/* This is a version of avi_writer_pop_chunk() that adds the finished chunk
* to this AVI file's index, using the provided flags.
*/
static void avi_writer_pop_chunk_with_index (AviWriter *self, int index_flags)
{
IndexQueueEntry *new_entry = g_new(IndexQueueEntry, 1);
ChunkStackEntry *current_chunk = self->chunk_stack->data;
long current_offset = ftell(self->file);
memcpy(new_entry->fourcc, current_chunk->fourcc, 5);
new_entry->flags = index_flags;
new_entry->offset = current_chunk->data_start - self->index_origin_offset - 4;
new_entry->size = current_offset - current_chunk->data_start;
g_queue_push_tail(self->index_queue, new_entry);
avi_writer_pop_chunk(self);
}
static void avi_writer_write_stream_header(AviWriter *self) {
avi_writer_push_chunk(self, "strh");
/* data type: video stream */
write_fourcc(self->file, "vids");
/* data handler (video codec) */
write_fourcc(self->file, "DIB ");
/* flags */
write_int32(self->file, 0);
/* priority */
write_int16(self->file, 1);
/* language */
write_int16(self->file, 0);
/* initial frames */
write_int32(self->file, 0);
/* scale followed by rate. For video streams, (rate/scale) is the frame rate. */
write_int32(self->file, RATE_SCALE);
write_int32(self->file, self->frame_rate * RATE_SCALE);
/* start */
write_int32(self->file, 0);
/* length (we fill this in later) */
self->length_offset = ftell(self->file);
write_int32(self->file, 0);
/* suggested buffer size */
write_int32(self->file, self->width * self->height * 3 + 1024);
/* quality */
write_int32(self->file, 10000);
/* sample size */
write_int32(self->file, 0);
/* frame position and size (left, top, right, bottom) */
write_int16(self->file, 0);
write_int16(self->file, 0);
write_int16(self->file, self->width - 1);
write_int16(self->file, self->height - 1);
avi_writer_pop_chunk(self);
}
/* Write the "idx1" list, using the queued chunk positions from our index FIFO */
static void avi_writer_write_index(AviWriter *self)
{
IndexQueueEntry *current_entry;
avi_writer_push_chunk(self, "idx1");
/* Write all IndexQueueEntry nodes, freeing them as we go */
while ((current_entry = g_queue_pop_head(self->index_queue))) {
write_fourcc(self->file, current_entry->fourcc);
write_int32(self->file, current_entry->flags);
write_int32(self->file, current_entry->offset);
write_int32(self->file, current_entry->size);
g_free(current_entry);
}
avi_writer_pop_chunk(self);
}
static void avi_writer_write_main_header(AviWriter *self) {
avi_writer_push_chunk(self, "avih");
/* microseconds per frame */
write_int32(self->file, 1000000 / self->frame_rate);
/* max bytes per second */
write_int32(self->file, 0);
/* padding granularity */
write_int32(self->file, 0);
/* flags (AVIF_* constants) */
write_int32(self->file, AVIF_HASINDEX);
/* total frames (we fill this in later) */
self->frame_count_offset = ftell(self->file);
write_int32(self->file, 0);
/* inital frames */
write_int32(self->file, 0);
/* number of streams */
write_int32(self->file, 1);
/* suggested buffer size */
write_int32(self->file, self->width * self->height * 3 + 1024);
/* width and height */
write_int32(self->file, self->width);
write_int32(self->file, self->height);
/* reserved (4) */
write_int32(self->file, 0);
write_int32(self->file, 0);
write_int32(self->file, 0);
write_int32(self->file, 0);
avi_writer_pop_chunk(self);
}
