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ffmpeg/libavformat/aiffdec.c

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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/intfloat_readwrite.h"
#include "avformat.h"
#include "pcm.h"
#include "aiff.h"
#define AIFF 0
#define AIFF_C_VERSION1 0xA2805140
typedef struct {
int64_t data_end;
} AIFFInputContext;
static enum CodecID aiff_codec_get_id(int bps)
{
if (bps <= 8)
return CODEC_ID_PCM_S8;
if (bps <= 16)
return CODEC_ID_PCM_S16BE;
if (bps <= 24)
return CODEC_ID_PCM_S24BE;
if (bps <= 32)
return CODEC_ID_PCM_S32BE;
/* bigger than 32 isn't allowed */
return CODEC_ID_NONE;
}
/* returns the size of the found tag */
static int get_tag(ByteIOContext *pb, uint32_t * tag)
{
int size;
if (url_feof(pb))
return AVERROR(EIO);
*tag = get_le32(pb);
size = get_be32(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);
int res;
if (!str) {
url_fskip(s->pb, size);
return;
}
res = get_buffer(s->pb, str, size);
if (res < 0)
return;
str[res] = 0;
av_metadata_set2(&s->metadata, key, str, AV_METADATA_DONT_STRDUP_VAL);
}
/* Returns the number of sound data frames or negative on error */
static unsigned int get_aiff_header(ByteIOContext *pb, AVCodecContext *codec,
int size, unsigned version)
{
AVExtFloat ext;
double sample_rate;
unsigned int num_frames;
if (size & 1)
size++;
codec->codec_type = AVMEDIA_TYPE_AUDIO;
codec->channels = get_be16(pb);
num_frames = get_be32(pb);
codec->bits_per_coded_sample = get_be16(pb);
get_buffer(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */
sample_rate = av_ext2dbl(ext); /* 80 bits BE IEEE extended float */
codec->sample_rate = sample_rate;
size -= 18;
/* Got an AIFF-C? */
if (version == AIFF_C_VERSION1) {
codec->codec_tag = get_le32(pb);
codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
switch (codec->codec_id) {
case CODEC_ID_PCM_S16BE:
codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
break;
case CODEC_ID_ADPCM_IMA_QT:
codec->block_align = 34*codec->channels;
codec->frame_size = 64;
break;
case CODEC_ID_MACE3:
codec->block_align = 2*codec->channels;
codec->frame_size = 6;
break;
case CODEC_ID_MACE6:
codec->block_align = 1*codec->channels;
codec->frame_size = 6;
break;
case CODEC_ID_GSM:
codec->block_align = 33;
codec->frame_size = 160;
break;
case CODEC_ID_QCELP:
codec->block_align = 35;
codec->frame_size= 160;
break;
default:
break;
}
size -= 4;
} else {
/* Need the codec type */
codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
}
/* Block align needs to be computed in all cases, as the definition
* is specific to applications -> here we use the WAVE format definition */
if (!codec->block_align)
codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;
codec->bit_rate = (codec->frame_size ? codec->sample_rate/codec->frame_size :
codec->sample_rate) * (codec->block_align << 3);
/* Chunk is over */
if (size)
url_fseek(pb, size, SEEK_CUR);
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,
AVFormatParameters *ap)
{
int size, filesize;
int64_t offset = 0;
uint32_t tag;
unsigned version = AIFF_C_VERSION1;
ByteIOContext *pb = s->pb;
AVStream * st;
AIFFInputContext *aiff = s->priv_data;
/* check FORM header */
filesize = get_tag(pb, &tag);
if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
return AVERROR_INVALIDDATA;
/* AIFF data type */
tag = get_le32(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 = av_new_stream(s, 0);
if (!st)
return AVERROR(ENOMEM);
while (filesize > 0) {
/* parse different chunks */
size = get_tag(pb, &tag);
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(pb, st->codec, size, version);
if (st->nb_frames < 0)
return st->nb_frames;
if (offset > 0) // COMM is after SSND
goto got_sound;
break;
case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
version = get_be32(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 = url_ftell(pb) + size;
offset = get_be32(pb); /* Offset of sound data */
get_be32(pb); /* BlockSize... don't care */
offset += url_ftell(pb); /* Compute absolute data offset */
if (st->codec->block_align) /* Assume COMM already parsed */
goto got_sound;
if (url_is_streamed(pb)) {
av_log(s, AV_LOG_ERROR, "file is not seekable\n");
return -1;
}
url_fskip(pb, size - 8);
break;
case MKTAG('w', 'a', 'v', 'e'):
if ((uint64_t)size > (1<<30))
return -1;
st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!st->codec->extradata)
return AVERROR(ENOMEM);
st->codec->extradata_size = size;
get_buffer(pb, st->codec->extradata, size);
break;
default: /* Jump */
if (size & 1) /* Always even aligned */
size++;
url_fskip (pb, size);
}
}
if (!st->codec->block_align) {
av_log(s, AV_LOG_ERROR, "could not find COMM tag\n");
return -1;
}
got_sound:
/* Now positioned, get the sound data start and end */
if (st->nb_frames)
s->file_size = st->nb_frames * st->codec->block_align;
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
st->start_time = 0;
st->duration = st->codec->frame_size ?
st->nb_frames * st->codec->frame_size : st->nb_frames;
/* Position the stream at the first block */
url_fseek(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 - url_ftell(s->pb);
if (max_size <= 0)
return AVERROR_EOF;
/* Now for that packet */
if (st->codec->block_align >= 33) // GSM, QCLP, IMA4
size = st->codec->block_align;
else
size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
size = FFMIN(max_size, size);
res = av_get_packet(s->pb, pkt, size);
if (res < 0)
return res;
/* Only one stream in an AIFF file */
pkt->stream_index = 0;
return 0;
}
AVInputFormat aiff_demuxer = {
"aiff",
NULL_IF_CONFIG_SMALL("Audio IFF"),
sizeof(AIFFInputContext),
aiff_probe,
aiff_read_header,
aiff_read_packet,
NULL,
pcm_read_seek,
.codec_tag= (const AVCodecTag* const []){ff_codec_aiff_tags, 0},
};
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