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pcm: reduce pointer type casting

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Making 'samples' a pointer to uint8_t simplifies the DECODE
macro and reduces the amount of type casting overall.

This also fixes some signed overflows on left shift.

Signed-off-by: Mans Rullgard <mans@mansr.com>
pull/2/head
Mans Rullgard 13 years ago
parent f59bb3d8f3
commit b45eb9d619
1 changed files with 37 additions and 40 deletions
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  1. 77
      libavcodec/pcm.c

77
libavcodec/pcm.c
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@ -236,7 +236,7 @@ static av_cold int pcm_decode_init(AVCodecContext * avctx)
/**
* Read PCM samples macro
* @param type Datatype of native machine format
* @param size Data size of native machine format
* @param endian bytestream_get_xxx() endian suffix
* @param src Source pointer (variable name)
* @param dst Destination pointer (variable name)
@ -244,13 +244,12 @@ static av_cold int pcm_decode_init(AVCodecContext * avctx)
* @param shift Bitshift (bits)
* @param offset Sample value offset
*/
#define DECODE(type, endian, src, dst, n, shift, offset) \
dst_##type = (type*)dst; \
#define DECODE(size, endian, src, dst, n, shift, offset) \
for(;n>0;n--) { \
register type v = bytestream_get_##endian(&src); \
*dst_##type++ = (v - offset) << shift; \
} \
dst = (short*)dst_##type;
uint##size##_t v = bytestream_get_##endian(&src); \
AV_WN##size##A(dst, (v - offset) << shift); \
dst += size / 8; \
}
static int pcm_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
@ -260,14 +259,9 @@ static int pcm_decode_frame(AVCodecContext *avctx,
int buf_size = avpkt->size;
PCMDecode *s = avctx->priv_data;
int sample_size, c, n, i;
short *samples;
uint8_t *samples;
const uint8_t *src, *src8, *src2[MAX_CHANNELS];
uint8_t *dstu8;
int16_t *dst_int16_t;
int32_t *dst_int32_t;
int64_t *dst_int64_t;
uint16_t *dst_uint16_t;
uint32_t *dst_uint32_t;
samples = data;
src = buf;
@ -314,29 +308,30 @@ static int pcm_decode_frame(AVCodecContext *avctx,
switch(avctx->codec->id) {
case CODEC_ID_PCM_U32LE:
DECODE(uint32_t, le32, src, samples, n, 0, 0x80000000)
DECODE(32, le32, src, samples, n, 0, 0x80000000)
break;
case CODEC_ID_PCM_U32BE:
DECODE(uint32_t, be32, src, samples, n, 0, 0x80000000)
DECODE(32, be32, src, samples, n, 0, 0x80000000)
break;
case CODEC_ID_PCM_S24LE:
DECODE(int32_t, le24, src, samples, n, 8, 0)
DECODE(32, le24, src, samples, n, 8, 0)
break;
case CODEC_ID_PCM_S24BE:
DECODE(int32_t, be24, src, samples, n, 8, 0)
DECODE(32, be24, src, samples, n, 8, 0)
break;
case CODEC_ID_PCM_U24LE:
DECODE(uint32_t, le24, src, samples, n, 8, 0x800000)
DECODE(32, le24, src, samples, n, 8, 0x800000)
break;
case CODEC_ID_PCM_U24BE:
DECODE(uint32_t, be24, src, samples, n, 8, 0x800000)
DECODE(32, be24, src, samples, n, 8, 0x800000)
break;
case CODEC_ID_PCM_S24DAUD:
for(;n>0;n--) {
uint32_t v = bytestream_get_be24(&src);
v >>= 4; // sync flags are here
*samples++ = av_reverse[(v >> 8) & 0xff] +
(av_reverse[v & 0xff] << 8);
