0,0 → 1,103 |
/* |
* G.729 raw format demuxer |
* Copyright (c) 2011 Vladimir Voroshilov |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
#include "avformat.h" |
#include "internal.h" |
#include "libavutil/log.h" |
#include "libavutil/opt.h" |
|
typedef struct G729DemuxerContext { |
AVClass *class; |
int bit_rate; |
} G729DemuxerContext; |
|
static int g729_read_header(AVFormatContext *s) |
{ |
AVStream* st; |
G729DemuxerContext *s1 = s->priv_data; |
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st = avformat_new_stream(s, NULL); |
if (!st) |
return AVERROR(ENOMEM); |
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
st->codec->codec_id = AV_CODEC_ID_G729; |
st->codec->sample_rate = 8000; |
st->codec->channels = 1; |
|
if (s1 && s1->bit_rate) { |
s->bit_rate = s1->bit_rate; |
} |
|
if (s->bit_rate == 0) { |
av_log(s, AV_LOG_DEBUG, "No bitrate specified. Assuming 8000 b/s\n"); |
s->bit_rate = 8000; |
} |
|
if (s->bit_rate == 6400) { |
st->codec->block_align = 8; |
} else if (s->bit_rate == 8000) { |
st->codec->block_align = 10; |
} else { |
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); |
return AVERROR_INVALIDDATA; |
} |
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avpriv_set_pts_info(st, st->codec->block_align << 3, 1, st->codec->sample_rate); |
return 0; |
} |
static int g729_read_packet(AVFormatContext *s, AVPacket *pkt) |
{ |
int ret; |
|
ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align); |
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pkt->stream_index = 0; |
if (ret < 0) |
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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static const AVOption g729_options[] = { |
{ "bit_rate", "", offsetof(G729DemuxerContext, bit_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_DECODING_PARAM }, |
{ NULL }, |
}; |
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static const AVClass g729_demuxer_class = { |
.class_name = "g729 demuxer", |
.item_name = av_default_item_name, |
.option = g729_options, |
.version = LIBAVUTIL_VERSION_INT, |
}; |
|
AVInputFormat ff_g729_demuxer = { |
.name = "g729", |
.long_name = NULL_IF_CONFIG_SMALL("G.729 raw format demuxer"), |
.priv_data_size = sizeof(G729DemuxerContext), |
.read_header = g729_read_header, |
.read_packet = g729_read_packet, |
.flags = AVFMT_GENERIC_INDEX, |
.extensions = "g729", |
.priv_class = &g729_demuxer_class, |
}; |