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ffmpeg/libavformat/mov.c
Sebastien Bechet 15c8dbe778 2000/00/00 to 2001/03/01 QT fileformat documentation patch by (Sebastien Bechet <s.bechet at av7 dot net>) 
Originally committed as revision 3360 to svn://svn.ffmpeg.org/ffmpeg/trunk
2004-07-28 10:04:14 +00:00

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/*
* MOV decoder.
* Copyright (c) 2001 Fabrice Bellard.
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <limits.h>
#include "avformat.h"
#include "avi.h"
#ifdef CONFIG_ZLIB
#include <zlib.h>
#endif
/*
* First version by Francois Revol revol@free.fr
* Seek function by Gael Chardon gael.dev@4now.net
*
* Features and limitations:
* - reads most of the QT files I have (at least the structure),
* the exceptions are .mov with zlib compressed headers ('cmov' section). It shouldn't be hard to implement.
* FIXED, Francois Revol, 07/17/2002
* - ffmpeg has nearly none of the usual QuickTime codecs,
* although I succesfully dumped raw and mp3 audio tracks off .mov files.
* Sample QuickTime files with mp3 audio can be found at: http://www.3ivx.com/showcase.html
* - .mp4 parsing is still hazardous, although the format really is QuickTime with some minor changes
* (to make .mov parser crash maybe ?), despite what they say in the MPEG FAQ at
* http://mpeg.telecomitalialab.com/faq.htm
* - the code is quite ugly... maybe I won't do it recursive next time :-)
* - seek is not supported with files that contain edit list
*
* Funny I didn't know about http://sourceforge.net/projects/qt-ffmpeg/
* when coding this :) (it's a writer anyway)
*
* Reference documents:
* http://www.geocities.com/xhelmboyx/quicktime/formats/qtm-layout.txt
* Apple:
* http://developer.apple.com/documentation/QuickTime/QTFF/
* http://developer.apple.com/documentation/QuickTime/QTFF/qtff.pdf
* QuickTime is a trademark of Apple (AFAIK :))
*/
//#define DEBUG
#ifdef DEBUG
#include <stdio.h>
#include <fcntl.h>
#endif
#include "qtpalette.h"
/* Allows seeking (MOV_SPLIT_CHUNKS should also be defined) */
#define MOV_SEEK
/* allows chunk splitting - should work now... */
/* in case you can't read a file, try commenting */
#define MOV_SPLIT_CHUNKS
/* Special handling for movies created with Minolta Dimaxe Xi*/
/* this fix should not interfere with other .mov files, but just in case*/
#define MOV_MINOLTA_FIX
/* some streams in QT (and in MP4 mostly) aren't either video nor audio */
/* so we first list them as this, then clean up the list of streams we give back, */
/* getting rid of these */
#define CODEC_TYPE_MOV_OTHER (enum CodecType) 2
static const CodecTag mov_video_tags[] = {
/* { CODEC_ID_, MKTAG('c', 'v', 'i', 'd') }, *//* Cinepak */
/* { CODEC_ID_H263, MKTAG('r', 'a', 'w', ' ') }, *//* Uncompressed RGB */
/* { CODEC_ID_H263, MKTAG('Y', 'u', 'v', '2') }, *//* Uncompressed YUV422 */
/* { CODEC_ID_RAWVIDEO, MKTAG('A', 'V', 'U', 'I') }, *//* YUV with alpha-channel (AVID Uncompressed) */
/* Graphics */
/* Animation */
/* Apple video */
/* Kodak Photo CD */
{ CODEC_ID_MJPEG, MKTAG('j', 'p', 'e', 'g') }, /* PhotoJPEG */
{ CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'e', 'g') }, /* MPEG */
{ CODEC_ID_MJPEG, MKTAG('m', 'j', 'p', 'a') }, /* Motion-JPEG (format A) */
{ CODEC_ID_MJPEG, MKTAG('m', 'j', 'p', 'b') }, /* Motion-JPEG (format B) */
{ CODEC_ID_MJPEG, MKTAG('A', 'V', 'D', 'J') }, /* MJPEG with alpha-channel (AVID JFIF meridien compressed) */
/* { CODEC_ID_MJPEG, MKTAG('A', 'V', 'R', 'n') }, *//* MJPEG with alpha-channel (AVID ABVB/Truevision NuVista) */
/* { CODEC_ID_GIF, MKTAG('g', 'i', 'f', ' ') }, *//* embedded gif files as frames (usually one "click to play movie" frame) */
/* Sorenson video */
{ CODEC_ID_SVQ1, MKTAG('S', 'V', 'Q', '1') }, /* Sorenson Video v1 */
{ CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') }, /* Sorenson Video v1 */
{ CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', 'i') }, /* Sorenson Video v1 (from QT specs)*/
{ CODEC_ID_SVQ3, MKTAG('S', 'V', 'Q', '3') }, /* Sorenson Video v3 */
{ CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') },
{ CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X') }, /* OpenDiVX *//* sample files at http://heroinewarrior.com/xmovie.php3 use this tag */
{ CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') },
/* { CODEC_ID_, MKTAG('I', 'V', '5', '0') }, *//* Indeo 5.0 */
{ CODEC_ID_H263, MKTAG('h', '2', '6', '3') }, /* H263 */
{ CODEC_ID_H263, MKTAG('s', '2', '6', '3') }, /* H263 ?? works */
{ CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', ' ') }, /* DV NTSC */
{ CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', 'p') }, /* DV PAL */
/* { CODEC_ID_DVVIDEO, MKTAG('A', 'V', 'd', 'v') }, *//* AVID dv */
{ CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') }, /* On2 VP3 */
{ CODEC_ID_RPZA, MKTAG('r', 'p', 'z', 'a') }, /* Apple Video (RPZA) */
{ CODEC_ID_CINEPAK, MKTAG('c', 'v', 'i', 'd') }, /* Cinepak */
{ CODEC_ID_8BPS, MKTAG('8', 'B', 'P', 'S') }, /* Planar RGB (8BPS) */
{ CODEC_ID_SMC, MKTAG('s', 'm', 'c', ' ') }, /* Apple Graphics (SMC) */
{ CODEC_ID_QTRLE, MKTAG('r', 'l', 'e', ' ') }, /* Apple Animation (RLE) */
{ CODEC_ID_NONE, 0 },
};
static const CodecTag mov_audio_tags[] = {
/* { CODEC_ID_PCM_S16BE, MKTAG('N', 'O', 'N', 'E') }, *//* uncompressed */
{ CODEC_ID_PCM_S16BE, MKTAG('t', 'w', 'o', 's') }, /* 16 bits */
/* { CODEC_ID_PCM_S8, MKTAG('t', 'w', 'o', 's') },*/ /* 8 bits */
{ CODEC_ID_PCM_U8, MKTAG('r', 'a', 'w', ' ') }, /* 8 bits unsigned */
{ CODEC_ID_PCM_S16LE, MKTAG('s', 'o', 'w', 't') }, /* */
{ CODEC_ID_PCM_MULAW, MKTAG('u', 'l', 'a', 'w') }, /* */
{ CODEC_ID_PCM_ALAW, MKTAG('a', 'l', 'a', 'w') }, /* */
{ CODEC_ID_ADPCM_IMA_QT, MKTAG('i', 'm', 'a', '4') }, /* IMA-4 ADPCM */
{ CODEC_ID_MACE3, MKTAG('M', 'A', 'C', '3') }, /* Macintosh Audio Compression and Expansion 3:1 */
{ CODEC_ID_MACE6, MKTAG('M', 'A', 'C', '6') }, /* Macintosh Audio Compression and Expansion 6:1 */
{ CODEC_ID_MP2, MKTAG('.', 'm', 'p', '3') }, /* MPEG layer 3 */ /* sample files at http://www.3ivx.com/showcase.html use this tag */
{ CODEC_ID_MP2, 0x6D730055 }, /* MPEG layer 3 */
{ CODEC_ID_MP2, 0x5500736D }, /* MPEG layer 3 *//* XXX: check endianness */
/* { CODEC_ID_OGG_VORBIS, MKTAG('O', 'g', 'g', 'S') }, *//* sample files at http://heroinewarrior.com/xmovie.php3 use this tag */
/* MP4 tags */
{ CODEC_ID_MPEG4AAC, MKTAG('m', 'p', '4', 'a') }, /* MPEG-4 AAC */
/* The standard for mpeg4 audio is still not normalised AFAIK anyway */
{ CODEC_ID_AMR_NB, MKTAG('s', 'a', 'm', 'r') }, /* AMR-NB 3gp */
{ CODEC_ID_AMR_WB, MKTAG('s', 'a', 'w', 'b') }, /* AMR-WB 3gp */
{ CODEC_ID_AC3, MKTAG('m', 's', 0x20, 0x00) }, /* Dolby AC-3 */
{ CODEC_ID_NONE, 0 },
};
/* the QuickTime file format is quite convoluted...
* it has lots of index tables, each indexing something in another one...
