mirror of
https://github.com/FFmpeg/FFmpeg.git
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145 lines
4.3 KiB
C
145 lines
4.3 KiB
C
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/*
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* Copyright (C) 2008 David Conrad
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include <speex/speex.h>
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#include <speex/speex_header.h>
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#include <speex/speex_stereo.h>
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#include <speex/speex_callbacks.h>
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typedef struct {
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SpeexBits bits;
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SpeexStereoState stereo;
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void *dec_state;
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SpeexHeader *header;
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} LibSpeexContext;
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static av_cold int libspeex_decode_init(AVCodecContext *avctx)
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{
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LibSpeexContext *s = avctx->priv_data;
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const SpeexMode *mode;
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// defaults in the case of a missing header
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if (avctx->sample_rate <= 8000)
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mode = &speex_nb_mode;
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else if (avctx->sample_rate <= 16000)
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mode = &speex_wb_mode;
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else
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mode = &speex_uwb_mode;
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if (avctx->extradata_size >= 80)
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s->header = speex_packet_to_header(avctx->extradata, avctx->extradata_size);
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avctx->sample_fmt = SAMPLE_FMT_S16;
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if (s->header) {
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avctx->sample_rate = s->header->rate;
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avctx->channels = s->header->nb_channels;
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avctx->frame_size = s->header->frame_size;
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mode = speex_lib_get_mode(s->header->mode);
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if (!mode) {
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av_log(avctx, AV_LOG_ERROR, "Unknown Speex mode %d", s->header->mode);
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return -1;
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}
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} else
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av_log(avctx, AV_LOG_INFO, "Missing speex header, assuming defaults\n");
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if (avctx->channels > 2) {
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av_log(avctx, AV_LOG_ERROR, "Only stereo and mono supported\n");
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return -1;
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}
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speex_bits_init(&s->bits);
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s->dec_state = speex_decoder_init(mode);
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if (!s->dec_state) {
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av_log(avctx, AV_LOG_ERROR, "Error initializing libspeex decoder\n");
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return -1;
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}
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if (!s->header)
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speex_decoder_ctl(s->dec_state, SPEEX_GET_FRAME_SIZE, &avctx->frame_size);
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if (avctx->channels == 2) {
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SpeexCallback callback;
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callback.callback_id = SPEEX_INBAND_STEREO;
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callback.func = speex_std_stereo_request_handler;
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callback.data = &s->stereo;
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s->stereo = (SpeexStereoState)SPEEX_STEREO_STATE_INIT;
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speex_decoder_ctl(s->dec_state, SPEEX_SET_HANDLER, &callback);
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}
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return 0;
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}
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static int libspeex_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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const uint8_t *buf, int buf_size)
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{
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LibSpeexContext *s = avctx->priv_data;
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int16_t *output = data, *end;
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int i, num_samples;
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num_samples = avctx->frame_size * avctx->channels;
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end = output + *data_size/2;
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speex_bits_read_from(&s->bits, buf, buf_size);
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for (i = 0; speex_bits_remaining(&s->bits) && output + num_samples < end; i++) {
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int ret = speex_decode_int(s->dec_state, &s->bits, output);
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if (ret <= -2) {
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av_log(avctx, AV_LOG_ERROR, "Error decoding speex frame\n");
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return -1;
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} else if (ret == -1)
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// end of stream
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break;
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if (avctx->channels == 2)
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speex_decode_stereo_int(output, avctx->frame_size, &s->stereo);
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output += num_samples;
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}
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*data_size = i * avctx->channels * avctx->frame_size * 2;
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return buf_size;
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}
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static av_cold int libspeex_decode_close(AVCodecContext *avctx)
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{
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LibSpeexContext *s = avctx->priv_data;
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speex_header_free(s->header);
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speex_bits_destroy(&s->bits);
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speex_decoder_destroy(s->dec_state);
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return 0;
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}
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AVCodec libspeex_decoder = {
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"libspeex",
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CODEC_TYPE_AUDIO,
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CODEC_ID_SPEEX,
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sizeof(LibSpeexContext),
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libspeex_decode_init,
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NULL,
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libspeex_decode_close,
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libspeex_decode_frame,
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.long_name = NULL_IF_CONFIG_SMALL("libspeex"),
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};
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