static int mov_text_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt) { AVSubtitle *sub = data; int ret, ts_start, ts_end; AVBPrint buf; char *ptr = avpkt->data; char *end; //char *ptr_temp; int text_length, tsmb_type, style_entries, tsmb_size; int **style_start = {0,}; int **style_end = {0,}; int **style_flags = {0,}; const uint8_t *tsmb; int index, i; int *flag; int *style_pos; if (!ptr || avpkt->size < 2) return AVERROR_INVALIDDATA; /* * A packet of size two with value zero is an empty subtitle * used to mark the end of the previous non-empty subtitle. * We can just drop them here as we have duration information * already. If the value is non-zero, then it's technically a * bad packet. */ if (avpkt->size == 2) return AV_RB16(ptr) == 0 ? 0 : AVERROR_INVALIDDATA; /* * The first two bytes of the packet are the length of the text string * In complex cases, there are style descriptors appended to the string * so we can't just assume the packet size is the string size. */ text_length = AV_RB16(ptr); end = ptr + FFMIN(2 + text_length, avpkt->size); ptr += 2; ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100}); ts_end = av_rescale_q(avpkt->pts + avpkt->duration, avctx->time_base, (AVRational){1,100}); tsmb_size = 0; // Note that the spec recommends lines be no longer than 2048 characters. av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); if (text_length + 2 != avpkt->size) { while (text_length + 2 + tsmb_size < avpkt->size) { tsmb = ptr + text_length + tsmb_size; tsmb_size = AV_RB32(tsmb); tsmb += 4; tsmb_type = AV_RB32(tsmb); tsmb += 4; if (tsmb_type == MKBETAG('s','t','y','l')) { style_entries = AV_RB16(tsmb); tsmb += 2; for(i = 0; i < style_entries; i++) { style_pos = av_malloc(4); *style_pos = AV_RB16(tsmb); index = i; av_dynarray_add(&style_start, &index, style_pos); tsmb += 2; style_pos = av_malloc(4); *style_pos = AV_RB16(tsmb); index = i; av_dynarray_add(&style_end, &index, style_pos); tsmb += 2; // fontID = AV_RB16(tsmb); tsmb += 2; flag = av_malloc(4); *flag = AV_RB8(tsmb); index = i; av_dynarray_add(&style_flags, &index, flag); //fontsize=AV_RB8(tsmb); tsmb += 2; // text-color-rgba tsmb += 4; } text_to_ass(&buf, ptr, end, style_start, style_end, style_flags, style_entries); av_freep(&style_start); av_freep(&style_end); av_freep(&style_flags); } } } else text_to_ass(&buf, ptr, end, NULL, NULL, 0, 0); ret = ff_ass_add_rect_bprint(sub, &buf, ts_start, ts_end - ts_start); av_bprint_finalize(&buf, NULL); if (ret < 0) return ret; *got_sub_ptr = sub->num_rects > 0; return avpkt->size; }