac->avctx->sample_fmt); yading@10: if (!alac->direct_output) { yading@10: FF_ALLOC_OR_GOTO(alac->avctx, alac->output_samples_buffer[ch], yading@10: buf_size, buf_alloc_fail); yading@10: } yading@10: yading@10: FF_ALLOC_OR_GOTO(alac->avctx, alac->extra_bits_buffer[ch], yading@10: buf_size, buf_alloc_fail); yading@10: } yading@10: return 0; yading@10: buf_alloc_fail: yading@10: alac_decode_close(alac->avctx); yading@10: return AVERROR(ENOMEM); yading@10: } yading@10: yading@10: static int alac_set_info(ALACContext *alac) yading@10: { yading@10: GetByteContext gb; yading@10: yading@10: bytestream2_init(&gb, alac->avctx->extradata, yading@10: alac->avctx->extradata_size); yading@10: yading@10: bytestream2_skipu(&gb, 12); // size:4, alac:4, version:4 yading@10: yading@10: alac->max_samples_per_frame = bytestream2_get_be32u(&gb); yading@10: if (!alac->max_samples_per_frame || alac->max_samples_per_frame > INT_MAX) { yading@10: av_log(alac->avctx, AV_LOG_ERROR, "max samples per frame invalid: %u\n", yading@10: alac->max_samples_per_frame); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: bytestream2_skipu(&gb, 1); // compatible version yading@10: alac->sample_size = bytestream2_get_byteu(&gb); yading@10: alac->rice_history_mult = bytestream2_get_byteu(&gb); yading@10: alac->rice_initial_history = bytestream2_get_byteu(&gb); yading@10: alac->rice_limit = bytestream2_get_byteu(&gb); yading@10: alac->channels = bytestream2_get_byteu(&gb); yading@10: bytestream2_get_be16u(&gb); // maxRun yading@10: bytestream2_get_be32u(&gb); // max coded frame size yading@10: bytestream2_get_be32u(&gb); // average bitrate yading@10: bytestream2_get_be32u(&gb); // samplerate yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static av_cold int alac_decode_init(AVCodecContext * avctx) yading@10: { yading@10: int ret; yading@10: int req_packed; yading@10: ALACContext *alac = avctx->priv_data; yading@10: alac->avctx = avctx; yading@10: yading@10: /* initialize from the extradata */ yading@10: if (alac->avctx->extradata_size < ALAC_EXTRADATA_SIZE) { yading@10: av_log(avctx, AV_LOG_ERROR, "extradata is too small\n"); yading@10: return AVERROR_INVALIDDATA; yading@10: } yading@10: if (alac_set_info(alac)) { yading@10: av_log(avctx, AV_LOG_ERROR, "set_info failed\n"); yading@10: return -1; yading@10: } yading@10: yading@10: req_packed = LIBAVCODEC_VERSION_MAJOR < 55 && !av_sample_fmt_is_planar(avctx->request_sample_fmt); yading@10: switch (alac->sample_size) { yading@10: case 16: avctx->sample_fmt = req_packed ? AV_SAMPLE_FMT_S16 : AV_SAMPLE_FMT_S16P; yading@10: break; yading@10: case 24: yading@10: case 32: avctx->sample_fmt = req_packed ? AV_SAMPLE_FMT_S32 : AV_SAMPLE_FMT_S32P; yading@10: break; yading@10: default: avpriv_request_sample(avctx, "Sample depth %d", alac->sample_size); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: avctx->bits_per_raw_sample = alac->sample_size; yading@10: yading@10: if (alac->channels < 1) { yading@10: av_log(avctx, AV_LOG_WARNING, "Invalid channel count\n"); yading@10: alac->channels = avctx->channels; yading@10: } else { yading@10: if (alac->channels > ALAC_MAX_CHANNELS) yading@10: alac->channels = avctx->channels; yading@10: else yading@10: avctx->channels = alac->channels; yading@10: } yading@10: if (avctx->channels > ALAC_MAX_CHANNELS || avctx->channels <= 0 ) { yading@10: av_log(avctx, AV_LOG_ERROR, "Unsupported channel count: %d\n", yading@10: avctx->channels); yading@10: return AVERROR_PATCHWELCOME; yading@10: } yading@10: avctx->channel_layout = ff_alac_channel_layouts[alac->channels - 1]; yading@10: yading@10: if ((ret = allocate_buffers(alac)) < 0) { yading@10: av_log(avctx, AV_LOG_ERROR, "Error allocating buffers\n"); yading@10: return ret; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: AVCodec ff_alac_decoder = { yading@10: .name = "alac", yading@10: .type = AVMEDIA_TYPE_AUDIO, yading@10: .id = AV_CODEC_ID_ALAC, yading@10: .priv_data_size = sizeof(ALACContext), yading@10: .init = alac_decode_init, yading@10: .close = alac_decode_close, yading@10: .decode = alac_decode_frame, yading@10: .capabilities = CODEC_CAP_DR1, yading@10: .long_name = NULL_IF_CONFIG_SMALL("ALAC (Apple Lossless Audio Codec)"), yading@10: };