#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
}
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
}
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;
}