* Here we just use what is needed to read the chunks
*/
typedef struct MOV_sample_to_chunk_tbl {
long first;
long count;
long id;
} MOV_sample_to_chunk_tbl;
typedef struct {
uint32_t type;
int64_t offset;
int64_t size; /* total size (excluding the size and type fields) */
} MOV_atom_t;
typedef struct {
int seed;
int flags;
int size;
void* clrs;
} MOV_ctab_t;
typedef struct {
uint8_t version;
uint32_t flags; // 24bit
/* 0x03 ESDescrTag */
uint16_t es_id;
#define MP4ODescrTag 0x01
#define MP4IODescrTag 0x02
#define MP4ESDescrTag 0x03
#define MP4DecConfigDescrTag 0x04
#define MP4DecSpecificDescrTag 0x05
#define MP4SLConfigDescrTag 0x06
#define MP4ContentIdDescrTag 0x07
#define MP4SupplContentIdDescrTag 0x08
#define MP4IPIPtrDescrTag 0x09
#define MP4IPMPPtrDescrTag 0x0A
#define MP4IPMPDescrTag 0x0B
#define MP4RegistrationDescrTag 0x0D
#define MP4ESIDIncDescrTag 0x0E
#define MP4ESIDRefDescrTag 0x0F
#define MP4FileIODescrTag 0x10
#define MP4FileODescrTag 0x11
#define MP4ExtProfileLevelDescrTag 0x13
#define MP4ExtDescrTagsStart 0x80
#define MP4ExtDescrTagsEnd 0xFE
uint8_t stream_priority;
/* 0x04 DecConfigDescrTag */
uint8_t object_type_id;
uint8_t stream_type;
/* XXX: really streamType is
* only 6bit, followed by:
* 1bit upStream
* 1bit reserved
*/
uint32_t buffer_size_db; // 24
uint32_t max_bitrate;
uint32_t avg_bitrate;
/* 0x05 DecSpecificDescrTag */
uint8_t decoder_cfg_len;
uint8_t *decoder_cfg;
/* 0x06 SLConfigDescrTag */
uint8_t sl_config_len;
uint8_t *sl_config;
} MOV_esds_t;
struct MOVParseTableEntry;
typedef struct MOVStreamContext {
int ffindex; /* the ffmpeg stream id */
int is_ff_stream; /* Is this stream presented to ffmpeg ? i.e. is this an audio or video stream ? */
long next_chunk;
long chunk_count;
int64_t *chunk_offsets;
int32_t stts_count;
uint64_t *stts_data; /* concatenated data from the time-to-sample atom (count|duration) */
int32_t edit_count; /* number of 'edit' (elst atom) */
long sample_to_chunk_sz;
MOV_sample_to_chunk_tbl *sample_to_chunk;
long sample_to_chunk_index;
long sample_size;
long sample_count;
long *sample_sizes;
long keyframe_count;
long *keyframes;
int time_scale;
long current_sample;
long left_in_chunk; /* how many samples before next chunk */
/* specific MPEG4 header which is added at the beginning of the stream */
int header_len;
uint8_t *header_data;
MOV_esds_t esds;
} MOVStreamContext;
typedef struct MOVContext {
int mp4; /* set to 1 as soon as we are sure that the file is an .mp4 file (even some header parsing depends on this) */
AVFormatContext *fc;
int time_scale;
int duration; /* duration of the longest track */
int found_moov; /* when both 'moov' and 'mdat' sections has been found */
int found_mdat; /* we suppose we have enough data to read the file */
int64_t mdat_size;
int64_t mdat_offset;
int total_streams;
/* some streams listed here aren't presented to the ffmpeg API, since they aren't either video nor audio
* but we need the info to be able to skip data from those streams in the 'mdat' section
*/
MOVStreamContext *streams[MAX_STREAMS];
int64_t next_chunk_offset;
MOVStreamContext *partial; /* != 0 : there is still to read in the current chunk */
int ctab_size;
MOV_ctab_t **ctab; /* color tables */
const struct MOVParseTableEntry *parse_table; /* could be eventually used to change the table */
/* NOTE: for recursion save to/ restore from local variable! */
AVPaletteControl palette_control;
} MOVContext;
/* XXX: it's the first time I make a recursive parser I think... sorry if it's ugly :P */
/* those functions parse an atom */
/* return code:
1: found what I wanted, exit
0: continue to parse next atom
-1: error occured, exit
*/
typedef int (*mov_parse_function)(MOVContext *ctx, ByteIOContext *pb, MOV_atom_t atom);
/* links atom IDs to parse functions */
typedef struct MOVParseTableEntry {
uint32_t type;
mov_parse_function func;
} MOVParseTableEntry;
#ifdef DEBUG
/*
* XXX: static sux, even more in a multithreaded environment...
* Avoid them. This is here just to help debugging.
*/
static int debug_indent = 0;
void print_atom(const char *str, MOV_atom_t atom)
{
unsigned int tag, i;
tag = (unsigned int) atom.type;
i=debug_indent;
if(tag == 0) tag = MKTAG('N', 'U', 'L', 'L');
while(i--)
av_log(NULL, AV_LOG_DEBUG, "|");
av_log(NULL, AV_LOG_DEBUG, "parse:");
av_log(NULL, AV_LOG_DEBUG, " %s: tag=%c%c%c%c offset=0x%x size=0x%x\n",
str, tag & 0xff,
(tag >> 8) & 0xff,
(tag >> 16) & 0xff,
(tag >> 24) & 0xff,
(unsigned int)atom.offset,
(unsigned int)atom.size);
assert((unsigned int)atom.size < 0x7fffffff);// catching errors
}
#else
#define print_atom(a,b)
#endif
static int mov_read_leaf(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
print_atom("leaf", atom);
if (atom.size>1)
url_fskip(pb, atom.size);
/* url_seek(pb, atom_offset+atom.size, SEEK_SET); */
return 0;
}
static int mov_read_default(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
int64_t total_size = 0;
MOV_atom_t a;
int i;
int err = 0;
#ifdef DEBUG
print_atom("default", atom);
debug_indent++;
#endif
a.offset = atom.offset;
if (atom.size < 0)
atom.size = 0x7fffffffffffffffLL;
while(((total_size + 8) < atom.size) && !url_feof(pb) && !err) {
a.size = atom.size;
a.type=0L;
if(atom.size >= 8) {
a.size = get_be32(pb);
a.type = get_le32(pb);
}
total_size += 8;
a.offset += 8;
//av_log(NULL, AV_LOG_DEBUG, "type: %08x %.4s sz: %Lx %Lx %Lx\n", type, (char*)&type, size, atom.size, total_size);
if (a.size == 1) { /* 64 bit extended size */
a.size = get_be64(pb) - 8;
a.offset += 8;
total_size += 8;
}
if (a.size == 0) {
a.size = atom.size - total_size;
if (a.size <= 8)
break;
}
for (i = 0; c->parse_table[i].type != 0L
&& c->parse_table[i].type != a.type; i++)
/* empty */;
a.size -= 8;
// av_log(NULL, AV_LOG_DEBUG, " i=%ld\n", i);
if (c->parse_table[i].type == 0) { /* skip leaf atoms data */
// url_seek(pb, atom.offset+atom.size, SEEK_SET);
#ifdef DEBUG
print_atom("unknown", a);
#endif
url_fskip(pb, a.size);
} else {
#ifdef DEBUG
//char b[5] = { type & 0xff, (type >> 8) & 0xff, (type >> 16) & 0xff, (type >> 24) & 0xff, 0 };
//print_atom(b, type, offset, size);
#endif
err = (c->parse_table[i].func)(c, pb, a);
}
a.offset += a.size;
total_size += a.size;
}
if (!err && total_size < atom.size && atom.size < 0x7ffff) {
//av_log(NULL, AV_LOG_DEBUG, "RESET %Ld %Ld err:%d\n", atom.size, total_size, err);
url_fskip(pb, atom.size - total_size);
}
#ifdef DEBUG
debug_indent--;
#endif
return err;
}
static int mov_read_ctab(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
unsigned int len;
MOV_ctab_t *t;
//url_fskip(pb, atom.size); // for now
c->ctab = av_realloc(c->ctab, ++c->ctab_size);
t = c->ctab[c->ctab_size];
t->seed = get_be32(pb);
t->flags = get_be16(pb);
t->size = get_be16(pb) + 1;
len = 2 * t->size * 4;
if (len > 0) {
t->clrs = av_malloc(len); // 16bit A R G B
if (t->clrs)
get_buffer(pb, t->clrs, len);
}
return 0;
}
static int mov_read_hdlr(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
AVStream *st = c->fc->streams[c->fc->nb_streams-1];
int len = 0;
uint32_t type;
uint32_t ctype;
print_atom("hdlr", atom);
get_byte(pb); /* version */
get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
/* component type */
ctype = get_le32(pb);
type = get_le32(pb); /* component subtype */
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "ctype= %c%c%c%c (0x%08lx)\n", *((char *)&ctype), ((char *)&ctype)[1], ((char *)&ctype)[2], ((char *)&ctype)[3], (long) ctype);
av_log(NULL, AV_LOG_DEBUG, "stype= %c%c%c%c\n", *((char *)&type), ((char *)&type)[1], ((char *)&type)[2], ((char *)&type)[3]);
#endif
#ifdef DEBUG
/* XXX: yeah this is ugly... */
if(ctype == MKTAG('m', 'h', 'l', 'r')) { /* MOV */
if(type == MKTAG('v', 'i', 'd', 'e'))
puts("hdlr: vide");
else if(type == MKTAG('s', 'o', 'u', 'n'))
puts("hdlr: soun");
} else if(ctype == 0) { /* MP4 */
if(type == MKTAG('v', 'i', 'd', 'e'))
puts("hdlr: vide");
else if(type == MKTAG('s', 'o', 'u', 'n'))
puts("hdlr: soun");
else if(type == MKTAG('o', 'd', 's', 'm'))
puts("hdlr: odsm");
else if(type == MKTAG('s', 'd', 's', 'm'))
puts("hdlr: sdsm");
} else puts("hdlr: meta");
#endif
if(ctype == MKTAG('m', 'h', 'l', 'r')) { /* MOV */
/* helps parsing the string hereafter... */
c->mp4 = 0;
if(type == MKTAG('v', 'i', 'd', 'e'))
st->codec.codec_type = CODEC_TYPE_VIDEO;
else if(type == MKTAG('s', 'o', 'u', 'n'))
st->codec.codec_type = CODEC_TYPE_AUDIO;
} else if(ctype == 0) { /* MP4 */
/* helps parsing the string hereafter... */
c->mp4 = 1;
if(type == MKTAG('v', 'i', 'd', 'e'))
st->codec.codec_type = CODEC_TYPE_VIDEO;
else if(type == MKTAG('s', 'o', 'u', 'n'))
st->codec.codec_type = CODEC_TYPE_AUDIO;
}
get_be32(pb); /* component manufacture */
get_be32(pb); /* component flags */
