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ws_snd: decode to AV_SAMPLE_FMT_U8 instead of S16. 

8-bit unsigned is the native sample format.
This commit is contained in:
Justin Ruggles 2011-09-12 08:55:43 -04:00
parent 4c5e7b27d5
commit 2322ced8da
1 changed files with 24 additions and 23 deletions
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47
libavcodec/ws-snd1.c
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@ -37,13 +37,11 @@ static const int8_t ws_adpcm_4bit[] = {
-9, -8, -6, -5, -4, -3, -2, -1,
0, 1, 2, 3, 4, 5, 6, 8 };
#define CLIP8(a) if(a>127)a=127;if(a<-128)a=-128;
static av_cold int ws_snd_decode_init(AVCodecContext * avctx)
{
// WSSNDContext *c = avctx->priv_data;
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
avctx->sample_fmt = AV_SAMPLE_FMT_U8;
return 0;
}
@ -56,15 +54,14 @@ static int ws_snd_decode_frame(AVCodecContext *avctx,
// WSSNDContext *c = avctx->priv_data;
int in_size, out_size;
int sample = 0;
int sample = 128;
int i;
short *samples = data;
uint8_t *samples = data;
if (!buf_size)
return 0;
out_size = AV_RL16(&buf[0]);
*data_size = out_size * 2;
in_size = AV_RL16(&buf[2]);
buf += 4;
@ -76,9 +73,12 @@ static int ws_snd_decode_frame(AVCodecContext *avctx,
av_log(avctx, AV_LOG_ERROR, "Frame data is larger than input buffer\n");
return -1;
}
*data_size = out_size;
if (in_size == out_size) {
for (i = 0; i < out_size; i++)
*samples++ = (*buf++ - 0x80) << 8;
*samples++ = *buf++;
return buf_size;
}
@ -93,17 +93,17 @@ static int ws_snd_decode_frame(AVCodecContext *avctx,
for (count++; count > 0; count--) {
code = *buf++;
sample += ws_adpcm_2bit[code & 0x3];
CLIP8(sample);
*samples++ = sample << 8;
sample = av_clip_uint8(sample);
*samples++ = sample;
sample += ws_adpcm_2bit[(code >> 2) & 0x3];
CLIP8(sample);
*samples++ = sample << 8;
sample = av_clip_uint8(sample);
*samples++ = sample;
sample += ws_adpcm_2bit[(code >> 4) & 0x3];
CLIP8(sample);
*samples++ = sample << 8;
sample = av_clip_uint8(sample);
*samples++ = sample;
sample += ws_adpcm_2bit[(code >> 6) & 0x3];
CLIP8(sample);
*samples++ = sample << 8;
sample = av_clip_uint8(sample);
*samples++ = sample;
out_size -= 4;
}
break;
@ -111,11 +111,11 @@ static int ws_snd_decode_frame(AVCodecContext *avctx,
for (count++; count > 0; count--) {
code = *buf++;
sample += ws_adpcm_4bit[code & 0xF];
CLIP8(sample);
*samples++ = sample << 8;
sample = av_clip_uint8(sample);
*samples++ = sample;
sample += ws_adpcm_4bit[code >> 4];
CLIP8(sample);
*samples++ = sample << 8;
sample = av_clip_uint8(sample);
*samples++ = sample;
out_size -= 2;
}
break;
@ -125,19 +125,20 @@ static int ws_snd_decode_frame(AVCodecContext *avctx,
t = count;
t <<= 3;
sample += t >> 3;
*samples++ = sample << 8;
sample = av_clip_uint8(sample);
*samples++ = sample;
out_size--;
} else { /* copy */
for (count++; count > 0; count--) {
*samples++ = (*buf++ - 0x80) << 8;
*samples++ = *buf++;
out_size--;
}
sample = buf[-1] - 0x80;
sample = buf[-1];
}
break;
default: /* run */
for(count++; count > 0; count--) {
*samples++ = sample << 8;
*samples++ = sample;
out_size--;
}
}