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#include "libavutil/log.h" |
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#include "libavutil/opt.h" |
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#include "avformat.h" |
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#include "internal.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) |
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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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codecpar->codec_id = AV_CODEC_ID_G729; |
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st->codecpar->sample_rate = 8000; |
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st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; |
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if (s1 && s1->bit_rate) |
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s->bit_rate = s1->bit_rate; |
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switch(s->bit_rate) { |
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case 6400: |
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st->codecpar->block_align = 8; |
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break; |
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case 8000: |
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st->codecpar->block_align = 10; |
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break; |
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default: |
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av_log(s, AV_LOG_ERROR, "Invalid bit_rate value %"PRId64". " |
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"Only 6400 and 8000 b/s are supported.", s->bit_rate); |
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return AVERROR(EINVAL); |
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} |
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avpriv_set_pts_info(st, 64, 80, st->codecpar->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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AVStream *st = s->streams[0]; |
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int ret = av_get_packet(s->pb, pkt, st->codecpar->block_align); |
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if (ret < 0) |
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return ret; |
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pkt->stream_index = 0; |
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pkt->dts = pkt->pts = pkt->pos / st->codecpar->block_align; |
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pkt->duration = 1; |
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return 0; |
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} |
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#define OFFSET(x) offsetof(G729DemuxerContext, x) |
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static const AVOption g729_options[] = { |
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{ "bit_rate", "", OFFSET(bit_rate), AV_OPT_TYPE_INT, { .i64 = 8000 }, 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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const 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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