ref: e9b4be45b8eb828ddd32a5a1c0b1e1f7f921c624
dir: /common/mp4ff/mp4ff.c/
#include "mp4ff.h"
#if 0
int mp4ff_make_streamable(mp4_callback_t *in_path, mp4_callback_t *out_path)
{
mp4ff_t file, *old_file, new_file;
int moov_exists = 0, mdat_exists = 0, result, atoms = 1;
long mdat_start, mdat_size;
mp4ff_atom_t leaf_atom;
long moov_length;
mp4ff_init(&file);
/* find the moov atom in the old file */
if(!(file.stream = FOPEN(in_path, _T("rb"))))
{
//perror("mp4ff_make_streamable");
return 1;
}
file.total_length = file.stream->get_length();
/* get the locations of moov and mdat atoms */
do
{
/*printf("%x\n", mp4ff_position(&file)); */
result = mp4ff_atom_read_header(&file, &leaf_atom);
if(!result)
{
if(mp4ff_atom_is(&leaf_atom, "moov"))
{
moov_exists = atoms;
moov_length = leaf_atom.size;
}
else
if(mp4ff_atom_is(&leaf_atom, "mdat"))
{
mdat_start = mp4ff_position(&file) - HEADER_LENGTH;
mdat_size = leaf_atom.size;
mdat_exists = atoms;
}
mp4ff_atom_skip(&file, &leaf_atom);
atoms++;
}
}while(!result && mp4ff_position(&file) < file.total_length);
if(!moov_exists)
{
printf("mp4ff_make_streamable: no moov atom\n");
return 1;
}
if(!mdat_exists)
{
printf("mp4ff_make_streamable: no mdat atom\n");
return 1;
}
/* copy the old file to the new file */
if(moov_exists && mdat_exists)
{
/* moov wasn't the first atom */
if(moov_exists > 1)
{
char *buffer;
long buf_size = 1000000;
result = 0;
/* read the header proper */
if(!(old_file = mp4ff_open(in_path, 1, 0, 0)))
{
return 1;
}
mp4ff_shift_offsets(&(old_file->moov), moov_length);
/* open the output file */
if(!(new_file.stream = FOPEN(out_path, _T("wb"))))
{
//perror("mp4ff_make_streamable");
result = 1;
}
else
{
/* set up some flags */
new_file.wr = 1;
new_file.rd = 0;
mp4ff_write_moov(&new_file, &(old_file->moov));
mp4ff_set_position(old_file, mdat_start);
if(!(buffer = calloc(1, buf_size)))
{
result = 1;
printf("mp4ff_make_streamable: out of memory\n");
}
else
{
while(mp4ff_position(old_file) < mdat_start + mdat_size && !result)
{
if(mp4ff_position(old_file) + buf_size > mdat_start + mdat_size)
buf_size = mdat_start + mdat_size - mp4ff_position(old_file);
if(!mp4ff_read_data(old_file, buffer, buf_size)) result = 1;
if(!result)
{
if(!mp4ff_write_data(&new_file, buffer, buf_size)) result = 1;
}
}
free(buffer);
}
fclose(new_file.stream);
}
mp4ff_close(old_file);
}
else
{
printf("mp4ff_make_streamable: header already at 0 offset\n");
return 0;
}
}
return 0;
}
#endif
int mp4ff_set_time_scale(mp4ff_t *file, int time_scale)
{
file->moov.mvhd.time_scale = time_scale;
}
int mp4ff_set_copyright(mp4ff_t *file, char *string)
{
mp4ff_set_udta_string(&(file->moov.udta.copyright), &(file->moov.udta.copyright_len), string);
}
int mp4ff_set_name(mp4ff_t *file, char *string)
{
mp4ff_set_udta_string(&(file->moov.udta.name), &(file->moov.udta.name_len), string);
}
int mp4ff_set_info(mp4ff_t *file, char *string)
{
mp4ff_set_udta_string(&(file->moov.udta.info), &(file->moov.udta.info_len), string);
}
int mp4ff_get_time_scale(mp4ff_t *file)
{
return file->moov.mvhd.time_scale;
}
char* mp4ff_get_copyright(mp4ff_t *file)
{
return file->moov.udta.copyright;
}
char* mp4ff_get_name(mp4ff_t *file)
{
return file->moov.udta.name;
}
char* mp4ff_get_info(mp4ff_t *file)
{
return file->moov.udta.info;
}
int mp4ff_get_iod_audio_profile_level(mp4ff_t *file)
{
return file->moov.iods.audioProfileId;
}
int mp4ff_set_iod_audio_profile_level(mp4ff_t *file, int id)
{
mp4ff_iods_set_audio_profile(&file->moov.iods, id);
