static int mov_rewrite_dvd_sub_extradata(AVStream *st) { char pal_s[256]; char buf[256]; int pal_s_pos = 0; uint8_t *src = st->codec->extradata; int i; if (st->codec->extradata_size != 64) return 0; for (i = 0; i < 16; i++) { uint32_t yuv = AV_RB32(src + i * 4); uint32_t rgba = yuv_to_rgba(yuv); snprintf(pal_s + pal_s_pos, sizeof(pal_s) - pal_s_pos, "%06x%s", rgba, i != 15 ? ", " : ""); pal_s_pos = strlen(pal_s); if (pal_s_pos >= sizeof(pal_s)) return 0; } snprintf(buf, sizeof(buf), "size: %dx%d\npalette: %s\n", st->codec->width, st->codec->height, pal_s); av_freep(&st->codec->extradata); st->codec->extradata_size = 0; st->codec->extradata = av_mallocz(strlen(buf) + FF_INPUT_BUFFER_PADDING_SIZE); if (!st->codec->extradata) return AVERROR(ENOMEM); st->codec->extradata_size = strlen(buf); memcpy(st->codec->extradata, buf, st->codec->extradata_size); return 0; }