get_be32(pb); /* component flags mask */
if(atom.size <= 24)
return 0; /* nothing left to read */
/* XXX: MP4 uses a C string, not a pascal one */
/* component name */
if(c->mp4) {
/* .mp4: C string */
while(get_byte(pb) && (++len < (atom.size - 24)));
} else {
/* .mov: PASCAL string */
#ifdef DEBUG
char* buf;
#endif
len = get_byte(pb);
#ifdef DEBUG
buf = (uint8_t*) av_malloc(len+1);
if (buf) {
get_buffer(pb, buf, len);
buf[len] = '\0';
av_log(NULL, AV_LOG_DEBUG, "**buf='%s'\n", buf);
av_free(buf);
} else
#endif
url_fskip(pb, len);
}
url_fskip(pb, atom.size - (url_ftell(pb) - atom.offset));
return 0;
}
static int mov_mp4_read_descr_len(ByteIOContext *pb)
{
int len = 0;
int count = 4;
while (count--) {
int c = get_byte(pb);
len = (len << 7) | (c & 0x7f);
if (!(c & 0x80))
break;
}
return len;
}
static int mov_mp4_read_descr(ByteIOContext *pb, int *tag)
{
int len;
*tag = get_byte(pb);
len = mov_mp4_read_descr_len(pb);
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "MPEG4 description: tag=0x%02x len=%d\n", *tag, len);
#endif
return len;
}
static inline unsigned int get_be24(ByteIOContext *s)
{
unsigned int val;
val = get_byte(s) << 16;
val |= get_byte(s) << 8;
val |= get_byte(s);
return val;
}
static int mov_read_esds(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
AVStream *st = c->fc->streams[c->fc->nb_streams-1];
MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;
int64_t start_pos = url_ftell(pb);
int tag, len;
print_atom("esds", atom);
/* Well, broken but suffisant for some MP4 streams */
get_be32(pb); /* version + flags */
len = mov_mp4_read_descr(pb, &tag);
if (tag == MP4ESDescrTag) {
get_be16(pb); /* ID */
get_byte(pb); /* priority */
} else
get_be16(pb); /* ID */
len = mov_mp4_read_descr(pb, &tag);
if (tag == MP4DecConfigDescrTag) {
sc->esds.object_type_id = get_byte(pb);
sc->esds.stream_type = get_byte(pb);
sc->esds.buffer_size_db = get_be24(pb);
sc->esds.max_bitrate = get_be32(pb);
sc->esds.avg_bitrate = get_be32(pb);
len = mov_mp4_read_descr(pb, &tag);
//av_log(NULL, AV_LOG_DEBUG, "LEN %d TAG %d m:%d a:%d\n", len, tag, sc->esds.max_bitrate, sc->esds.avg_bitrate);
if (tag == MP4DecSpecificDescrTag) {
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "Specific MPEG4 header len=%d\n", len);
#endif
st->codec.extradata = (uint8_t*) av_mallocz(len);
if (st->codec.extradata) {
get_buffer(pb, st->codec.extradata, len);
st->codec.extradata_size = len;
}
}
}
/* in any case, skip garbage */
url_fskip(pb, atom.size - ((url_ftell(pb) - start_pos)));
return 0;
}
/* this atom contains actual media data */
static int mov_read_mdat(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
print_atom("mdat", atom);
if(atom.size == 0) /* wrong one (MP4) */
return 0;
c->found_mdat=1;
c->mdat_offset = atom.offset;
c->mdat_size = atom.size;
if(c->found_moov)
return 1; /* found both, just go */
url_fskip(pb, atom.size);
return 0; /* now go for moov */
}
/* this atom should contain all header atoms */
static int mov_read_moov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
int err;
print_atom("moov", atom);
err = mov_read_default(c, pb, atom);
/* we parsed the 'moov' atom, we can terminate the parsing as soon as we find the 'mdat' */
/* so we don't parse the whole file if over a network */
c->found_moov=1;
if(c->found_mdat)
return 1; /* found both, just go */
return 0; /* now go for mdat */
}
static int mov_read_mdhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
print_atom("mdhd", atom);
get_byte(pb); /* version */
get_byte(pb); get_byte(pb);
get_byte(pb); /* flags */
get_be32(pb); /* creation time */
get_be32(pb); /* modification time */
c->streams[c->fc->nb_streams-1]->time_scale = get_be32(pb);
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "track[%i].time_scale = %i\n", c->fc->nb_streams-1, c->streams[c->fc->nb_streams-1]->time_scale); /* time scale */
#endif
get_be32(pb); /* duration */
get_be16(pb); /* language */
get_be16(pb); /* quality */
return 0;
}
static int mov_read_mvhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
print_atom("mvhd", atom);
get_byte(pb); /* version */
get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
get_be32(pb); /* creation time */
get_be32(pb); /* modification time */
c->time_scale = get_be32(pb); /* time scale */
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "time scale = %i\n", c->time_scale);
#endif
c->duration = get_be32(pb); /* duration */
get_be32(pb); /* preferred scale */
get_be16(pb); /* preferred volume */
url_fskip(pb, 10); /* reserved */
url_fskip(pb, 36); /* display matrix */
get_be32(pb); /* preview time */
get_be32(pb); /* preview duration */
get_be32(pb); /* poster time */
get_be32(pb); /* selection time */
get_be32(pb); /* selection duration */
get_be32(pb); /* current time */
get_be32(pb); /* next track ID */
return 0;
}
static int mov_read_smi(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
AVStream *st = c->fc->streams[c->fc->nb_streams-1];
// currently SVQ3 decoder expect full STSD header - so let's fake it
// this should be fixed and just SMI header should be passed
av_free(st->codec.extradata);
st->codec.extradata_size = 0x5a + atom.size;
st->codec.extradata = (uint8_t*) av_mallocz(st->codec.extradata_size);
if (st->codec.extradata) {
strcpy(st->codec.extradata, "SVQ3"); // fake
get_buffer(pb, st->codec.extradata + 0x5a, atom.size);
//av_log(NULL, AV_LOG_DEBUG, "Reading SMI %Ld %s\n", atom.size, (char*)st->codec.extradata + 0x5a);
} else
url_fskip(pb, atom.size);
return 0;
}
static int mov_read_stco(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
AVStream *st = c->fc->streams[c->fc->nb_streams-1];
MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;
int entries, i;
print_atom("stco", atom);
get_byte(pb); /* version */
get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
entries = get_be32(pb);
sc->chunk_count = entries;
sc->chunk_offsets = (int64_t*) av_malloc(entries * sizeof(int64_t));
if (!sc->chunk_offsets)
return -1;
if (atom.type == MKTAG('s', 't', 'c', 'o')) {
for(i=0; i<entries; i++) {
sc->chunk_offsets[i] = get_be32(pb);
}
} else if (atom.type == MKTAG('c', 'o', '6', '4')) {
for(i=0; i<entries; i++) {
sc->chunk_offsets[i] = get_be64(pb);
}
} else
return -1;
#ifdef DEBUG
/*
for(i=0; i<entries; i++) {
av_log(NULL, AV_LOG_DEBUG, "chunk offset=0x%Lx\n", sc->chunk_offsets[i]);
}
*/
#endif
return 0;
}
static int mov_read_stsd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
AVStream *st = c->fc->streams[c->fc->nb_streams-1];
//MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;
int entries, frames_per_sample;
uint32_t format;
/* for palette traversal */
int color_depth;
int color_start;
int color_count;
int color_end;
int color_index;
int color_dec;
int color_greyscale;
unsigned char *color_table;
int j;
unsigned char r, g, b;
print_atom("stsd", atom);
get_byte(pb); /* version */
get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
entries = get_be32(pb);
while(entries--) { //Parsing Sample description table
enum CodecID id;
int size = get_be32(pb); /* size */
format = get_le32(pb); /* data format */
get_be32(pb); /* reserved */
get_be16(pb); /* reserved */
get_be16(pb); /* index */
/* for MPEG4: set codec type by looking for it */
id = codec_get_id(mov_video_tags, format);
if (id >= 0) {
AVCodec *codec;
codec = avcodec_find_decoder(id);
if (codec)
st->codec.codec_type = codec->type;
}
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "size=%d 4CC= %c%c%c%c codec_type=%d\n",
size,
(format >> 0) & 0xff,
(format >> 8) & 0xff,
(format >> 16) & 0xff,
(format >> 24) & 0xff,
st->codec.codec_type);
#endif
st->codec.codec_tag = format;
if(st->codec.codec_type==CODEC_TYPE_VIDEO) {
MOV_atom_t a = { 0, 0, 0 };
st->codec.codec_id = id;
get_be16(pb); /* version */
get_be16(pb); /* revision level */
get_be32(pb); /* vendor */
get_be32(pb); /* temporal quality */
get_be32(pb); /* spacial quality */
st->codec.width = get_be16(pb); /* width */
st->codec.height = get_be16(pb); /* height */
#if 1
if (st->codec.codec_id == CODEC_ID_MPEG4) {
/* in some MPEG4 the width/height are not correct, so
we ignore this info */
st->codec.width = 0;
st->codec.height = 0;
}
#endif
get_be32(pb); /* horiz resolution */
get_be32(pb); /* vert resolution */
get_be32(pb); /* data size, always 0 */
frames_per_sample = get_be16(pb); /* frames per samples */
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "frames/samples = %d\n", frames_per_sample);
#endif
get_buffer(pb, (uint8_t *)st->codec.codec_name, 32); /* codec name */
st->codec.bits_per_sample = get_be16(pb); /* depth */
st->codec.color_table_id = get_be16(pb); /* colortable id */
/* These are set in mov_read_stts and might already be set!
