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avcodec/xsubdec: Use dedicated pointer for AVSubtitleRect 

Improves readability and slightly reduces codesize.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2021-12-10 22:54:45 +01:00
parent 077167fab9
commit 6e02ca35e5
1 changed files with 18 additions and 17 deletions
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35
libavcodec/xsubdec.c
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@ -52,6 +52,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr,
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AVSubtitle *sub = data;
AVSubtitleRect *rect;
const uint8_t *buf_end = buf + buf_size;
uint8_t *bitmap;
int w, h, x, y, i, ret;
@ -100,40 +101,40 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr,
if (!sub->rects)
return AVERROR(ENOMEM);
sub->rects[0] = av_mallocz(sizeof(*sub->rects[0]));
sub->rects[0] = rect = av_mallocz(sizeof(*sub->rects[0]));
if (!sub->rects[0])
return AVERROR(ENOMEM);
sub->num_rects = 1;
sub->rects[0]->x = x; sub->rects[0]->y = y;
sub->rects[0]->w = w; sub->rects[0]->h = h;
sub->rects[0]->type = SUBTITLE_BITMAP;
sub->rects[0]->linesize[0] = w;
sub->rects[0]->data[0] = av_malloc(w * h);
sub->rects[0]->nb_colors = 4;
sub->rects[0]->data[1] = av_mallocz(AVPALETTE_SIZE);
if (!sub->rects[0]->data[0] || !sub->rects[0]->data[1])
rect->x = x; rect->y = y;
rect->w = w; rect->h = h;
rect->type = SUBTITLE_BITMAP;
rect->linesize[0] = w;
rect->data[0] = av_malloc(w * h);
rect->nb_colors = 4;
rect->data[1] = av_mallocz(AVPALETTE_SIZE);
if (!rect->data[0] || !rect->data[1])
return AVERROR(ENOMEM);
// read palette
for (i = 0; i < sub->rects[0]->nb_colors; i++)
((uint32_t*)sub->rects[0]->data[1])[i] = bytestream_get_be24(&buf);
for (i = 0; i < rect->nb_colors; i++)
((uint32_t*)rect->data[1])[i] = bytestream_get_be24(&buf);
if (!has_alpha) {
// make all except background (first entry) non-transparent
for (i = 1; i < sub->rects[0]->nb_colors; i++)
((uint32_t *)sub->rects[0]->data[1])[i] |= 0xff000000;
for (i = 1; i < rect->nb_colors; i++)
((uint32_t *)rect->data[1])[i] |= 0xff000000;
} else {
for (i = 0; i < sub->rects[0]->nb_colors; i++)
((uint32_t *)sub->rects[0]->data[1])[i] |= (unsigned)*buf++ << 24;
for (i = 0; i < rect->nb_colors; i++)
((uint32_t *)rect->data[1])[i] |= (unsigned)*buf++ << 24;
}
// process RLE-compressed data
if ((ret = init_get_bits8(&gb, buf, buf_end - buf)) < 0)
return ret;
bitmap = sub->rects[0]->data[0];
bitmap = rect->data[0];
for (y = 0; y < h; y++) {
// interlaced: do odd lines
if (y == (h + 1) / 2) bitmap = sub->rects[0]->data[0] + w;
if (y == (h + 1) / 2) bitmap = rect->data[0] + w;
for (x = 0; x < w; ) {
int log2 = ff_log2_tab[show_bits(&gb, 8)];
int run = get_bits(&gb, 14 - 4 * (log2 >> 1));