text_to_bifs.c

一个用于智能手机的多媒体库适合S60 WinCE的跨平台开发库

		default:
			ptr = szLine;
			/*FIXME - other styles posssibles ??*/
			while (1) {
				if (!strnicmp(ptr, "<i>", 3)) {
					italic = 1;
					ptr += 3;
				}
				else if (!strnicmp(ptr, "<u>", 3)) {
					underlined = 1;
					ptr += 3;
				}
				else if (!strnicmp(ptr, "<b>", 3)) {
					bold = 1;
					ptr += 3;
				}
				else
					break;
			}
			/*if style remove end markers*/
			while ((strlen(ptr)>4) && (ptr[strlen(ptr) - 4] == '<') && (ptr[strlen(ptr) - 1] == '>')) {
				ptr[strlen(ptr) - 4] = 0;
			}

			if (!com) {
				com = gf_sg_command_new(ctx->scene_graph, GF_SG_FIELD_REPLACE);
				com->node = text;
				gf_node_register(text, NULL);
				inf = gf_sg_command_field_new(com);
				inf->fieldIndex = string.fieldIndex;
				inf->fieldType = string.fieldType;
				inf->field_ptr = gf_sg_vrml_field_pointer_new(string.fieldType);
				gf_list_add(au->commands, com);
			}
			assert(inf);
			gf_sg_vrml_mf_append(inf->field_ptr, GF_SG_VRML_MFSTRING, (void **) &sfstr);
			len = 0;
			for (i=0; i<strlen(ptr); i++) {
				/*FIXME - UTF16 support !!*/
				if (ptr[i] & 0x80) {
					/*non UTF8 (likely some win-CP)*/
					if ((ptr[i+1] & 0xc0) != 0x80) {
						szText[len] = 0xc0 | ( (ptr[i] >> 6) & 0x3 );
						len++;
						ptr[i] &= 0xbf;
					} 
					/*we only handle UTF8 chars on 2 bytes (eg first byte is 0b110xxxxx)*/
					else if ((ptr[i] & 0xe0) == 0xc0) {
						szText[len] = ptr[i];
						len++;
						i++;
					}
				}
				szText[len] = ptr[i];
				len++;
			}
			szText[len] = 0;
			sfstr->buffer = strdup(szText);
			break;
		}
	}

exit:
	if (e) gf_sm_stream_del(ctx, srt);
	fclose(srt_in);
	return e;
}

static GF_Err gf_text_import_sub_bifs(GF_SceneManager *ctx, GF_ESD *src, GF_MuxInfo *mux)
{
	GF_Err e;
	GF_Node *text, *font;
	GF_StreamContext *srt;
	FILE *sub_in;
	GF_FieldInfo string, style;
	u32 start, end, line, i, j, k, len;
	GF_AUContext *au;
	GF_Command *com;
	SFString *sfstr;
	GF_CommandField *inf;
	Bool first_samp;
	Double fps;
	char szLine[2048], szTime[30], szText[2048];
	GF_StreamContext *sc = NULL;

	if (!ctx->scene_graph) {
		GF_LOG(GF_LOG_ERROR, GF_LOG_PARSER, ("[sub->bifs] base scene not assigned\n"));
		return GF_BAD_PARAM;
	}
	i=0;
	while ((sc = (GF_StreamContext*)gf_list_enum(ctx->streams, &i))) {
		if (sc->streamType==GF_STREAM_SCENE) break;
		sc = NULL;
	}

	if (!sc) {
		GF_LOG(GF_LOG_ERROR, GF_LOG_PARSER, ("[sub->bifs] cannot locate base scene\n"));
		return GF_BAD_PARAM;
	}
	if (!mux->textNode) {
		GF_LOG(GF_LOG_ERROR, GF_LOG_PARSER, ("[sub->bifs] target text node unspecified\n"));
		return GF_BAD_PARAM;
	}
	text = gf_sg_find_node_by_name(ctx->scene_graph, mux->textNode);
	if (!text) {
		GF_LOG(GF_LOG_ERROR, GF_LOG_PARSER, ("[sub->bifs] cannot find target text node %s\n", mux->textNode));
		return GF_BAD_PARAM;
	}
	if (gf_node_get_field_by_name(text, "string", &string) != GF_OK) {
		GF_LOG(GF_LOG_ERROR, GF_LOG_PARSER, ("[sub->bifs] target text node %s doesn't look like text\n", mux->textNode));
		return GF_BAD_PARAM;
	}

	font = NULL;
	if (mux->fontNode) {
		font = gf_sg_find_node_by_name(ctx->scene_graph, mux->fontNode);
		if (!font) {
			GF_LOG(GF_LOG_ERROR, GF_LOG_PARSER, ("[sub->bifs] cannot find target font node %s\n", mux->fontNode));
			return GF_BAD_PARAM;
		}
		if (gf_node_get_field_by_name(font, "style", &style) != GF_OK) {
			GF_LOG(GF_LOG_ERROR, GF_LOG_PARSER, ("[sub->bifs] target font node %s doesn't look like font\n", mux->fontNode));
			return GF_BAD_PARAM;
		}
	}

	sub_in = fopen(mux->file_name, "rt");
	if (!sub_in) {
		GF_LOG(GF_LOG_ERROR, GF_LOG_PARSER, ("[sub->bifs] cannot open input file %s\n", mux->file_name));
		return GF_URL_ERROR;
	}

