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