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-rw-r--r--src/chunk.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/src/chunk.c b/src/chunk.c
index 8a91a1d11..65894f733 100644
--- a/src/chunk.c
+++ b/src/chunk.c
@@ -17,8 +17,11 @@
*/
#include "chunk.h"
+#include "audio_format.h"
#include "tag.h"
+#include <assert.h>
+
void
music_chunk_init(struct music_chunk *chunk)
{
@@ -32,3 +35,42 @@ music_chunk_free(struct music_chunk *chunk)
if (chunk->tag != NULL)
tag_free(chunk->tag);
}
+
+void *
+music_chunk_write(struct music_chunk *chunk,
+ const struct audio_format *audio_format,
+ float data_time, uint16_t bit_rate,
+ size_t *max_length_r)
+{
+ const size_t frame_size = audio_format_frame_size(audio_format);
+ size_t num_frames;
+
+ if (chunk->length == 0) {
+ /* if the chunk is empty, nobody has set bitRate and
+ times yet */
+
+ chunk->bit_rate = bit_rate;
+ chunk->times = data_time;
+ }
+
+ num_frames = (sizeof(chunk->data) - chunk->length) / frame_size;
+ if (num_frames == 0)
+ return NULL;
+
+ *max_length_r = num_frames * frame_size;
+ return chunk->data + chunk->length;
+}
+
+bool
+music_chunk_expand(struct music_chunk *chunk,
+ const struct audio_format *audio_format, size_t length)
+{
+ const size_t frame_size = audio_format_frame_size(audio_format);
+
+ assert(chunk != NULL);
+ assert(chunk->length + length <= sizeof(chunk->data));
+
+ chunk->length += length;
+
+ return chunk->length + frame_size > sizeof(chunk->data);
+}