86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
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/*
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* G.723.1 demuxer
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* Copyright (c) 2010 Mohamed Naufal Basheer
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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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/**
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* @file
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* G.723.1 demuxer
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*/
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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->channel_layout = AV_CH_LAYOUT_MONO;
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st->codecpar->channels = 1;
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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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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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