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dpcm: output AV_SAMPLE_FMT_U8 for Sol DPCM subcodecs 1 and 2.

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Uses the native sample format for the codec instead of left-shifting all
samples by 8.
This commit is contained in:
Justin Ruggles 2011-09-11 12:04:46 -04:00
parent 76db17dc7d
commit 04b24cf94b
1 changed files with 16 additions and 13 deletions
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29
libavcodec/dpcm.c
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@ -43,7 +43,7 @@
typedef struct DPCMContext {
int channels;
short roq_square_array[256];
long sample[2];//for SOL_DPCM
int sample[2]; ///< previous sample (for SOL_DPCM)
const int *sol_table;//for SOL_DPCM
} DPCMContext;
@ -155,7 +155,11 @@ static av_cold int dpcm_decode_init(AVCodecContext *avctx)
break;
}
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
if (avctx->codec->id == CODEC_ID_SOL_DPCM && avctx->codec_tag != 3)
avctx->sample_fmt = AV_SAMPLE_FMT_U8;
else
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
return 0;
}
@ -285,18 +289,17 @@ static int dpcm_decode_frame(AVCodecContext *avctx,
case CODEC_ID_SOL_DPCM:
in = 0;
if (avctx->codec_tag != 3) {
uint8_t *output_samples_u8 = data;
while (in < buf_size) {
int n1, n2;
n1 = (buf[in] >> 4) & 0xF;
n2 = buf[in++] & 0xF;
s->sample[0] += s->sol_table[n1];
if (s->sample[0] < 0) s->sample[0] = 0;
if (s->sample[0] > 255) s->sample[0] = 255;
*output_samples++ = (s->sample[0] - 128) << 8;
s->sample[stereo] += s->sol_table[n2];
if (s->sample[stereo] < 0) s->sample[stereo] = 0;
if (s->sample[stereo] > 255) s->sample[stereo] = 255;
*output_samples++ = (s->sample[stereo] - 128) << 8;
uint8_t n = buf[in++];
s->sample[0] += s->sol_table[n >> 4];
s->sample[0] = av_clip_uint8(s->sample[0]);
*output_samples_u8++ = s->sample[0];
s->sample[stereo] += s->sol_table[n & 0x0F];
s->sample[stereo] = av_clip_uint8(s->sample[stereo]);
*output_samples_u8++ = s->sample[stereo];
}
} else {
while (in < buf_size) {