isom.h

Go to the documentation of this file.

/*
 * ISO Media common code
 * copyright (c) 2001 Fabrice Bellard
 * copyright (c) 2002 Francois Revol <revol@free.fr>
 * copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@free.fr>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
 
#ifndef AVFORMAT_ISOM_H
#define AVFORMAT_ISOM_H
 
#include <stddef.h>
#include <stdint.h>
 
#include "libavutil/encryption_info.h"
#include "libavutil/mastering_display_metadata.h"
#include "libavutil/spherical.h"
#include "libavutil/stereo3d.h"
 
#include "avio.h"
#include "internal.h"
#include "dv.h"
 
/* isom.c */
extern const AVCodecTag ff_mp4_obj_type[];
extern const AVCodecTag ff_codec_movvideo_tags[];
extern const AVCodecTag ff_codec_movaudio_tags[];
extern const AVCodecTag ff_codec_movsubtitle_tags[];
extern const AVCodecTag ff_codec_movdata_tags[];
 
int ff_mov_iso639_to_lang(const char lang[4], int mp4);
int ff_mov_lang_to_iso639(unsigned code, char to[4]);
 
struct AVAESCTR;
 
/* 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 MOVStts {
    unsigned int count;
    int duration;
} MOVStts;
 
typedef struct MOVStsc {
    int first;
    int count;
    int id;
} MOVStsc;
 
typedef struct MOVElst {
    int64_t duration;
    int64_t time;
    float rate;
} MOVElst;
 
typedef struct MOVDref {
    uint32_t type;
    char *path;
    char *dir;
    char volume[28];
    char filename[64];
    int16_t nlvl_to, nlvl_from;
} MOVDref;
 
typedef struct MOVAtom {
    uint32_t type;
    int64_t size; /* total size (excluding the size and type fields) */
} MOVAtom;
 
struct MOVParseTableEntry;
 
typedef struct MOVFragment {
    int found_tfhd;
    unsigned track_id;
    uint64_t base_data_offset;
    uint64_t moof_offset;
    uint64_t implicit_offset;
    unsigned stsd_id;
    unsigned duration;
    unsigned size;
    unsigned flags;
} MOVFragment;
 
typedef struct MOVTrackExt {
    unsigned track_id;
    unsigned stsd_id;
    unsigned duration;
    unsigned size;
    unsigned flags;
} MOVTrackExt;
 
typedef struct MOVSbgp {
    unsigned int count;
    unsigned int index;
} MOVSbgp;
 
typedef struct MOVEncryptionIndex {
    // Individual encrypted samples.  If there are no elements, then the default
    // settings will be used.
    unsigned int nb_encrypted_samples;
    AVEncryptionInfo **encrypted_samples;
 
    uint8_t* auxiliary_info_sizes;
    size_t auxiliary_info_sample_count;
    uint8_t auxiliary_info_default_size;
    uint64_t* auxiliary_offsets;  ///< Absolute seek position
    size_t auxiliary_offsets_count;
} MOVEncryptionIndex;
 
typedef struct MOVFragmentStreamInfo {
    int id;
    int64_t sidx_pts;
    int64_t first_tfra_pts;
    int64_t tfdt_dts;
    int64_t next_trun_dts;
    int index_entry;
    MOVEncryptionIndex *encryption_index;
} MOVFragmentStreamInfo;
 
typedef struct MOVFragmentIndexItem {
    int64_t moof_offset;
    int headers_read;
    int current;
    int nb_stream_info;
    MOVFragmentStreamInfo * stream_info;
} MOVFragmentIndexItem;
 
typedef struct MOVFragmentIndex {
    int allocated_size;
    int complete;
    int current;
    int nb_items;
    MOVFragmentIndexItem * item;
} MOVFragmentIndex;
 
typedef struct MOVIndexRange {
    int64_t start;
    int64_t end;
} MOVIndexRange;
 