st->codec.frame_rate = 25;
st->codec.frame_rate_base = 1;
*/
size -= (16+8*4+2+32+2*2);
#if 0
while (size >= 8) {
MOV_atom_t a;
int64_t start_pos;
a.size = get_be32(pb);
a.type = get_le32(pb);
size -= 8;
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "VIDEO: atom_type=%c%c%c%c atom.size=%Ld size_left=%d\n",
(a.type >> 0) & 0xff,
(a.type >> 8) & 0xff,
(a.type >> 16) & 0xff,
(a.type >> 24) & 0xff,
a.size, size);
#endif
start_pos = url_ftell(pb);
switch(a.type) {
case MKTAG('e', 's', 'd', 's'):
{
int tag, len;
/* Well, broken but suffisant for some MP4 streams */
get_be32(pb); /* version + flags */
len = mov_mp4_read_descr(pb, &tag);
if (tag == 0x03) {
/* MP4ESDescrTag */
get_be16(pb); /* ID */
get_byte(pb); /* priority */
len = mov_mp4_read_descr(pb, &tag);
if (tag != 0x04)
goto fail;
/* MP4DecConfigDescrTag */
get_byte(pb); /* objectTypeId */
get_be32(pb); /* streamType + buffer size */
get_be32(pb); /* max bit rate */
get_be32(pb); /* avg bit rate */
len = mov_mp4_read_descr(pb, &tag);
if (tag != 0x05)
goto fail;
/* MP4DecSpecificDescrTag */
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "Specific MPEG4 header len=%d\n", len);
#endif
sc->header_data = av_mallocz(len);
if (sc->header_data) {
get_buffer(pb, sc->header_data, len);
sc->header_len = len;
}
}
/* in any case, skip garbage */
}
break;
default:
break;
}
fail:
av_log(NULL, AV_LOG_DEBUG, "ATOMENEWSIZE %Ld %d\n", atom.size, url_ftell(pb) - start_pos);
if (atom.size > 8) {
url_fskip(pb, (atom.size - 8) -
((url_ftell(pb) - start_pos)));
size -= atom.size - 8;
}
}
if (size > 0) {
/* unknown extension */
url_fskip(pb, size);
}
#else
/* figure out the palette situation */
color_depth = st->codec.bits_per_sample & 0x1F;
color_greyscale = st->codec.bits_per_sample & 0x20;
/* if the depth is 2, 4, or 8 bpp, file is palettized */
if ((color_depth == 2) || (color_depth == 4) ||
(color_depth == 8)) {
if (color_greyscale) {
/* compute the greyscale palette */
color_count = 1 << color_depth;
color_index = 255;
color_dec = 256 / (color_count - 1);
for (j = 0; j < color_count; j++) {
r = g = b = color_index;
c->palette_control.palette[j] =
(r << 16) | (g << 8) | (b);
color_index -= color_dec;
if (color_index < 0)
color_index = 0;
}
} else if (st->codec.color_table_id & 0x08) {
/* if flag bit 3 is set, use the default palette */
color_count = 1 << color_depth;
if (color_depth == 2)
color_table = ff_qt_default_palette_4;
else if (color_depth == 4)
color_table = ff_qt_default_palette_16;
else
color_table = ff_qt_default_palette_256;
for (j = 0; j < color_count; j++) {
r = color_table[j * 4 + 0];
g = color_table[j * 4 + 1];
b = color_table[j * 4 + 2];
c->palette_control.palette[j] =
(r << 16) | (g << 8) | (b);
}
} else {
/* load the palette from the file */
color_start = get_be32(pb);
color_count = get_be16(pb);
color_end = get_be16(pb);
for (j = color_start; j <= color_end; j++) {
/* each R, G, or B component is 16 bits;
* only use the top 8 bits; skip alpha bytes
* up front */
get_byte(pb);
get_byte(pb);
r = get_byte(pb);
get_byte(pb);
g = get_byte(pb);
get_byte(pb);
b = get_byte(pb);
get_byte(pb);
c->palette_control.palette[j] =
(r << 16) | (g << 8) | (b);
}
}
st->codec.palctrl = &c->palette_control;
st->codec.palctrl->palette_changed = 1;
} else
st->codec.palctrl = NULL;
a.size = size;
mov_read_default(c, pb, a);
#endif
} else {
st->codec.codec_id = codec_get_id(mov_audio_tags, format);
if(st->codec.codec_id==CODEC_ID_AMR_NB || st->codec.codec_id==CODEC_ID_AMR_WB) //from TS26.244
{
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "AMR-NB or AMR-WB audio identified!!\n");
#endif
get_be32(pb);get_be32(pb); //Reserved_8
get_be16(pb);//Reserved_2
get_be16(pb);//Reserved_2
get_be32(pb);//Reserved_4
get_be16(pb);//TimeScale
get_be16(pb);//Reserved_2
//AMRSpecificBox.(10 bytes)
get_be32(pb); //size
get_be32(pb); //type=='damr'
get_be32(pb); //vendor
get_byte(pb); //decoder version
get_be16(pb); //mode_set
get_byte(pb); //mode_change_period
get_byte(pb); //frames_per_sample
st->duration = AV_NOPTS_VALUE;//Not possible to get from this info, must count number of AMR frames
if(st->codec.codec_id==CODEC_ID_AMR_NB)
{
st->codec.sample_rate=8000;
st->codec.channels=1;
}
else //AMR-WB
{
st->codec.sample_rate=16000;
st->codec.channels=1;
}
st->codec.bits_per_sample=16;
st->codec.bit_rate=0; /*It is not possible to tell this before we have
an audio frame and even then every frame can be different*/
}
else if( st->codec.codec_tag == MKTAG( 'm', 'p', '4', 's' ))
{
//This is some stuff for the hint track, lets ignore it!
//Do some mp4 auto detect.
c->mp4=1;
size-=(16);
url_fskip(pb, size); /* The mp4s atom also contians a esds atom that we can skip*/
}
else if( st->codec.codec_tag == MKTAG( 'm', 'p', '4', 'a' ))
{
/* Handle mp4 audio tag */
get_be32(pb); /* version */
get_be32(pb);
st->codec.channels = get_be16(pb); /* channels */
st->codec.bits_per_sample = get_be16(pb); /* bits per sample */
get_be32(pb);
st->codec.sample_rate = get_be16(pb); /* sample rate, not always correct */
get_be16(pb);
c->mp4=1;
{
MOV_atom_t a = { format, url_ftell(pb), size - (20 + 20 + 8) };
mov_read_default(c, pb, a);
}
/* Get correct sample rate from extradata */
if(st->codec.extradata_size) {
const int samplerate_table[] = {
96000, 88200, 64000, 48000, 44100, 32000,
24000, 22050, 16000, 12000, 11025, 8000,
7350, 0, 0, 0
};
unsigned char *px = st->codec.extradata;
// 5 bits objectTypeIndex, 4 bits sampleRateIndex, 4 bits channels
int samplerate_index = ((px[0] & 7) << 1) + ((px[1] >> 7) & 1);
st->codec.sample_rate = samplerate_table[samplerate_index];
}
}
else if(size>=(16+20))
{//16 bytes read, reading atleast 20 more
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "audio size=0x%X\n",size);
#endif
uint16_t version = get_be16(pb); /* version */
get_be16(pb); /* revision level */
get_be32(pb); /* vendor */
st->codec.channels = get_be16(pb); /* channel count */
st->codec.bits_per_sample = get_be16(pb); /* sample size */
/* handle specific s8 codec */
get_be16(pb); /* compression id = 0*/
get_be16(pb); /* packet size = 0 */
st->codec.sample_rate = ((get_be32(pb) >> 16));
//av_log(NULL, AV_LOG_DEBUG, "CODECID %d %d %.4s\n", st->codec.codec_id, CODEC_ID_PCM_S16BE, (char*)&format);
switch (st->codec.codec_id) {
case CODEC_ID_PCM_S16BE:
if (st->codec.bits_per_sample == 8)
st->codec.codec_id = CODEC_ID_PCM_S8;
/* fall */
case CODEC_ID_PCM_U8:
st->codec.bit_rate = st->codec.sample_rate * 8;
break;
default:
;
}
//Read QT version 1 fields. In version 0 theese dont exist
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "version =%d mp4=%d\n",version,c->mp4);
av_log(NULL, AV_LOG_DEBUG, "size-(16+20+16)=%d\n",size-(16+20+16));
#endif
if((version==1) && size>=(16+20+16))
{
get_be32(pb); /* samples per packet */
get_be32(pb); /* bytes per packet */
get_be32(pb); /* bytes per frame */
get_be32(pb); /* bytes per sample */
if(size>(16+20+16))
{
//Optional, additional atom-based fields
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "offest=0x%X, sizeleft=%d=0x%x,format=%c%c%c%c\n",(int)url_ftell(pb),size - (16 + 20 + 16 ),size - (16 + 20 + 16 ),
(format >> 0) & 0xff,
(format >> 8) & 0xff,
(format >> 16) & 0xff,
(format >> 24) & 0xff);
#endif
MOV_atom_t a = { format, url_ftell(pb), size - (16 + 20 + 16 + 8) };
mov_read_default(c, pb, a);
}
}
else
{
//We should be down to 0 bytes here, but lets make sure.
size-=(16+20);
#ifdef DEBUG
if(size>0)
av_log(NULL, AV_LOG_DEBUG, "skipping 0x%X bytes\n",size-(16+20));
#endif
url_fskip(pb, size);
}
}
else
{
size-=16;
//Unknown size, but lets do our best and skip the rest.
