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ffmpeg/libavformat/aiffdec.c
Eduard Sinelnikov 7fcbebbeaf avformat/aiffdec: AIFF fix in case of ANNO 
Apple's AIFF protocol clearly states that each chucnk which is odd sized a padding should be added.
In the old version of aiffdec adding of padding was done in `get_meta`. And in case of unknown chunk name it was done in defalut case.
The new version has deleted the padding in default case and added padding adding after the switch.
But the new version didn't removed the padding adding in the `get_meta` function so in some cases padding was added twice which leaded to a bug.

Fixes: sample.aiff

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2018-01-11 03:29:25 +01:00

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/*
* AIFF/AIFF-C demuxer
* Copyright (c) 2006 Patrick Guimond
*
* 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 "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "internal.h"
#include "pcm.h"
#include "aiff.h"
#include "isom.h"
#include "id3v2.h"
#include "mov_chan.h"
#define AIFF 0
#define AIFF_C_VERSION1 0xA2805140
typedef struct AIFFInputContext {
int64_t data_end;
int block_duration;
} AIFFInputContext;
static enum AVCodecID aiff_codec_get_id(int bps)
{
if (bps <= 8)
return AV_CODEC_ID_PCM_S8;
if (bps <= 16)
return AV_CODEC_ID_PCM_S16BE;
if (bps <= 24)
return AV_CODEC_ID_PCM_S24BE;
if (bps <= 32)
return AV_CODEC_ID_PCM_S32BE;
/* bigger than 32 isn't allowed */
return AV_CODEC_ID_NONE;
}
/* returns the size of the found tag */
static int get_tag(AVIOContext *pb, uint32_t * tag)
{
int size;
if (avio_feof(pb))
return AVERROR(EIO);
*tag = avio_rl32(pb);
size = avio_rb32(pb);
if (size < 0)
size = 0x7fffffff;
return size;
}
/* Metadata string read */
static void get_meta(AVFormatContext *s, const char *key, int size)
{
uint8_t *str = av_malloc(size+1);
if (str) {
int res = avio_read(s->pb, str, size);
if (res < 0){
av_free(str);
return;
}
size -= res;
str[res] = 0;
av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
}
avio_skip(s->pb, size);
}
/* Returns the number of sound data frames or negative on error */
static int get_aiff_header(AVFormatContext *s, int size,
unsigned version)
{
AVIOContext *pb = s->pb;
AVCodecParameters *par = s->streams[0]->codecpar;
AIFFInputContext *aiff = s->priv_data;
int exp;
uint64_t val;
int sample_rate;
unsigned int num_frames;
if (size & 1)
size++;
par->codec_type = AVMEDIA_TYPE_AUDIO;
par->channels = avio_rb16(pb);
num_frames = avio_rb32(pb);
par->bits_per_coded_sample = avio_rb16(pb);
exp = avio_rb16(pb) - 16383 - 63;
val = avio_rb64(pb);
if (exp <-63 || exp >63) {
av_log(s, AV_LOG_ERROR, "exp %d is out of range\n", exp);
return AVERROR_INVALIDDATA;
}
if (exp >= 0)
sample_rate = val << exp;
else
sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;
par->sample_rate = sample_rate;
size -= 18;
/* get codec id for AIFF-C */
if (size < 4) {
version = AIFF;
} else if (version == AIFF_C_VERSION1) {
par->codec_tag = avio_rl32(pb);
par->codec_id = ff_codec_get_id(ff_codec_aiff_tags, par->codec_tag);
if (par->codec_id == AV_CODEC_ID_NONE)
avpriv_request_sample(s, "unknown or unsupported codec tag: %s",
av_fourcc2str(par->codec_tag));
size -= 4;
}
if (version != AIFF_C_VERSION1 || par->codec_id == AV_CODEC_ID_PCM_S16BE) {
par->codec_id = aiff_codec_get_id(par->bits_per_coded_sample);
par->bits_per_coded_sample = av_get_bits_per_sample(par->codec_id);
aiff->block_duration = 1;
} else {
switch (par->codec_id) {
case AV_CODEC_ID_PCM_F32BE:
case AV_CODEC_ID_PCM_F64BE:
case AV_CODEC_ID_PCM_S16LE:
case AV_CODEC_ID_PCM_ALAW:
case AV_CODEC_ID_PCM_MULAW:
aiff->block_duration = 1;
break;
case AV_CODEC_ID_ADPCM_IMA_QT:
par->block_align = 34 * par->channels;
break;
case AV_CODEC_ID_MACE3:
