static int microdvd_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt) { AVSubtitle *sub = data; AVBPrint new_line; char *line = avpkt->data; char *end = avpkt->data + avpkt->size; struct microdvd_tag tags[sizeof(MICRODVD_TAGS) - 1] = {{0}}; if (avpkt->size <= 0) return avpkt->size; av_bprint_init(&new_line, 0, 2048); // subtitle content while (line < end && *line) { // parse MicroDVD tags, and open them in ASS line = microdvd_load_tags(tags, line); microdvd_open_tags(&new_line, tags); // simple copy until EOL or forced carriage return while (line < end && *line && *line != '|') { av_bprint_chars(&new_line, *line, 1); line++; } // line split if (line < end && *line == '|') { microdvd_close_no_persistent_tags(&new_line, tags); av_bprintf(&new_line, "\\N"); line++; } } if (new_line.len) { int ret; int64_t start = avpkt->pts; int64_t duration = avpkt->duration; int ts_start = av_rescale_q(start, avctx->time_base, (AVRational){1,100}); int ts_duration = duration != -1 ? av_rescale_q(duration, avctx->time_base, (AVRational){1,100}) : -1; ret = ff_ass_add_rect_bprint(sub, &new_line, ts_start, ts_duration); av_bprint_finalize(&new_line, NULL); if (ret < 0) return ret; } *got_sub_ptr = sub->num_rects > 0; return avpkt->size; }
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; const char *ptr = avpkt->data; const char *end; 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. */ end = ptr + FFMIN(2 + AV_RB16(ptr), 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}); // Note that the spec recommends lines be no longer than 2048 characters. av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); text_to_ass(&buf, ptr, end); 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; }
static int sami_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt) { AVSubtitle *sub = data; const char *ptr = avpkt->data; SAMIContext *sami = avctx->priv_data; if (ptr && avpkt->size > 0 && !sami_paragraph_to_ass(avctx, ptr)) { int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100}); int ts_duration = avpkt->duration != -1 ? av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1; int ret = ff_ass_add_rect_bprint(sub, &sami->full, ts_start, ts_duration); if (ret < 0) return ret; } *got_sub_ptr = sub->num_rects > 0; return avpkt->size; }
static int subviewer_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt) { int ret = 0; AVSubtitle *sub = data; const char *ptr = avpkt->data; AVBPrint buf; av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); // note: no need to rescale pts & duration since they are in the same // timebase as ASS (1/100) if (ptr && avpkt->size > 0 && !subviewer_event_to_ass(&buf, ptr)) ret = ff_ass_add_rect_bprint(sub, &buf, avpkt->pts, avpkt->duration); av_bprint_finalize(&buf, NULL); if (ret < 0) return ret; *got_sub_ptr = sub->num_rects > 0; return avpkt->size; }
static int webvtt_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt) { int ret = 0; AVSubtitle *sub = data; const char *ptr = avpkt->data; AVBPrint buf; av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); if (ptr && avpkt->size > 0 && !webvtt_event_to_ass(&buf, ptr)) { int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100}); int ts_duration = avpkt->duration != -1 ? av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1; ret = ff_ass_add_rect_bprint(sub, &buf, ts_start, ts_duration, 0); } av_bprint_finalize(&buf, NULL); if (ret < 0) return ret; *got_sub_ptr = sub->num_rects > 0; return avpkt->size; }
