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Ogg demuxer ported from tcvp by Luca Barbato <lu_zero at gentoo dot org>,

Browse Source 
fixups by me.

Originally committed as revision 4113 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2005-04-09 15:32:58 +00:00
parent a18ba90880
commit 9146ca3700
8 changed files with 918 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
configure vendored
View File

@ -16,7 +16,7 @@ echo " --prefix=PREFIX install in PREFIX [$prefix]"
echo " --libdir=DIR install libs in DIR [PREFIX/lib]"
echo " --mandir=DIR man documentation in DIR [PREFIX/man]"
echo " --enable-mp3lame enable mp3 encoding via libmp3lame [default=no]"
echo " --enable-ogg enable ogg support via libogg [default=no]"
echo " --enable-libogg enable ogg support via libogg [default=no]"
echo " --enable-vorbis enable vorbis support via libvorbis [default=no]"
echo " --enable-theora enable theora support via libtheora [default=no]"
echo " --enable-faad enable faad support via libfaad [default=no]"
@ -154,7 +154,7 @@ dc1394="no"
network="yes"
zlib="yes"
mp3lame="no"
ogg="no"
libogg="no"
vorbis="no"
theora="no"
faad="no"
@ -432,7 +432,7 @@ for opt do
;;
--enable-mp3lame) mp3lame="yes"
;;
--enable-ogg) ogg="yes"
--enable-libogg) libogg="yes"
;;
--enable-vorbis) vorbis="yes"
;;
@ -492,16 +492,16 @@ for opt do
done
if test "$theora" = "yes" ; then
if test "$ogg" = "no" ; then
echo "Ogg must be enabled to enable Theora"
if test "$libogg" = "no"; then
echo "libogg must be enabled to enable Theora"
fail="yes"
theora="no"
fi
fi
if test "$vorbis" = "yes" ; then
if test "$ogg" = "no" ; then
echo "Ogg must be enabled to enable Vorbis"
if test "$libogg" = "no"; then
echo "libogg must be enabled to enable Vorbis"
fail="yes"
vorbis="no"
fi
@ -1095,7 +1095,7 @@ fi
echo "gprof enabled $gprof"
echo "zlib enabled $zlib"
echo "mp3lame enabled $mp3lame"
echo "ogg enabled $ogg"
echo "libogg enabled $libogg"
echo "vorbis enabled $vorbis"
echo "theora enabled $theora"
echo "faad enabled $faad"
@ -1395,7 +1395,7 @@ if test "$mp3lame" = "yes" ; then
echo "CONFIG_MP3LAME=yes" >> config.mak
fi
if test "$ogg" = "yes" ; then
if test "$libogg" = "yes" ; then
echo "#define CONFIG_LIBOGG 1" >> $TMPH
echo "CONFIG_LIBOGG=yes" >> config.mak
fi

4
libavformat/Makefile
View File

@ -16,8 +16,8 @@ OBJS+=mpeg.o mpegts.o mpegtsenc.o ffm.o crc.o img.o img2.o raw.o rm.o \
avienc.o avidec.o wav.o swf.o au.o gif.o mov.o mpjpeg.o dv.o \
yuv4mpeg.o 4xm.o flvenc.o flvdec.o movenc.o psxstr.o idroq.o ipmovie.o \
nut.o wc3movie.o mp3.o westwood.o segafilm.o idcin.o flic.o \
sierravmd.o matroska.o sol.o electronicarts.o nsvdec.o asf.o asf-enc.o
sierravmd.o matroska.o sol.o electronicarts.o nsvdec.o asf.o asf-enc.o \
ogg2.o oggparsevorbis.o
AMROBJS=
ifeq ($(AMR_NB),yes)
AMROBJS= amr.o

3
libavformat/allformats.c
View File

@ -82,8 +82,9 @@ void av_register_all(void)
#endif
yuv4mpeg_init();
#ifdef CONFIG_LIBOGG
ogg_init();
#ifdef CONFIG_LIBOGG
libogg_init();
#endif
ffm_init();

5
libavformat/avformat.h
View File

@ -467,9 +467,12 @@ int mp3_init(void);
/* yuv4mpeg.c */
int yuv4mpeg_init(void);
/* ogg.c */
/* ogg2.c */
int ogg_init(void);
/* ogg.c */
int libogg_init(void);
/* dv.c */
int ff_dv_init(void);

