#include <regex.h>
#include "para.h"
+#include "error.h"
#include "portable_io.h"
#include "string.h"
#include "mp4.h"
struct mp4_track {
- bool is_audio;
uint16_t channelCount;
uint16_t sampleRate;
/* stts */
uint32_t stts_entry_count;
uint32_t *stts_sample_count;
- uint32_t *stts_sample_delta;
/* stsc */
uint32_t stsc_entry_count;
uint32_t *stsc_first_chunk;
uint32_t *stsc_samples_per_chunk;
- uint32_t *stsc_sample_desc_index;
/* stsc */
uint32_t stco_entry_count;
int32_t total_tracks;
/* track data */
struct mp4_track *track[MAX_TRACKS];
+ /* the first audio track found */
+ struct mp4_track *audio_track;
/* metadata */
struct mp4_metadata meta;
};
-int32_t mp4_total_tracks(const struct mp4 *f)
-{
- return f->total_tracks;
-}
-
/*
* Returns -1, 0, or 1 on errors/EOF/success. Partial reads followed by EOF or
* read errors are treated as errors.
return ret;
t->stts_sample_count = para_malloc(t->stts_entry_count
* sizeof(int32_t));
- t->stts_sample_delta = para_malloc(t->stts_entry_count
- * sizeof (int32_t));
for (i = 0; i < t->stts_entry_count; i++) {
ret = read_int32(f, &t->stts_sample_count[i]);
if (ret <= 0)
return ret;
- ret = read_int32(f, &t->stts_sample_delta[i]);
+ ret = read_int32(f, NULL); /* sample delta */
if (ret <= 0)
return ret;
}
t->stsc_first_chunk = para_malloc(t->stsc_entry_count * sizeof(int32_t));
t->stsc_samples_per_chunk = para_malloc(t->stsc_entry_count
* sizeof (int32_t));
- t->stsc_sample_desc_index = para_malloc(t->stsc_entry_count *
- sizeof (int32_t));
-
for (i = 0; i < t->stsc_entry_count; i++) {
ret = read_int32(f, &t->stsc_first_chunk[i]);
if (ret <= 0)
ret = read_int32(f, &t->stsc_samples_per_chunk[i]);
if (ret <= 0)
return ret;
- ret = read_int32(f, &t->stsc_sample_desc_index[i]);
+ ret = read_int32(f, NULL); /* sample desc index */
if (ret <= 0)
return ret;
}
if (ret <= 0)
return ret;
skip += size;
- t->is_audio = atom_type == ATOM_MP4A;
- if (t->is_audio)
+ if (!f->audio_track && atom_type == ATOM_MP4A) {
+ f->audio_track = t;
read_mp4a(f);
+ }
set_position(f, skip);
}
return 1;
return 1;
}
-/* parse root atoms */
-static int parse_atoms(struct mp4 *f, int meta_only)
+static int parse_root_atoms(struct mp4 *f, int meta_only)
{
int ret;
uint64_t size;
while ((ret = atom_read_header(f, &atom_type, &header_size, &size)) > 0) {
f->file_size += size;
f->last_atom = atom_type;
-
- if (atom_type == ATOM_MOOV && size > header_size) {
- f->moov_offset = get_position(f) - header_size;
- f->moov_size = size;
- }
-
- /* parse subatoms */
- if (meta_only && !need_parse_when_meta_only(atom_type)) {
- set_position(f, get_position(f) + size - header_size);
- } else if (atom_type < SUBATOMIC) {
- ret = parse_sub_atoms(f, size - header_size, meta_only);
- if (ret <= 0)
- return ret;
- } else {
- /* skip this atom */
+ if (atom_type != ATOM_MOOV || size <= header_size) { /* skip */
set_position(f, get_position(f) + size - header_size);
+ continue;
}
+ f->moov_offset = get_position(f) - header_size;
+ f->moov_size = size;
+ ret = parse_sub_atoms(f, size - header_size, meta_only);
+ if (ret <= 0)
+ break;
}
+ if (ret < 0)
+ return ret;
+ if (!f->audio_track)
+ return -E_MP4_TRACK;
return ret;
}
struct mp4 *f = para_calloc(sizeof(struct mp4));
f->cb = cb;
- ret = parse_atoms(f, 0);
+ ret = parse_root_atoms(f, 0);