}
int mp4ff_get_iod_video_profile_level(mp4ff_t *file)
{
return file->moov.iods.videoProfileId;
}
int mp4ff_set_iod_video_profile_level(mp4ff_t *file, int id)
{
mp4ff_iods_set_video_profile(&file->moov.iods, id);
}
int mp4ff_video_tracks(mp4ff_t *file)
{
int i, result = 0;
for(i = 0; i < file->moov.total_tracks; i++)
{
if(file->moov.trak[i]->mdia.minf.is_video) result++;
}
return result;
}
int mp4ff_audio_tracks(mp4ff_t *file)
{
int i, result = 0;
mp4ff_minf_t *minf;
for(i = 0; i < file->moov.total_tracks; i++)
{
minf = &(file->moov.trak[i]->mdia.minf);
if(minf->is_audio)
result++;
}
return result;
}
int mp4ff_set_audio(mp4ff_t *file,
int channels,
long sample_rate,
int bits,
int sample_size,
int time_scale,
int sample_duration,
char *compressor)
{
int i, j;
mp4ff_trak_t *trak;
/* delete any existing tracks */
for(i = 0; i < file->total_atracks; i++) {
mp4ff_delete_audio_map(&(file->atracks[i]));
mp4ff_delete_trak(&(file->moov), file->atracks[i].track);
}
free(file->atracks);
file->atracks = NULL;
file->total_atracks = 0;
if(channels) {
#if 0
/* Fake the bits parameter for some formats. */
if(mp4ff_match_32(compressor, mp4ff_ULAW) ||
mp4ff_match_32(compressor, mp4ff_IMA4)) bits = 16;
#endif
file->atracks = (mp4ff_audio_map_t*)
calloc(1, sizeof(mp4ff_audio_map_t));
trak = mp4ff_add_track(&(file->moov));
mp4ff_trak_init_audio(file, trak, channels, sample_rate, bits,
sample_size, time_scale, sample_duration, compressor);
mp4ff_init_audio_map(&(file->atracks[0]), trak);
file->atracks[file->total_atracks].track = trak;
file->atracks[file->total_atracks].channels = channels;
file->atracks[file->total_atracks].current_position = 0;
file->atracks[file->total_atracks].current_chunk = 1;
file->total_atracks++;
}
return 1; /* Return the number of tracks created */
}
int mp4ff_set_video(mp4ff_t *file,
int tracks,
int frame_w,
int frame_h,
float frame_rate,
int time_scale,
char *compressor)
{
int i, j;
mp4ff_trak_t *trak;
/* delete any existing tracks */
for(i = 0; i < file->total_vtracks; i++) {
mp4ff_delete_video_map(&(file->vtracks[i]));
mp4ff_delete_trak(&(file->moov), file->vtracks[i].track);
}
free(file->vtracks);
file->vtracks = NULL;
file->total_vtracks = 0;
if (tracks > 0) {
file->total_vtracks = tracks;
file->vtracks = (mp4ff_video_map_t*)calloc(1, sizeof(mp4ff_video_map_t) * file->total_vtracks);
for(i = 0; i < tracks; i++)
{
trak = mp4ff_add_track(&(file->moov));
mp4ff_trak_init_video(file, trak, frame_w, frame_h, frame_rate,
time_scale, compressor);
mp4ff_init_video_map(&(file->vtracks[i]), trak);
}
}
return 0;
}
int mp4ff_set_framerate(mp4ff_t *file, float framerate)
{
int i;
int new_time_scale, new_sample_duration;
new_time_scale = mp4ff_get_timescale(framerate);
new_sample_duration = (int)((float)new_time_scale / framerate + 0.5);
for(i = 0; i < file->total_vtracks; i++)
{
file->vtracks[i].track->mdia.mdhd.time_scale = new_time_scale;
file->vtracks[i].track->mdia.minf.stbl.stts.table[0].sample_duration = new_sample_duration;
}
}
mp4ff_trak_t* mp4ff_add_track(mp4ff_moov_t *moov)
{
mp4ff_trak_t *trak;
trak = moov->trak[moov->total_tracks] = calloc(1, sizeof(mp4ff_trak_t));
mp4ff_trak_init(trak);
trak->tkhd.track_id = moov->mvhd.next_track_id;
moov->mvhd.next_track_id++;
moov->total_tracks++;
return trak;
}
/* ============================= Initialization functions */
int mp4ff_init(mp4ff_t *file)
{
memset(file, 0, sizeof(mp4ff_t));
mp4ff_mdat_init(&(file->mdat));
mp4ff_moov_init(&(file->moov));