8
libavformat/ogg.c
View File

@ -134,7 +134,7 @@ static AVOutputFormat ogg_oformat = {
} ;
#endif //CONFIG_ENCODERS
#if 0
static int next_packet(AVFormatContext *avfcontext, ogg_packet *op) {
OggContext *context = avfcontext->priv_data ;
ogg_page og ;
@ -247,12 +247,12 @@ static AVInputFormat ogg_iformat = {
ogg_read_close,
.extensions = "ogg",
} ;
#endif
int ogg_init(void) {
int libogg_init(void) {
#ifdef CONFIG_ENCODERS
av_register_output_format(&ogg_oformat) ;
#endif
av_register_input_format(&ogg_iformat);
/* av_register_input_format(&ogg_iformat); */
return 0 ;
}

643
libavformat/ogg2.c Normal file
View File

@ -0,0 +1,643 @@
/*
* Ogg bitstream support
* Luca Barbato <lu_zero@gentoo.org>
* Based on tcvp implementation
*
*/
/**
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use, copy,
modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
**/
#include <stdio.h>
#include "ogg2.h"
#include "avformat.h"
#define MAX_PAGE_SIZE 65307
#define DECODER_BUFFER_SIZE MAX_PAGE_SIZE
static ogg_codec_t *ogg_codecs[] = {
&vorbis_codec,
NULL
};
#if 0 // CONFIG_ENCODERS
static int
ogg_write_header (AVFormatContext * avfcontext)
{
}
static int
ogg_write_packet (AVFormatContext * avfcontext, AVPacket * pkt)
{
}
static int
ogg_write_trailer (AVFormatContext * avfcontext)
{
}
static AVOutputFormat ogg_oformat = {
"ogg",
"Ogg Vorbis",
"audio/x-vorbis",
"ogg",
sizeof (OggContext),
CODEC_ID_VORBIS,
0,
ogg_write_header,
ogg_write_packet,
ogg_write_trailer,
};
#endif //CONFIG_ENCODERS
//FIXME We could avoid some structure duplication
static int
ogg_save (AVFormatContext * s)
{
ogg_t *ogg = s->priv_data;
ogg_state_t *ost =
av_malloc(sizeof (*ost) + ogg->nstreams * sizeof (*ogg->streams));
int i;
ost->pos = url_ftell (&s->pb);;
ost->curidx = ogg->curidx;
ost->next = ogg->state;
memcpy(ost->streams, ogg->streams, ogg->nstreams * sizeof(*ogg->streams));
for (i = 0; i < ogg->nstreams; i++){
ogg_stream_t *os = ogg->streams + i;
os->buf = av_malloc (os->bufsize);
memset (os->buf, 0, os->bufsize);
memcpy (os->buf, ost->streams[i].buf, os->bufpos);
}
ogg->state = ost;
return 0;
}
static int
ogg_restore (AVFormatContext * s, int discard)
{
ogg_t *ogg = s->priv_data;
ByteIOContext *bc = &s->pb;
ogg_state_t *ost = ogg->state;
int i;
if (!ost)
return 0;
ogg->state = ost->next;
if (!discard){
for (i = 0; i < ogg->nstreams; i++)
av_free (ogg->streams[i].buf);
url_fseek (bc, ost->pos, SEEK_SET);
ogg->curidx = ost->curidx;
memcpy (ogg->streams, ost->streams,
ogg->nstreams * sizeof (*ogg->streams));
}
av_free (ost);
return 0;
}
static int
ogg_reset (ogg_t * ogg)
{
int i;
for (i = 0; i < ogg->nstreams; i++){
ogg_stream_t *os = ogg->streams + i;
os->bufpos = 0;
os->pstart = 0;
os->psize = 0;
os->granule = -1;
os->lastgp = -1;
os->nsegs = 0;
os->segp = 0;
}
ogg->curidx = -1;
return 0;
}
static ogg_codec_t *
ogg_find_codec (u_char * buf, int size)
{
int i;
for (i = 0; ogg_codecs[i]; i++)
if (size >= ogg_codecs[i]->magicsize &&
!memcmp (buf, ogg_codecs[i]->magic, ogg_codecs[i]->magicsize))
return ogg_codecs[i];
return NULL;
}
static int
ogg_find_stream (ogg_t * ogg, int serial)
{
int i;
for (i = 0; i < ogg->nstreams; i++)
if (ogg->streams[i].serial == serial)
return i;
return -1;
}
static int
ogg_new_stream (AVFormatContext * s, uint32_t serial)
{
ogg_t *ogg = s->priv_data;
int idx = ogg->nstreams++;
AVStream *st;
ogg_stream_t *os;
ogg->streams = av_realloc (ogg->streams,
ogg->nstreams * sizeof (*ogg->streams));
memset (ogg->streams + idx, 0, sizeof (*ogg->streams));
os = ogg->streams + idx;
os->serial = serial;
os->bufsize = DECODER_BUFFER_SIZE;
os->buf = av_malloc (os->bufsize);
memset (os->buf, 0, os->bufsize);
os->header = -1;
st = av_new_stream (s, idx);
if (!st)
