yading@10: /*
yading@10:  * Copyright (C) 2008 David Conrad
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: #include <speex/speex.h>
yading@10: #include <speex/speex_header.h>
yading@10: #include <speex/speex_stereo.h>
yading@10: #include <speex/speex_callbacks.h>
yading@10: 
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "libavutil/common.h"
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: 
yading@10: typedef struct {
yading@10:     SpeexBits bits;
yading@10:     SpeexStereoState stereo;
yading@10:     void *dec_state;
yading@10:     int frame_size;
yading@10: } LibSpeexContext;
yading@10: 
yading@10: 
yading@10: static av_cold int libspeex_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     LibSpeexContext *s = avctx->priv_data;
yading@10:     const SpeexMode *mode;
yading@10:     SpeexHeader *header = NULL;
yading@10:     int spx_mode;
yading@10: 
yading@10:     avctx->sample_fmt = AV_SAMPLE_FMT_S16;
yading@10:     if (avctx->extradata && avctx->extradata_size >= 80) {
yading@10:         header = speex_packet_to_header(avctx->extradata,
yading@10:                                         avctx->extradata_size);
yading@10:         if (!header)
yading@10:             av_log(avctx, AV_LOG_WARNING, "Invalid Speex header\n");
yading@10:     }
yading@10:     if (avctx->codec_tag == MKTAG('S', 'P', 'X', 'N')) {
yading@10:         if (!avctx->extradata || avctx->extradata && avctx->extradata_size < 47) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Missing or invalid extradata.\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         if (avctx->extradata[37] != 10) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Unsupported quality mode.\n");
yading@10:             return AVERROR_PATCHWELCOME;
yading@10:         }
yading@10:         spx_mode           = 0;
yading@10:     } else if (header) {
yading@10:         avctx->sample_rate = header->rate;
yading@10:         avctx->channels    = header->nb_channels;
yading@10:         spx_mode           = header->mode;
yading@10:         speex_header_free(header);
yading@10:     } else {
yading@10:         switch (avctx->sample_rate) {
yading@10:         case 8000:  spx_mode = 0; break;
yading@10:         case 16000: spx_mode = 1; break;
yading@10:         case 32000: spx_mode = 2; break;
yading@10:         default:
yading@10:             /* libspeex can handle any mode if initialized as ultra-wideband */
yading@10:             av_log(avctx, AV_LOG_WARNING, "Invalid sample rate: %d\n"
yading@10:                                           "Decoding as 32kHz ultra-wideband\n",
yading@10:                                           avctx->sample_rate);
yading@10:             spx_mode = 2;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     mode = speex_lib_get_mode(spx_mode);
yading@10:     if (!mode) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", spx_mode);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     s->frame_size      =  160 << spx_mode;
yading@10:     if (!avctx->sample_rate)
yading@10:         avctx->sample_rate = 8000 << spx_mode;
yading@10: 
yading@10:     if (avctx->channels < 1 || avctx->channels > 2) {
yading@10:         /* libspeex can handle mono or stereo if initialized as stereo */
yading@10:         av_log(avctx, AV_LOG_ERROR, "Invalid channel count: %d.\n"
yading@10:                                     "Decoding as stereo.\n", avctx->channels);
yading@10:         avctx->channels = 2;
yading@10:     }
yading@10:     avctx->channel_layout = avctx->channels == 2 ? AV_CH_LAYOUT_STEREO :
yading@10:                                                    AV_CH_LAYOUT_MONO;
yading@10: 
yading@10:     speex_bits_init(&s->bits);
yading@10:     s->dec_state = speex_decoder_init(mode);
yading@10:     if (!s->dec_state) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder.\n");
yading@10:         return -1;
yading@10:     }
yading@10: 
yading@10:     if (avctx->channels == 2) {
yading@10:         SpeexCallback callback;
yading@10:         callback.callback_id = SPEEX_INBAND_STEREO;
yading@10:         callback.func = speex_std_stereo_request_handler;
yading@10:         callback.data = &s->stereo;
yading@10:         s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT;
yading@10:         speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback);
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int libspeex_decode_frame(AVCodecContext *avctx, void *data,
yading@10:                                  int *got_frame_ptr, AVPacket *avpkt)
yading@10: {
yading@10:     uint8_t *buf = avpkt->data;
yading@10:     int buf_size = avpkt->size;
yading@10:     LibSpeexContext *s = avctx->priv_data;
yading@10:     AVFrame *frame     = data;
yading@10:     int16_t *output;
yading@10:     int ret, consumed = 0;
yading@10: 
yading@10:     /* get output buffer */
yading@10:     frame->nb_samples = s->frame_size;
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10:     output = (int16_t *)frame->data[0];
yading@10: 
yading@10:     /* if there is not enough data left for the smallest possible frame or the
yading@10:        next 5 bits are a terminator code, reset the libspeex buffer using the
yading@10:        current packet, otherwise ignore the current packet and keep decoding
yading@10:        frames from the libspeex buffer. */
yading@10:     if (speex_bits_remaining(&s->bits) < 5 ||
yading@10:         speex_bits_peek_unsigned(&s->bits, 5) == 0xF) {
yading@10:         /* check for flush packet */
yading@10:         if (!buf || !buf_size) {
yading@10:             *got_frame_ptr = 0;
yading@10:             return buf_size;
yading@10:         }
yading@10:         /* set new buffer */
yading@10:         speex_bits_read_from(&s->bits, buf, buf_size);
yading@10:         consumed = buf_size;
yading@10:     }
yading@10: 
yading@10:     /* decode a single frame */
yading@10:     ret = speex_decode_int(s->dec_state, &s->bits, output);
yading@10:     if (ret <= -2) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Error decoding Speex frame.\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if (avctx->channels == 2)
yading@10:         speex_decode_stereo_int(output, s->frame_size, &s->stereo);
yading@10: 
yading@10:     *got_frame_ptr = 1;
yading@10: 
yading@10:     return consumed;
yading@10: }
yading@10: 
yading@10: static av_cold int libspeex_decode_close(AVCodecContext *avctx)
yading@10: {
yading@10:     LibSpeexContext *s = avctx->priv_data;
yading@10: 
yading@10:     speex_bits_destroy(&s->bits);
yading@10:     speex_decoder_destroy(s->dec_state);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold void libspeex_decode_flush(AVCodecContext *avctx)
yading@10: {
yading@10:     LibSpeexContext *s = avctx->priv_data;
yading@10:     speex_bits_reset(&s->bits);
yading@10: }
yading@10: 
yading@10: AVCodec ff_libspeex_decoder = {
yading@10:     .name           = "libspeex",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_SPEEX,
yading@10:     .priv_data_size = sizeof(LibSpeexContext),
yading@10:     .init           = libspeex_decode_init,
yading@10:     .close          = libspeex_decode_close,
yading@10:     .decode         = libspeex_decode_frame,
yading@10:     .flush          = libspeex_decode_flush,
yading@10:     .capabilities   = CODEC_CAP_SUBFRAMES | CODEC_CAP_DELAY | CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("libspeex Speex"),
yading@10: };