if (ret < 0) {
free(f);
return NULL;
if (f->track[i]) {
free(f->track[i]->stsz_table);
free(f->track[i]->stts_sample_count);
- free(f->track[i]->stts_sample_delta);
free(f->track[i]->stsc_first_chunk);
free(f->track[i]->stsc_samples_per_chunk);
- free(f->track[i]->stsc_sample_desc_index);
free(f->track[i]->stco_chunk_offset);
free(f->track[i]);
}
free(f);
}
-static int32_t chunk_of_sample(const struct mp4 *f, int32_t track,
- int32_t sample, int32_t *chunk_sample, int32_t *chunk)
+static int32_t chunk_of_sample(const struct mp4 *f, int32_t sample,
+ int32_t *chunk)
{
- int32_t total_entries = 0;
- int32_t chunk2entry;
- int32_t chunk1, chunk2, chunk1samples, range_samples, total = 0;
-
- *chunk_sample = 0;
- *chunk = 1;
- if (f->track[track] == NULL) {
- return -1;
- }
-
- total_entries = f->track[track]->stsc_entry_count;
-
- chunk1 = 1;
- chunk1samples = 0;
- chunk2entry = 0;
-
- do {
- chunk2 = f->track[track]->stsc_first_chunk[chunk2entry];
- *chunk = chunk2 - chunk1;
- range_samples = *chunk * chunk1samples;
+ const struct mp4_track *t = f->audio_track;
+ uint32_t *fc = t->stsc_first_chunk, *spc = t->stsc_samples_per_chunk;
+ int32_t chunk1, chunk1samples, n, total, i;
- if (sample < total + range_samples)
+ for (i = 1, total = 0; i < t->stsc_entry_count; i++, total += n) {
+ n = (fc[i] - fc[i - 1]) * spc[i - 1]; /* number of samples */
+ if (sample < total + n)
break;
-
- chunk1samples = f->track[track]->stsc_samples_per_chunk[chunk2entry];
- chunk1 = chunk2;
-
- if (chunk2entry < total_entries) {
- chunk2entry++;
- total += range_samples;
- }
- } while (chunk2entry < total_entries);
-
- if (chunk1samples)
+ }
+ chunk1 = fc[i - 1];
+ chunk1samples = spc[i - 1];
+ if (chunk1samples != 0)
*chunk = (sample - total) / chunk1samples + chunk1;
else
*chunk = 1;
-
- *chunk_sample = total + (*chunk - chunk1) * chunk1samples;
-
- return 0;
-}
-
-static int32_t chunk_to_offset(const struct mp4 *f, int32_t track,
- int32_t chunk)
-{
- const struct mp4_track *p_track = f->track[track];
-
- if (p_track->stco_entry_count && (chunk > p_track->stco_entry_count)) {
- return p_track->stco_chunk_offset[p_track->stco_entry_count -
- 1];
- } else if (p_track->stco_entry_count) {
- return p_track->stco_chunk_offset[chunk - 1];
- } else {
- return 8;
- }
-
- return 0;
-}
-
-static int32_t sample_range_size(const struct mp4 *f, int32_t track,
- int32_t chunk_sample, int32_t sample)
-{
- int32_t i, total;
- const struct mp4_track *p_track = f->track[track];
-
- if (p_track->stsz_sample_size) {
- return (sample - chunk_sample) * p_track->stsz_sample_size;
- } else {
- if (sample >= p_track->stsz_sample_count)
- return 0; //error
-
- for (i = chunk_sample, total = 0; i < sample; i++) {
- total += p_track->stsz_table[i];
- }
- }
-
- return total;
-}
-
-static int32_t sample_to_offset(const struct mp4 *f, int32_t track,
- int32_t sample)
-{
- int32_t chunk, chunk_sample, chunk_offset1, chunk_offset2;
-
- chunk_of_sample(f, track, sample, &chunk_sample, &chunk);
-
- chunk_offset1 = chunk_to_offset(f, track, chunk);
- chunk_offset2 = chunk_offset1 + sample_range_size(f,
- track, chunk_sample, sample);
- return chunk_offset2;
+ return total + (*chunk - chunk1) * chunk1samples;
}
/**
- * Return the number of milliseconds of the given track.
