#define m4af_realloc(memory,size) realloc(memory, size)
#define m4af_free(memory) free(memory)
+#define m4af_max(a,b) ((a)<(b)?(b):(a))
#define M4AF_ATOM_WILD 0xffffffff
uint32_t bufferSizeDB;
uint32_t maxBitrate;
uint32_t avgBitrate;
+ int is_vbr;
m4af_sample_entry_t *sample_table;
uint32_t num_samples;
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)
{
}
static
-void m4af_update_box_size(m4af_ctx_t *ctx, int64_t pos)
+uint32_t m4af_update_box_size(m4af_ctx_t *ctx, int64_t pos)
{
int64_t current_pos = m4af_tell(ctx);
m4af_set_pos(ctx, pos);
m4af_write32(ctx, current_pos - pos);
m4af_set_pos(ctx, current_pos);
+ return current_pos - pos;
}
static
, 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);
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);
}
static
-void m4af_write_moov_box(m4af_ctx_t *ctx)
+uint32_t m4af_write_moov_box(m4af_ctx_t *ctx)
{
unsigned i;
int64_t pos = m4af_tell(ctx);
m4af_write_trak_box(ctx, i);
if (ctx->num_tags)
m4af_write_udta_box(ctx);
- m4af_update_box_size(ctx, pos);
+ return m4af_update_box_size(ctx, pos);
}
static
m4af_set_pos(ctx, ctx->mdat_pos + ctx->mdat_size);
}
-int m4af_finalize(m4af_ctx_t *ctx)
+static
+void m4af_shift_mdat_pos(m4af_ctx_t *ctx, uint32_t offset)
+{
+ unsigned i, j;
+ int64_t begin, end;
+ char buf[8192];
+
+ end = ctx->mdat_pos + ctx->mdat_size;
+ for (; (begin = m4af_max(ctx->mdat_pos, end - 8192)) < end; end = begin) {
+ m4af_set_pos(ctx, begin);
+ ctx->io.read(ctx->io_cookie, buf, end - begin);
+ m4af_set_pos(ctx, begin + offset);
+ m4af_write(ctx, buf, end - begin);
+ }
+ for (i = 0; i < ctx->num_tracks; ++i)
+ for (j = 0; j < ctx->track[i].num_chunks; ++j)
+ ctx->track[i].chunk_table[j].offset += offset;
+ ctx->mdat_pos += offset;
+ m4af_set_pos(ctx, ctx->mdat_pos - 16);
+ m4af_write_free_box(ctx, 0);
+ m4af_write(ctx, "\0\0\0\0mdat", 8);
+ m4af_finalize_mdat(ctx);
+}
+
+int m4af_finalize(m4af_ctx_t *ctx, int optimize)
{
unsigned i;
m4af_track_t *track;
+ uint32_t moov_size;
for (i = 0; i < ctx->num_tracks; ++i) {
track = ctx->track + i;
(track->encoder_delay || track->padding))
m4af_set_iTunSMPB(ctx);
m4af_finalize_mdat(ctx);
- m4af_write_moov_box(ctx);
+ moov_size = m4af_write_moov_box(ctx);
+ if (optimize) {
+ int64_t pos;
+ m4af_shift_mdat_pos(ctx, moov_size + 1024);
+ m4af_set_pos(ctx, 32);
+ m4af_write_moov_box(ctx);
+ pos = m4af_tell(ctx);
+ m4af_write_free_box(ctx, ctx->mdat_pos - pos - 24);
+ }
return ctx->last_error;
}