static void write_frame_header(AlacEncodeContext *s, int is_verbatim)
{
+ int encode_fs = 0;
+
+ if (s->frame_size < DEFAULT_FRAME_SIZE)
+ encode_fs = 1;
+
put_bits(&s->pbctx, 3, s->avctx->channels-1); // No. of channels -1
put_bits(&s->pbctx, 16, 0); // Seems to be zero
- put_bits(&s->pbctx, 1, 1); // Sample count is in the header
+ put_bits(&s->pbctx, 1, encode_fs); // Sample count is in the header
put_bits(&s->pbctx, 2, 0); // FIXME: Wasted bytes field
put_bits(&s->pbctx, 1, is_verbatim); // Audio block is verbatim
- put_bits32(&s->pbctx, s->frame_size); // No. of samples in the frame
+ if (encode_fs)
+ put_bits32(&s->pbctx, s->frame_size); // No. of samples in the frame
}
static void calc_predictor_params(AlacEncodeContext *s, int ch)
static av_always_inline int get_max_frame_size(int frame_size, int ch, int bps)
{
- return FFALIGN(55 + bps * ch * frame_size + 3, 8) / 8;
+ int header_bits = 23 + 32 * (frame_size < DEFAULT_FRAME_SIZE);
+ return FFALIGN(header_bits + bps * ch * frame_size + 3, 8) / 8;
}
static av_cold int alac_encode_close(AVCodecContext *avctx)
-db1806d9ffd85c168c2c71a28e6d9229 *./tests/data/acodec/alac.m4a
-389410 ./tests/data/acodec/alac.m4a
+b9e78aa8b8774a63d187380a47201a37 *./tests/data/acodec/alac.m4a
+389154 ./tests/data/acodec/alac.m4a
64151e4bcc2b717aa5a8454d424d6a1f *./tests/data/alac.acodec.out.wav
stddev: 0.00 PSNR:999.99 MAXDIFF: 0 bytes: 1058400/ 1058400