typedef struct m4af_track_t {
uint32_t codec;
uint32_t timescale;
+ uint16_t num_channels;
int64_t creation_time;
int64_t modification_time;
int64_t duration;
uint32_t bufferSizeDB;
uint32_t maxBitrate;
uint32_t avgBitrate;
+ int is_vbr;
m4af_sample_entry_t *sample_table;
uint32_t num_samples;
ctx->track[0].timescale = timescale;
ctx->track[0].creation_time = timestamp;
ctx->track[0].modification_time = timestamp;
+ ctx->track[0].num_channels = 2;
return ctx;
}
*ctxp = 0;
}
+void m4af_set_num_channels(m4af_ctx_t *ctx, uint32_t track_idx,
+ uint16_t channels)
+{
+ ctx->track[track_idx].num_channels = channels;
+}
+
void m4af_set_fixed_frame_duration(m4af_ctx_t *ctx, uint32_t track_idx,
uint32_t length)
{
return ctx->last_error;
}
+void m4af_set_vbr_mode(m4af_ctx_t *ctx, uint32_t track_idx, int is_vbr)
+{
+ m4af_track_t *track = &ctx->track[track_idx];
+ track->is_vbr = is_vbr;
+}
+
void m4af_set_priming(m4af_ctx_t *ctx, uint32_t track_idx,
uint32_t encoder_delay, uint32_t padding)
{
, 2);
m4af_write24(ctx, track->bufferSizeDB);
m4af_write32(ctx, track->maxBitrate);
- m4af_write32(ctx, track->avgBitrate);
+ m4af_write32(ctx, track->is_vbr ? 0: track->avgBitrate);
/* DecoderSpecificInfo */
m4af_write_descriptor(ctx, 5, track->decSpecificInfoSize);
m4af_write(ctx, track->decSpecificInfo, track->decSpecificInfoSize);
"\0\001" /* data_reference_index: 1 */
"\0\0\0\0" /* reserved[0] */
"\0\0\0\0" /* reserved[1] */
- "\0\002" /* channelcount: 2 */
+ ,16);
+ m4af_write16(ctx, track->num_channels);
+ m4af_write(ctx,
"\0\020" /* samplesize: 16 */
"\0\0" /* pre_defined */
"\0\0" /* reserved */
- ,24);
+ ,6);
if (track->codec == M4AF_FOURCC('m','p','4','a')) {
m4af_write32(ctx, track->timescale << 16);
m4af_write_esds_box(ctx, track_idx);
static
void m4af_write_sgpd_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
- m4af_track_t *track = &ctx->track[track_idx];
m4af_write(ctx,
- "\0\0\0\032" /* size */
+ "\0\0\0\026" /* size: 22 */
"sgpd" /* type */
- "\001" /* version */
+ "\0" /* version */
"\0\0\0" /* flags */
"roll" /* grouping_type */
- "\0\0\0\002" /* default_length: 2 */
"\0\0\0\001" /* entry_count: 1 */
"\377\377" /* payload_data: -1 */
- , 26);
+ , 22);
}
static
static
void m4af_write_edts_box(m4af_ctx_t *ctx, uint32_t track_idx)
{
- m4af_track_t *track = &ctx->track[track_idx];
int64_t pos = m4af_tell(ctx);
m4af_write(ctx, "\0\0\0\0edts", 8);
m4af_write_elst_box(ctx, track_idx);