mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 19879 to svn://svn.ffmpeg.org/ffmpeg/trunkrelease/0.6
parent
2d423666c0
commit
5f14b56593
7 changed files with 476 additions and 0 deletions
@ -0,0 +1,58 @@ |
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/*
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* CAF common code |
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* Copyright (c) 2007 Justin Ruggles |
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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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/**
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* @file libavformat/caf.c |
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* CAF common code |
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*/ |
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#include "avformat.h" |
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#include "riff.h" |
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#include "caf.h" |
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/**
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* Known codec tags for CAF |
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*/ |
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const AVCodecTag ff_codec_caf_tags[] = { |
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{ CODEC_ID_AAC, MKBETAG('a','a','c',' ') }, |
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{ CODEC_ID_AC3, MKBETAG('a','c','-','3') }, |
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{ CODEC_ID_ALAC, MKBETAG('a','l','a','c') }, |
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/* FIXME: use DV demuxer, as done in MOV */ |
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/*{ CODEC_ID_DVAUDIO, MKBETAG('v','d','v','a') },*/ |
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/*{ CODEC_ID_DVAUDIO, MKBETAG('d','v','c','a') },*/ |
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{ CODEC_ID_ADPCM_IMA_QT, MKBETAG('i','m','a','4') }, |
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{ CODEC_ID_MACE3, MKBETAG('M','A','C','3') }, |
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{ CODEC_ID_MACE6, MKBETAG('M','A','C','6') }, |
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{ CODEC_ID_MP3, MKBETAG('.','m','p','3') }, |
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{ CODEC_ID_MP2, MKBETAG('.','m','p','2') }, |
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{ CODEC_ID_MP1, MKBETAG('.','m','p','1') }, |
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{ CODEC_ID_PCM_ALAW, MKBETAG('a','l','a','w') }, |
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{ CODEC_ID_PCM_MULAW, MKBETAG('u','l','a','w') }, |
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{ CODEC_ID_QCELP, MKBETAG('Q','c','l','p') }, |
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{ CODEC_ID_QDM2, MKBETAG('Q','D','M','2') }, |
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{ CODEC_ID_QDM2, MKBETAG('Q','D','M','C') }, |
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/* currently unsupported codecs */ |
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/*{ AC-3 over S/PDIF MKBETAG('c','a','c','3') },*/ |
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/*{ MPEG4CELP MKBETAG('c','e','l','p') },*/ |
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/*{ MPEG4HVXC MKBETAG('h','v','x','c') },*/ |
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/*{ MPEG4TwinVQ MKBETAG('t','w','v','q') },*/ |
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{ 0, 0 }, |
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}; |
@ -0,0 +1,34 @@ |
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/*
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* CAF common code |
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* Copyright (c) 2007 Justin Ruggles |
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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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/**
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* @file libavformat/caf.h |
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* CAF common code |
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*/ |
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#ifndef AVFORMAT_CAF_H |
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#define AVFORMAT_CAF_H |
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#include "avformat.h" |
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extern const AVCodecTag ff_codec_caf_tags[]; |
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#endif /* AVFORMAT_CAF_H */ |
@ -0,0 +1,379 @@ |
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/*
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* Core Audio Format demuxer |
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* Copyright (c) 2007 Justin Ruggles |
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* Copyright (c) 2009 Peter Ross |
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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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/**
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* @file libavformat/cafdec.c |
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* Core Audio Format demuxer |
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*/ |
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#include "avformat.h" |
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#include "riff.h" |
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#include "isom.h" |
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#include "libavutil/intreadwrite.h" |
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#include "caf.h" |
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typedef struct { |
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int bytes_per_packet; ///< bytes in a packet, or 0 if variable
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int frames_per_packet; ///< frames in a packet, or 0 if variable
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int64_t num_bytes; ///< total number of bytes in stream
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int64_t packet_cnt; ///< packet counter
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int64_t frame_cnt; ///< frame counter
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int64_t data_start; ///< data start position, in bytes
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int64_t data_size; ///< raw data size, in bytes
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} CaffContext; |
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static int probe(AVProbeData *p) |
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{ |
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if (AV_RB32(p->buf) == MKBETAG('c','a','f','f') && AV_RB16(&p->buf[4]) == 1) |
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return AVPROBE_SCORE_MAX; |
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return 0; |
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} |
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/** Read audio description chunk */ |
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static int read_desc_chunk(AVFormatContext *s) |
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{ |
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ByteIOContext *pb = s->pb; |
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CaffContext *caf = s->priv_data; |
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AVStream *st; |
