mov.c

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.7平台上编译为嵌入式图形界面操作系统。

/*
 * 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 "avformat.h"
#include "avi.h"

#ifdef CONFIG_ZLIB
#include <zlib.h>
#endif

/*
 * First version by Francois Revol [e-mail]
 * 
 * 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 :-)
 * 
 * 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/techpubs/quicktime/qtdevdocs/QTFF/qtff.html
 *  http://developer.apple.com/techpubs/quicktime/qtdevdocs/PDF/QTFileFormat.pdf
 * QuickTime is a trademark of Apple (AFAIK :))
 */

//#define DEBUG

/* allows chunk splitting - should work now... */
/* in case you can't read a file, try commenting */
#define MOV_SPLIT_CHUNKS

#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, UINT32 type, UINT64 offset, UINT64 size)
{
    unsigned int tag, i;
    tag = (unsigned int) type;
    i=debug_indent;
    if(tag == 0) tag = MKTAG('N', 'U', 'L', 'L');
    while(i--)
        printf("|");
    printf("parse:");
    printf(" %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)offset,
           (unsigned int)size);
}
#endif

/* 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 2

static const CodecTag mov_video_tags[] = {
/*  { CODEC_ID_, MKTAG('c', 'v', 'i', 'd') }, *//* Cinepak */
/*  { CODEC_ID_JPEG, MKTAG('j', 'p', 'e', 'g') }, *//* JPEG */
/*  { CODEC_ID_H263, MKTAG('r', 'a', 'w', ' ') }, *//* Uncompressed RGB */
/*  { CODEC_ID_H263, MKTAG('Y', 'u', 'v', '2') }, *//* Uncompressed YUV422 */
/* 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_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_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_, MKTAG('I', 'V', '5', '0') }, *//* Indeo 5.0 */
    { CODEC_ID_H263, MKTAG('h', '2', '6', '3') }, /* H263 */
    { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', ' ') }, /* DV NTSC */
    { CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', 'p') }, /* DV PAL */
    { 0, 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, 0x20776172 }, /* 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_AAC, MKTAG('m', 'p', '4', 'a') }, *//* MPEG 4 AAC or audio ? */
                                                     /* The standard for mpeg4 audio is still not normalised AFAIK anyway */
    { 0, 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 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 *chunk_offsets;
    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 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;
} 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;
    long time_scale;
    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 mdat_size;
    INT64 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 next_chunk_offset;
    int partial; /* != 0 : there is still to read in the current chunk (=id of the stream + 1) */
} MOVContext;


struct MOVParseTableEntry;

/* 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)(const struct MOVParseTableEntry *parse_table,
                                  ByteIOContext *pb,
                                  UINT32 atom_type,
                                  INT64 atom_offset, /* after the size and type field (and eventually the extended size) */
                                  INT64 atom_size, /* total size (excluding the size and type fields) */
                                  void *param);

/* links atom IDs to parse functions */
typedef struct MOVParseTableEntry {
    UINT32 type;
    mov_parse_function func;
} MOVParseTableEntry;

static int parse_leaf(const MOVParseTableEntry *parse_table, ByteIOContext *pb, UINT32 atom_type, INT64 atom_offset, INT64 atom_size, void *param)
{
#ifdef DEBUG
    print_atom("leaf", atom_type, atom_offset, atom_size);
#endif
    if(atom_size>1)
        url_fskip(pb, atom_size);
/*        url_seek(pb, atom_offset+atom_size, SEEK_SET); */
    return 0;
}


static int parse_default(const MOVParseTableEntry *parse_table, ByteIOContext *pb, UINT32 atom_type, INT64 atom_offset, INT64 atom_size, void *param)
{
    UINT32 type, foo=0;
    UINT64 offset, size;
    UINT64 total_size = 0;
    int i;
    int err = 0;
    foo=0;
#ifdef DEBUG
    print_atom("default", atom_type, atom_offset, atom_size);
    debug_indent++;
#endif
    
    offset = atom_offset;

    if(atom_size < 0)
        atom_size = 0x0FFFFFFFFFFFFFFF;
    while((total_size < atom_size) && !url_feof(pb) && !err) {
        size=atom_size;
        type=0L;
        if(atom_size >= 8) {
            size = get_be32(pb);
            type = get_le32(pb);
        }
        total_size += 8;
        offset+=8;
//        printf("type: %08lx  sz: %08lx", type, size);
        if(size == 1) { /* 64 bit extended size */
            size = get_be64(pb);
            offset+=8;
            total_size+=8;
            size-=8;
        }
        if(size == 0)
            size = atom_size - total_size;
        size-=8;
        for(i=0; parse_table[i].type != 0L && parse_table[i].type != type; i++);
        