return AVERROR_NOMEM;
av_set_pts_info(st, 64, 1, 1000000);
st->start_time = 0;
return idx;
}
static int
ogg_read_page (AVFormatContext * s, int *str)
{
ByteIOContext *bc = &s->pb;
ogg_t *ogg = s->priv_data;
ogg_stream_t *os;
int i = 0;
int flags, nsegs;
uint64_t gp;
uint32_t serial;
uint32_t seq;
uint32_t crc;
int size, idx;
char sync[4];
int sp = 0;
if (get_buffer (bc, sync, 4) < 4)
return -1;
do{
int c;
if (sync[sp & 3] == 'O' &&
sync[(sp + 1) & 3] == 'g' &&
sync[(sp + 2) & 3] == 'g' && sync[(sp + 3) & 3] == 'S')
break;
c = url_fgetc (bc);
if (c < 0)
return -1;
sync[sp++ & 3] = c;
}while (i++ < MAX_PAGE_SIZE);
if (i >= MAX_PAGE_SIZE){
av_log (s, AV_LOG_INFO, "ogg, can't find sync word\n");
return -1;
}
if (url_fgetc (bc) != 0) /* version */
return -1;
flags = url_fgetc (bc);
gp = get_le64 (bc);
serial = get_le32 (bc);
seq = get_le32 (bc);
crc = get_le32 (bc);
nsegs = url_fgetc (bc);
idx = ogg_find_stream (ogg, serial);
if (idx < 0){
idx = ogg_new_stream (s, serial);
if (idx < 0)
return -1;
}
os = ogg->streams + idx;
if (get_buffer (bc, os->segments, nsegs) < nsegs)
return -1;
os->nsegs = nsegs;
os->segp = 0;
size = 0;
for (i = 0; i < nsegs; i++)
size += os->segments[i];
if (flags & OGG_FLAG_CONT){
if (!os->psize){
while (os->segp < os->nsegs){
int seg = os->segments[os->segp++];
os->pstart += seg;
if (seg < 255)
break;
}
}
}else{
os->psize = 0;
}
if (os->bufsize - os->bufpos < size){
u_char *nb = av_malloc (os->bufsize *= 2);
memset (nb, 0, os->bufsize);
memcpy (nb, os->buf, os->bufpos);
av_free (os->buf);
os->buf = nb;
}
if (get_buffer (bc, os->buf + os->bufpos, size) < size)
return -1;
os->lastgp = os->granule;
os->bufpos += size;
os->granule = gp;
os->flags = flags;
if (str)
*str = idx;
return 0;
}
static int
ogg_packet (AVFormatContext * s, int *str)
{
ogg_t *ogg = s->priv_data;
int idx;
ogg_stream_t *os;
int complete = 0;
int segp = 0, psize = 0;
#if 0
av_log (s, AV_LOG_DEBUG, "ogg_packet: curidx=%i\n", ogg->curidx);
#endif
do{
idx = ogg->curidx;
while (idx < 0){
if (ogg_read_page (s, &idx) < 0)
return -1;
}
os = ogg->streams + idx;
#if 0
av_log (s, AV_LOG_DEBUG,
"ogg_packet: idx=%d pstart=%d psize=%d segp=%d nsegs=%d\n",
idx, os->pstart, os->psize, os->segp, os->nsegs);
#endif
if (!os->codec){
if (os->header < 0){
os->codec = ogg_find_codec (os->buf, os->bufpos);
if (!os->codec){
os->header = 0;
return 0;
}
}else{
return 0;
}
}
segp = os->segp;
psize = os->psize;
while (os->segp < os->nsegs){
int ss = os->segments[os->segp++];
os->psize += ss;
if (ss < 255){
complete = 1;
break;
}
}
if (!complete && os->segp == os->nsegs){
u_char *nb = av_malloc (os->bufsize);
int size = os->bufpos - os->pstart;
memset (nb, 0, os->bufsize);
memcpy (nb, os->buf + os->pstart, size);
av_free (os->buf);
os->buf = nb;
os->bufpos = size;
os->pstart = 0;
ogg->curidx = -1;
}
}while (!complete);
#if 0
av_log (s, AV_LOG_DEBUG,
"ogg_packet: idx %i, frame size %i, start %i\n",
idx, os->psize, os->pstart);
#endif
ogg->curidx = idx;
if (os->header < 0){
int hdr = os->codec->header (s, idx);
if (!hdr){
os->header = os->seq;
os->segp = segp;
os->psize = psize;
ogg->headers = 1;
}else{
os->pstart += os->psize;
os->psize = 0;
}
}
if (os->header > -1 && os->seq > os->header){
if (os->codec && os->codec->packet)
os->codec->packet (s, idx);
if (str)
*str = idx;
}
os->seq++;
if (os->segp == os->nsegs)
ogg->curidx = -1;
return 0;
}
static int
ogg_get_headers (AVFormatContext * s)
{
ogg_t *ogg = s->priv_data;
do{
if (ogg_packet (s, NULL) < 0)
return -1;
}while (!ogg->headers);
#if 0
av_log (s, AV_LOG_DEBUG, "found headers\n");
#endif
return 0;
}
static uint64_t
ogg_gptopts (AVFormatContext * s, int i, uint64_t gp)
{
AVStream *st = s->streams[i];
AVCodecContext *codec = &st->codec;
