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Code Issues Releases Activity

Remove output pointer from context

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Originally committed as revision 15243 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-09-07 09:38:37 +00:00
parent bd547403fe
commit b6d544f54e
1 changed files with 21 additions and 19 deletions
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40
libavcodec/mace.c
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@ -236,10 +236,10 @@ static const uint16_t MACEtab4[][8] = {
typedef struct MACEContext {
short index, lev, factor, prev2, previous, level;
short *outPtr;
} MACEContext;
static void chomp3(MACEContext *ctx, uint8_t val, const uint16_t tab1[],
static void chomp3(MACEContext *ctx, int16_t *output, uint8_t val,
const uint16_t tab1[],
const uint16_t tab2[][8], uint32_t numChannels)
{
short current;
@ -255,13 +255,13 @@ static void chomp3(MACEContext *ctx, uint8_t val, const uint16_t tab1[],
ctx->lev = current - (current >> 3);
//*ctx->outPtr++=current >> 8;
*ctx->outPtr = current;
ctx->outPtr += numChannels;
*output = current;
if (( ctx->index += tab1[val]-(ctx->index >> 5) ) < 0)
ctx->index = 0;
}
static void chomp6(MACEContext *ctx, uint8_t val, const uint16_t tab1[],
static void chomp6(MACEContext *ctx, int16_t *output, uint8_t val,
const uint16_t tab1[],
const uint16_t tab2[][8], uint32_t numChannels)
{
short current;
@ -292,10 +292,8 @@ static void chomp6(MACEContext *ctx, uint8_t val, const uint16_t tab1[],
// *ctx->outPtr++=(ctx->previous+ctx->prev2-((ctx->prev2-current) >> 2)) >> 8;
// *ctx->outPtr++=(ctx->previous+current+((ctx->prev2-current) >> 2)) >> 8;
*ctx->outPtr = (ctx->previous + ctx->prev2 - ((ctx->prev2-current) >> 2));
ctx->outPtr += numChannels;
*ctx->outPtr = (ctx->previous + current + ((ctx->prev2-current) >> 2));
ctx->outPtr += numChannels;
output[0] = (ctx->previous + ctx->prev2 - ((ctx->prev2-current) >> 2));
output[numChannels] = (ctx->previous + current + ((ctx->prev2-current) >> 2));
ctx->prev2 = ctx->previous;
ctx->previous = current;
@ -320,16 +318,18 @@ static int mace3_decode_frame(AVCodecContext *avctx,
int i, j, k;
for(i = 0; i < avctx->channels; i++) {
int16_t *output = samples + i;
ctx->index = ctx->lev = 0;
ctx->outPtr = samples + i;
for (j=0; j < buf_size / 2 / avctx->channels; j++)
for (k=0; k < 2; k++) {
uint8_t pkt = buf[i*2 + j*2*avctx->channels + k];
chomp3(ctx, pkt &7, MACEtab1, MACEtab2, avctx->channels);
chomp3(ctx,(pkt >> 3) &3, MACEtab3, MACEtab4, avctx->channels);
chomp3(ctx, pkt >> 5 , MACEtab1, MACEtab2, avctx->channels);
chomp3(ctx, output, pkt &7, MACEtab1, MACEtab2, avctx->channels);
output += avctx->channels;
chomp3(ctx, output,(pkt >> 3) &3, MACEtab3, MACEtab4, avctx->channels);
output += avctx->channels;
chomp3(ctx, output, pkt >> 5 , MACEtab1, MACEtab2, avctx->channels);
output += avctx->channels;
}
}
@ -347,16 +347,18 @@ static int mace6_decode_frame(AVCodecContext *avctx,
int i, j;
for(i = 0; i < avctx->channels; i++) {
int16_t *output = samples + i;
ctx->previous = ctx->prev2 = ctx->index = ctx->level = ctx->factor = 0;
ctx->outPtr = samples + i;
for (j = 0; j < buf_size / avctx->channels; j++) {
uint8_t pkt = buf[i + j*avctx->channels];
chomp6(ctx, pkt >> 5 , MACEtab1, MACEtab2, avctx->channels);
chomp6(ctx,(pkt >> 3) & 3, MACEtab3, MACEtab4, avctx->channels);
chomp6(ctx, pkt & 7, MACEtab1, MACEtab2, avctx->channels);
chomp6(ctx, output, pkt >> 5 , MACEtab1, MACEtab2, avctx->channels);
output += avctx->channels << 1;
chomp6(ctx, output,(pkt >> 3) & 3, MACEtab3, MACEtab4, avctx->channels);
output += avctx->channels << 1;
chomp6(ctx, output, pkt & 7, MACEtab1, MACEtab2, avctx->channels);
output += avctx->channels << 1;
}
}