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avcodec/ylc: Avoid code duplication when creating and freeing VLCs

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Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2021-03-08 16:05:26 +01:00
parent 50645e5044
commit d7d33c0376
1 changed files with 7 additions and 16 deletions
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23
libavcodec/ylc.c
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@ -38,7 +38,7 @@
typedef struct YLCContext {
VLC vlc[4];
uint32_t table[1024];
uint32_t table[256];
uint8_t *buffer;
int buffer_size;
BswapDSPContext bdsp;
@ -324,25 +324,18 @@ static int decode_frame(AVCodecContext *avctx,
if ((ret = init_get_bits8(&gb, s->buffer, boffset - toffset)) < 0)
return ret;
for (x = 0; x < 1024; x++) {
for (int i = 0; i < 4; i++) {
for (x = 0; x < 256; x++) {
unsigned len = get_unary(&gb, 1, 31);
uint32_t val = ((1U << len) - 1) + get_bits_long(&gb, len);
s->table[x] = val;
}
ret = build_vlc(avctx, &s->vlc[0], &s->table[0 ]);
if (ret < 0)
return ret;
ret = build_vlc(avctx, &s->vlc[1], &s->table[256]);
if (ret < 0)
return ret;
ret = build_vlc(avctx, &s->vlc[2], &s->table[512]);
if (ret < 0)
return ret;
ret = build_vlc(avctx, &s->vlc[3], &s->table[768]);
ret = build_vlc(avctx, &s->vlc[i], s->table);
if (ret < 0)
return ret;
}
memcpy(s->buffer, avpkt->data + boffset, avpkt->size - boffset);
memset(s->buffer + avpkt->size - boffset, 0, AV_INPUT_BUFFER_PADDING_SIZE);
@ -451,10 +444,8 @@ static av_cold int decode_end(AVCodecContext *avctx)
{
YLCContext *s = avctx->priv_data;
ff_free_vlc(&s->vlc[0]);
ff_free_vlc(&s->vlc[1]);
ff_free_vlc(&s->vlc[2]);
ff_free_vlc(&s->vlc[3]);
for (int i = 0; i < FF_ARRAY_ELEMS(s->vlc); i++)
ff_free_vlc(&s->vlc[i]);
av_freep(&s->buffer);
s->buffer_size = 0;