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90 lines
2.4 KiB
90 lines
2.4 KiB
/* |
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* CRYO APC audio format demuxer |
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* Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com> |
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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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#include "avformat.h" |
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#include "string.h" |
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static int apc_probe(AVProbeData *p) |
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{ |
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if (!strncmp(p->buf, "CRYO_APC", 8)) |
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return AVPROBE_SCORE_MAX; |
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return 0; |
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} |
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static int apc_read_header(AVFormatContext *s, AVFormatParameters *ap) |
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{ |
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ByteIOContext *pb = s->pb; |
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AVStream *st; |
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get_le32(pb); /* CRYO */ |
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get_le32(pb); /* _APC */ |
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get_le32(pb); /* 1.20 */ |
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st = av_new_stream(s, 0); |
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if (!st) |
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return AVERROR(ENOMEM); |
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st->codec->codec_type = CODEC_TYPE_AUDIO; |
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st->codec->codec_id = CODEC_ID_ADPCM_IMA_WS; |
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get_le32(pb); /* number of samples */ |
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st->codec->sample_rate = get_le32(pb); |
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st->codec->extradata_size = 2 * 4; |
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st->codec->extradata = av_malloc(st->codec->extradata_size + |
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FF_INPUT_BUFFER_PADDING_SIZE); |
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if (!st->codec->extradata) |
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return AVERROR(ENOMEM); |
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/* initial predictor values for adpcm decoder */ |
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get_buffer(pb, st->codec->extradata, 2 * 4); |
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st->codec->channels = 1; |
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if (get_le32(pb)) |
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st->codec->channels = 2; |
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st->codec->bits_per_sample = 4; |
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st->codec->bit_rate = st->codec->bits_per_sample * st->codec->channels |
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* st->codec->sample_rate; |
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st->codec->block_align = 1; |
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return 0; |
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} |
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#define MAX_READ_SIZE 4096 |
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static int apc_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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if (av_get_packet(s->pb, pkt, MAX_READ_SIZE) <= 0) |
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return AVERROR(EIO); |
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pkt->stream_index = 0; |
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return 0; |
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} |
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AVInputFormat apc_demuxer = { |
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"apc", |
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"CRYO APC format", |
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0, |
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apc_probe, |
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apc_read_header, |
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apc_read_packet, |
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};
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