#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;
return f->current_position;
}
-static int need_parse_when_meta_only(uint8_t atom_type)
-{
- switch (atom_type) {
- case ATOM_EDTS:
- case ATOM_DRMS:
- case ATOM_SINF:
- case ATOM_SCHI:
- case ATOM_STTS:
- case ATOM_STSZ:
- case ATOM_STZ2:
- case ATOM_STCO:
- case ATOM_STSC:
- case ATOM_FRMA:
- case ATOM_IVIV:
- case ATOM_PRIV:
- return 0;
- default:
- return 1;
- }
-}
-
static int32_t set_position(struct mp4 *f, int64_t position)
{
f->cb->seek(f->cb->user_data, position);
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;
}
{
int ret;
int32_t i;
- uint8_t atom_type = 0;
- uint8_t header_size = 0;
struct mp4_track *t;
if (f->total_tracks == 0)
ret = read_int16(f, NULL);
if (ret <= 0)
return ret;
- ret = read_int16(f, &t->sampleRate);
- if (ret <= 0)
- return ret;
- ret = read_int16(f, NULL);
- if (ret <= 0)
- return ret;
- return atom_read_header(f, &atom_type, &header_size, NULL);
+ return read_int16(f, &t->sampleRate);
}
static int read_stsd(struct mp4 *f)
{
int ret;
uint32_t i, entry_count;
- uint8_t header_size = 0;
struct mp4_track *t;
if (f->total_tracks == 0)
uint64_t skip = get_position(f);
uint64_t size;
uint8_t atom_type = 0;
- ret = atom_read_header(f, &atom_type, &header_size, &size);
+ ret = atom_read_header(f, &atom_type, NULL, &size);
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;
}
-static int32_t tag_add_field(struct mp4_metadata *meta, const char *item,
- const char *value, int32_t len)
-{
- meta->tags = para_realloc(meta->tags,
- (meta->count + 1) * sizeof(struct mp4_tag));
- meta->tags[meta->count].item = para_strdup(item);
- meta->tags[meta->count].len = len;
- if (len >= 0) {
- meta->tags[meta->count].value = para_malloc(len + 1);
- memcpy(meta->tags[meta->count].value, value, len);
- meta->tags[meta->count].value[len] = 0;
- } else {
- meta->tags[meta->count].value = para_strdup(value);
- }
- meta->count++;
- return 1;
-}
-
-static int read_string(struct mp4 *f, uint32_t length, char **result)
-{
- char *str = para_malloc(length + 1);
- int ret = read_data(f, str, length);
-
- if (ret <= 0) {
- free(str);
- *result = NULL;
- } else {
- str[length] = '\0';
- *result = str;
- }
- return ret;
-}
-
static const char *get_metadata_name(uint8_t atom_type)
{
switch (atom_type) {
{
int ret;
uint64_t subsize, sumsize;
- char *data = NULL;
+ char *value = NULL;
uint32_t len = 0;
uint64_t destpos;
+ struct mp4_tag *tag;
for (
sumsize = 0;
uint8_t header_size = 0;
ret = atom_read_header(f, &atom_type, &header_size, &subsize);
if (ret <= 0)
- return ret;
+ goto fail;
destpos = get_position(f) + subsize - header_size;
if (atom_type != ATOM_DATA)
continue;
ret = read_int8(f, NULL); /* version */
if (ret <= 0)
- return ret;
+ goto fail;
ret = read_int24(f, NULL); /* flags */
if (ret <= 0)
- return ret;
+ goto fail;
ret = read_int32(f, NULL); /* reserved */
if (ret <= 0)
- return ret;
- free(data);
- ret = read_string(f, subsize - (header_size + 8), &data);
- if (ret <= 0)
- return ret;
+ goto fail;
+ ret = -ERRNO_TO_PARA_ERROR(EINVAL);
+ if (subsize < header_size + 8 || subsize > UINT_MAX)
+ goto fail;
len = subsize - (header_size + 8);
+ free(value);
+ value = para_malloc(len + 1);
+ ret = read_data(f, value, len);
+ if (ret <= 0)
+ goto fail;
+ value[len] = '\0';
}
- if (!data)
- return -1;
- tag_add_field(&f->meta, get_metadata_name(parent), data, len);
