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ffmpeg/libavformat/aiff.c

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/*
* AIFF/AIFF-C muxer and 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 "avformat.h"
#include "allformats.h"
#include "riff.h"
#include "intfloat_readwrite.h"
const CodecTag codec_aiff_tags[] = {
{ CODEC_ID_PCM_S16BE, MKTAG('N','O','N','E') },
{ CODEC_ID_PCM_S8, MKTAG('N','O','N','E') },
{ CODEC_ID_PCM_S24BE, MKTAG('N','O','N','E') },
{ CODEC_ID_PCM_S32BE, MKTAG('N','O','N','E') },
{ CODEC_ID_PCM_ALAW, MKTAG('a','l','a','w') },
{ CODEC_ID_PCM_ALAW, MKTAG('A','L','A','W') },
{ CODEC_ID_PCM_MULAW, MKTAG('u','l','a','w') },
{ CODEC_ID_PCM_MULAW, MKTAG('U','L','A','W') },
{ CODEC_ID_MACE3, MKTAG('M','A','C','3') },
{ CODEC_ID_MACE6, MKTAG('M','A','C','6') },
{ CODEC_ID_GSM, MKTAG('G','S','M',' ') },
{ CODEC_ID_ADPCM_G726, MKTAG('G','7','2','6') },
{ 0, 0 },
};
#define AIFF 0
#define AIFF_C_VERSION1 0xA2805140
static int 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 0;
}
/* returns the size of the found tag */
static int get_tag(ByteIOContext *pb, uint32_t * tag)
{
int size;
if (url_feof(pb))
return AVERROR_IO;
*tag = get_le32(pb);
size = get_be32(pb);
if (size < 0)
size = 0x7fffffff;
return size;
}
/* Metadata string read */
static void get_meta(ByteIOContext *pb, char * str, int strsize, int size)
{
int res;
if (size > strsize-1)
res = get_buffer(pb, (uint8_t*)str, strsize-1);
else
res = get_buffer(pb, (uint8_t*)str, size);
if (res < 0)
return;
str[res] = 0;
if (size & 1)
size++;
size -= res;
if (size);
url_fskip(pb, size);
}
/* 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 = CODEC_TYPE_AUDIO;
codec->channels = get_be16(pb);
num_frames = get_be32(pb);
codec->bits_per_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 = codec_get_id (codec_aiff_tags, codec->codec_tag);
if (codec->codec_id == CODEC_ID_PCM_S16BE) {
codec->codec_id = aiff_codec_get_id (codec->bits_per_sample);
codec->bits_per_sample = av_get_bits_per_sample(codec->codec_id);
}
size -= 4;
} else {
/* Need the codec type */
codec->codec_id = aiff_codec_get_id (codec->bits_per_sample);
codec->bits_per_sample = av_get_bits_per_sample(codec->codec_id);
}
if (!codec->codec_id)
return AVERROR_INVALIDDATA;
/* Block align needs to be computed in all cases, as the definition
* is specific to applications -> here we use the WAVE format definition */
codec->block_align = (codec->bits_per_sample * codec->channels) >> 3;
codec->bit_rate = codec->sample_rate * (codec->block_align << 3);
/* Chunk is over */
if (size)
url_fseek(pb, size, SEEK_CUR);
return num_frames;
}
#ifdef CONFIG_MUXERS
typedef struct {
offset_t form;
offset_t frames;
offset_t ssnd;
} AIFFOutputContext;
static int aiff_write_header(AVFormatContext *s)
{
AIFFOutputContext *aiff = s->priv_data;
ByteIOContext *pb = &s->pb;
AVCodecContext *enc = s->streams[0]->codec;
AVExtFloat sample_rate;
/* First verify if format is ok */
enc->codec_tag = codec_get_tag(codec_aiff_tags, enc->codec_id);
if (!enc->codec_tag) {
av_free(aiff);
return -1;
}
/* FORM AIFF header */
put_tag(pb, "FORM");
aiff->form = url_ftell(pb);
put_be32(pb, 0); /* file length */
put_tag(pb, "AIFC");
/* Version chunk */
put_tag(pb, "FVER");
put_be32(pb, 4);
put_be32(pb, 0xA2805140);
/* Common chunk */
put_tag(pb, "COMM");
put_be32(pb, 24); /* size */
put_be16(pb, enc->channels); /* Number of channels */
aiff->frames = url_ftell(pb);
put_be32(pb, 0); /* Number of frames */
if (!enc->bits_per_sample)
enc->bits_per_sample = av_get_bits_per_sample(enc->codec_id);
if (!enc->bits_per_sample) {
av_log(s, AV_LOG_ERROR, "could not compute bits per sample\n");
return -1;
}
if (!enc->block_align)
enc->block_align = (enc->bits_per_sample * enc->channels) >> 3;
put_be16(pb, enc->bits_per_sample); /* Sample size */
sample_rate = av_dbl2ext((double)enc->sample_rate);