return 0;
}
int mp4ff_delete(mp4ff_t *file)
{
int i;
if(file->total_atracks)
{
for(i = 0; i < file->total_atracks; i++)
mp4ff_delete_audio_map(&(file->atracks[i]));
free(file->atracks);
}
if(file->total_vtracks)
{
for(i = 0; i < file->total_vtracks; i++)
mp4ff_delete_video_map(&(file->vtracks[i]));
free(file->vtracks);
}
file->total_atracks = 0;
file->total_vtracks = 0;
mp4ff_moov_delete(&(file->moov));
mp4ff_mdat_delete(&(file->mdat));
return 0;
}
/* =============================== Optimization functions */
int mp4ff_get_timescale(float frame_rate)
{
int timescale = 600;
/* Encode the 29.97, 23.976, 59.94 framerates as per DV freaks */
if(frame_rate - (int)frame_rate != 0) timescale = (int)(frame_rate * 1001 + 0.5);
else
if((600 / frame_rate) - (int)(600 / frame_rate) != 0) timescale = (int)(frame_rate * 100 + 0.5);
return timescale;
}
int mp4ff_seek_end(mp4ff_t *file)
{
mp4ff_set_position(file, file->mdat.size + file->mdat.start);
/*printf("mp4ff_seek_end %ld\n", file->mdat.size + file->mdat.start); */
mp4ff_update_positions(file);
return 0;
}
int mp4ff_seek_start(mp4ff_t *file)
{
mp4ff_set_position(file, file->mdat.start + HEADER_LENGTH);
mp4ff_update_positions(file);
return 0;
}
long mp4ff_audio_length(mp4ff_t *file, int track)
{
if(file->total_atracks > 0)
return mp4ff_track_samples(file, file->atracks[track].track);
return 0;
}
long mp4ff_video_length(mp4ff_t *file, int track)
{
/*printf("mp4ff_video_length %d %d\n", mp4ff_track_samples(file, file->vtracks[track].track), track); */
if(file->total_vtracks > 0)
return mp4ff_track_samples(file, file->vtracks[track].track);
return 0;
}
long mp4ff_audio_position(mp4ff_t *file, int track)
{
return file->atracks[track].current_position;
}
long mp4ff_video_position(mp4ff_t *file, int track)
{
return file->vtracks[track].current_position;
}
int mp4ff_update_positions(mp4ff_t *file)
{
/* Used for routines that change the positions of all tracks, like */
/* seek_end and seek_start but not for routines that reposition one track, like */
/* set_audio_position. */
long mdat_offset = mp4ff_position(file) - file->mdat.start;
long sample, chunk, chunk_offset;
int i;
if(file->total_atracks)
{
sample = mp4ff_offset_to_sample(file->atracks[0].track, mdat_offset);
chunk = mp4ff_offset_to_chunk(&chunk_offset, file->atracks[0].track, mdat_offset);
for(i = 0; i < file->total_atracks; i++)
{
file->atracks[i].current_position = sample;
file->atracks[i].current_chunk = chunk;
}
}
if(file->total_vtracks)
{
sample = mp4ff_offset_to_sample(file->vtracks[0].track, mdat_offset);
chunk = mp4ff_offset_to_chunk(&chunk_offset, file->vtracks[0].track, mdat_offset);
for(i = 0; i < file->total_vtracks; i++)
{
file->vtracks[i].current_position = sample;
file->vtracks[i].current_chunk = chunk;
}
}
return 0;
}
int mp4ff_set_audio_position(mp4ff_t *file, long sample, int track)
{
long offset, chunk_sample, chunk;
mp4ff_trak_t *trak;
if(file->total_atracks)
{
trak = file->atracks[track].track;
file->atracks[track].current_position = sample;
mp4ff_chunk_of_sample(&chunk_sample, &chunk, trak, sample);
file->atracks[track].current_chunk = chunk;
offset = mp4ff_sample_to_offset(trak, sample);
mp4ff_set_position(file, offset);
/*mp4ff_update_positions(file); */
}
return 0;
}
int mp4ff_set_video_position(mp4ff_t *file, long frame, int track)
{
long offset, chunk_sample, chunk;
mp4ff_trak_t *trak;
if(file->total_vtracks)
{
trak = file->vtracks[track].track;
file->vtracks[track].current_position = frame;