AV_WN16A(samples, av_reverse[(v >> 8) & 0xff] +
(av_reverse[v & 0xff] << 8));
samples += 2;
}
break;
case CODEC_ID_PCM_S16LE_PLANAR:
@ -344,33 +339,33 @@ static int pcm_decode_frame(AVCodecContext *avctx,
for(c=0;c<avctx->channels;c++)
src2[c] = &src[c*n*2];
for(;n>0;n--)
for(c=0;c<avctx->channels;c++)
*samples++ = bytestream_get_le16(&src2[c]);
for(c=0;c<avctx->channels;c++) {
AV_WN16A(samples, bytestream_get_le16(&src2[c]));
samples += 2;
}
src = src2[avctx->channels-1];
break;
case CODEC_ID_PCM_U16LE:
DECODE(uint16_t, le16, src, samples, n, 0, 0x8000)
DECODE(16, le16, src, samples, n, 0, 0x8000)
break;
case CODEC_ID_PCM_U16BE:
DECODE(uint16_t, be16, src, samples, n, 0, 0x8000)
DECODE(16, be16, src, samples, n, 0, 0x8000)
break;
case CODEC_ID_PCM_S8:
dstu8= (uint8_t*)samples;
for(;n>0;n--) {
*dstu8++ = *src++ + 128;
*samples++ = *src++ + 128;
}
samples= (short*)dstu8;
break;
#if HAVE_BIGENDIAN
case CODEC_ID_PCM_F64LE:
DECODE(int64_t, le64, src, samples, n, 0, 0)
DECODE(64, le64, src, samples, n, 0, 0)
break;
case CODEC_ID_PCM_S32LE:
case CODEC_ID_PCM_F32LE:
DECODE(int32_t, le32, src, samples, n, 0, 0)
DECODE(32, le32, src, samples, n, 0, 0)
break;
case CODEC_ID_PCM_S16LE:
DECODE(int16_t, le16, src, samples, n, 0, 0)
DECODE(16, le16, src, samples, n, 0, 0)
break;
case CODEC_ID_PCM_F64BE:
case CODEC_ID_PCM_F32BE:
@ -378,14 +373,14 @@ static int pcm_decode_frame(AVCodecContext *avctx,
case CODEC_ID_PCM_S16BE:
#else
case CODEC_ID_PCM_F64BE:
DECODE(int64_t, be64, src, samples, n, 0, 0)
DECODE(64, be64, src, samples, n, 0, 0)
break;
case CODEC_ID_PCM_F32BE:
case CODEC_ID_PCM_S32BE:
DECODE(int32_t, be32, src, samples, n, 0, 0)
DECODE(32, be32, src, samples, n, 0, 0)
break;
case CODEC_ID_PCM_S16BE:
DECODE(int16_t, be16, src, samples, n, 0, 0)
DECODE(16, be16, src, samples, n, 0, 0)
break;
case CODEC_ID_PCM_F64LE:
case CODEC_ID_PCM_F32LE:
@ -395,20 +390,22 @@ static int pcm_decode_frame(AVCodecContext *avctx,
case CODEC_ID_PCM_U8:
memcpy(samples, src, n*sample_size);
src += n*sample_size;
samples = (short*)((uint8_t*)data + n*sample_size);
samples += n * sample_size;
break;
case CODEC_ID_PCM_ZORK:
for(;n>0;n--) {
int x= *src++;
if(x&128) x-= 128;
else x = -x;
*samples++ = x << 8;
AV_WN16A(samples, x << 8);
samples += 2;
}
break;
case CODEC_ID_PCM_ALAW:
case CODEC_ID_PCM_MULAW:
for(;n>0;n--) {
*samples++ = s->table[*src++];
AV_WN16A(samples, s->table[*src++]);
samples += 2;
}
break;
case CODEC_ID_PCM_DVD:
@ -441,7 +438,7 @@ static int pcm_decode_frame(AVCodecContext *avctx,
av_log(avctx, AV_LOG_ERROR, "PCM DVD unsupported sample depth\n");
return -1;
}
samples = (short *) dst_int32_t;
samples = (uint8_t *) dst_int32_t;
break;
case CODEC_ID_PCM_LXF:
dst_int32_t = data;
@ -461,12 +458,12 @@ static int pcm_decode_frame(AVCodecContext *avctx,
}
}
src += n * avctx->channels * 5;
samples = (short *) dst_int32_t;
samples = (uint8_t *) dst_int32_t;
break;
default:
return -1;
}
*data_size = (uint8_t *)samples - (uint8_t *)data;
*data_size = samples - (uint8_t *)data;
return src - buf;
}

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