static int srt_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt) { AVSubtitle *sub = data; AVBPrint buffer; int ts_start, ts_end, x1 = -1, y1 = -1, x2 = -1, y2 = -1; int size, ret; const uint8_t *p = av_packet_get_side_data(avpkt, AV_PKT_DATA_SUBTITLE_POSITION, &size); if (p && size == 16) { x1 = AV_RL32(p ); y1 = AV_RL32(p + 4); x2 = AV_RL32(p + 8); y2 = AV_RL32(p + 12); } if (avpkt->size <= 0) return avpkt->size; av_bprint_init(&buffer, 0, AV_BPRINT_SIZE_UNLIMITED); // TODO: reindent // Do final divide-by-10 outside rescale to force rounding down. 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}); srt_to_ass(avctx, &buffer, avpkt->data, x1, y1, x2, y2); ret = ff_ass_add_rect_bprint(sub, &buffer, ts_start, ts_end-ts_start); av_bprint_finalize(&buffer, NULL); if (ret < 0) return ret; *got_sub_ptr = sub->num_rects > 0; return avpkt->size; }
static int mov_text_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr, AVPacket *avpkt) { AVSubtitle *sub = data; MovTextContext *m = avctx->priv_data; int ret, ts_start, ts_end; AVBPrint buf; char *ptr = avpkt->data; char *end; int text_length, tsmb_type, ret_tsmb; uint64_t tsmb_size; const uint8_t *tsmb; 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; m->tracksize = 2 + text_length; m->style_entries = 0; m->box_flags = 0; m->count_s = 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 (m->tracksize + 8 <= avpkt->size) { // A box is a minimum of 8 bytes. tsmb = ptr + m->tracksize - 2; tsmb_size = AV_RB32(tsmb); tsmb += 4; tsmb_type = AV_RB32(tsmb); tsmb += 4; if (tsmb_size == 1) { if (m->tracksize + 16 > avpkt->size) break; tsmb_size = AV_RB64(tsmb); tsmb += 8; m->size_var = 16; } else m->size_var = 8; //size_var is equal to 8 or 16 depending on the size of box if (m->tracksize + tsmb_size > avpkt->size) break; for (size_t i = 0; i < box_count; i++) { if (tsmb_type == box_types[i].type) { if (m->tracksize + m->size_var + box_types[i].base_size > avpkt->size) break; ret_tsmb = box_types[i].decode(tsmb, m, avpkt); if (ret_tsmb == -1) break; } } m->tracksize = m->tracksize + tsmb_size; } text_to_ass(&buf, ptr, end, m); mov_text_cleanup(m); } else text_to_ass(&buf, ptr, end, m); 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; }
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; uint64_t tsmb_size, tracksize; StyleBox **s = {0, }; StyleBox *s_temp; const uint8_t *tsmb; int count, i, size_var; 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; tracksize = 2 + text_length; // 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 (tracksize + 8 <= avpkt->size) { // A box is a minimum of 8 bytes. tsmb = ptr + tracksize - 2; tsmb_size = AV_RB32(tsmb); tsmb += 4; tsmb_type = AV_RB32(tsmb); tsmb += 4; if (tsmb_size == 1) { if (tracksize + 16 > avpkt->size) break; tsmb_size = AV_RB64(tsmb); tsmb += 8; size_var = 18; } else size_var = 10; //size_var is equal to 10 or 18 depending on the size of box if (tracksize + tsmb_size > avpkt->size) break; if (tsmb_type == MKBETAG('s','t','y','l')) { if (tracksize + size_var > avpkt->size) break; style_entries = AV_RB16(tsmb); tsmb += 2; // A single style record is of length 12 bytes. if (tracksize + size_var + style_entries * 12 > avpkt->size) break; count = 0; for(i = 0; i < style_entries; i++) { s_temp = av_malloc(sizeof(*s_temp)); if (!s_temp) goto error; s_temp->style_start = AV_RB16(tsmb); tsmb += 2; s_temp->style_end = AV_RB16(tsmb); tsmb += 2; // fontID = AV_RB16(tsmb); tsmb += 2; s_temp->style_flag = AV_RB8(tsmb); av_dynarray_add(&s, &count, s_temp); if(!s) goto error; //fontsize=AV_RB8(tsmb); tsmb += 2; // text-color-rgba tsmb += 4; } text_to_ass(&buf, ptr, end, s, style_entries); for(i = 0; i < count; i++) { av_freep(&s[i]); } av_freep(&s); } tracksize = tracksize + tsmb_size; } } else text_to_ass(&buf, ptr, end, NULL, 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; error: for(i = 0; i < count; i++) { av_freep(&s[i]); } av_freep(&s); if (s_temp) av_freep(&s_temp); av_bprint_finalize(&buf, NULL); return AVERROR(ENOMEM); }