uint64_t pts = AV_NOPTS_VALUE;
if (codec->codec_type == CODEC_TYPE_AUDIO){
pts = gp * 1000000LL / codec->sample_rate;
}else if (codec->codec_type == CODEC_TYPE_VIDEO){
//FIXME
pts = gp * 1000000LL / codec->sample_rate;
// pts = gp * st->video.frame_rate.den * 27000000LL /
// st->video.frame_rate.num;
}
return pts;
}
static int
ogg_get_length (AVFormatContext * s)
{
ogg_t *ogg = s->priv_data;
URLContext *h = url_fileno (&s->pb);
int idx = -1, i;
//FIXME: get the right ctx flag to know if is seekable or not
// if(ogg->f->flags & URL_FLAG_STREAMED)
// return 0;
// already set
if (s->duration != AV_NOPTS_VALUE)
return 0;
ogg_save (s);
url_seek (h, -MAX_PAGE_SIZE, SEEK_END);
while (!ogg_read_page (s, &i)){
if (ogg->streams[i].granule != -1 && ogg->streams[i].granule != 0)
idx = i;
}
if (idx != -1){
s->streams[idx]->duration =
ogg_gptopts (s, idx, ogg->streams[idx].granule);
}
ogg->size = url_filesize(h);
ogg_restore (s, 0);
return 0;
}
static int
ogg_read_header (AVFormatContext * s, AVFormatParameters * ap)
{
ogg_t *ogg = s->priv_data;
ogg->curidx = -1;
//linear headers seek from start
if (ogg_get_headers (s) < 0){
return -1;
}
//linear granulepos seek from end
ogg_get_length (s);
//fill the extradata in the per codec callbacks
return 0;
}
static int
ogg_read_packet (AVFormatContext * s, AVPacket * pkt)
{
ogg_t *ogg;
ogg_stream_t *os;
int idx = -1;
//Get an ogg packet
do{
if (ogg_packet (s, &idx) < 0)
return AVERROR_IO;
}while (idx < 0 || !s->streams[idx]);
ogg = s->priv_data;
os = ogg->streams + idx;
//Alloc a pkt
if (av_new_packet (pkt, os->psize) < 0)
return AVERROR_IO;
pkt->stream_index = idx;
memcpy (pkt->data, os->buf + os->pstart, os->psize);
if (os->lastgp != -1LL){
pkt->pts = ogg_gptopts (s, idx, os->lastgp);
os->lastgp = -1;
}
//next
os->pstart += os->psize;
os->psize = 0;
return os->psize;
}
static int
ogg_read_close (AVFormatContext * s)
{
ogg_t *ogg = s->priv_data;
int i;
for (i = 0; i < ogg->nstreams; i++){
av_free (ogg->streams[i].buf);
av_freep (&s->streams[i]->codec.extradata);
}
av_free (ogg->streams);
return 0;
}
static int
ogg_read_seek (AVFormatContext * s, int stream_index, int64_t target_ts,
int flags)
{
ogg_t *ogg = s->priv_data;
ByteIOContext *bc = &s->pb;
uint64_t min = 0, max = ogg->size;
uint64_t tmin = 0, tmax = s->duration;
int64_t pts = AV_NOPTS_VALUE;
ogg_save (s);
while (min <= max){
uint64_t p = min + (max - min) * target_ts / (tmax - tmin);
int i = -1;
url_fseek (bc, p, SEEK_SET);
while (!ogg_read_page (s, &i)){
if (ogg->streams[i].granule != 0 && ogg->streams[i].granule != -1)
break;
}
if (i == -1)
break;
pts = ogg_gptopts (s, i, ogg->streams[i].granule);
p = url_ftell (bc);
if (ABS (pts - target_ts) < 1000000LL)
break;
if (pts > target_ts){
max = p;
tmax = pts;
}else{
min = p;
tmin = pts;
}
}
if (ABS (pts - target_ts) < 1000000LL){
ogg_restore (s, 1);
ogg_reset (ogg);
}else{
ogg_restore (s, 0);
pts = AV_NOPTS_VALUE;
}
return pts;
#if 0
//later...
int64_t pos;
if (av_seek_frame_binary (s, stream_index, target_ts, flags) < 0)
return -1;
pos = url_ftell (&s->pb);
ogg_read_timestamp (s, stream_index, &pos, pos - 1);
#endif
}
#if 0
static int64_t
ogg_read_timestamp (AVFormatContext * s, int stream_index, int64_t * pos_arg,
int64_t pos_limit)
{
ogg_t *ogg = s->priv_data;
ByteIOContext *bc = &s->pb;
int64_t pos, pts;
if (*pos_arg < 0)
return AV_NOPTS_VALUE;
pos = *pos_arg;
}
#endif
static AVInputFormat ogg_iformat = {
"ogg",
"Ogg",
sizeof (ogg_t),
NULL,
ogg_read_header,
ogg_read_packet,
ogg_read_close,
ogg_read_seek,
// ogg_read_timestamp,
.extensions = "ogg",
};
int
ogg_init (void)
{
#if 0 // CONFIG_ENCODERS
av_register_output_format (&ogg_oformat);
#endif
av_register_input_format (&ogg_iformat);
return 0;
}

