yading@11: /* yading@11: * G.723.1 demuxer yading@11: * Copyright (c) 2010 Mohamed Naufal Basheer yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: /** yading@11: * @file yading@11: * G.723.1 demuxer yading@11: */ yading@11: yading@11: #include "libavutil/channel_layout.h" yading@11: #include "avformat.h" yading@11: #include "internal.h" yading@11: yading@11: static const uint8_t frame_size[4] = { 24, 20, 4, 1 }; yading@11: yading@11: static int g723_1_init(AVFormatContext *s) yading@11: { yading@11: AVStream *st; yading@11: yading@11: st = avformat_new_stream(s, NULL); yading@11: if (!st) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: st->codec->codec_type = AVMEDIA_TYPE_AUDIO; yading@11: st->codec->codec_id = AV_CODEC_ID_G723_1; yading@11: st->codec->channel_layout = AV_CH_LAYOUT_MONO; yading@11: st->codec->channels = 1; yading@11: st->codec->sample_rate = 8000; yading@11: yading@11: avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); yading@11: st->start_time = 0; yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: static int g723_1_read_packet(AVFormatContext *s, AVPacket *pkt) yading@11: { yading@11: int size, byte, ret; yading@11: yading@11: pkt->pos = avio_tell(s->pb); yading@11: byte = avio_r8(s->pb); yading@11: size = frame_size[byte & 3]; yading@11: yading@11: ret = av_new_packet(pkt, size); yading@11: if (ret < 0) yading@11: return ret; yading@11: yading@11: pkt->data[0] = byte; yading@11: pkt->duration = 240; yading@11: pkt->stream_index = 0; yading@11: yading@11: ret = avio_read(s->pb, pkt->data + 1, size - 1); yading@11: if (ret < size - 1) { yading@11: av_free_packet(pkt); yading@11: return ret < 0 ? ret : AVERROR_EOF; yading@11: } yading@11: yading@11: return pkt->size; yading@11: } yading@11: yading@11: AVInputFormat ff_g723_1_demuxer = { yading@11: .name = "g723_1", yading@11: .long_name = NULL_IF_CONFIG_SMALL("G.723.1"), yading@11: .read_header = g723_1_init, yading@11: .read_packet = g723_1_read_packet, yading@11: .extensions = "tco,rco,g723_1", yading@11: .flags = AVFMT_GENERIC_INDEX yading@11: };