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "Strange size, skipping 0x%X bytes\n",size);
#endif
url_fskip(pb, size);
}
}
}
return 0;
}
static int mov_read_stsc(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
AVStream *st = c->fc->streams[c->fc->nb_streams-1];
MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;
int entries, i;
print_atom("stsc", atom);
get_byte(pb); /* version */
get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
entries = get_be32(pb);
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "track[%i].stsc.entries = %i\n", c->fc->nb_streams-1, entries);
#endif
sc->sample_to_chunk_sz = entries;
sc->sample_to_chunk = (MOV_sample_to_chunk_tbl*) av_malloc(entries * sizeof(MOV_sample_to_chunk_tbl));
if (!sc->sample_to_chunk)
return -1;
for(i=0; i<entries; i++) {
sc->sample_to_chunk[i].first = get_be32(pb);
sc->sample_to_chunk[i].count = get_be32(pb);
sc->sample_to_chunk[i].id = get_be32(pb);
#ifdef DEBUG
/* av_log(NULL, AV_LOG_DEBUG, "sample_to_chunk first=%ld count=%ld, id=%ld\n", sc->sample_to_chunk[i].first, sc->sample_to_chunk[i].count, sc->sample_to_chunk[i].id); */
#endif
}
return 0;
}
static int mov_read_stss(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
AVStream *st = c->fc->streams[c->fc->nb_streams-1];
MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;
int entries, i;
print_atom("stss", atom);
get_byte(pb); /* version */
get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
entries = get_be32(pb);
sc->keyframe_count = entries;
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "keyframe_count = %ld\n", sc->keyframe_count);
#endif
sc->keyframes = (long*) av_malloc(entries * sizeof(long));
if (!sc->keyframes)
return -1;
for(i=0; i<entries; i++) {
sc->keyframes[i] = get_be32(pb);
#ifdef DEBUG
/* av_log(NULL, AV_LOG_DEBUG, "keyframes[]=%ld\n", sc->keyframes[i]); */
#endif
}
return 0;
}
static int mov_read_stsz(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
AVStream *st = c->fc->streams[c->fc->nb_streams-1];
MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;
int entries, i;
print_atom("stsz", atom);
get_byte(pb); /* version */
get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
sc->sample_size = get_be32(pb);
entries = get_be32(pb);
sc->sample_count = entries;
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "sample_size = %ld sample_count = %ld\n", sc->sample_size, sc->sample_count);
#endif
if(sc->sample_size)
return 0; /* there isn't any table following */
sc->sample_sizes = (long*) av_malloc(entries * sizeof(long));
if (!sc->sample_sizes)
return -1;
for(i=0; i<entries; i++) {
sc->sample_sizes[i] = get_be32(pb);
#ifdef DEBUG
/* av_log(NULL, AV_LOG_DEBUG, "sample_sizes[]=%ld\n", sc->sample_sizes[i]); */
#endif
}
return 0;
}
static int mov_read_stts(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
AVStream *st = c->fc->streams[c->fc->nb_streams-1];
//MOVStreamContext *sc = (MOVStreamContext *)st->priv_data;
int entries, i;
int64_t duration=0;
int64_t total_sample_count=0;
print_atom("stts", atom);
get_byte(pb); /* version */
get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
entries = get_be32(pb);
c->streams[c->fc->nb_streams-1]->stts_count = entries;
c->streams[c->fc->nb_streams-1]->stts_data = (uint64_t*) av_malloc(entries * sizeof(uint64_t));
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "track[%i].stts.entries = %i\n", c->fc->nb_streams-1, entries);
#endif
for(i=0; i<entries; i++) {
int32_t sample_duration;
int32_t sample_count;
sample_count=get_be32(pb);
sample_duration = get_be32(pb);
c->streams[c->fc->nb_streams - 1]->stts_data[i] = (uint64_t)sample_count<<32 | (uint64_t)sample_duration;
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "sample_count=%d, sample_duration=%d\n",sample_count,sample_duration);
#endif
duration+=sample_duration*sample_count;
total_sample_count+=sample_count;
#if 0 //We calculate an average instead, needed by .mp4-files created with nec e606 3g phone
if (!i && st->codec.codec_type==CODEC_TYPE_VIDEO) {
st->codec.frame_rate_base = sample_duration ? sample_duration : 1;
st->codec.frame_rate = c->streams[c->fc->nb_streams-1]->time_scale;
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "VIDEO FRAME RATE= %i (sd= %i)\n", st->codec.frame_rate, sample_duration);
#endif
}
#endif
}
/*The stsd atom which contain codec type sometimes comes after the stts so we cannot check for codec_type*/
if(duration>0)
{
av_reduce(
&st->codec.frame_rate,
&st->codec.frame_rate_base,
c->streams[c->fc->nb_streams-1]->time_scale * total_sample_count,
duration,
INT_MAX
);
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "FRAME RATE average (video or audio)= %f (tot sample count= %i ,tot dur= %i timescale=%d)\n", (float)st->codec.frame_rate/st->codec.frame_rate_base,total_sample_count,duration,c->streams[c->fc->nb_streams-1]->time_scale);
#endif
}
else
{
st->codec.frame_rate_base = 1;
st->codec.frame_rate = c->streams[c->fc->nb_streams-1]->time_scale;
}
return 0;
}
static int mov_read_trak(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
AVStream *st;
MOVStreamContext *sc;
print_atom("trak", atom);
st = av_new_stream(c->fc, c->fc->nb_streams);
if (!st) return -2;
sc = (MOVStreamContext*) av_mallocz(sizeof(MOVStreamContext));
if (!sc) {
av_free(st);
return -1;
}
sc->sample_to_chunk_index = -1;
st->priv_data = sc;
st->codec.codec_type = CODEC_TYPE_MOV_OTHER;
st->start_time = 0; /* XXX: check */
st->duration = (c->duration * (int64_t)AV_TIME_BASE) / c->time_scale;
c->streams[c->fc->nb_streams-1] = sc;
return mov_read_default(c, pb, atom);
}
static int mov_read_tkhd(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
AVStream *st;
print_atom("tkhd", atom);
st = c->fc->streams[c->fc->nb_streams-1];
get_byte(pb); /* version */
get_byte(pb); get_byte(pb);
get_byte(pb); /* flags */
/*
MOV_TRACK_ENABLED 0x0001
MOV_TRACK_IN_MOVIE 0x0002
MOV_TRACK_IN_PREVIEW 0x0004
MOV_TRACK_IN_POSTER 0x0008
*/
get_be32(pb); /* creation time */
get_be32(pb); /* modification time */
st->id = (int)get_be32(pb); /* track id (NOT 0 !)*/
get_be32(pb); /* reserved */
st->start_time = 0; /* check */
st->duration = (get_be32(pb) * (int64_t)AV_TIME_BASE) / c->time_scale; /* duration */
get_be32(pb); /* reserved */
get_be32(pb); /* reserved */
get_be16(pb); /* layer */
get_be16(pb); /* alternate group */
get_be16(pb); /* volume */
get_be16(pb); /* reserved */
url_fskip(pb, 36); /* display matrix */
/* those are fixed-point */
st->codec.width = get_be32(pb) >> 16; /* track width */
st->codec.height = get_be32(pb) >> 16; /* track height */
return 0;
}
/* this atom should be null (from specs), but some buggy files put the 'moov' atom inside it... */
/* like the files created with Adobe Premiere 5.0, for samples see */
/* http://graphics.tudelft.nl/~wouter/publications/soundtests/ */
static int mov_read_wide(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
int err;
#ifdef DEBUG
print_atom("wide", atom);
debug_indent++;
#endif
if (atom.size < 8)
return 0; /* continue */