+ * Return the number of milliseconds of the audio track.
*
* \param f As returned by \ref mp4_open_read(), must not be NULL.
- * \param track Between zero and the value returned by \ref mp4_total_tracks().
- *
- * The function returns zero if the audio file is of zero length or contains a
- * corrupt track header.
*/
-uint64_t mp4_get_duration(const struct mp4 *f, int32_t track)
+uint64_t mp4_get_duration(const struct mp4 *f)
{
- const struct mp4_track *t = f->track[track];
+ const struct mp4_track *t = f->audio_track;
if (t->timeScale == 0)
return 0;
return t->duration * 1000 / t->timeScale;
}
-/**
- * Check whether the given track number corresponds to an audio track.
- *
- * \param f See \ref mp4_get_duration().
- * \param track See \ref mp4_get_duration().
- *
- * Besides audio tracks, an mp4 file may contain video and system tracks. For
- * those the function returns false.
- */
-bool mp4_is_audio_track(const struct mp4 *f, int32_t track)
+int mp4_set_sample_position(struct mp4 *f, int32_t sample)
{
- return f->track[track]->is_audio;
-}
+ const struct mp4_track *t = f->audio_track;
+ int32_t offset, chunk, chunk_sample;
+ uint32_t n, srs; /* sample range size */
-void mp4_set_sample_position(struct mp4 *f, int32_t track, int32_t sample)
-{
- int32_t offset = sample_to_offset(f, track, sample);
- set_position(f, offset);
+ if (sample >= t->stsz_sample_count)
+ return -ERRNO_TO_PARA_ERROR(EINVAL);
+ chunk_sample = chunk_of_sample(f, sample, &chunk);
+ if (t->stsz_sample_size > 0)
+ srs = (sample - chunk_sample) * t->stsz_sample_size;
+ else {
+ for (srs = 0, n = chunk_sample; n < sample; n++)
+ srs += t->stsz_table[n];
+ }
+ if (t->stco_entry_count > 0 && chunk > t->stco_entry_count)
+ offset = t->stco_chunk_offset[t->stco_entry_count - 1];
+ else if (t->stco_entry_count > 0)
+ offset = t->stco_chunk_offset[chunk - 1];
+ else
+ offset = 8;
+ set_position(f, offset + srs);
+ return 1;
}
-int32_t mp4_get_sample_size(const struct mp4 *f, int track, int sample)
+int32_t mp4_get_sample_size(const struct mp4 *f, int sample)
{
- const struct mp4_track *t = f->track[track];
+ const struct mp4_track *t = f->audio_track;
if (t->stsz_sample_size != 0)
return t->stsz_sample_size;
return t->stsz_table[sample];
}
-uint32_t mp4_get_sample_rate(const struct mp4 *f, int32_t track)
+uint32_t mp4_get_sample_rate(const struct mp4 *f)
{
- return f->track[track]->sampleRate;
+ return f->audio_track->sampleRate;
}
-uint32_t mp4_get_channel_count(const struct mp4 *f, int32_t track)
+uint32_t mp4_get_channel_count(const struct mp4 *f)
{
- return f->track[track]->channelCount;
+ return f->audio_track->channelCount ;
}
-int32_t mp4_num_samples(const struct mp4 *f, int32_t track)
+int32_t mp4_num_samples(const struct mp4 *f)
{
+ const struct mp4_track *t = f->audio_track;
int32_t i;
int32_t total = 0;
- for (i = 0; i < f->track[track]->stts_entry_count; i++) {
- total += f->track[track]->stts_sample_count[i];
- }
+ for (i = 0; i < t->stts_entry_count; i++)
+ total += t->stts_sample_count[i];
return total;
}
struct mp4 *f = para_calloc(sizeof(struct mp4));
f->cb = cb;
- ret = parse_atoms(f, 1);
+ ret = parse_root_atoms(f, 1);
if (ret < 0) {
free(f);
return NULL;
projects / paraslash.git / blobdiff