typedef struct MOVStreamContext {
    AVIOContext *pb;
    int pb_is_copied;
    int ffindex;          ///< AVStream index
    int next_chunk;
    unsigned int chunk_count;
    int64_t *chunk_offsets;
    unsigned int stts_count;
    MOVStts *stts_data;
    unsigned int sdtp_count;
    uint8_t *sdtp_data;
    unsigned int ctts_count;
    unsigned int ctts_allocated_size;
    MOVStts *ctts_data;
    unsigned int stsc_count;
    MOVStsc *stsc_data;
    unsigned int stsc_index;
    int stsc_sample;
    unsigned int stps_count;
    unsigned *stps_data;  ///< partial sync sample for mpeg-2 open gop
    MOVElst *elst_data;
    unsigned int elst_count;
    int ctts_index;
    int ctts_sample;
    unsigned int sample_size; ///< may contain value calculated from stsd or value from stsz atom
    unsigned int stsz_sample_size; ///< always contains sample size from stsz atom
    unsigned int sample_count;
    int *sample_sizes;
    int keyframe_absent;
    unsigned int keyframe_count;
    int *keyframes;
    int time_scale;
    int64_t time_offset;  ///< time offset of the edit list entries
    int64_t min_corrected_pts;  ///< minimum Composition time shown by the edits excluding empty edits.
    int current_sample;
    int64_t current_index;
    MOVIndexRange* index_ranges;
    MOVIndexRange* current_index_range;
    unsigned int bytes_per_frame;
    unsigned int samples_per_frame;
    int dv_audio_container;
    int pseudo_stream_id; ///< -1 means demux all ids
    int16_t audio_cid;    ///< stsd audio compression id
    unsigned drefs_count;
    MOVDref *drefs;
    int dref_id;
    int timecode_track;
    int width;            ///< tkhd width
    int height;           ///< tkhd height
    int dts_shift;        ///< dts shift when ctts is negative
    uint32_t palette[256];
    int has_palette;
    int64_t data_size;
    uint32_t tmcd_flags;  ///< tmcd track flags
    int64_t track_end;    ///< used for dts generation in fragmented movie files
    int start_pad;        ///< amount of samples to skip due to enc-dec delay
    unsigned int rap_group_count;
    MOVSbgp *rap_group;
 
    int nb_frames_for_fps;
    int64_t duration_for_fps;
 
    /** extradata array (and size) for multiple stsd */
    uint8_t **extradata;
    int *extradata_size;
    int last_stsd_index;
    int stsd_count;
    int stsd_version;
 
    int32_t *display_matrix;
    AVStereo3D *stereo3d;
    AVSphericalMapping *spherical;
    size_t spherical_size;
    AVMasteringDisplayMetadata *mastering;
    AVContentLightMetadata *coll;
    size_t coll_size;
 
    uint32_t format;
 
    int has_sidx;  // If there is an sidx entry for this stream.
    struct {
        struct AVAESCTR* aes_ctr;
        unsigned int per_sample_iv_size;  // Either 0, 8, or 16.
        AVEncryptionInfo *default_encrypted_sample;
        MOVEncryptionIndex *encryption_index;
    } cenc;
} MOVStreamContext;
 
typedef struct MOVContext {
    const AVClass *class; ///< class for private options
    AVFormatContext *fc;
    int time_scale;
    int64_t duration;     ///< duration of the longest track
    int found_moov;       ///< 'moov' atom has been found
    int found_mdat;       ///< 'mdat' atom has been found
    int found_hdlr_mdta;  ///< 'hdlr' atom with type 'mdta' has been found
    int trak_index;       ///< Index of the current 'trak'
    char **meta_keys;
    unsigned meta_keys_count;
    DVDemuxContext *dv_demux;
    AVFormatContext *dv_fctx;
    int isom;             ///< 1 if file is ISO Media (mp4/3gp)
    MOVFragment fragment; ///< current fragment in moof atom
    MOVTrackExt *trex_data;
    unsigned trex_count;
    int itunes_metadata;  ///< metadata are itunes style
    int handbrake_version;
    int *chapter_tracks;
    unsigned int nb_chapter_tracks;
    int use_absolute_path;
    int ignore_editlist;
    int advanced_editlist;
    int ignore_chapters;
    int seek_individually;
    int64_t next_root_atom; ///< offset of the next root atom
    int export_all;
    int export_xmp;
    int *bitrates;          ///< bitrates read before streams creation
    int bitrates_count;
    int moov_retry;
    int use_mfra_for;
    int has_looked_for_mfra;
    int use_tfdt;
    MOVFragmentIndex frag_index;
    int atom_depth;
    unsigned int aax_mode;  ///< 'aax' file has been detected
    uint8_t file_key[20];
    uint8_t file_iv[20];
    void *activation_bytes;
    int activation_bytes_size;
    void *audible_fixed_key;
    int audible_fixed_key_size;
    void *audible_key;
    int audible_key_size;
    void *audible_iv;
    int audible_iv_size;
    struct AVAES *aes_decrypt;
    uint8_t *decryption_key;
    int decryption_key_len;
    int enable_drefs;
    int32_t movie_display_matrix[3][3]; ///< display matrix from mvhd
    int have_read_mfra_size;
    uint32_t mfra_size;
} MOVContext;
 
int ff_mp4_read_descr_len(AVIOContext *pb);
int ff_mp4_read_descr(AVFormatContext *fc, AVIOContext *pb, int *tag);
int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext *pb);
void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id);
 