if (get_be32(pb) != 0) { /* 0 sized mdat atom... use the 'wide' atom size */
url_fskip(pb, atom.size - 4);
return 0;
}
atom.type = get_le32(pb);
atom.offset += 8;
atom.size -= 8;
if (atom.type != MKTAG('m', 'd', 'a', 't')) {
url_fskip(pb, atom.size);
return 0;
}
err = mov_read_mdat(c, pb, atom);
#ifdef DEBUG
debug_indent--;
#endif
return err;
}
#ifdef CONFIG_ZLIB
static int null_read_packet(void *opaque, uint8_t *buf, int buf_size)
{
return -1;
}
static int mov_read_cmov(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
ByteIOContext ctx;
uint8_t *cmov_data;
uint8_t *moov_data; /* uncompressed data */
long cmov_len, moov_len;
int ret;
print_atom("cmov", atom);
get_be32(pb); /* dcom atom */
if (get_le32(pb) != MKTAG( 'd', 'c', 'o', 'm' ))
return -1;
if (get_le32(pb) != MKTAG( 'z', 'l', 'i', 'b' )) {
av_log(NULL, AV_LOG_DEBUG, "unknown compression for cmov atom !");
return -1;
}
get_be32(pb); /* cmvd atom */
if (get_le32(pb) != MKTAG( 'c', 'm', 'v', 'd' ))
return -1;
moov_len = get_be32(pb); /* uncompressed size */
cmov_len = atom.size - 6 * 4;
cmov_data = (uint8_t *) av_malloc(cmov_len);
if (!cmov_data)
return -1;
moov_data = (uint8_t *) av_malloc(moov_len);
if (!moov_data) {
av_free(cmov_data);
return -1;
}
get_buffer(pb, cmov_data, cmov_len);
if(uncompress (moov_data, (uLongf *) &moov_len, (const Bytef *)cmov_data, cmov_len) != Z_OK)
return -1;
if(init_put_byte(&ctx, moov_data, moov_len, 0, NULL, null_read_packet, NULL, NULL) != 0)
return -1;
ctx.buf_end = ctx.buffer + moov_len;
atom.type = MKTAG( 'm', 'o', 'o', 'v' );
atom.offset = 0;
atom.size = moov_len;
#ifdef DEBUG
{ int fd = open("/tmp/uncompheader.mov", O_WRONLY | O_CREAT); write(fd, moov_data, moov_len); close(fd); }
#endif
ret = mov_read_default(c, &ctx, atom);
av_free(moov_data);
av_free(cmov_data);
return ret;
}
#endif
/* edit list atom */
static int mov_read_elst(MOVContext *c, ByteIOContext *pb, MOV_atom_t atom)
{
int i, edit_count;
print_atom("elst", atom);
get_byte(pb); /* version */
get_byte(pb); get_byte(pb); get_byte(pb); /* flags */
edit_count= c->streams[c->fc->nb_streams-1]->edit_count = get_be32(pb); /* entries */
for(i=0; i<edit_count; i++){
get_be32(pb); /* Track duration */
get_be32(pb); /* Media time */
get_be32(pb); /* Media rate */
}
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "track[%i].edit_count = %i\n", c->fc->nb_streams-1, c->streams[c->fc->nb_streams-1]->edit_count);
#endif
return 0;
}
static const MOVParseTableEntry mov_default_parse_table[] = {
/* mp4 atoms */
{ MKTAG( 'c', 'o', '6', '4' ), mov_read_stco },
{ MKTAG( 'c', 'p', 'r', 't' ), mov_read_default },
{ MKTAG( 'c', 'r', 'h', 'd' ), mov_read_default },
{ MKTAG( 'c', 't', 't', 's' ), mov_read_leaf }, /* composition time to sample */
{ MKTAG( 'd', 'i', 'n', 'f' ), mov_read_default }, /* data information */
{ MKTAG( 'd', 'p', 'n', 'd' ), mov_read_leaf },
{ MKTAG( 'd', 'r', 'e', 'f' ), mov_read_leaf },
{ MKTAG( 'e', 'd', 't', 's' ), mov_read_default },
{ MKTAG( 'e', 'l', 's', 't' ), mov_read_elst },
{ MKTAG( 'f', 'r', 'e', 'e' ), mov_read_leaf },
{ MKTAG( 'h', 'd', 'l', 'r' ), mov_read_hdlr },
{ MKTAG( 'h', 'i', 'n', 't' ), mov_read_leaf },
{ MKTAG( 'h', 'm', 'h', 'd' ), mov_read_leaf },
{ MKTAG( 'i', 'o', 'd', 's' ), mov_read_leaf },
{ MKTAG( 'm', 'd', 'a', 't' ), mov_read_mdat },
{ MKTAG( 'm', 'd', 'h', 'd' ), mov_read_mdhd },
{ MKTAG( 'm', 'd', 'i', 'a' ), mov_read_default },
{ MKTAG( 'm', 'i', 'n', 'f' ), mov_read_default },
{ MKTAG( 'm', 'o', 'o', 'v' ), mov_read_moov },
{ MKTAG( 'm', 'p', '4', 'a' ), mov_read_default },
{ MKTAG( 'm', 'p', '4', 's' ), mov_read_default },
{ MKTAG( 'm', 'p', '4', 'v' ), mov_read_default },
{ MKTAG( 'm', 'p', 'o', 'd' ), mov_read_leaf },
{ MKTAG( 'm', 'v', 'h', 'd' ), mov_read_mvhd },
{ MKTAG( 'n', 'm', 'h', 'd' ), mov_read_leaf },
{ MKTAG( 'o', 'd', 'h', 'd' ), mov_read_default },
{ MKTAG( 's', 'd', 'h', 'd' ), mov_read_default },
{ MKTAG( 's', 'k', 'i', 'p' ), mov_read_leaf },
{ MKTAG( 's', 'm', 'h', 'd' ), mov_read_leaf }, /* sound media info header */
{ MKTAG( 'S', 'M', 'I', ' ' ), mov_read_smi }, /* Sorrenson extension ??? */
{ MKTAG( 's', 't', 'b', 'l' ), mov_read_default },
{ MKTAG( 's', 't', 'c', 'o' ), mov_read_stco },
{ MKTAG( 's', 't', 'd', 'p' ), mov_read_default },
{ MKTAG( 's', 't', 's', 'c' ), mov_read_stsc },
{ MKTAG( 's', 't', 's', 'd' ), mov_read_stsd }, /* sample description */
{ MKTAG( 's', 't', 's', 'h' ), mov_read_default },
{ MKTAG( 's', 't', 's', 's' ), mov_read_stss }, /* sync sample */
{ MKTAG( 's', 't', 's', 'z' ), mov_read_stsz }, /* sample size */
{ MKTAG( 's', 't', 't', 's' ), mov_read_stts },
{ MKTAG( 't', 'k', 'h', 'd' ), mov_read_tkhd }, /* track header */
{ MKTAG( 't', 'r', 'a', 'k' ), mov_read_trak },
{ MKTAG( 't', 'r', 'e', 'f' ), mov_read_default }, /* not really */
{ MKTAG( 'u', 'd', 't', 'a' ), mov_read_leaf },
{ MKTAG( 'u', 'r', 'l', ' ' ), mov_read_leaf },
{ MKTAG( 'u', 'r', 'n', ' ' ), mov_read_leaf },
{ MKTAG( 'u', 'u', 'i', 'd' ), mov_read_default },
{ MKTAG( 'v', 'm', 'h', 'd' ), mov_read_leaf }, /* video media info header */
{ MKTAG( 'w', 'a', 'v', 'e' ), mov_read_default },
/* extra mp4 */
{ MKTAG( 'M', 'D', 'E', 'S' ), mov_read_leaf },
/* QT atoms */
{ MKTAG( 'c', 'h', 'a', 'p' ), mov_read_leaf },
{ MKTAG( 'c', 'l', 'i', 'p' ), mov_read_default },
{ MKTAG( 'c', 'r', 'g', 'n' ), mov_read_leaf },
{ MKTAG( 'c', 't', 'a', 'b' ), mov_read_ctab },
{ MKTAG( 'e', 's', 'd', 's' ), mov_read_esds },
{ MKTAG( 'k', 'm', 'a', 't' ), mov_read_leaf },
{ MKTAG( 'm', 'a', 't', 't' ), mov_read_default },
{ MKTAG( 'r', 'd', 'r', 'f' ), mov_read_leaf },
{ MKTAG( 'r', 'm', 'd', 'a' ), mov_read_default },
{ MKTAG( 'r', 'm', 'd', 'r' ), mov_read_leaf },
{ MKTAG( 'r', 'm', 'r', 'a' ), mov_read_default },
{ MKTAG( 's', 'c', 'p', 't' ), mov_read_leaf },
{ MKTAG( 's', 's', 'r', 'c' ), mov_read_leaf },
{ MKTAG( 's', 'y', 'n', 'c' ), mov_read_leaf },
{ MKTAG( 't', 'c', 'm', 'd' ), mov_read_leaf },
{ MKTAG( 'w', 'i', 'd', 'e' ), mov_read_wide }, /* place holder */
//{ MKTAG( 'r', 'm', 'q', 'u' ), mov_read_leaf },
#ifdef CONFIG_ZLIB
{ MKTAG( 'c', 'm', 'o', 'v' ), mov_read_cmov },
#else
{ MKTAG( 'c', 'm', 'o', 'v' ), mov_read_leaf },
#endif
{ 0L, mov_read_leaf }
};
static void mov_free_stream_context(MOVStreamContext *sc)
{
if(sc) {
av_free(sc->chunk_offsets);
av_free(sc->sample_to_chunk);
av_free(sc->sample_sizes);
av_free(sc->keyframes);
av_free(sc->header_data);
av_free(sc->stts_data);
av_free(sc);
}
}
static inline uint32_t mov_to_tag(uint8_t *buf)
{
return MKTAG(buf[0], buf[1], buf[2], buf[3]);
}
static inline uint32_t to_be32(uint8_t *buf)
{
return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3];
}
/* XXX: is it sufficient ? */
static int mov_probe(AVProbeData *p)
{
unsigned int offset;
uint32_t tag;
/* check file header */
if (p->buf_size <= 12)
return 0;
offset = 0;
for(;;) {
/* ignore invalid offset */
if ((offset + 8) > (unsigned int)p->buf_size)
return 0;
tag = mov_to_tag(p->buf + offset + 4);
switch(tag) {
case MKTAG( 'm', 'o', 'o', 'v' ):
case MKTAG( 'w', 'i', 'd', 'e' ):