- free(data);
+ if (!value)
+ return -ERRNO_TO_PARA_ERROR(EINVAL);
+ f->meta.tags = para_realloc(f->meta.tags, (f->meta.count + 1)
+ * sizeof(struct mp4_tag));
+ tag = f->meta.tags + f->meta.count;
+ tag->item = para_strdup(get_metadata_name(parent));
+ tag->value = value;
+ tag->len = len;
+ f->meta.count++;
return 1;
+fail:
+ free(value);
+ return ret;
}
static int read_mdhd(struct mp4 *f)
case ATOM_ALBUM:
case ATOM_COMMENT:
case ATOM_DATE:
- parse_tag(f, atom_type, subsize - header_size);
+ ret = parse_tag(f, atom_type, subsize - header_size);
+ if (ret <= 0)
+ return ret;
}
set_position(f, destpos);
sumsize += subsize;
return ret;
if (subsize <= header_size + 4)
return 1;
- if (atom_type == ATOM_ILST)
- read_ilst(f, subsize - (header_size + 4));
- else
+ if (atom_type == ATOM_ILST) {
+ ret = read_ilst(f, subsize - (header_size + 4));
+ if (ret <= 0)
+ return ret;
+ } else
set_position(f, get_position(f) + subsize - header_size);
sumsize += subsize;
}
return 1;
}
-static int atom_read(struct mp4 *f, uint64_t size, uint8_t atom_type)
+static int parse_leaf_atom(struct mp4 *f, uint64_t size, uint8_t atom_type)
{
uint64_t dest_position = get_position(f) + size - 8;
int ret = 1; /* return success for atoms we don't care about */
return ret;
}
+static bool need_atom(uint8_t atom_type, bool meta_only)
+{
+ /* these are needed in any case */
+ switch (atom_type) {
+ case ATOM_STSD:
+ case ATOM_META:
+ case ATOM_TRAK:
+ case ATOM_MDIA:
+ case ATOM_MINF:
+ case ATOM_STBL:
+ return true;
+ }
+ /* meta-only opens don't need anything else */
+ if (meta_only)
+ return false;
+ /* these are only required for regular opens */
+ switch (atom_type) {
+ case ATOM_STTS:
+ case ATOM_STSZ:
+ case ATOM_STCO:
+ case ATOM_STSC:
+ case ATOM_MDHD:
+ case ATOM_UDTA:
+ return true;
+ }
+ return false;
+}
+
/* parse atoms that are sub atoms of other atoms */
-static int parse_sub_atoms(struct mp4 *f, uint64_t total_size, int meta_only)
+static int parse_sub_atoms(struct mp4 *f, uint64_t total_size, bool meta_only)
{
int ret;
uint64_t size;
f->track[f->total_tracks - 1] = para_calloc(
sizeof(struct mp4_track));
}
- /* parse subatoms */
- if (meta_only && !need_parse_when_meta_only(atom_type)) {
+ if (!need_atom(atom_type, meta_only)) {
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 {
- ret = atom_read(f, size, atom_type);
- if (ret <= 0)
- return ret;
+ continue;
}
+ if (atom_type < SUBATOMIC) /* atom contains subatoms */
+ ret = parse_sub_atoms(f, size - header_size, meta_only);
+ else
+ ret = parse_leaf_atom(f, size, atom_type);
+ if (ret <= 0)
+ return ret;
}
return 1;
}
-/* parse root atoms */
-static int parse_atoms(struct mp4 *f, int meta_only)
+static int parse_root_atoms(struct mp4 *f, bool 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, false);
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;
+ 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;
- 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;
-
- 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 *t = f->track[track];
-
- if (t->stsz_sample_size)
- return (sample - chunk_sample) * t->stsz_sample_size;
- for (i = chunk_sample, total = 0; i < sample; i++)
- total += t->stsz_table[i];
- return total;
+ 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_get_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;
