/* * CRYO APC audio format demuxer * Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com> * * 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 */ #include <string.h> #include "libavutil/channel_layout.h" #include "avformat.h" #include "internal.h" static int apc_probe(AVProbeData *p) { if (!strncmp(p->buf, "CRYO_APC", 8)) return AVPROBE_SCORE_MAX; return 0; } static int apc_read_header(AVFormatContext *s) { AVIOContext *pb = s->pb; AVStream *st; avio_rl32(pb); /* CRYO */ avio_rl32(pb); /* _APC */ avio_rl32(pb); /* 1.20 */ 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_ADPCM_IMA_APC; avio_rl32(pb); /* number of samples */ st->codecpar->sample_rate = avio_rl32(pb); /* initial predictor values for adpcm decoder */ if (ff_get_extradata(s, st->codecpar, pb, 2 * 4) < 0) return AVERROR(ENOMEM); if (avio_rl32(pb)) { st->codecpar->channels = 2; st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO; } else { st->codecpar->channels = 1; st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; } st->codecpar->bits_per_coded_sample = 4; st->codecpar->bit_rate = (int64_t)st->codecpar->bits_per_coded_sample * st->codecpar->channels * st->codecpar->sample_rate; st->codecpar->block_align = 1; return 0; } #define MAX_READ_SIZE 4096 static int apc_read_packet(AVFormatContext *s, AVPacket *pkt) { if (av_get_packet(s->pb, pkt, MAX_READ_SIZE) <= 0) return AVERROR(EIO); pkt->flags &= ~AV_PKT_FLAG_CORRUPT; pkt->stream_index = 0; return 0; } AVInputFormat ff_apc_demuxer = { .name = "apc", .long_name = NULL_IF_CONFIG_SMALL("CRYO APC"), .read_probe = apc_probe, .read_header = apc_read_header, .read_packet = apc_read_packet, };