	srt = gf_sm_stream_new(ctx, src->ESID, GF_STREAM_SCENE, 1);
	if (!srt) return GF_OUT_OF_MEM;

	if (!src->slConfig) src->slConfig = (GF_SLConfig *) gf_odf_desc_new(GF_ODF_SLC_TAG);
	src->slConfig->timestampResolution = 1000;
	if (!src->decoderConfig) src->decoderConfig = (GF_DecoderConfig *) gf_odf_desc_new(GF_ODF_DCD_TAG);
	src->decoderConfig->streamType = GF_STREAM_SCENE;
	src->decoderConfig->objectTypeIndication = 1;

	e = GF_OK;
	start = end = 0;
	au = NULL;
	com = NULL;
	inf = NULL;

	fps = 25.0;
	if (mux->frame_rate) fps = mux->frame_rate;

	line = 0;
	first_samp = 1;
	while (1) {
		char *sOK = fgets(szLine, 2048, sub_in);
		if (!sOK) break;
		REM_TRAIL_MARKS(szLine, "\r\n\t ")

		line++;
		len = strlen(szLine); 
		if (!len) continue;

		i=0;
		if (szLine[i] != '{') {
			GF_LOG(GF_LOG_ERROR, GF_LOG_PARSER, ("[sub->bifs] Bad frame (line %d): expecting \"{\" got \"%c\"\n", line, szLine[i]));
			e = GF_NON_COMPLIANT_BITSTREAM;
			break;
		}
		while (szLine[i+1] && szLine[i+1]!='}') { szTime[i] = szLine[i+1]; i++; }
		szTime[i] = 0;
		start = atoi(szTime);
		if (start<end) {
			GF_LOG(GF_LOG_WARNING, GF_LOG_PARSER, ("[sub->bifs] corrupted SUB frame (line %d) - starts (at %d ms) before end of previous one (%d ms) - adjusting time stamps\n", line, start, end));
			start = end;
		}
		j=i+2;
		i=0;
		if (szLine[i+j] != '{') {
			GF_LOG(GF_LOG_ERROR, GF_LOG_PARSER, ("[sub->bifs] Bad frame - expecting \"{\" got \"%c\"\n", szLine[i]));
			e = GF_NON_COMPLIANT_BITSTREAM;
			break;
		}
		while (szLine[i+1+j] && szLine[i+1+j]!='}') { szTime[i] = szLine[i+1+j]; i++; }
		szTime[i] = 0;
		end = atoi(szTime);
		j+=i+2;

		if (start>end) {
			GF_LOG(GF_LOG_WARNING, GF_LOG_PARSER, ("[sub->bifs] corrupted frame (line %d) - ends (at %d ms) before start of current frame (%d ms) - skipping\n", line, end, start));
			continue;
		}

		if (start && first_samp) {
			au = gf_sm_stream_au_new(srt, 0, 0, 1);
			com = gf_sg_command_new(ctx->scene_graph, GF_SG_FIELD_REPLACE);
			com->node = text;
			gf_node_register(text, NULL);
			inf = gf_sg_command_field_new(com);
			inf->fieldIndex = string.fieldIndex;
			inf->fieldType = string.fieldType;
			inf->field_ptr = gf_sg_vrml_field_pointer_new(string.fieldType);
			gf_list_add(au->commands, com);
		}

		k=0;
		for (i=j; i<len; i++) {
			if (szLine[i]=='|') {
				szText[k] = '\n';
			} else {
				if (szLine[i] & 0x80) {
					/*non UTF8 (likely some win-CP)*/
					if ( (szLine[i+1] & 0xc0) != 0x80) {
						szText[k] = 0xc0 | ( (szLine[i] >> 6) & 0x3 );
						k++;
						szLine[i] &= 0xbf;
					}
					/*we only handle UTF8 chars on 2 bytes (eg first byte is 0b110xxxxx)*/
					else if ( (szLine[i] & 0xe0) == 0xc0) {
						szText[k] = szLine[i];
						i++;
						k++;
					}
				}
				szText[k] = szLine[i];
			}
			k++;
		}
		szText[i-j] = 0;

		com = gf_sg_command_new(ctx->scene_graph, GF_SG_FIELD_REPLACE);
		com->node = text;
		gf_node_register(text, NULL);
		inf = gf_sg_command_field_new(com);
		inf->fieldIndex = string.fieldIndex;
		inf->fieldType = string.fieldType;
		inf->field_ptr = gf_sg_vrml_field_pointer_new(string.fieldType);
		gf_list_add(au->commands, com);

		gf_sg_vrml_mf_append(inf->field_ptr, GF_SG_VRML_MFSTRING, (void **) &sfstr);
		sfstr->buffer = strdup(szText);
	}

	if (e) gf_sm_stream_del(ctx, srt);
	fclose(sub_in);
	return e;
}

GF_EXPORT
GF_Err gf_sm_import_bifs_subtitle(GF_SceneManager *ctx, GF_ESD *src, GF_MuxInfo *mux)
{
	GF_Err e;
	u32 fmt;
	e = gf_text_guess_format(mux->file_name, &fmt);
	if (e) return e;
	if (!fmt || (fmt>=3)) return GF_NOT_SUPPORTED;

	if (fmt==1) return gf_text_import_srt_bifs(ctx, src, mux);
	else return gf_text_import_sub_bifs(ctx, src, mux);
}