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mlpdec: Max filter orders for FIR and IIR are 8 and 4 respectively.

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Originally committed as revision 18230 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ramiro Polla 2009-03-30 02:54:19 +00:00
parent 209b9d565a
commit 0c5670a0e5
2 changed files with 11 additions and 12 deletions
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12
libavcodec/mlp.h
View File

@ -50,11 +50,9 @@
/** number of allowed filters */
#define NUM_FILTERS 2
/** The maximum number of taps in either the IIR or FIR filter;
* I believe MLP actually specifies the maximum order for IIR filters as four,
* and that the sum of the orders of both filters must be <= 8.
*/
#define MAX_FILTER_ORDER 8
/** The maximum number of taps in IIR and FIR filters. */
#define MAX_FIR_ORDER 8
#define MAX_IIR_ORDER 4
/** Code that signals end of a stream. */
#define END_OF_STREAM 0xd234d234
@ -67,8 +65,8 @@ typedef struct {
uint8_t order; ///< number of taps in filter
uint8_t shift; ///< Right shift to apply to output of filter.
int32_t coeff[MAX_FILTER_ORDER];
int32_t state[MAX_FILTER_ORDER];
int32_t coeff[MAX_FIR_ORDER];
int32_t state[MAX_FIR_ORDER];
} FilterParams;
/** sample data coding information */

11
libavcodec/mlpdec.c
View File

@ -433,6 +433,7 @@ static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp,
unsigned int channel, unsigned int filter)
{
FilterParams *fp = &m->channel_params[channel].filter_params[filter];
const int max_order = filter ? MAX_IIR_ORDER : MAX_FIR_ORDER;
const char fchar = filter ? 'I' : 'F';
int i, order;
@ -440,10 +441,10 @@ static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp,
assert(filter < 2);
order = get_bits(gbp, 4);
if (order > MAX_FILTER_ORDER) {
if (order > max_order) {
av_log(m->avctx, AV_LOG_ERROR,
"%cIR filter order %d is greater than maximum %d.\n",
fchar, order, MAX_FILTER_ORDER);
fchar, order, max_order);
return -1;
}
fp->order = order;
@ -651,7 +652,7 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr,
unsigned int channel)
{
SubStream *s = &m->substream[substr];
int32_t filter_state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FILTER_ORDER];
int32_t filter_state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FIR_ORDER];
FilterParams *fp[NUM_FILTERS] = { &m->channel_params[channel].filter_params[FIR],
&m->channel_params[channel].filter_params[IIR], };
unsigned int filter_shift = fp[FIR]->shift;
@ -661,7 +662,7 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr,
for (j = 0; j < NUM_FILTERS; j++) {
memcpy(&filter_state_buffer[j][MAX_BLOCKSIZE], &fp[j]->state[0],
MAX_FILTER_ORDER * sizeof(int32_t));
MAX_FIR_ORDER * sizeof(int32_t));
}
for (i = 0; i < s->blocksize; i++) {
@ -690,7 +691,7 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr,
for (j = 0; j < NUM_FILTERS; j++) {
memcpy(&fp[j]->state[0], &filter_state_buffer[j][index],
MAX_FILTER_ORDER * sizeof(int32_t));
MAX_FIR_ORDER * sizeof(int32_t));
}
}