mp4ff_chunk_of_sample(&chunk_sample, &chunk, trak, frame);
file->vtracks[track].current_chunk = chunk;
offset = mp4ff_sample_to_offset(trak, frame);
mp4ff_set_position(file, offset);
/*mp4ff_update_positions(file); */
}
return 0;
}
int mp4ff_has_audio(mp4ff_t *file)
{
if(mp4ff_audio_tracks(file)) return 1;
return 0;
}
long mp4ff_audio_sample_rate(mp4ff_t *file, int track)
{
if(file->total_atracks)
return file->atracks[track].track->mdia.minf.stbl.stsd.table[0].sample_rate;
return 0;
}
int mp4ff_audio_bits(mp4ff_t *file, int track)
{
if(file->total_atracks)
return file->atracks[track].track->mdia.minf.stbl.stsd.table[0].sample_size;
return 0;
}
int mp4ff_audio_time_scale(mp4ff_t *file, int track)
{
if(file->total_atracks) {
return file->atracks[track].track->mdia.mdhd.time_scale;
}
return 0;
}
int mp4ff_audio_sample_duration(mp4ff_t *file, int track)
{
if(file->total_atracks) {
return file->atracks[track].track->mdia.minf.stbl.stts.table[0].sample_duration;
}
return 0;
}
char* mp4ff_audio_compressor(mp4ff_t *file, int track)
{
if (file->atracks[track].track == NULL)
return (NULL);
return file->atracks[track].track->mdia.minf.stbl.stsd.table[0].format;
}
int mp4ff_track_channels(mp4ff_t *file, int track)
{
if(track < file->total_atracks)
return file->atracks[track].channels;
return 0;
}
int mp4ff_channel_location(mp4ff_t *file, int *mp4ff_track, int *mp4ff_channel, int channel)
{
int current_channel = 0, current_track = 0;
*mp4ff_channel = 0;
*mp4ff_track = 0;
for(current_channel = 0, current_track = 0; current_track < file->total_atracks; )
{
if(channel >= current_channel)
{
*mp4ff_channel = channel - current_channel;
*mp4ff_track = current_track;
}
current_channel += file->atracks[current_track].channels;
current_track++;
}
return 0;
}
int mp4ff_has_video(mp4ff_t *file)
{
if(mp4ff_video_tracks(file)) return 1;
return 0;
}
int mp4ff_video_width(mp4ff_t *file, int track)
{
if(file->total_vtracks) {
int width =
file->vtracks[track].track->mdia.minf.stbl.stsd.table[0].width;
if (width) {
return width;
}
return file->vtracks[track].track->tkhd.track_width;
}
return 0;
}
int mp4ff_video_height(mp4ff_t *file, int track)
{
if(file->total_vtracks) {
int height = file->vtracks[track].track->mdia.minf.stbl.stsd.table[0].height;
if (height) {
return height;
}
return file->vtracks[track].track->tkhd.track_height;
}
return 0;
}
int mp4ff_video_depth(mp4ff_t *file, int track)
{
if(file->total_vtracks)
return file->vtracks[track].track->mdia.minf.stbl.stsd.table[0].depth;
return 0;
}
int mp4ff_set_depth(mp4ff_t *file, int depth, int track)
{
int i;
for(i = 0; i < file->total_vtracks; i++)
{
file->vtracks[i].track->mdia.minf.stbl.stsd.table[0].depth = depth;
}
}
float mp4ff_video_frame_rate(mp4ff_t *file, int track)
{
float ret = 0;
int num = 0;
if(file->total_vtracks) {
ret = file->vtracks[track].track->mdia.mdhd.time_scale;
if (file->vtracks[track].track->mdia.minf.stbl.stts.table[0].sample_duration == 0)
num = 1;
ret /=
file->vtracks[track].track->mdia.minf.stbl.stts.table[num].sample_duration;
}
return ret;
}
char* mp4ff_video_compressor(mp4ff_t *file, int track)
{
if (file->vtracks[track].track == NULL)
return (NULL);
return file->vtracks[track].track->mdia.minf.stbl.stsd.table[0].format;
}
int mp4ff_video_time_scale(mp4ff_t *file, int track)
{
if(file->total_vtracks) {
return file->vtracks[track].track->mdia.mdhd.time_scale;
}
return 0;
}
int mp4ff_video_frame_time(mp4ff_t *file, int track, long frame,