case MKTAG( 'f', 'r', 'e', 'e' ):
case MKTAG( 'm', 'd', 'a', 't' ):
case MKTAG( 'p', 'n', 'o', 't' ): /* detect movs with preview pics like ew.mov and april.mov */
case MKTAG( 'u', 'd', 't', 'a' ): /* Packet Video PVAuthor adds this and a lot of more junk */
return AVPROBE_SCORE_MAX;
case MKTAG( 'f', 't', 'y', 'p' ):
case MKTAG( 's', 'k', 'i', 'p' ):
offset = to_be32(p->buf+offset) + offset;
break;
default:
/* unrecognized tag */
return 0;
}
}
return 0;
}
static int mov_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
MOVContext *mov = (MOVContext *) s->priv_data;
ByteIOContext *pb = &s->pb;
int i, j, nb, err;
MOV_atom_t atom = { 0, 0, 0 };
mov->fc = s;
mov->parse_table = mov_default_parse_table;
#if 0
/* XXX: I think we should auto detect */
if(s->iformat->name[1] == 'p')
mov->mp4 = 1;
#endif
if(!url_is_streamed(pb)) /* .mov and .mp4 aren't streamable anyway (only progressive download if moov is before mdat) */
atom.size = url_filesize(url_fileno(pb));
else
atom.size = 0x7FFFFFFFFFFFFFFFLL;
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "filesz=%Ld\n", atom.size);
#endif
/* check MOV header */
err = mov_read_default(mov, pb, atom);
if (err<0 || (!mov->found_moov && !mov->found_mdat)) {
av_log(s, AV_LOG_ERROR, "mov: header not found !!! (err:%d, moov:%d, mdat:%d) pos:%lld\n",
err, mov->found_moov, mov->found_mdat, url_ftell(pb));
return -1;
}
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "on_parse_exit_offset=%d\n", (int) url_ftell(pb));
#endif
/* some cleanup : make sure we are on the mdat atom */
if(!url_is_streamed(pb) && (url_ftell(pb) != mov->mdat_offset))
url_fseek(pb, mov->mdat_offset, SEEK_SET);
mov->next_chunk_offset = mov->mdat_offset; /* initialise reading */
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "mdat_reset_offset=%d\n", (int) url_ftell(pb));
#endif
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "streams= %d\n", s->nb_streams);
#endif
mov->total_streams = nb = s->nb_streams;
#if 1
for(i=0; i<s->nb_streams;) {
if(s->streams[i]->codec.codec_type == CODEC_TYPE_MOV_OTHER) {/* not audio, not video, delete */
av_free(s->streams[i]);
for(j=i+1; j<s->nb_streams; j++)
s->streams[j-1] = s->streams[j];
s->nb_streams--;
} else
i++;
}
for(i=0; i<s->nb_streams;i++) {
MOVStreamContext *sc;
sc = (MOVStreamContext *)s->streams[i]->priv_data;
sc->ffindex = i;
sc->is_ff_stream = 1;
}
#endif
#ifdef DEBUG
av_log(NULL, AV_LOG_DEBUG, "real streams= %d\n", s->nb_streams);
#endif
return 0;
}
/* Yes, this is ugly... I didn't write the specs of QT :p */
/* XXX:remove useless commented code sometime */
static int mov_read_packet(AVFormatContext *s, AVPacket *pkt)
{
MOVContext *mov = (MOVContext *) s->priv_data;
MOVStreamContext *sc;
int64_t offset = 0x0FFFFFFFFFFFFFFFLL;
int i, a, b, m;
int size;
size = 0x0FFFFFFF;
#ifdef MOV_SPLIT_CHUNKS
if (mov->partial) {
int idx;
sc = mov->partial;
idx = sc->sample_to_chunk_index;
if (idx < 0) return 0;
size = sc->sample_sizes[sc->current_sample];
sc->current_sample++;
sc->left_in_chunk--;
if (sc->left_in_chunk <= 0)
mov->partial = 0;
offset = mov->next_chunk_offset;
/* extract the sample */
goto readchunk;
}
#endif
again:
sc = 0;
for(i=0; i<mov->total_streams; i++) {
MOVStreamContext *msc = mov->streams[i];
//av_log(NULL, AV_LOG_DEBUG, "MOCHUNK %ld %d %p pos:%Ld\n", mov->streams[i]->next_chunk, mov->total_streams, mov->streams[i], url_ftell(&s->pb));
if ((msc->next_chunk < msc->chunk_count) && msc->next_chunk >= 0
&& (msc->chunk_offsets[msc->next_chunk] < offset)) {
sc = msc;
offset = msc->chunk_offsets[msc->next_chunk];
//av_log(NULL, AV_LOG_DEBUG, "SELETED %Ld i:%d\n", offset, i);
}
}
if (!sc || offset==0x0FFFFFFFFFFFFFFFLL)
return -1;
sc->next_chunk++;
if(mov->next_chunk_offset < offset) { /* some meta data */
url_fskip(&s->pb, (offset - mov->next_chunk_offset));
mov->next_chunk_offset = offset;
}
//av_log(NULL, AV_LOG_DEBUG, "chunk: [%i] %lli -> %lli\n", st_id, mov->next_chunk_offset, offset);
if(!sc->is_ff_stream) {
url_fskip(&s->pb, (offset - mov->next_chunk_offset));
mov->next_chunk_offset = offset;
offset = 0x0FFFFFFFFFFFFFFFLL;
goto again;
}
/* now get the chunk size... */
for(i=0; i<mov->total_streams; i++) {
MOVStreamContext *msc = mov->streams[i];
if ((msc->next_chunk < msc->chunk_count)
&& ((msc->chunk_offsets[msc->next_chunk] - offset) < size))
size = msc->chunk_offsets[msc->next_chunk] - offset;
}
#ifdef MOV_MINOLTA_FIX
//Make sure that size is according to sample_size (Needed by .mov files
//created on a Minolta Dimage Xi where audio chunks contains waste data in the end)
//Maybe we should really not only check sc->sample_size, but also sc->sample_sizes
//but I have no such movies
if (sc->sample_size > 0) {
int foundsize=0;
for(i=0; i<(sc->sample_to_chunk_sz); i++) {
if( (sc->sample_to_chunk[i].first)<=(sc->next_chunk) && (sc->sample_size>0) )
{
// I can't figure out why for PCM audio sample_size is always 1
// (it should actually be channels*bits_per_second/8) but it is.
AVCodecContext* cod = &s->streams[sc->ffindex]->codec;
if (sc->sample_size == 1 && (cod->codec_id == CODEC_ID_PCM_S16BE || cod->codec_id == CODEC_ID_PCM_S16LE))
foundsize=(sc->sample_to_chunk[i].count*cod->channels*cod->bits_per_sample)/8;
else
foundsize=sc->sample_to_chunk[i].count*sc->sample_size;
}
#ifdef DEBUG
/*av_log(NULL, AV_LOG_DEBUG, "sample_to_chunk first=%ld count=%ld, id=%ld\n", sc->sample_to_chunk[i].first, sc->sample_to_chunk[i].count, sc->sample_to_chunk[i].id);*/
#endif
}
if( (foundsize>0) && (foundsize<size) )
{
#ifdef DEBUG
/*av_log(NULL, AV_LOG_DEBUG, "this size should actually be %d\n",foundsize);*/
#endif
size=foundsize;
}
}
#endif //MOV_MINOLTA_FIX
#ifdef MOV_SPLIT_CHUNKS
/* split chunks into samples */
if (sc->sample_size == 0) {
int idx = sc->sample_to_chunk_index;
if ((idx + 1 < sc->sample_to_chunk_sz)
&& (sc->next_chunk >= sc->sample_to_chunk[idx + 1].first))
idx++;
sc->sample_to_chunk_index = idx;
if (idx >= 0 && sc->sample_to_chunk[idx].count != 1) {
mov->partial = sc;
/* we'll have to get those samples before next chunk */
sc->left_in_chunk = sc->sample_to_chunk[idx].count - 1;
size = sc->sample_sizes[sc->current_sample];
}
sc->current_sample++;
}
#endif
readchunk:
//av_log(NULL, AV_LOG_DEBUG, "chunk: [%i] %lli -> %lli (%i)\n", st_id, offset, offset + size, size);
if(size == 0x0FFFFFFF)
size = mov->mdat_size + mov->mdat_offset - offset;
if(size < 0)
return -1;
if(size == 0)
return -1;
url_fseek(&s->pb, offset, SEEK_SET);
//av_log(NULL, AV_LOG_DEBUG, "READCHUNK hlen: %d %d off: %Ld pos:%Ld\n", size, sc->header_len, offset, url_ftell(&s->pb));
if (sc->header_len > 0) {
av_new_packet(pkt, size + sc->header_len);
memcpy(pkt->data, sc->header_data, sc->header_len);
get_buffer(&s->pb, pkt->data + sc->header_len, size);
/* free header */
av_freep(&sc->header_data);
sc->header_len = 0;
} else {
av_new_packet(pkt, size);
get_buffer(&s->pb, pkt->data, pkt->size);
}
pkt->stream_index = sc->ffindex;
// If the keyframes table exists, mark any samples that are in the table as key frames.
