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Code Issues Releases Activity

xan: remove a trivially true if().

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This function used to be shared with the xxan decoder, but that is not
true anymore.
This commit is contained in:
Anton Khirnov 2012-11-16 06:40:14 +01:00
parent 99e36ddd3e
commit 51648da4dc
1 changed files with 48 additions and 49 deletions
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97
libavcodec/xan.c
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@ -499,62 +499,61 @@ static int xan_decode_frame(AVCodecContext *avctx,
const uint8_t *buf = avpkt->data;
int ret, buf_size = avpkt->size;
XanContext *s = avctx->priv_data;
const uint8_t *buf_end = buf + buf_size;
int tag = 0;
if (avctx->codec->id == AV_CODEC_ID_XAN_WC3) {
const uint8_t *buf_end = buf + buf_size;
int tag = 0;
while (buf_end - buf > 8 && tag != VGA__TAG) {
unsigned *tmpptr;
uint32_t new_pal;
int size;
int i;
tag = bytestream_get_le32(&buf);
size = bytestream_get_be32(&buf);
size = FFMIN(size, buf_end - buf);
switch (tag) {
case PALT_TAG:
if (size < PALETTE_SIZE)
return AVERROR_INVALIDDATA;
if (s->palettes_count >= PALETTES_MAX)
return AVERROR_INVALIDDATA;
tmpptr = av_realloc(s->palettes,
(s->palettes_count + 1) * AVPALETTE_SIZE);
if (!tmpptr)
return AVERROR(ENOMEM);
s->palettes = tmpptr;
tmpptr += s->palettes_count * AVPALETTE_COUNT;
for (i = 0; i < PALETTE_COUNT; i++) {
while (buf_end - buf > 8 && tag != VGA__TAG) {
unsigned *tmpptr;
uint32_t new_pal;
int size;
int i;
tag = bytestream_get_le32(&buf);
size = bytestream_get_be32(&buf);
size = FFMIN(size, buf_end - buf);
switch (tag) {
case PALT_TAG:
if (size < PALETTE_SIZE)
return AVERROR_INVALIDDATA;
if (s->palettes_count >= PALETTES_MAX)
return AVERROR_INVALIDDATA;
tmpptr = av_realloc(s->palettes,
(s->palettes_count + 1) * AVPALETTE_SIZE);
if (!tmpptr)
return AVERROR(ENOMEM);
s->palettes = tmpptr;
tmpptr += s->palettes_count * AVPALETTE_COUNT;
for (i = 0; i < PALETTE_COUNT; i++) {
#if RUNTIME_GAMMA
int r = gamma_corr(*buf++);
int g = gamma_corr(*buf++);
int b = gamma_corr(*buf++);
int r = gamma_corr(*buf++);
int g = gamma_corr(*buf++);
int b = gamma_corr(*buf++);
#else
int r = gamma_lookup[*buf++];
int g = gamma_lookup[*buf++];
int b = gamma_lookup[*buf++];
int r = gamma_lookup[*buf++];
int g = gamma_lookup[*buf++];
int b = gamma_lookup[*buf++];
#endif
*tmpptr++ = (r << 16) | (g << 8) | b;
}
s->palettes_count++;
break;
case SHOT_TAG:
if (size < 4)
return AVERROR_INVALIDDATA;
new_pal = bytestream_get_le32(&buf);
if (new_pal < s->palettes_count) {
s->cur_palette = new_pal;
} else
av_log(avctx, AV_LOG_ERROR, "Invalid palette selected\n");
break;
case VGA__TAG:
break;
default:
buf += size;
break;
*tmpptr++ = (r << 16) | (g << 8) | b;
}
s->palettes_count++;
break;
case SHOT_TAG:
if (size < 4)
return AVERROR_INVALIDDATA;
new_pal = bytestream_get_le32(&buf);
if (new_pal < s->palettes_count) {
s->cur_palette = new_pal;
} else
av_log(avctx, AV_LOG_ERROR, "Invalid palette selected\n");
break;
case VGA__TAG:
break;
default:
buf += size;
break;
}
buf_size = buf_end - buf;
}
buf_size = buf_end - buf;
if (s->palettes_count <= 0) {
av_log(s->avctx, AV_LOG_ERROR, "No palette found\n");
return AVERROR_INVALIDDATA;