long *start, int *duration)
{
mp4ff_stts_t *stts;
int i;
long f;
if (file->total_vtracks == 0) {
return 0;
}
stts = &(file->vtracks[track].track->mdia.minf.stbl.stts);
if (frame < file->last_frame) {
/* we need to reset our cached values */
file->last_frame = 0;
file->last_start = 0;
file->last_stts_index = 0;
}
i = file->last_stts_index;
f = file->last_frame;
*start = file->last_start;
while (i < stts->total_entries) {
if (f + stts->table[i].sample_count <= frame) {
*start += stts->table[i].sample_duration
* stts->table[i].sample_count;
f += stts->table[i].sample_count;
i++;
} else {
/* cache the results for future use */
file->last_stts_index = i;
file->last_frame = f;
file->last_start = *start;
*start += stts->table[i].sample_duration * (frame - f);
*duration = stts->table[i].sample_duration;
return 1;
}
}
/* error */
return 0;
}
int mp4ff_get_mp4_video_decoder_config(mp4ff_t *file, int track, unsigned char** ppBuf, int* pBufSize)
{
mp4ff_esds_t* esds;
if (!file->total_vtracks) {
return 0;
}
esds = &file->vtracks[track].track->mdia.minf.stbl.stsd.table[0].esds;
return mp4ff_esds_get_decoder_config(esds, ppBuf, pBufSize);
}
int mp4ff_set_mp4_video_decoder_config(mp4ff_t *file, int track, unsigned char* pBuf, int bufSize)
{
mp4ff_esds_t* esds;
if (!file->total_vtracks) {
return 0;
}
esds = &file->vtracks[track].track->mdia.minf.stbl.stsd.table[0].esds;
return mp4ff_esds_set_decoder_config(esds, pBuf, bufSize);
}
int mp4ff_get_mp4_audio_decoder_config(mp4ff_t *file, int track, unsigned char** ppBuf, int* pBufSize)
{
mp4ff_esds_t* esds;
if (!file->total_atracks) {
return 0;
}
esds = &file->atracks[track].track->mdia.minf.stbl.stsd.table[0].esds;
return mp4ff_esds_get_decoder_config(esds, ppBuf, pBufSize);
}
int mp4ff_set_mp4_audio_decoder_config(mp4ff_t *file, int track, unsigned char* pBuf, int bufSize)
{
mp4ff_esds_t* esds;
if (!file->total_atracks) {
return 0;
}
esds = &file->atracks[track].track->mdia.minf.stbl.stsd.table[0].esds;
return mp4ff_esds_set_decoder_config(esds, pBuf, bufSize);
}
long mp4ff_samples_to_bytes(mp4ff_trak_t *track, long samples)
{
return samples
* track->mdia.minf.stbl.stsd.table[0].channels
* track->mdia.minf.stbl.stsd.table[0].sample_size / 8;
}
int mp4ff_write_audio(mp4ff_t *file, char *audio_buffer, long samples, int track)
{
long offset;
int result;
long bytes;
/* Defeat 32 bit file size limit. */
if(mp4ff_test_position(file)) return 1;
/* write chunk for 1 track */
bytes = samples * mp4ff_audio_bits(file, track) / 8 * file->atracks[track].channels;
offset = mp4ff_position(file);
result = mp4ff_write_data(file, audio_buffer, bytes);
if(result) result = 0; else result = 1; /* defeat fwrite's return */
mp4ff_update_tables(file,
file->atracks[track].track,
offset,
file->atracks[track].current_chunk,
file->atracks[track].current_position,
samples,
0,
0,
0,
0);
file->atracks[track].current_position += samples;
file->atracks[track].current_chunk++;
return result;
}
int mp4ff_write_audio_frame(mp4ff_t *file, unsigned char *audio_buffer, long bytes, int track)
{
long offset = mp4ff_position(file);
int result = 0;
/* Defeat 32 bit file size limit. */
if(mp4ff_test_position(file)) return 1;
result = mp4ff_write_data(file, audio_buffer, bytes);
if(result) result = 0; else result = 1;
mp4ff_update_tables(file,
file->atracks[track].track,
offset,
file->atracks[track].current_chunk,
file->atracks[track].current_position,
1,
bytes,
0,
0,
0);
file->atracks[track].current_position += 1;
