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libmpeg2: Decode only Y on grayscale targets. The chroma skip code is probably less than optimal since it's basically the decoding code with minimum reading of the bitstream but it does the trick for now and gets some more FPS.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@16093 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2008-01-16 01:22:56 +00:00
parent 74d61058dc
commit 0c7f2372d5
7 changed files with 680 additions and 115 deletions
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15
apps/plugins/mpegplayer/decode.c
View file

@ -37,6 +37,10 @@ extern struct plugin_api* rb;
/* twice as large as on other targets because coldfire uses
* a secondary, transposed buffer for optimisation */
static int16_t static_dct_block[128] IBSS_ATTR ATTR_ALIGN(16);
#define DCT_BLOCKSIZE (128 * sizeof (int16_t))
#else
static int16_t static_dct_block[64] IBSS_ATTR ATTR_ALIGN(16);
#define DCT_BLOCKSIZE (64 * sizeof (int16_t))
#endif
const mpeg2_info_t * mpeg2_info (mpeg2dec_t * mpeg2dec)
@ -410,7 +414,7 @@ int mpeg2_stride (mpeg2dec_t * mpeg2dec, int stride)
return stride;
}
void mpeg2_set_buf (mpeg2dec_t * mpeg2dec, uint8_t * buf[3], void * id)
void mpeg2_set_buf (mpeg2dec_t * mpeg2dec, uint8_t * buf[MPEG2_COMPONENTS], void * id)
{
mpeg2_fbuf_t * fbuf;
@ -434,8 +438,10 @@ void mpeg2_set_buf (mpeg2dec_t * mpeg2dec, uint8_t * buf[3], void * id)
}
fbuf->buf[0] = buf[0];
#if MPEG2_COLOR
fbuf->buf[1] = buf[1];
fbuf->buf[2] = buf[2];
#endif
fbuf->id = id;
}
@ -502,12 +508,11 @@ mpeg2dec_t * mpeg2_init (void)
if (mpeg2dec == NULL)
return NULL;
#ifdef CPU_COLDFIRE
mpeg2dec->decoder.DCTblock = static_dct_block;
#endif
rb->memset (mpeg2dec->decoder.DCTblock, 0, 64 * sizeof (int16_t));
rb->memset (mpeg2dec->quantizer_matrix, 0, 4 * 64 * sizeof (uint8_t));
rb->memset (mpeg2dec->decoder.DCTblock, 0, DCT_BLOCKSIZE);
DEBUGF("DCTblock: %p\n", mpeg2dec->decoder.DCTblock);
mpeg2dec->chunk_buffer = (uint8_t *)mpeg2_bufalloc(BUFFER_SIZE + 4,
MPEG2_ALLOC_CHUNK);