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int flags; |
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/* new audio stream */ |
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st = av_new_stream(s, 0); |
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if (!st) |
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return AVERROR_NOMEM; |
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/* parse format description */ |
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st->codec->codec_type = CODEC_TYPE_AUDIO; |
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st->codec->sample_rate = av_int2dbl(get_be64(pb)); |
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st->codec->codec_tag = get_be32(pb); |
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flags = get_be32(pb); |
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caf->bytes_per_packet = get_be32(pb); |
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st->codec->block_align = caf->bytes_per_packet; |
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caf->frames_per_packet = get_be32(pb); |
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st->codec->channels = get_be32(pb); |
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st->codec->bits_per_coded_sample = get_be32(pb); |
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/* calculate bit rate for constant size packets */ |
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if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) { |
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st->codec->bit_rate = (uint64_t)st->codec->sample_rate * (uint64_t)caf->bytes_per_packet * 8 |
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/ (uint64_t)caf->frames_per_packet; |
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} else { |
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st->codec->bit_rate = 0; |
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} |
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/* determine codec */ |
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if (st->codec->codec_tag == MKBETAG('l','p','c','m')) |
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st->codec->codec_id = ff_mov_get_lpcm_codec_id(st->codec->bits_per_coded_sample, (flags ^ 0x2) | 0x4); |
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else |
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st->codec->codec_id = ff_codec_get_id(ff_codec_caf_tags, st->codec->codec_tag); |
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return 0; |
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} |
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/** Read magic cookie chunk */ |
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static int read_kuki_chunk(AVFormatContext *s, int64_t size) |
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{ |
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ByteIOContext *pb = s->pb; |
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AVStream *st = s->streams[0]; |
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if (size < 0 || size > INT_MAX - FF_INPUT_BUFFER_PADDING_SIZE) |
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return -1; |
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if (st->codec->codec_id == CODEC_ID_AAC) { |
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/* The magic cookie format for AAC is an mp4 esds atom.
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The lavc AAC decoder requires the data from the codec specific |
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description as extradata input. */ |
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int strt, skip; |
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MOVAtom atom; |
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strt = url_ftell(pb); |
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ff_mov_read_esds(s, pb, atom); |
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skip = size - (url_ftell(pb) - strt); |
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if (skip < 0 || !st->codec->extradata || |
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st->codec->codec_id != CODEC_ID_AAC) { |
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av_log(s, AV_LOG_ERROR, "invalid AAC magic cookie\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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url_fskip(pb, skip); |
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} else { |
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st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE); |
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if (!st->codec->extradata) |
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return AVERROR(ENOMEM); |
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get_buffer(pb, st->codec->extradata, size); |
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st->codec->extradata_size = size; |
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} |
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return 0; |
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} |
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/** Read packet table chunk */ |
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static int read_pakt_chunk(AVFormatContext *s, int64_t size) |
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{ |
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ByteIOContext *pb = s->pb; |
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AVStream *st = s->streams[0]; |
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CaffContext *caf = s->priv_data; |
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int64_t pos = 0, ccount; |
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int num_packets, i; |
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ccount = url_ftell(pb); |
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num_packets = get_be64(pb); |
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if (num_packets < 0 || INT32_MAX / sizeof(AVIndexEntry) < num_packets) |
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return AVERROR_INVALIDDATA; |
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st->nb_frames = get_be64(pb); /* valid frames */ |
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st->nb_frames += get_be32(pb); /* priming frames */ |
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st->nb_frames += get_be32(pb); /* remainder frames */ |
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st->duration = 0; |
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for (i = 0; i < num_packets; i++) { |
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av_add_index_entry(s->streams[0], pos, st->duration, 0, 0, AVINDEX_KEYFRAME); |
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pos += caf->bytes_per_packet ? caf->bytes_per_packet : ff_mp4_read_descr_len(pb); |
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st->duration += caf->frames_per_packet ? caf->frames_per_packet : ff_mp4_read_descr_len(pb); |
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} |
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if (url_ftell(pb) - ccount != size) { |
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av_log(s, AV_LOG_ERROR, "error reading packet table\n"); |
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return -1; |
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} |
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caf->num_bytes = pos; |
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return 0; |
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} |