file->atracks[track].current_chunk++;
return result;
}
int mp4ff_write_video_frame(mp4ff_t *file,
unsigned char *video_buffer,
long bytes,
int track,
unsigned char isKeyFrame,
long duration,
long renderingOffset)
{
long offset = mp4ff_position(file);
int result = 0;
/* Defeat 32 bit file size limit. */
if(mp4ff_test_position(file)) return 1;
result = mp4ff_write_data(file, video_buffer, bytes);
if(result) result = 0; else result = 1;
mp4ff_update_tables(file,
file->vtracks[track].track,
offset,
file->vtracks[track].current_chunk,
file->vtracks[track].current_position,
1,
bytes,
duration,
isKeyFrame,
renderingOffset);
file->vtracks[track].current_position += 1;
file->vtracks[track].current_chunk++;
return result;
}
mp4_callback_t* mp4ff_get_fd(mp4ff_t *file)
{
if (file->stream->get_position() != file->file_position)
file->stream->seek(file->file_position);
return file->stream;
}
int mp4ff_write_frame_init(mp4ff_t *file, int track)
{
if(file->stream->get_position() != file->file_position)
file->stream->seek(file->file_position);
file->offset = mp4ff_position(file);
return 0;
}
int mp4ff_write_frame_end(mp4ff_t *file, int track)
{
long bytes;
file->file_position = file->stream->get_position();
bytes = mp4ff_position(file) - file->offset;
mp4ff_update_tables(file,
file->vtracks[track].track,
file->offset,
file->vtracks[track].current_chunk,
file->vtracks[track].current_position,
1,
bytes,
0,
0,
0);
file->vtracks[track].current_position += 1;
file->vtracks[track].current_chunk++;
return 0;
}
int mp4ff_write_audio_init(mp4ff_t *file, int track)
{
return mp4ff_write_frame_init(file, track);
}
int mp4ff_write_audio_end(mp4ff_t *file, int track, long samples)
{
long bytes;
file->file_position = file->stream->get_position();
bytes = mp4ff_position(file) - file->offset;
mp4ff_update_tables(file,
file->atracks[track].track,
file->offset,
file->atracks[track].current_chunk,
file->atracks[track].current_position,
samples,
bytes,
0,
0,
0);
file->atracks[track].current_position += samples;
file->atracks[track].current_chunk++;
return 0;
}
long mp4ff_read_audio(mp4ff_t *file, char *audio_buffer, long samples, int track)
{
long chunk_sample, chunk;
int result = 1, track_num;
mp4ff_trak_t *trak = file->atracks[track].track;
long fragment_len, chunk_end;
long position = file->atracks[track].current_position;
long start = position, end = position + samples;
long bytes, total_bytes = 0;
long buffer_offset;
mp4ff_chunk_of_sample(&chunk_sample, &chunk, trak, position);
buffer_offset = 0;
while(position < end && result)
{
mp4ff_set_audio_position(file, position, track);
fragment_len = mp4ff_chunk_samples(trak, chunk);
chunk_end = chunk_sample + fragment_len;
fragment_len -= position - chunk_sample;
if(position + fragment_len > chunk_end) fragment_len = chunk_end - position;
if(position + fragment_len > end) fragment_len = end - position;
bytes = mp4ff_samples_to_bytes(trak, fragment_len);
result = mp4ff_read_data(file, &audio_buffer[buffer_offset], bytes);
total_bytes += bytes;
position += fragment_len;
chunk_sample = position;
buffer_offset += bytes;
chunk++;
}
file->atracks[track].current_position = position;
if(!result) return 0;
return total_bytes;
}
int mp4ff_read_chunk(mp4ff_t *file, char *output, int track, long chunk, long byte_start, long byte_len)
{
mp4ff_set_position(file, mp4ff_chunk_to_offset(file->atracks[track].track, chunk) + byte_start);
if(mp4ff_read_data(file, output, byte_len)) return 0;
