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1d9569f9e8
* qatar/master: (23 commits) aacenc: Fix identification padding when the bitstream is already aligned. aacenc: Write correct length for long identification strings. aud: remove unneeded field, audio_stream_index from context aud: fix time stamp calculation for ADPCM IMA WS aud: simplify header parsing aud: set pts_wrap_bits to 64. cosmetics: indentation aud: support Westwood SND1 audio in AUD files. adpcm_ima_ws: fix stereo decoding avcodec: add a new codec_id for CRYO APC IMA ADPCM. vqa: remove unused context fields, audio_samplerate and audio_bits vqa: clean up audio header parsing vqa: set time base to frame rate as coded in the header. vqa: set packet duration. vqa: use 1/sample_rate as the audio stream time base vqa: set stream start_time to 0. lavc: postpone the removal of AVCodecContext.request_channels. lavf: postpone removing av_close_input_file(). lavc: postpone removing old audio encoding and decoding API avplay: remove the -er option. ... Conflicts: Changelog libavcodec/version.h libavdevice/v4l.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
/*
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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 <string.h>
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#include "avformat.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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AVIOContext *pb = s->pb;
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AVStream *st;
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avio_rl32(pb); /* CRYO */
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avio_rl32(pb); /* _APC */
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avio_rl32(pb); /* 1.20 */
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_ADPCM_IMA_APC;
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avio_rl32(pb); /* number of samples */
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st->codec->sample_rate = avio_rl32(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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avio_read(pb, st->codec->extradata, 2 * 4);
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st->codec->channels = 1;
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if (avio_rl32(pb))
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st->codec->channels = 2;
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st->codec->bits_per_coded_sample = 4;
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st->codec->bit_rate = st->codec->bits_per_coded_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 ff_apc_demuxer = {
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.name = "apc",
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.long_name = NULL_IF_CONFIG_SMALL("CRYO APC format"),
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.read_probe = apc_probe,
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.read_header = apc_read_header,
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.read_packet = apc_read_packet,
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};
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