1/* 2 * G.723.1 demuxer 3 * Copyright (c) 2010 Mohamed Naufal Basheer 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22/** 23 * @file 24 * G.723.1 demuxer 25 */ 26 27#include "libavutil/attributes.h" 28#include "libavutil/channel_layout.h" 29#include "avformat.h" 30#include "internal.h" 31 32static const uint8_t frame_size[4] = { 24, 20, 4, 1 }; 33 34static av_cold int g723_1_init(AVFormatContext *s) 35{ 36 AVStream *st; 37 38 st = avformat_new_stream(s, NULL); 39 if (!st) 40 return AVERROR(ENOMEM); 41 42 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 43 st->codec->codec_id = AV_CODEC_ID_G723_1; 44 st->codec->channel_layout = AV_CH_LAYOUT_MONO; 45 st->codec->channels = 1; 46 st->codec->sample_rate = 8000; 47 48 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); 49 st->start_time = 0; 50 51 return 0; 52} 53 54static int g723_1_read_packet(AVFormatContext *s, AVPacket *pkt) 55{ 56 int size, byte, ret; 57 58 pkt->pos = avio_tell(s->pb); 59 byte = avio_r8(s->pb); 60 size = frame_size[byte & 3]; 61 62 ret = av_new_packet(pkt, size); 63 if (ret < 0) 64 return ret; 65 66 pkt->data[0] = byte; 67 pkt->duration = 240; 68 pkt->stream_index = 0; 69 70 ret = avio_read(s->pb, pkt->data + 1, size - 1); 71 if (ret < size - 1) { 72 av_free_packet(pkt); 73 return ret < 0 ? ret : AVERROR_EOF; 74 } 75 76 return pkt->size; 77} 78 79AVInputFormat ff_g723_1_demuxer = { 80 .name = "g723_1", 81 .long_name = NULL_IF_CONFIG_SMALL("G.723.1"), 82 .read_header = g723_1_init, 83 .read_packet = g723_1_read_packet, 84 .extensions = "tco,rco,g723_1", 85 .flags = AVFMT_GENERIC_INDEX 86}; 87