else
return 1;
}
long mp4ff_frame_size(mp4ff_t *file, long frame, int track)
{
int bytes;
mp4ff_trak_t *trak = file->vtracks[track].track;
if(trak->mdia.minf.stbl.stsz.sample_size)
{
bytes = trak->mdia.minf.stbl.stsz.sample_size;
}
else
{
bytes = trak->mdia.minf.stbl.stsz.table[frame].size;
}
return bytes;
}
long mp4ff_get_sample_duration(mp4ff_t *file, long frame, int track)
{
int i, ci = 0, co = 0;
mp4ff_trak_t *trak = file->atracks[track].track;
for (i = 0; i < trak->mdia.minf.stbl.stts.total_entries; i++)
{
int j;
for (j = 0; j < trak->mdia.minf.stbl.stts.table[i].sample_count; j++)
{
if (co == frame)
return trak->mdia.minf.stbl.stts.table[ci].sample_duration;
co++;
}
ci++;
}
}
long mp4ff_audio_frame_size(mp4ff_t *file, long frame, int track)
{
int bytes;
mp4ff_trak_t *trak = file->atracks[track].track;
if(trak->mdia.minf.stbl.stsz.sample_size)
{
bytes = trak->mdia.minf.stbl.stsz.sample_size;
} else {
bytes = trak->mdia.minf.stbl.stsz.table[frame].size;
}
return bytes;
}
long mp4ff_read_audio_frame(mp4ff_t *file, unsigned char *audio_buffer, int maxBytes, int track)
{
long bytes;
int result = 0;
mp4ff_trak_t *trak = file->atracks[track].track;
bytes = mp4ff_audio_frame_size(file,
file->atracks[track].current_position, track);
if (bytes > maxBytes) {
return -bytes;
}
mp4ff_set_audio_position(file,
file->atracks[track].current_position, track);
result = mp4ff_read_data(file, audio_buffer, bytes);
file->atracks[track].current_position++;
if (!result)
return 0;
return bytes;
}
long mp4ff_read_frame(mp4ff_t *file, unsigned char *video_buffer, int track)
{
long bytes;
int result = 0;
mp4ff_trak_t *trak = file->vtracks[track].track;
bytes = mp4ff_frame_size(file, file->vtracks[track].current_position, track);
if(!file->vtracks[track].frames_cached)
{
mp4ff_set_video_position(file, file->vtracks[track].current_position, track);
result = mp4ff_read_data(file, video_buffer, bytes);
}
else
{
int i;
unsigned char *cached_frame;
if(file->vtracks[track].current_position >= file->vtracks[track].frames_cached) result = 1;
if(!result)
{
cached_frame = file->vtracks[track].frame_cache[file->vtracks[track].current_position];
for(i = 0; i < bytes; i++)
video_buffer[i] = cached_frame[i];
}
}
file->vtracks[track].current_position++;
if(!result) return 0;
return bytes;
}
int mp4ff_read_frame_init(mp4ff_t *file, int track)
{
mp4ff_trak_t *trak = file->vtracks[track].track;
mp4ff_set_video_position(file, file->vtracks[track].current_position, track);
if(file->stream->get_position() != file->file_position)
file->stream->seek(file->file_position);
return 0;
}
int mp4ff_read_frame_end(mp4ff_t *file, int track)
{
file->file_position = file->stream->get_position();
file->vtracks[track].current_position++;
return 0;
}
int mp4ff_init_video_map(mp4ff_video_map_t *vtrack, mp4ff_trak_t *trak)
{
vtrack->track = trak;
vtrack->current_position = 0;
vtrack->current_chunk = 1;
vtrack->frame_cache = 0;
vtrack->frames_cached = 0;
return 0;
}
int mp4ff_delete_video_map(mp4ff_video_map_t *vtrack)
{
int i;
if(vtrack->frames_cached)
{
for(i = 0; i < vtrack->frames_cached; i++)
{
free(vtrack->frame_cache[i]);
}
free(vtrack->frame_cache);
vtrack->frames_cached = 0;
}
return 0;
}
int mp4ff_init_audio_map(mp4ff_audio_map_t *atrack, mp4ff_trak_t *trak)
{
atrack->track = trak;
atrack->channels = trak->mdia.minf.stbl.stsd.table[0].channels;
atrack->current_position = 0;
atrack->current_chunk = 1;
return 0;
}
int mp4ff_delete_audio_map(mp4ff_audio_map_t *atrack)
