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https://github.com/FFmpeg/FFmpeg.git
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104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/*
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* G.729 raw format demuxer
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* Copyright (c) 2011 Vladimir Voroshilov
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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 "avformat.h"
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#include "internal.h"
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#include "libavutil/log.h"
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#include "libavutil/opt.h"
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typedef struct G729DemuxerContext {
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AVClass *class;
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int bit_rate;
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} G729DemuxerContext;
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static int g729_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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AVStream* st;
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G729DemuxerContext *s1 = s->priv_data;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_G729;
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st->codec->sample_rate = 8000;
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st->codec->channels = 1;
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if (s1 && s1->bit_rate) {
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s->bit_rate = s1->bit_rate;
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}
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if (s->bit_rate == 0) {
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av_log(s, AV_LOG_DEBUG, "No bitrate specified. Assuming 8000 b/s\n");
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s->bit_rate = 8000;
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}
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if (s->bit_rate == 6400) {
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st->codec->block_align = 8;
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} else if (s->bit_rate == 8000) {
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st->codec->block_align = 10;
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} else {
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av_log(s, AV_LOG_ERROR, "Only 8000 b/s and 6400 b/s bitrates are supported. Provided: %d b/s\n", s->bit_rate);
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return AVERROR_INVALIDDATA;
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}
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avpriv_set_pts_info(st, st->codec->block_align << 3, 1, st->codec->sample_rate);
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return 0;
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}
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static int g729_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret;
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ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align);
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pkt->stream_index = 0;
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if (ret < 0)
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return ret;
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pkt->dts = pkt->pts = pkt->pos / s->streams[0]->codec->block_align;
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return ret;
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}
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static const AVOption g729_options[] = {
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{ "bit_rate", "", offsetof(G729DemuxerContext, bit_rate), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM },
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{ NULL },
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};
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static const AVClass g729_demuxer_class = {
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.class_name = "g729 demuxer",
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.item_name = av_default_item_name,
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.option = g729_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVInputFormat ff_g729_demuxer = {
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.name = "g729",
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.long_name = NULL_IF_CONFIG_SMALL("G.729 raw format demuxer"),
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.priv_data_size = sizeof(G729DemuxerContext),
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.read_header = g729_read_header,
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.read_packet = g729_read_packet,
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.flags = AVFMT_GENERIC_INDEX,
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.extensions = "g729",
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.priv_class = &g729_demuxer_class,
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};
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