// If no table exists, treat very sample as a key frame.
if (sc->keyframes) {
a = 0;
b = sc->keyframe_count - 1;
while (a < b) {
m = (a + b + 1) >> 1;
if (sc->keyframes[m] > sc->current_sample) {
b = m - 1;
} else {
a = m;
}
}
if (sc->keyframes[a] == sc->current_sample)
pkt->flags |= PKT_FLAG_KEY;
}
else
pkt->flags |= PKT_FLAG_KEY;
#ifdef DEBUG
/*
av_log(NULL, AV_LOG_DEBUG, "Packet (%d, %d, %ld) ", pkt->stream_index, st_id, pkt->size);
for(i=0; i<8; i++)
av_log(NULL, AV_LOG_DEBUG, "%02x ", pkt->data[i]);
for(i=0; i<8; i++)
av_log(NULL, AV_LOG_DEBUG, "%c ", (pkt->data[i]) & 0x7F);
puts("");
*/
#endif
mov->next_chunk_offset = offset + size;
return 0;
}
#if defined(MOV_SPLIT_CHUNKS) && defined(MOV_SEEK)
/**
* Seek method based on the one described in the Appendix C of QTFileFormat.pdf
*/
static int mov_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp)
{
MOVContext* mov = (MOVContext *) s->priv_data;
MOVStreamContext* sc;
int32_t i, a, b, m;
int64_t sample_time;
int64_t start_time;
int32_t seek_sample, sample;
int32_t duration;
int32_t count;
int32_t chunk;
int32_t left_in_chunk;
int64_t chunk_file_offset;
int64_t sample_file_offset;
int32_t first_chunk_sample;
int32_t sample_to_chunk_idx;
int mov_idx;
// Find the corresponding mov stream
for (mov_idx = 0; mov_idx < mov->total_streams; mov_idx++)
if (mov->streams[mov_idx]->ffindex == stream_index)
break;
if (mov_idx == mov->total_streams) {
av_log(s, AV_LOG_ERROR, "mov: requested stream was not found in mov streams (idx=%i)\n", stream_index);
return -1;
}
sc = mov->streams[mov_idx];
// Step 1. Find the edit that contains the requested time (elst)
if (sc->edit_count) {
// FIXME should handle edit list
av_log(s, AV_LOG_ERROR, "mov: does not handle seeking in files that contain edit list (c:%d)\n", sc->edit_count);
return -1;
}
// Step 2. Find the corresponding sample using the Time-to-sample atom (stts) */
#ifdef DEBUG
av_log(s, AV_LOG_DEBUG, "Searching for time %li in stream #%i (time_scale=%i)\n", (long)timestamp, mov_idx, sc->time_scale);
#endif
// convert timestamp from time_base unit to timescale unit
sample_time = av_rescale( timestamp,
(int64_t)sc->time_scale * s->streams[stream_index]->time_base.num,
(int64_t)s->streams[stream_index]->time_base.den);
start_time = 0; // FIXME use elst atom
sample = 1; // sample are 0 based in table
#ifdef DEBUG
av_log(s, AV_LOG_DEBUG, "Searching for sample_time %li \n", (long)sample_time);
#endif
for (i = 0; i < sc->stts_count; i++) {
count = (uint32_t)(sc->stts_data[i]>>32);
duration = (uint32_t)(sc->stts_data[i]&0xffff);
//av_log(s, AV_LOG_DEBUG, "> sample_time %lli \n", (long)sample_time);
//av_log(s, AV_LOG_DEBUG, "> count=%i duration=%i\n", count, duration);
if ((start_time + count*duration) > sample_time) {
sample += (sample_time - start_time) / duration;
break;
}
sample += count;
start_time += count * duration;
}
/* NOTE: despite what qt doc say, the dt value (Display Time in qt vocabulary) computed with the stts atom
is a decoding time stamp (dts) not a presentation time stamp. And as usual dts != pts for stream with b frames */
#ifdef DEBUG
av_log(s, AV_LOG_DEBUG, "Found time %li at sample #%u\n", (long)sample_time, sample);
#endif
if (sample > sc->sample_count) {
av_log(s, AV_LOG_ERROR, "mov: sample pos is too high, unable to seek (req. sample=%i, sample count=%ld)\n", sample, sc->sample_count);
return -1;
}
// Step 3. Find the prior sync. sample using the Sync sample atom (stss)
if (sc->keyframes) {
a = 0;
b = sc->keyframe_count - 1;
while (a < b) {
m = (a + b + 1) >> 1;
if (sc->keyframes[m] > sample) {
b = m - 1;
} else {
a = m;
}
#ifdef DEBUG
// av_log(s, AV_LOG_DEBUG, "a=%i (%i) b=%i (%i) m=%i (%i) stream #%i\n", a, sc->keyframes[a], b, sc->keyframes[b], m, sc->keyframes[m], mov_idx);
#endif
}
seek_sample = sc->keyframes[a];
}
else
seek_sample = sample; // else all samples are key frames
#ifdef DEBUG
av_log(s, AV_LOG_DEBUG, "Found nearest keyframe at sample #%i \n", seek_sample);
#endif
// Step 4. Find the chunk of the sample using the Sample-to-chunk-atom (stsc)
for (first_chunk_sample = 1, i = 0; i < (sc->sample_to_chunk_sz - 1); i++) {
b = (sc->sample_to_chunk[i + 1].first - sc->sample_to_chunk[i].first) * sc->sample_to_chunk[i].count;
if (seek_sample >= first_chunk_sample && seek_sample < (first_chunk_sample + b))
break;
first_chunk_sample += b;
}
chunk = sc->sample_to_chunk[i].first + (seek_sample - first_chunk_sample) / sc->sample_to_chunk[i].count;
left_in_chunk = sc->sample_to_chunk[i].count - (seek_sample - first_chunk_sample) % sc->sample_to_chunk[i].count;
first_chunk_sample += ((seek_sample - first_chunk_sample) / sc->sample_to_chunk[i].count) * sc->sample_to_chunk[i].count;
sample_to_chunk_idx = i;
#ifdef DEBUG
av_log(s, AV_LOG_DEBUG, "Sample was found in chunk #%i at sample offset %i (idx %i)\n", chunk, seek_sample - first_chunk_sample, sample_to_chunk_idx);
#endif
// Step 5. Find the offset of the chunk using the chunk offset atom
if (!sc->chunk_offsets) {
av_log(s, AV_LOG_ERROR, "mov: no chunk offset atom, unable to seek\n");
return -1;
}
if (chunk > sc->chunk_count) {
av_log(s, AV_LOG_ERROR, "mov: chunk offset atom too short, unable to seek (req. chunk=%i, chunk count=%li)\n", chunk, sc->chunk_count);
return -1;
}
chunk_file_offset = sc->chunk_offsets[chunk - 1];
#ifdef DEBUG
av_log(s, AV_LOG_DEBUG, "Chunk file offset is #%llu \n", chunk_file_offset);
#endif
// Step 6. Find the byte offset within the chunk using the sample size atom
sample_file_offset = chunk_file_offset;
if (sc->sample_size)
sample_file_offset += (seek_sample - first_chunk_sample) * sc->sample_size;
else {
for (i = 0; i < (seek_sample - first_chunk_sample); i++) {
sample_file_offset += sc->sample_sizes[first_chunk_sample + i - 1];
}
}
#ifdef DEBUG
av_log(s, AV_LOG_DEBUG, "Sample file offset is #%llu \n", sample_file_offset);
#endif
// Step 6. Update the parser
mov->partial = sc;
mov->next_chunk_offset = sample_file_offset;
// Update current stream state
sc->current_sample = seek_sample - 1; // zero based
sc->left_in_chunk = left_in_chunk;
sc->next_chunk = chunk; // +1 -1 (zero based)
sc->sample_to_chunk_index = sample_to_chunk_idx;
// Update other streams
for (i = 0; i<mov->total_streams; i++) {
MOVStreamContext *msc;
if (i == mov_idx) continue;
// Find the nearest 'next' chunk
msc = mov->streams[i];
a = 0;
b = msc->chunk_count - 1;
while (a < b) {
m = (a + b + 1) >> 1;
if (msc->chunk_offsets[m] > chunk_file_offset) {
b = m - 1;
} else {
a = m;
}
#ifdef DEBUG
/* av_log(s, AV_LOG_DEBUG, "a=%i (%li) b=%i (%li) m=%i (%li) stream #%i\n"
, a, (long)msc->chunk_offsets[a], b, (long)msc->chunk_offsets[b], m, (long)msc->chunk_offsets[m], i); */
#endif
}
msc->next_chunk = a;
if (msc->chunk_offsets[a] < chunk_file_offset && a < (msc->chunk_count-1))
msc->next_chunk ++;
#ifdef DEBUG
av_log(s, AV_LOG_DEBUG, "Nearest next chunk for stream #%i is #%i @%lli\n", i, msc->next_chunk+1, msc->chunk_offsets[msc->next_chunk]);
#endif
// Compute sample count and index in the sample_to_chunk table (what a pity)
msc->sample_to_chunk_index = 0;
msc->current_sample = 0;
for(; msc->sample_to_chunk_index < (msc->sample_to_chunk_sz - 1)
&& msc->sample_to_chunk[msc->sample_to_chunk_index + 1].first <= (1 + msc->next_chunk); msc->sample_to_chunk_index++) {
msc->current_sample += (msc->sample_to_chunk[msc->sample_to_chunk_index + 1].first - msc->sample_to_chunk[msc->sample_to_chunk_index].first) \
* msc->sample_to_chunk[msc->sample_to_chunk_index].count;
}
msc->current_sample += (msc->next_chunk - (msc->sample_to_chunk[msc->sample_to_chunk_index].first - 1)) * sc->sample_to_chunk[msc->sample_to_chunk_index].count;
msc->left_in_chunk = msc->sample_to_chunk[msc->sample_to_chunk_index].count - 1;
#ifdef DEBUG
av_log(s, AV_LOG_DEBUG, "Next Sample for stream #%i is #%i @%i\n", i, msc->current_sample + 1, msc->sample_to_chunk_index + 1);
#endif
}
return 0;
}
#endif
static int mov_read_close(AVFormatContext *s)
{
int i;
MOVContext *mov = (MOVContext *) s->priv_data;
for(i=0; i<mov->total_streams; i++)
mov_free_stream_context(mov->streams[i]);
/* free color tabs */
for(i=0; i<mov->ctab_size; i++)
av_freep(&mov->ctab[i]);
av_freep(&mov->ctab);
return 0;
}
static AVInputFormat mov_iformat = {
"mov,mp4,m4a,3gp",
"QuickTime/MPEG4 format",
sizeof(MOVContext),
mov_probe,
mov_read_header,
mov_read_packet,
mov_read_close,
#if defined(MOV_SPLIT_CHUNKS) && defined(MOV_SEEK)
mov_read_seek,
#endif
};
int mov_init(void)
{
av_register_input_format(&mov_iformat);
return 0;
}
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