#include "mp4.h"
struct mp4_track {
- uint16_t channelCount;
- uint16_t sampleRate;
+ /* mp4a */
+ uint16_t channel_count;
+ uint16_t sample_rate;
/* stsz */
uint32_t stsz_sample_size;
uint32_t stco_entry_count;
uint32_t *stco_chunk_offset;
- uint32_t timeScale;
+ /* mdhd */
+ uint32_t time_scale;
uint64_t duration;
};
ret = read_int32(f, NULL); /* reserved */
if (ret <= 0)
return ret;
- ret = read_int16(f, &t->channelCount);
+ ret = read_int16(f, &t->channel_count);
if (ret <= 0)
return ret;
ret = read_int16(f, NULL);
ret = read_int16(f, NULL);
if (ret <= 0)
return ret;
- return read_int16(f, &t->sampleRate);
+ return read_int16(f, &t->sample_rate);
}
static int read_stsd(struct mp4 *f)
ret = read_int64(f, NULL); /* modification-time */
if (ret <= 0)
return ret;
- ret = read_int32(f, &t->timeScale);
+ ret = read_int32(f, &t->time_scale);
if (ret <= 0)
return ret;
ret = read_int64(f, &t->duration);
ret = read_int32(f, NULL); /* modification-time */
if (ret <= 0)
return ret;
- ret = read_int32(f, &t->timeScale);
+ ret = read_int32(f, &t->time_scale);
if (ret <= 0)
return ret;
ret = read_int32(f, &temp);
{
const struct mp4_track *t = f->audio_track;
- if (t->timeScale == 0)
+ if (t->time_scale == 0)
return 0;
- return t->duration * 1000 / t->timeScale;
+ return t->duration * 1000 / t->time_scale;
}
int mp4_set_sample_position(struct mp4 *f, int32_t sample)
uint32_t mp4_get_sample_rate(const struct mp4 *f)
{
- return f->audio_track->sampleRate;
+ return f->audio_track->sample_rate;
}
uint32_t mp4_get_channel_count(const struct mp4 *f)
{
- return f->audio_track->channelCount ;
+ return f->audio_track->channel_count;
}
int32_t mp4_num_samples(const struct mp4 *f)
}
}
-static uint32_t fix_byte_order_32(uint32_t src)
-{
- return read_u32_be(&src);
-}
-
static void *modify_moov(struct mp4 *f, uint32_t *out_size)
{
int ret;
ret = read_int32(f, &tmp);
if (ret <= 0)
return NULL;
- *(uint32_t *)p_out = fix_byte_order_32(tmp + size_delta);
+ write_u32_be(p_out, tmp + size_delta);
p_out += 4;
ret = read_data(f, p_out, 4);
if (ret <= 0)
ret = read_int32(f, &tmp);
if (ret <= 0)
return NULL;
- *(uint32_t *)p_out = fix_byte_order_32(tmp + size_delta);
+ write_u32_be(p_out, tmp + size_delta);
p_out += 4;
ret = read_data(f, p_out, 4);
if (ret <= 0)
ret = read_int32(f, &tmp);
if (ret <= 0)
return NULL;
- *(uint32_t *)p_out = fix_byte_order_32(tmp + size_delta);
+ write_u32_be(p_out, tmp + size_delta);
p_out += 4;
ret = read_data(f, p_out, 4);
if (ret <= 0)
return result;
}
-static int32_t write_int32(struct mp4 *f, uint32_t data)
-{
- int8_t temp[4];
- write_u32_be(temp, data);
- return write_data(f, temp, sizeof(temp));
-}
-
int32_t mp4_meta_update(struct mp4 *f)
{
void *new_moov_data;
uint32_t new_moov_size;
+ uint8_t buf[4];
set_position(f, 0);
new_moov_data = modify_moov(f, &new_moov_size);
mp4_close(f);
return 0;
}
- /* copy moov atom to end of the file */
if (f->last_atom != ATOM_MOOV) {
- char *free_data = "free";
-
- /* rename old moov to free */
set_position(f, f->moov_offset + 4);
- write_data(f, free_data, 4);
-
- set_position(f, f->file_size);
- write_int32(f, new_moov_size + 8);
- write_data(f, "moov", 4);
- write_data(f, new_moov_data, new_moov_size);
- } else {
+ write_data(f, "free", 4); /* rename old moov to free */
+ set_position(f, f->file_size); /* write new moov atom at EOF */
+ } else /* overwrite old moov atom */
set_position(f, f->moov_offset);
- write_int32(f, new_moov_size + 8);
- write_data(f, "moov", 4);
- write_data(f, new_moov_data, new_moov_size);
- }
+ write_u32_be(buf, new_moov_size + 8);
+ write_data(f, buf, 4);
+ write_data(f, "moov", 4);
+ write_data(f, new_moov_data, new_moov_size);
free(new_moov_data);
f->cb->truncate(f->cb->user_data);
return 1;