//        printf(" i=%ld\n", i);
	if (parse_table[i].type == 0) { /* skip leaf atoms data */
//            url_seek(pb, atom_offset+atom_size, SEEK_SET);
#ifdef DEBUG
            print_atom("unknown", type, offset, size);
#endif
            url_fskip(pb, size);
        } else
            err = (parse_table[i].func)(parse_table, pb, type, offset, size, param);

        offset+=size;
        total_size+=size;
    }

#ifdef DEBUG
    debug_indent--;
#endif
    return err;
}

static int parse_mvhd(const MOVParseTableEntry *parse_table, ByteIOContext *pb, UINT32 atom_type, INT64 atom_offset, INT64 atom_size, void *param)
{
    MOVContext *c;
#ifdef DEBUG
    print_atom("mvhd", atom_type, atom_offset, atom_size);
#endif
    c = (MOVContext *)param;

    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
    printf("time scale = %li\n", c->time_scale);
#endif
    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;
}

/* this atom should contain all header atoms */
static int parse_moov(const MOVParseTableEntry *parse_table, ByteIOContext *pb, UINT32 atom_type, INT64 atom_offset, INT64 atom_size, void *param)
{
    int err;
    MOVContext *c;
#ifdef DEBUG
    print_atom("moov", atom_type, atom_offset, atom_size);
#endif
    c = (MOVContext *)param;

    err = parse_default(parse_table, pb, atom_type, atom_offset, atom_size, param);
    /* 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 */
}

/* this atom contains actual media data */
static int parse_mdat(const MOVParseTableEntry *parse_table, ByteIOContext *pb, UINT32 atom_type, INT64 atom_offset, INT64 atom_size, void *param)
{
    MOVContext *c;
#ifdef DEBUG
    print_atom("mdat", atom_type, atom_offset, atom_size);
#endif
    c = (MOVContext *)param;

    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 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 parse_wide(const MOVParseTableEntry *parse_table, ByteIOContext *pb, UINT32 atom_type, INT64 atom_offset, INT64 atom_size, void *param)
{
    int err;
    UINT32 type;
#ifdef DEBUG
    print_atom("wide", atom_type, atom_offset, atom_size);
    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;
    }
    type = get_le32(pb);
    if (type != MKTAG('m', 'd', 'a', 't')) {
        url_fskip(pb, atom_size - 8);
        return 0;
    }
    err = parse_mdat(parse_table, pb, type, atom_offset + 8, atom_size - 8, param);
#ifdef DEBUG
    debug_indent--;
#endif
    return err;
}

static int parse_trak(const MOVParseTableEntry *parse_table, ByteIOContext *pb, UINT32 atom_type, INT64 atom_offset, INT64 atom_size, void *param)
{
    MOVContext *c;
    AVStream *st;
    MOVStreamContext *sc;
#ifdef DEBUG
    print_atom("trak", atom_type, atom_offset, atom_size);
#endif

    c = (MOVContext *)param;
    st = av_new_stream(c->fc, c->fc->nb_streams);
    if (!st) return -2;
    sc = av_malloc(sizeof(MOVStreamContext));
    sc->sample_to_chunk_index = -1;
    st->priv_data = sc;
    st->codec.codec_type = CODEC_TYPE_MOV_OTHER;
    c->streams[c->fc->nb_streams-1] = sc;
    return parse_default(parse_table, pb, atom_type, atom_offset, atom_size, param);
}

static int parse_tkhd(const MOVParseTableEntry *parse_table, ByteIOContext *pb, UINT32 atom_type, INT64 atom_offset, INT64 atom_size, void *param)
{
    MOVContext *c;
    AVStream *st;
#ifdef DEBUG
    print_atom("tkhd", atom_type, atom_offset, atom_size);
#endif

    c = (MOVContext *)param;
    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 */
    get_be32(pb); /* 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;
}

static int parse_mdhd(const MOVParseTableEntry *parse_table, ByteIOContext *pb, UINT32 atom_type, INT64 atom_offset, INT64 atom_size, void *param)
{