put_buffer(pb, (uint8_t*)&sample_rate, sizeof(sample_rate));
put_le32(pb, enc->codec_tag);
put_be16(pb, 0);
/* Sound data chunk */
put_tag(pb, "SSND");
aiff->ssnd = url_ftell(pb); /* Sound chunk size */
put_be32(pb, 0); /* Sound samples data size */
put_be32(pb, 0); /* Data offset */
put_be32(pb, 0); /* Block-size (block align) */
av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
/* Data is starting here */
put_flush_packet(pb);
return 0;
}
static int aiff_write_packet(AVFormatContext *s, AVPacket *pkt)
{
ByteIOContext *pb = &s->pb;
put_buffer(pb, pkt->data, pkt->size);
return 0;
}
static int aiff_write_trailer(AVFormatContext *s)
{
ByteIOContext *pb = &s->pb;
AIFFOutputContext *aiff = s->priv_data;
AVCodecContext *enc = s->streams[0]->codec;
/* Chunks sizes must be even */
offset_t file_size, end_size;
end_size = file_size = url_ftell(pb);
if (file_size & 1) {
put_byte(pb, 0);
end_size++;
}
if (!url_is_streamed(&s->pb)) {
/* File length */
url_fseek(pb, aiff->form, SEEK_SET);
put_be32(pb, (uint32_t)(file_size - aiff->form - 4));
/* Number of sample frames */
url_fseek(pb, aiff->frames, SEEK_SET);
put_be32(pb, ((uint32_t)(file_size-aiff->ssnd-12))/enc->block_align);
/* Sound Data chunk size */
url_fseek(pb, aiff->ssnd, SEEK_SET);
put_be32(pb, (uint32_t)(file_size - aiff->ssnd - 4));
/* return to the end */
url_fseek(pb, end_size, SEEK_SET);
put_flush_packet(pb);
}
return 0;
}
#endif //CONFIG_MUXERS
static int aiff_probe(AVProbeData *p)
{
/* check file header */
if (p->buf_size < 16)
return 0;
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, offset;
uint32_t tag;
unsigned version = AIFF_C_VERSION1;
ByteIOContext *pb = &s->pb;
AVStream * st = s->streams[0];
/* 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_NOMEM;
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;
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 (pb, s->title, sizeof(s->title), size);
break;
case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
get_meta (pb, s->author, sizeof(s->author), size);
break;
case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
get_meta (pb, s->copyright, sizeof(s->copyright), size);
break;
case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
get_meta (pb, s->comment, sizeof(s->comment), size);
break;
case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
get_be32(pb); /* Block align... don't care */
offset = get_be32(pb); /* Offset of sound data */
goto got_sound;
default: /* Jump */
if (size & 1) /* Always even aligned */
size++;
url_fskip (pb, size);
}
}
/* End of loop and didn't get sound */
return AVERROR_INVALIDDATA;
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->nb_frames;
/* Position the stream at the first block */
url_fskip(pb, offset);
return 0;
}
#define MAX_SIZE 4096
static int aiff_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
AVStream *st = s->streams[0];
int res;
/* End of stream may be reached */
if (url_feof(&s->pb))
return AVERROR_IO;
/* Now for that packet */
res = av_get_packet(&s->pb, pkt, (MAX_SIZE / st->codec->block_align) * st->codec->block_align);
if (res < 0)
return res;
/* Only one stream in an AIFF file */
pkt->stream_index = 0;
return 0;
}
static int aiff_read_close(AVFormatContext *s)
{
return 0;
}
static int aiff_read_seek(AVFormatContext *s,
int stream_index, int64_t timestamp, int flags)
{
return pcm_read_seek(s, stream_index, timestamp, flags);
}
#ifdef CONFIG_AIFF_DEMUXER
AVInputFormat aiff_demuxer = {
"aiff",
"Audio IFF",
0,
aiff_probe,
aiff_read_header,
aiff_read_packet,
aiff_read_close,
aiff_read_seek,
};
#endif
#ifdef CONFIG_AIFF_MUXER
AVOutputFormat aiff_muxer = {
"aiff",
"Audio IFF",
"audio/aiff",
"aif,aiff,afc,aifc",
sizeof(AIFFOutputContext),
CODEC_ID_PCM_S16BE,
CODEC_ID_NONE,
aiff_write_header,
aiff_write_packet,
aiff_write_trailer,
};
#endif
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