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Code Issues Releases Activity

Do not share context variables between channels and do not zero them at

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decode_frame(). This makes the output much closer to that of the binary decoder.

Originally committed as revision 15244 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-09-07 09:42:57 +00:00
parent b6d544f54e
commit 4ea70242a8
1 changed files with 13 additions and 11 deletions
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24
libavcodec/mace.c
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@ -234,11 +234,15 @@ static const uint16_t MACEtab4[][8] = {
{ 0x3E22, 0x7FFF, 0x8000, 0xC1DD, 0, 0, 0, 0 }, { 0x40E7, 0x7FFF, 0x8000, 0xBF18, 0, 0, 0, 0 },
};
typedef struct MACEContext {
typedef struct ChannelData {
short index, lev, factor, prev2, previous, level;
} ChannelData;
typedef struct MACEContext {
ChannelData chd[2];
} MACEContext;
static void chomp3(MACEContext *ctx, int16_t *output, uint8_t val,
static void chomp3(ChannelData *ctx, int16_t *output, uint8_t val,
const uint16_t tab1[],
const uint16_t tab2[][8], uint32_t numChannels)
{
@ -260,7 +264,7 @@ static void chomp3(MACEContext *ctx, int16_t *output, uint8_t val,
ctx->index = 0;
}
static void chomp6(MACEContext *ctx, int16_t *output, uint8_t val,
static void chomp6(ChannelData *ctx, int16_t *output, uint8_t val,
const uint16_t tab1[],
const uint16_t tab2[][8], uint32_t numChannels)
{
@ -319,16 +323,15 @@ static int mace3_decode_frame(AVCodecContext *avctx,
for(i = 0; i < avctx->channels; i++) {
int16_t *output = samples + i;
ctx->index = ctx->lev = 0;
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, output, pkt &7, MACEtab1, MACEtab2, avctx->channels);
chomp3(&ctx->chd[i], output, pkt &7, MACEtab1, MACEtab2, avctx->channels);
output += avctx->channels;
chomp3(ctx, output,(pkt >> 3) &3, MACEtab3, MACEtab4, avctx->channels);
chomp3(&ctx->chd[i], output,(pkt >> 3) &3, MACEtab3, MACEtab4, avctx->channels);
output += avctx->channels;
chomp3(ctx, output, pkt >> 5 , MACEtab1, MACEtab2, avctx->channels);
chomp3(&ctx->chd[i], output, pkt >> 5 , MACEtab1, MACEtab2, avctx->channels);
output += avctx->channels;
}
}
@ -348,16 +351,15 @@ static int mace6_decode_frame(AVCodecContext *avctx,
for(i = 0; i < avctx->channels; i++) {
int16_t *output = samples + i;
ctx->previous = ctx->prev2 = ctx->index = ctx->level = ctx->factor = 0;
for (j = 0; j < buf_size / avctx->channels; j++) {
uint8_t pkt = buf[i + j*avctx->channels];
chomp6(ctx, output, pkt >> 5 , MACEtab1, MACEtab2, avctx->channels);
chomp6(&ctx->chd[i], output, pkt >> 5 , MACEtab1, MACEtab2, avctx->channels);
output += avctx->channels << 1;
chomp6(ctx, output,(pkt >> 3) & 3, MACEtab3, MACEtab4, avctx->channels);
chomp6(&ctx->chd[i], output,(pkt >> 3) & 3, MACEtab3, MACEtab4, avctx->channels);
output += avctx->channels << 1;
chomp6(ctx, output, pkt & 7, MACEtab1, MACEtab2, avctx->channels);
chomp6(&ctx->chd[i], output, pkt & 7, MACEtab1, MACEtab2, avctx->channels);
output += avctx->channels << 1;
}
}