#define MP4ODescrTag                    0x01
#define MP4IODescrTag                   0x02
#define MP4ESDescrTag                   0x03
#define MP4DecConfigDescrTag            0x04
#define MP4DecSpecificDescrTag          0x05
#define MP4SLDescrTag                   0x06
 
#define MOV_TFHD_BASE_DATA_OFFSET       0x01
#define MOV_TFHD_STSD_ID                0x02
#define MOV_TFHD_DEFAULT_DURATION       0x08
#define MOV_TFHD_DEFAULT_SIZE           0x10
#define MOV_TFHD_DEFAULT_FLAGS          0x20
#define MOV_TFHD_DURATION_IS_EMPTY  0x010000
#define MOV_TFHD_DEFAULT_BASE_IS_MOOF 0x020000
 
#define MOV_TRUN_DATA_OFFSET            0x01
#define MOV_TRUN_FIRST_SAMPLE_FLAGS     0x04
#define MOV_TRUN_SAMPLE_DURATION       0x100
#define MOV_TRUN_SAMPLE_SIZE           0x200
#define MOV_TRUN_SAMPLE_FLAGS          0x400
#define MOV_TRUN_SAMPLE_CTS            0x800
 
#define MOV_FRAG_SAMPLE_FLAG_DEGRADATION_PRIORITY_MASK 0x0000ffff
#define MOV_FRAG_SAMPLE_FLAG_IS_NON_SYNC               0x00010000
#define MOV_FRAG_SAMPLE_FLAG_PADDING_MASK              0x000e0000
#define MOV_FRAG_SAMPLE_FLAG_REDUNDANCY_MASK           0x00300000
#define MOV_FRAG_SAMPLE_FLAG_DEPENDED_MASK             0x00c00000
#define MOV_FRAG_SAMPLE_FLAG_DEPENDS_MASK              0x03000000
 
#define MOV_FRAG_SAMPLE_FLAG_DEPENDS_NO                0x02000000
#define MOV_FRAG_SAMPLE_FLAG_DEPENDS_YES               0x01000000
 
#define MOV_TKHD_FLAG_ENABLED       0x0001
#define MOV_TKHD_FLAG_IN_MOVIE      0x0002
#define MOV_TKHD_FLAG_IN_PREVIEW    0x0004
#define MOV_TKHD_FLAG_IN_POSTER     0x0008
 
#define MOV_SAMPLE_DEPENDENCY_UNKNOWN 0x0
#define MOV_SAMPLE_DEPENDENCY_YES     0x1
#define MOV_SAMPLE_DEPENDENCY_NO      0x2
 
 
#define TAG_IS_AVCI(tag)                    \
    ((tag) == MKTAG('a', 'i', '5', 'p') ||  \
     (tag) == MKTAG('a', 'i', '5', 'q') ||  \
     (tag) == MKTAG('a', 'i', '5', '2') ||  \
     (tag) == MKTAG('a', 'i', '5', '3') ||  \
     (tag) == MKTAG('a', 'i', '5', '5') ||  \
     (tag) == MKTAG('a', 'i', '5', '6') ||  \
     (tag) == MKTAG('a', 'i', '1', 'p') ||  \
     (tag) == MKTAG('a', 'i', '1', 'q') ||  \
     (tag) == MKTAG('a', 'i', '1', '2') ||  \
     (tag) == MKTAG('a', 'i', '1', '3') ||  \
     (tag) == MKTAG('a', 'i', '1', '5') ||  \
     (tag) == MKTAG('a', 'i', '1', '6') ||  \
     (tag) == MKTAG('a', 'i', 'v', 'x') ||  \
     (tag) == MKTAG('A', 'V', 'i', 'n'))
 
 
int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb);
 
int ff_mov_read_stsd_entries(MOVContext *c, AVIOContext *pb, int entries);
void ff_mov_write_chan(AVIOContext *pb, int64_t channel_layout);
 
#define FF_MOV_FLAG_MFRA_AUTO -1
#define FF_MOV_FLAG_MFRA_DTS 1
#define FF_MOV_FLAG_MFRA_PTS 2
 
/**
 * Compute codec id for 'lpcm' tag.
 * See CoreAudioTypes and AudioStreamBasicDescription at Apple.
 */
static inline enum AVCodecID ff_mov_get_lpcm_codec_id(int bps, int flags)
{
    /* lpcm flags:
     * 0x1 = float
     * 0x2 = big-endian
     * 0x4 = signed
     */
    return ff_get_pcm_codec_id(bps, flags & 1, flags & 2, flags & 4 ? -1 : 0);
}
 
#define MOV_ISMV_TTML_TAG MKTAG('d', 'f', 'x', 'p')
#define MOV_MP4_TTML_TAG  MKTAG('s', 't', 'p', 'p')
 
#endif /* AVFORMAT_ISOM_H */