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/** Read information chunk */ |
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static void read_info_chunk(AVFormatContext *s, int64_t size) |
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{ |
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ByteIOContext *pb = s->pb; |
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unsigned int i; |
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unsigned int nb_entries = get_be32(pb); |
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for (i = 0; i < nb_entries; i++) { |
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char key[32]; |
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char value[1024]; |
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get_strz(pb, key, sizeof(key)); |
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get_strz(pb, value, sizeof(value)); |
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av_metadata_set(&s->metadata, key, value); |
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} |
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} |
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static int read_header(AVFormatContext *s, |
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AVFormatParameters *ap) |
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{ |
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ByteIOContext *pb = s->pb; |
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CaffContext *caf = s->priv_data; |
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AVStream *st; |
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uint32_t tag = 0; |
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int found_data, ret; |
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int64_t size; |
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url_fskip(pb, 8); /* magic, version, file flags */ |
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/* audio description chunk */ |
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if (get_be32(pb) != MKBETAG('d','e','s','c')) { |
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av_log(s, AV_LOG_ERROR, "desc chunk not present\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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size = get_be64(pb); |
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if (size != 32) |
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return AVERROR_INVALIDDATA; |
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ret = read_desc_chunk(s); |
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if (ret) |
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return ret; |
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st = s->streams[0]; |
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/* parse each chunk */ |
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found_data = 0; |
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while (!url_feof(pb)) { |
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/* stop at data chunk if seeking is not supported or
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data chunk size is unknown */ |
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if (found_data && (caf->data_size < 0 || url_is_streamed(pb))) |
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break; |
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tag = get_be32(pb); |
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size = get_be64(pb); |
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if (url_feof(pb)) |
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break; |
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switch (tag) { |
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case MKBETAG('d','a','t','a'): |
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url_fskip(pb, 4); /* edit count */ |
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caf->data_start = url_ftell(pb); |
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caf->data_size = size < 0 ? -1 : size - 4; |
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if (caf->data_size > 0 && !url_is_streamed(pb)) |
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url_fskip(pb, caf->data_size); |
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found_data = 1; |
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break; |
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/* magic cookie chunk */ |
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case MKBETAG('k','u','k','i'): |
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if (read_kuki_chunk(s, size)) |
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return AVERROR_INVALIDDATA; |
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break; |
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/* packet table chunk */ |
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case MKBETAG('p','a','k','t'): |
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if (read_pakt_chunk(s, size)) |
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return AVERROR_INVALIDDATA; |
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break; |
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case MKBETAG('i','n','f','o'): |
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read_info_chunk(s, size); |
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break; |
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default: |
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#define _(x) ((x) >= ' ' ? (x) : ' ') |
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av_log(s, AV_LOG_WARNING, "skipping CAF chunk: %08X (%c%c%c%c)\n", |
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tag, _(tag>>24), _((tag>>16)&0xFF), _((tag>>8)&0xFF), _(tag&0xFF)); |
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#undef _ |
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case MKBETAG('f','r','e','e'): |
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if (size < 0) |
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return AVERROR_INVALIDDATA; |
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url_fskip(pb, size); |
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break; |
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} |
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} |
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if (!found_data) |
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return AVERROR_INVALIDDATA; |
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if (caf->bytes_per_packet > 0 && caf->frames_per_packet > 0) { |
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if (caf->data_size > 0) |
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st->nb_frames = (caf->data_size / caf->bytes_per_packet) * caf->frames_per_packet; |
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} else if (st->nb_index_entries) { |
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st->codec->bit_rate = st->codec->sample_rate * caf->data_size * 8 / |
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st->duration; |
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} else { |
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av_log(s, AV_LOG_ERROR, "Missing packet table. It is required when " |
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"block size or frame size are variable.\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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s->file_size = url_fsize(pb); |
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s->file_size = FFMAX(0, s->file_size); |