par->block_align = 2 * par->channels;
break;
case AV_CODEC_ID_ADPCM_G726LE:
par->bits_per_coded_sample = 5;
case AV_CODEC_ID_ADPCM_IMA_WS:
case AV_CODEC_ID_ADPCM_G722:
case AV_CODEC_ID_MACE6:
case AV_CODEC_ID_SDX2_DPCM:
par->block_align = 1 * par->channels;
break;
case AV_CODEC_ID_GSM:
par->block_align = 33;
break;
default:
aiff->block_duration = 1;
break;
}
if (par->block_align > 0)
aiff->block_duration = av_get_audio_frame_duration2(par,
par->block_align);
}
/* Block align needs to be computed in all cases, as the definition
* is specific to applications -> here we use the WAVE format definition */
if (!par->block_align)
par->block_align = (av_get_bits_per_sample(par->codec_id) * par->channels) >> 3;
if (aiff->block_duration) {
par->bit_rate = (int64_t)par->sample_rate * (par->block_align << 3) /
aiff->block_duration;
}
/* Chunk is over */
if (size)
avio_skip(pb, size);
return num_frames;
}
static int aiff_probe(AVProbeData *p)
{
/* check file header */
if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
p->buf[2] == 'R' && p->buf[3] == 'M' &&
p->buf[8] == 'A' && p->buf[9] == 'I' &&
p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
return AVPROBE_SCORE_MAX;
else
return 0;
}
/* aiff input */
static int aiff_read_header(AVFormatContext *s)
{
int ret, size, filesize;
int64_t offset = 0, position;
uint32_t tag;
unsigned version = AIFF_C_VERSION1;
AVIOContext *pb = s->pb;
AVStream * st;
AIFFInputContext *aiff = s->priv_data;
ID3v2ExtraMeta *id3v2_extra_meta = NULL;
/* check FORM header */
filesize = get_tag(pb, &tag);
if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
return AVERROR_INVALIDDATA;
/* AIFF data type */
tag = avio_rl32(pb);
if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
version = AIFF;
else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
return AVERROR_INVALIDDATA;
filesize -= 4;
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
while (filesize > 0) {
/* parse different chunks */
size = get_tag(pb, &tag);
if (size == AVERROR_EOF && offset > 0 && st->codecpar->block_align) {
av_log(s, AV_LOG_WARNING, "header parser hit EOF\n");
goto got_sound;
}
if (size < 0)
return size;
filesize -= size + 8;
switch (tag) {
case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
/* Then for the complete header info */
st->nb_frames = get_aiff_header(s, size, version);
if (st->nb_frames < 0)
return st->nb_frames;
if (offset > 0) // COMM is after SSND
goto got_sound;
break;
case MKTAG('I', 'D', '3', ' '):
position = avio_tell(pb);
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
if (id3v2_extra_meta)
if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0 ||
(ret = ff_id3v2_parse_chapters(s, &id3v2_extra_meta)) < 0) {
ff_id3v2_free_extra_meta(&id3v2_extra_meta);
return ret;
}
ff_id3v2_free_extra_meta(&id3v2_extra_meta);
if (position + size > avio_tell(pb))
avio_skip(pb, position + size - avio_tell(pb));
break;
case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
version = avio_rb32(pb);
break;
case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
get_meta(s, "title" , size);
break;
case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
get_meta(s, "author" , size);
break;
case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
get_meta(s, "copyright", size);
break;
case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
get_meta(s, "comment" , size);
break;
case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
aiff->data_end = avio_tell(pb) + size;
offset = avio_rb32(pb); /* Offset of sound data */
avio_rb32(pb); /* BlockSize... don't care */
offset += avio_tell(pb); /* Compute absolute data offset */
if (st->codecpar->block_align && !(pb->seekable & AVIO_SEEKABLE_NORMAL)) /* Assume COMM already parsed */
goto got_sound;