84
libavformat/ogg2.h Normal file
View File

@ -0,0 +1,84 @@
/**
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use, copy,
modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
**/
#ifndef OGG_H
#define OGG_H
#include "avformat.h"
typedef struct ogg_codec {
uint8_t *magic;
uint8_t magicsize;
int8_t *name;
int (*header)(AVFormatContext *, int);
int (*packet)(AVFormatContext *, int);
} ogg_codec_t;
typedef struct ogg_stream {
uint8_t *buf;
unsigned int bufsize;
unsigned int bufpos;
unsigned int pstart;
unsigned int psize;
uint32_t serial;
uint32_t seq;
uint64_t granule, lastgp;
int flags;
ogg_codec_t *codec;
int header;
int nsegs, segp;
uint8_t segments[255];
} ogg_stream_t;
typedef struct ogg_state {
uint64_t pos;
int curidx;
struct ogg_state *next;
ogg_stream_t streams[];
} ogg_state_t;
typedef struct ogg {
ogg_stream_t *streams;
int nstreams;
int headers;
int curidx;
uint64_t size;
ogg_state_t *state;
} ogg_t;
#define OGG_FLAG_CONT 1
#define OGG_FLAG_BOS 2
#define OGG_FLAG_EOS 4
extern ogg_codec_t vorbis_codec;
#if 0
extern ogg_codec_t ogm_video_codec;
extern ogg_codec_t ogm_audio_codec;
extern ogg_codec_t ogm_old_codec;
extern ogg_codec_t flac_codec;
#endif
extern int vorbis_comment(AVFormatContext *ms, char *buf, int size);
#endif