}
-int32_t mp4_get_total_tracks(const struct mp4 *f)
-{
- return f->total_tracks;
-}
-
-/**
- * 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)
-{
- return f->track[track]->is_audio;
-}
-
-int mp4_set_sample_position(struct mp4 *f, uint32_t track, int32_t sample)
+int mp4_set_sample_position(struct mp4 *f, int32_t sample)
{
- const struct mp4_track *t = f->track[track];
+ const struct mp4_track *t = f->audio_track;
int32_t offset, chunk, chunk_sample;
+ uint32_t n, srs; /* sample range size */
- if (sample >= t->stsz_sample_count || track >= f->total_tracks)
+ if (sample >= t->stsz_sample_count)
return -ERRNO_TO_PARA_ERROR(EINVAL);
- chunk_of_sample(f, track, sample, &chunk_sample, &chunk);
- offset = chunk_to_offset(f, track, chunk)
- + sample_range_size(f, track, chunk_sample, sample);
- set_position(f, offset);
+ 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, true);
if (ret < 0) {
free(f);
return NULL;
return ret;
}
-struct stdmeta_entry {
- const char *atom;
- const char *name;
-};
-
-static const char *find_standard_meta(const char *name)
-{
- const struct stdmeta_entry stdmetas[] = {
- {"\xA9" "nam", "title"},
- {"\xA9" "ART", "artist"},
- {"\xA9" "alb", "album"},
- {"\xA9" "day", "date"},
- {"\xA9" "cmt", "comment"},
- };
-
- for (unsigned n = 0; n < ARRAY_SIZE(stdmetas); n++)
- if (!strcasecmp(name, stdmetas[n].name))
- return stdmetas[n].atom;
- return NULL;
-}
-
-static uint32_t create_ilst(const struct mp4_metadata *meta, void **out_buffer,
- uint32_t * out_size)
+static void *create_ilst(const struct mp4_metadata *meta, uint32_t *out_size)
{
struct membuffer *buf = membuffer_create();
- unsigned metaptr;
-
- for (metaptr = 0; metaptr < meta->count; metaptr++) {
- struct mp4_tag *tag = meta->tags + metaptr;
- const char *std_meta_atom = find_standard_meta(tag->item);
- if (std_meta_atom)
- membuffer_write_std_tag(buf, std_meta_atom, tag->value);
+ unsigned n;
+
+ for (n = 0; n < meta->count; n++) {
+ struct mp4_tag *tag = meta->tags + n;
+ const char *atom_name;
+ if (!strcasecmp(tag->item, "title"))
+ atom_name = "\xA9" "nam";
+ else if (!strcasecmp(tag->item, "artist"))
+ atom_name = "\xA9" "ART";
+ else if (!strcasecmp(tag->item, "album"))
+ atom_name = "\xA9" "alb";
+ else if (!strcasecmp(tag->item, "date"))
+ atom_name = "\xA9" "day";
+ else if (!strcasecmp(tag->item, "comment"))
+ atom_name = "\xA9" "cmt";
else
- PARA_ERROR_LOG("invalid tag item: %s\n", tag->item);
+ assert(false);
+ membuffer_write_std_tag(buf, atom_name, tag->value);
}
*out_size = membuffer_get_size(buf);
- *out_buffer = membuffer_detach(buf);
- return 1;
+ return membuffer_detach(buf);
}
static void membuffer_write_atom(struct membuffer *buf, const char *name, unsigned size,
uint32_t ilst_size;
void *ilst_buffer;
- if (!create_ilst(meta, &ilst_buffer, &ilst_size))
- return 0;
+ ilst_buffer = create_ilst(meta, &ilst_size);
buf = membuffer_create();
-
membuffer_write_int32(buf, 0);
membuffer_write_atom(buf, "ilst", ilst_size, ilst_buffer);
free(ilst_buffer);
ret = read_int32(f, &ilst_size);
if (ret <= 0)
return NULL;
- if (!create_ilst(&f->meta, &new_ilst_buffer, &new_ilst_size))
- return NULL;
+ new_ilst_buffer = create_ilst(&f->meta, &new_ilst_size);
size_delta = new_ilst_size - (ilst_size - 8);
*out_size = total_size + size_delta;
out_buffer = para_malloc(*out_size);
projects / paraslash.git / blobdiff