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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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18
apps/plugins/mpegplayer/mpeg2_internal.h
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@ -54,7 +54,7 @@ typedef void mpeg2_mc_fct (uint8_t *, const uint8_t *, int, int);
typedef struct
{
uint8_t * ref[2][3];
uint8_t * ref[2][MPEG2_COMPONENTS];
uint8_t ** ref2[2];
int pmv[2][2];
int f_code[2];
@ -74,7 +74,7 @@ struct mpeg2_decoder_s
int bitstream_bits; /* used bits in working set */
const uint8_t * bitstream_ptr; /* buffer with stream data */
uint8_t * dest[3];
uint8_t * dest[MPEG2_COMPONENTS];
int offset;
int stride;
@ -95,16 +95,12 @@ struct mpeg2_decoder_s
motion_parser_t * motion_parser[5];
/* predictor for DC coefficients in intra blocks */
int16_t dc_dct_pred[3];
int16_t dc_dct_pred[MPEG2_COMPONENTS];
/* DCT coefficients */
#ifdef CPU_COLDFIRE
int16_t *DCTblock; /* put buffer separately to have it in IRAM */
#else
int16_t DCTblock[64] ATTR_ALIGN(64);
#endif
int16_t * ATTR_ALIGN(16) DCTblock; /* put buffer separately to have it in IRAM */
uint8_t * picture_dest[3];
uint8_t * picture_dest[MPEG2_COMPONENTS];
void (* convert) (void * convert_id, uint8_t * const * src,
unsigned int v_offset);
void * convert_id;
@ -174,7 +170,7 @@ struct mpeg2dec_s
uint32_t ext_state;
/* allocated in init - gcc has problems allocating such big structures */
uint8_t * chunk_buffer;
uint8_t * ATTR_ALIGN(4) chunk_buffer;
/* pointer to start of the current chunk */
uint8_t * chunk_start;
/* pointer to current position in chunk_buffer */
@ -207,7 +203,7 @@ struct mpeg2dec_s
fbuf_alloc_t fbuf_alloc[3];
int custom_fbuf;
uint8_t * yuv_buf[3][3];
uint8_t * yuv_buf[3][MPEG2_COMPONENTS];
int yuv_index;
mpeg2_convert_t * convert;
void * convert_arg;