if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
av_log(s, AV_LOG_ERROR, "file is not seekable\n");
return -1;
}
avio_skip(pb, size - 8);
break;
case MKTAG('w', 'a', 'v', 'e'):
if ((uint64_t)size > (1<<30))
return -1;
if (ff_get_extradata(s, st->codecpar, pb, size) < 0)
return AVERROR(ENOMEM);
if ( (st->codecpar->codec_id == AV_CODEC_ID_QDMC || st->codecpar->codec_id == AV_CODEC_ID_QDM2)
&& size>=12*4 && !st->codecpar->block_align) {
st->codecpar->block_align = AV_RB32(st->codecpar->extradata+11*4);
aiff->block_duration = AV_RB32(st->codecpar->extradata+9*4);
} else if (st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
char rate = 0;
if (size >= 25)
rate = st->codecpar->extradata[24];
switch (rate) {
case 'H': // RATE_HALF
st->codecpar->block_align = 17;
break;
case 'F': // RATE_FULL
default:
st->codecpar->block_align = 35;
}
aiff->block_duration = 160;
st->codecpar->bit_rate = (int64_t)st->codecpar->sample_rate * (st->codecpar->block_align << 3) /
aiff->block_duration;
}
break;
case MKTAG('C','H','A','N'):
if(ff_mov_read_chan(s, pb, st, size) < 0)
return AVERROR_INVALIDDATA;
break;
case MKTAG('A','P','C','M'): /* XA ADPCM compressed sound chunk */
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_XA;
aiff->data_end = avio_tell(pb) + size;
offset = avio_tell(pb) + 8;
/* This field is unknown and its data seems to be irrelevant */
avio_rb32(pb);
st->codecpar->block_align = avio_rb32(pb);
goto got_sound;
break;
case 0:
if (offset > 0 && st->codecpar->block_align) // COMM && SSND
goto got_sound;
default: /* Jump */
avio_skip(pb, size);
}
/* Skip required padding byte for odd-sized chunks. */
if (size & 1) {
filesize--;
avio_skip(pb, 1);
}
}
got_sound:
if (!st->codecpar->block_align && st->codecpar->codec_id == AV_CODEC_ID_QCELP) {
av_log(s, AV_LOG_WARNING, "qcelp without wave chunk, assuming full rate\n");
st->codecpar->block_align = 35;
} else if (!st->codecpar->block_align) {
av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
return -1;
}
/* Now positioned, get the sound data start and end */
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
st->start_time = 0;
st->duration = st->nb_frames * aiff->block_duration;
/* Position the stream at the first block */
avio_seek(pb, offset, SEEK_SET);
return 0;
}
#define MAX_SIZE 4096
static int aiff_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
AVStream *st = s->streams[0];
AIFFInputContext *aiff = s->priv_data;
int64_t max_size;
int res, size;
/* calculate size of remaining data */
max_size = aiff->data_end - avio_tell(s->pb);
if (max_size <= 0)
return AVERROR_EOF;
if (!st->codecpar->block_align) {
av_log(s, AV_LOG_ERROR, "block_align not set\n");
return AVERROR_INVALIDDATA;
}
/* Now for that packet */
switch (st->codecpar->codec_id) {
case AV_CODEC_ID_ADPCM_IMA_QT:
case AV_CODEC_ID_GSM:
case AV_CODEC_ID_QDM2:
case AV_CODEC_ID_QCELP:
size = st->codecpar->block_align;
break;
default:
size = st->codecpar->block_align ? (MAX_SIZE / st->codecpar->block_align) * st->codecpar->block_align : MAX_SIZE;
}
size = FFMIN(max_size, size);
res = av_get_packet(s->pb, pkt, size);
if (res < 0)
return res;
if (size >= st->codecpar->block_align)
pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
/* Only one stream in an AIFF file */
pkt->stream_index = 0;
pkt->duration = (res / st->codecpar->block_align) * aiff->block_duration;
return 0;
}
AVInputFormat ff_aiff_demuxer = {
.name = "aiff",
.long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
.priv_data_size = sizeof(AIFFInputContext),
.read_probe = aiff_probe,
.read_header = aiff_read_header,
.read_packet = aiff_read_packet,
.read_seek = ff_pcm_read_seek,
.codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },
};
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