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av_set_pts_info(st, 64, 1, st->codec->sample_rate); |
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st->start_time = 0; |
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/* position the stream at the start of data */ |
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if (caf->data_size >= 0) |
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url_fseek(pb, caf->data_start, SEEK_SET); |
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return 0; |
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} |
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#define CAF_MAX_PKT_SIZE 4096 |
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static int read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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ByteIOContext *pb = s->pb; |
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AVStream *st = s->streams[0]; |
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CaffContext *caf = s->priv_data; |
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int res, pkt_size = 0, pkt_frames = 0; |
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int64_t left = CAF_MAX_PKT_SIZE; |
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if (url_feof(pb)) |
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return AVERROR_IO; |
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/* don't read past end of data chunk */ |
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if (caf->data_size > 0) { |
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left = (caf->data_start + caf->data_size) - url_ftell(pb); |
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if (left <= 0) |
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return AVERROR_IO; |
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} |
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pkt_frames = caf->frames_per_packet; |
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pkt_size = caf->bytes_per_packet; |
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if (pkt_size > 0 && pkt_frames == 1) { |
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pkt_size = (CAF_MAX_PKT_SIZE / pkt_size) * pkt_size; |
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pkt_size = FFMIN(pkt_size, left); |
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pkt_frames = pkt_size / caf->bytes_per_packet; |
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} else if (st->nb_index_entries) { |
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if (caf->packet_cnt < st->nb_index_entries - 1) { |
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pkt_size = st->index_entries[caf->packet_cnt + 1].pos - st->index_entries[caf->packet_cnt].pos; |
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pkt_frames = st->index_entries[caf->packet_cnt + 1].timestamp - st->index_entries[caf->packet_cnt].timestamp; |
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} else if (caf->packet_cnt == st->nb_index_entries - 1) { |
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pkt_size = caf->num_bytes - st->index_entries[caf->packet_cnt].pos; |
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pkt_frames = st->duration - st->index_entries[caf->packet_cnt].timestamp; |
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} else { |
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return AVERROR_IO; |
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} |
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} |
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if (pkt_size == 0 || pkt_frames == 0 || pkt_size > left) |
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return AVERROR_IO; |
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res = av_get_packet(pb, pkt, pkt_size); |
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if (res < 0) |
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return res; |
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pkt->size = res; |
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pkt->stream_index = 0; |
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pkt->dts = pkt->pts = caf->frame_cnt; |
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caf->packet_cnt++; |
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caf->frame_cnt += pkt_frames; |
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return 0; |
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} |
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static int read_seek(AVFormatContext *s, int stream_index, |
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int64_t timestamp, int flags) |
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{ |
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AVStream *st = s->streams[0]; |
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CaffContext *caf = s->priv_data; |
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int64_t pos; |
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timestamp = FFMAX(timestamp, 0); |
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if (caf->frames_per_packet > 0 && caf->bytes_per_packet > 0) { |
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/* calculate new byte position based on target frame position */ |
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pos = caf->bytes_per_packet * timestamp / caf->frames_per_packet; |
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if (caf->data_size > 0) |
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pos = FFMIN(pos, caf->data_size); |
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caf->packet_cnt = pos / caf->bytes_per_packet; |
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caf->frame_cnt = caf->frames_per_packet * caf->packet_cnt; |
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} else if (st->nb_index_entries) { |
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caf->packet_cnt = av_index_search_timestamp(st, timestamp, flags); |
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caf->frame_cnt = st->index_entries[caf->packet_cnt].timestamp; |
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pos = st->index_entries[caf->packet_cnt].pos; |
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} else { |
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return -1; |
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} |
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|
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url_fseek(s->pb, pos + caf->data_start, SEEK_SET); |
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return 0; |
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} |
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|
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AVInputFormat caf_demuxer = { |
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"caf", |
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NULL_IF_CONFIG_SMALL("Apple Core Audio Format"), |
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sizeof(CaffContext), |
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probe, |
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read_header, |
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read_packet, |
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NULL, |
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read_seek, |
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.codec_tag = (const AVCodecTag*[]){ff_codec_caf_tags, 0}, |
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}; |
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