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#include "libavutil/attributes.h" |
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#include "libavutil/channel_layout.h" |
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#include "avformat.h" |
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#include "internal.h" |
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static const uint8_t frame_size[4] = { 24, 20, 4, 1 }; |
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static av_cold int g723_1_init(AVFormatContext *s) |
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{ |
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AVStream *st; |
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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_G723_1; |
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st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; |
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st->codecpar->sample_rate = 8000; |
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avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
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st->start_time = 0; |
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return 0; |
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} |
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static int g723_1_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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int size, byte, ret; |
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pkt->pos = avio_tell(s->pb); |
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byte = avio_r8(s->pb); |
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size = frame_size[byte & 3]; |
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ret = av_new_packet(pkt, size); |
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if (ret < 0) |
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return ret; |
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pkt->data[0] = byte; |
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pkt->duration = 240; |
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pkt->stream_index = 0; |
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ret = avio_read(s->pb, pkt->data + 1, size - 1); |
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if (ret < size - 1) { |
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return ret < 0 ? ret : AVERROR_EOF; |
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} |
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return pkt->size; |
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} |
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const AVInputFormat ff_g723_1_demuxer = { |
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.name = "g723_1", |
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.long_name = NULL_IF_CONFIG_SMALL("G.723.1"), |
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.read_header = g723_1_init, |
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.read_packet = g723_1_read_packet, |
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.extensions = "tco,rco,g723_1", |
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.flags = AVFMT_GENERIC_INDEX |
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}; |
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