169
libavformat/oggparsevorbis.c Normal file
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@ -0,0 +1,169 @@
/**
Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use, copy,
modify, merge, publish, distribute, sublicense, and/or sell copies
of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
**/
#include <stdlib.h>
#include "avformat.h"
#include "bitstream.h"
#include "bswap.h"
#include "ogg2.h"
extern int
vorbis_comment (AVFormatContext * as, char *buf, int size)
{
char *p = buf;
int s, n, j;
if (size < 4)
return -1;
s = le2me_32 (unaligned32 (p));
p += 4;
size -= 4;
if (size < s + 4)
return -1;
p += s;
size -= s;
n = le2me_32 (unaligned32 (p));
p += 4;
size -= 4;
while (size >= 4){
char *t, *v;
int tl, vl;
s = le2me_32 (unaligned32 (p));
p += 4;
size -= 4;
if (size < s)
break;
t = p;
p += s;
size -= s;
n--;
v = memchr (t, '=', s);
if (!v)
continue;
tl = v - t;
vl = s - tl - 1;
v++;
if (tl && vl){
char tt[tl + 1];
char ct[vl + 1];
for (j = 0; j < tl; j++)
tt[j] = toupper (t[j]);
tt[tl] = 0;
memcpy (ct, v, vl);
ct[vl] = 0;
// took from Vorbis_I_spec
if (!strcmp (tt, "AUTHOR"))
strncpy (as->author, ct, FFMIN(sizeof (as->author), vl));
else if (!strcmp (tt, "TITLE"))
strncpy (as->title, ct, FFMIN(sizeof (as->title), vl));
else if (!strcmp (tt, "COPYRIGHT"))
strncpy (as->copyright, ct, FFMIN(sizeof (as->copyright), vl));
else if (!strcmp (tt, "DESCRIPTION"))
strncpy (as->comment, ct, FFMIN(sizeof (as->comment), vl));
else if (!strcmp (tt, "GENRE"))
strncpy (as->genre, ct, FFMIN(sizeof (as->genre), vl));
else if (!strcmp (tt, "TRACKNUMBER"))
as->track = atoi (ct);
//Too bored to add others for today
}
}
if (size > 0)
av_log (as, AV_LOG_INFO, "%i bytes of comment header remain\n", size);
if (n > 0)
av_log (as, AV_LOG_INFO,
"truncated comment header, %i comments not found\n", n);
return 0;
}
/** Parse the vorbis header
* Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
* [vorbis_version] = read 32 bits as unsigned integer | Not used
* [audio_channels] = read 8 bit integer as unsigned | Used
* [audio_sample_rate] = read 32 bits as unsigned integer | Used
* [bitrate_maximum] = read 32 bits as signed integer | Not used yet
* [bitrate_nominal] = read 32 bits as signed integer | Not used yet
* [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
* [blocksize_0] = read 4 bits as unsigned integer | Not Used
* [blocksize_1] = read 4 bits as unsigned integer | Not Used
* [framing_flag] = read one bit | Not Used
* */
static int
vorbis_header (AVFormatContext * s, int idx)
{
ogg_t *ogg = s->priv_data;
ogg_stream_t *os = ogg->streams + idx;
AVStream *st = s->streams[idx];
int cds = st->codec.extradata_size + os->psize + 2;
u_char *cdp;
if (os->seq > 2)
return 0;
st->codec.extradata = av_realloc (st->codec.extradata, cds);
cdp = st->codec.extradata + st->codec.extradata_size;
*cdp++ = os->psize >> 8;
*cdp++ = os->psize & 0xff;
memcpy (cdp, os->buf + os->pstart, os->psize);
st->codec.extradata_size = cds;
if (os->buf[os->pstart] == 1) {
u_char *p = os->buf + os->pstart + 11; //skip up to the audio channels
st->codec.channels = *p++;
st->codec.sample_rate = le2me_32 (unaligned32 (p));
p += 8; //skip maximum and and nominal bitrate
st->codec.bit_rate = le2me_32 (unaligned32 (p)); //Minimum bitrate
st->codec.codec_type = CODEC_TYPE_AUDIO;
st->codec.codec_id = CODEC_ID_VORBIS;
} else if (os->buf[os->pstart] == 3) {
vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
}
return os->seq < 3;
}
ogg_codec_t vorbis_codec = {
.magic = "\001vorbis",
.magicsize = 7,
.header = vorbis_header
};