[FFmpeg-cvslog] r15244 - trunk/libavcodec/mace.c
vitor
subversion
Sun Sep 7 11:42:58 CEST 2008
Author: vitor
Date: Sun Sep 7 11:42:57 2008
New Revision: 15244
Log:
Do not share context variables between channels and don't zero
them at decode_frame(). This makes the output much closer to that of
the binary decoder.
Modified:
trunk/libavcodec/mace.c
Modified: trunk/libavcodec/mace.c
==============================================================================
--- trunk/libavcodec/mace.c (original)
+++ trunk/libavcodec/mace.c Sun Sep 7 11:42:57 2008
@@ -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, int
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(AVCodecCon
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(AVCodecCon
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;
}
}
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