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shorten: unsigned 8bit support

This commit is contained in:
Paul B Mahol 2012-05-03 10:29:21 +00:00
parent d98b254ab8
commit b7159877b1
1 changed files with 33 additions and 17 deletions
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50
libavcodec/shorten.c
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@ -49,8 +49,12 @@
#define ENERGYSIZE 3
#define BITSHIFTSIZE 2
#define TYPE_S8 1
#define TYPE_U8 2
#define TYPE_S16HL 3
#define TYPE_U16HL 4
#define TYPE_S16LH 5
#define TYPE_U16LH 6
#define NWRAP 3
#define NSKIPSIZE 1
@ -112,7 +116,6 @@ static av_cold int shorten_decode_init(AVCodecContext * avctx)
{
ShortenContext *s = avctx->priv_data;
s->avctx = avctx;
avctx->sample_fmt = AV_SAMPLE_FMT_S16;
avcodec_get_frame_defaults(&s->frame);
avctx->coded_frame = &s->frame;
@ -186,9 +189,13 @@ static int init_offset(ShortenContext *s)
/* initialise offset */
switch (s->internal_ftype)
{
case TYPE_U8:
s->avctx->sample_fmt = AV_SAMPLE_FMT_U8;
mean = 0x80;
break;
case TYPE_S16HL:
case TYPE_S16LH:
mean = 0;
s->avctx->sample_fmt = AV_SAMPLE_FMT_S16;
break;
default:
av_log(s->avctx, AV_LOG_ERROR, "unknown audio type\n");
@ -204,7 +211,7 @@ static int init_offset(ShortenContext *s)
static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header,
int header_size)
{
int len;
int len, bps;
short wave_format;
const uint8_t *end= header + header_size;
@ -247,10 +254,11 @@ static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header,
avctx->sample_rate = bytestream_get_le32(&header);
header += 4; // skip bit rate (represents original uncompressed bit rate)
header += 2; // skip block align (not needed)
avctx->bits_per_coded_sample = bytestream_get_le16(&header);
bps = bytestream_get_le16(&header);
avctx->bits_per_coded_sample = bps;
if (avctx->bits_per_coded_sample != 16) {
av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample\n");
if (bps != 16 && bps != 8) {
av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample: %d\n", bps);
return -1;
}
@ -261,15 +269,6 @@ static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header,
return 0;
}
static void interleave_buffer(int16_t *samples, int nchan, int blocksize,
int32_t **buffer)
{
int i, chan;
for (i=0; i<blocksize; i++)
for (chan=0; chan < nchan; chan++)
*samples++ = av_clip_int16(buffer[chan][i]);
}
static const int fixed_coeffs[3][3] = {
{ 1, 0, 0 },
{ 2, -1, 0 },
@ -578,15 +577,32 @@ static int shorten_decode_frame(AVCodecContext *avctx, void *data,
/* if this is the last channel in the block, output the samples */
s->cur_chan++;
if (s->cur_chan == s->channels) {
uint8_t *samples_u8;
int16_t *samples_s16;
int chan;
/* get output buffer */
s->frame.nb_samples = s->blocksize;
if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
samples_u8 = (uint8_t *)s->frame.data[0];
samples_s16 = (int16_t *)s->frame.data[0];
/* interleave output */
interleave_buffer((int16_t *)s->frame.data[0], s->channels,
s->blocksize, s->decoded);
for (i = 0; i < s->blocksize; i++) {
for (chan = 0; chan < s->channels; chan++) {
switch (s->internal_ftype) {
case TYPE_U8:
*samples_u8++ = av_clip_uint8(s->decoded[chan][i]);
break;
case TYPE_S16HL:
case TYPE_S16LH:
*samples_s16++ = av_clip_int16(s->decoded[chan][i]);
break;
}
}
}
*got_frame_ptr = 1;
*(AVFrame *)data = s->frame;