{
int i;
return 0;
}
int mp4ff_read_info(mp4ff_t *file)
{
int result = 0, found_moov = 0;
int i, j, k, m, channel, trak_channel, track;
long start_position = mp4ff_position(file);
mp4ff_atom_t leaf_atom;
mp4ff_trak_t *trak;
mp4ff_set_position(file, 0);
do
{
result = mp4ff_atom_read_header(file, &leaf_atom);
if(!result)
{
if(mp4ff_atom_is(&leaf_atom, "mdat")) {
mp4ff_read_mdat(file, &(file->mdat), &leaf_atom);
} else if(mp4ff_atom_is(&leaf_atom, "moov")) {
mp4ff_read_moov(file, &(file->moov), &leaf_atom);
found_moov = 1;
} else {
mp4ff_atom_skip(file, &leaf_atom);
}
}
}while(!result && mp4ff_position(file) < file->total_length);
/* go back to the original position */
mp4ff_set_position(file, start_position);
if(found_moov) {
/* get tables for all the different tracks */
file->total_atracks = mp4ff_audio_tracks(file);
file->atracks = (mp4ff_audio_map_t*)calloc(1,
sizeof(mp4ff_audio_map_t) * file->total_atracks);
for(i = 0, track = 0; i < file->total_atracks; i++) {
while(!file->moov.trak[track]->mdia.minf.is_audio)
track++;
mp4ff_init_audio_map(&(file->atracks[i]), file->moov.trak[track]);
}
file->total_vtracks = mp4ff_video_tracks(file);
file->vtracks = (mp4ff_video_map_t*)calloc(1, sizeof(mp4ff_video_map_t) * file->total_vtracks);
for(track = 0, i = 0; i < file->total_vtracks; i++)
{
while(!file->moov.trak[track]->mdia.minf.is_video)
track++;
mp4ff_init_video_map(&(file->vtracks[i]), file->moov.trak[track]);
}
}
if(found_moov)
return 0;
else
return 1;
}
int mp4ff_dump(mp4ff_t *file)
{
printf("mp4ff_dump\n");
printf("movie data\n");
printf(" size %ld\n", file->mdat.size);
printf(" start %ld\n", file->mdat.start);
mp4ff_moov_dump(&(file->moov));
return 0;
}
/* ================================== Entry points ========================== */
int mp4ff_check_sig(mp4_callback_t *path)
{
mp4ff_t file;
mp4ff_atom_t leaf_atom;
int result1 = 0, result2 = 0;
mp4ff_init(&file);
file.stream = path;
file.total_length = file.stream->get_length();
do
{
result1 = mp4ff_atom_read_header(&file, &leaf_atom);
if(!result1)
{
/* just want the "moov" atom */
if(mp4ff_atom_is(&leaf_atom, "moov"))
{
result2 = 1;
}
else
mp4ff_atom_skip(&file, &leaf_atom);
}
}while(!result1 && !result2 && mp4ff_position(&file) < file.total_length);
mp4ff_delete(&file);
return result2;
}
mp4ff_t* mp4ff_open(mp4_callback_t *callbacks, int rd, int wr, int append)
{
mp4ff_t *new_file = malloc(sizeof(mp4ff_t));
int exists = 0;
mp4ff_init(new_file);
new_file->stream = callbacks;
new_file->wr = wr;
new_file->rd = rd;
new_file->mdat.start = 0;
if(rd /*&& exists*/)
{
new_file->total_length = new_file->stream->get_length();
if(mp4ff_read_info(new_file))
{
mp4ff_close(new_file);
new_file = 0;
}
}
if(wr)
{
if(!exists || !append)
{
/* start the data atom */
mp4ff_write_int32(new_file, 0);
mp4ff_write_char32(new_file, "mdat");
} else {
mp4ff_set_position(new_file,
new_file->mdat.start + new_file->mdat.size);
new_file->stream->seek(new_file->mdat.start + new_file->mdat.size);
}
}
return new_file;
}
int mp4ff_write(mp4ff_t *file)
{
int result = -1;
if(!file->wr) {
return result;
}
mp4ff_write_mdat(file, &(file->mdat));
mp4ff_write_moov(file, &(file->moov));
return result;
}
int mp4ff_destroy(mp4ff_t *file)
{
mp4ff_delete(file);
free(file);
return 0;
}
int mp4ff_close(mp4ff_t *file)
{
int result = 0;
if(file->wr)
{
mp4ff_write_mdat(file, &(file->mdat));
mp4ff_write_moov(file, &(file->moov));
}
mp4ff_delete(file);
free(file);
return result;
}