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ffmpeg.wasm-core
Commit 6bbd7c7b authored by Aurelien Jacobs's avatar Aurelien Jacobs
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matroskadec: use generic parser to parse chapters 

Originally committed as revision 14559 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent 434d496a
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Showing with 49 additions and 148 deletions
libavformat/matroskadec.c
View file @ 6bbd7c7b
......@@ -158,6 +158,13 @@ typedef struct MatroskaSubtitleTrack {
sizeof(MatroskaAudioTrack), \
sizeof(MatroskaSubtitleTrack)))
typedef struct {
uint64_t start;
uint64_t end;
uint64_t uid;
char *title;
} MatroskaChapter;
typedef struct {
uint64_t track;
uint64_t pos;
......@@ -183,6 +190,7 @@ typedef struct MatroskaDemuxContext {
/* timescale in the file */
int64_t time_scale;
EbmlList chapters;
EbmlList index;
/* num_streams is the number of streams that av_new_stream() was called
......@@ -230,6 +238,37 @@ static EbmlSyntax ebml_syntax[] = {
{ 0 }
};
static EbmlSyntax matroska_chapter_display[] = {
{ MATROSKA_ID_CHAPSTRING, EBML_UTF8, 0, offsetof(MatroskaChapter,title) },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_chapter_entry[] = {
{ MATROSKA_ID_CHAPTERTIMESTART, EBML_UINT, 0, offsetof(MatroskaChapter,start), {.u=AV_NOPTS_VALUE} },
{ MATROSKA_ID_CHAPTERTIMEEND, EBML_UINT, 0, offsetof(MatroskaChapter,end), {.u=AV_NOPTS_VALUE} },
{ MATROSKA_ID_CHAPTERUID, EBML_UINT, 0, offsetof(MatroskaChapter,uid) },
{ MATROSKA_ID_CHAPTERDISPLAY, EBML_NEST, 0, 0, {.n=matroska_chapter_display} },
{ MATROSKA_ID_CHAPTERFLAGHIDDEN, EBML_NONE },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_chapter[] = {
{ MATROSKA_ID_CHAPTERATOM, EBML_NEST, sizeof(MatroskaChapter), offsetof(MatroskaDemuxContext,chapters), {.n=matroska_chapter_entry} },
{ MATROSKA_ID_EDITIONUID, EBML_NONE },
{ MATROSKA_ID_EDITIONFLAGHIDDEN, EBML_NONE },
{ MATROSKA_ID_EDITIONFLAGDEFAULT, EBML_NONE },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_chapters[] = {
{ MATROSKA_ID_EDITIONENTRY, EBML_NEST, 0, 0, {.n=matroska_chapter} },
{ EBML_ID_VOID, EBML_NONE },
{ 0 }
};
static EbmlSyntax matroska_index_pos[] = {
{ MATROSKA_ID_CUETRACK, EBML_UINT, 0, offsetof(MatroskaIndexPos,track) },
{ MATROSKA_ID_CUECLUSTERPOSITION, EBML_UINT, 0, offsetof(MatroskaIndexPos,pos) },
......@@ -2063,154 +2102,18 @@ static int
matroska_parse_chapters(AVFormatContext *s)
{
MatroskaDemuxContext *matroska = s->priv_data;
int res = 0;
uint32_t id;
av_log(s, AV_LOG_DEBUG, "parsing chapters...\n");
while (res == 0) {
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
res = AVERROR(EIO);
break;
} else if (matroska->level_up) {
matroska->level_up--;
break;
}
switch (id) {
case MATROSKA_ID_EDITIONENTRY: {
uint64_t end = AV_NOPTS_VALUE, start = AV_NOPTS_VALUE;
int64_t uid= -1;
char* title = NULL;
/* if there is more than one chapter edition
we take only the first one */
if(s->chapters) {
ebml_read_skip(matroska);
break;
}
if ((res = ebml_read_master(matroska, &id)) < 0)
break;
while (res == 0) {
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
res = AVERROR(EIO);
break;
} else if (matroska->level_up) {
matroska->level_up--;
break;
}
switch (id) {
case MATROSKA_ID_CHAPTERATOM:
if ((res = ebml_read_master(matroska, &id)) < 0)
break;
while (res == 0) {
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
res = AVERROR(EIO);
break;
} else if (matroska->level_up) {
matroska->level_up--;
break;
}
switch (id) {
case MATROSKA_ID_CHAPTERTIMEEND:
res = ebml_read_uint(matroska, &id, &end);
break;
case MATROSKA_ID_CHAPTERTIMESTART:
res = ebml_read_uint(matroska, &id, &start);
break;
case MATROSKA_ID_CHAPTERDISPLAY:
if ((res = ebml_read_master(matroska, &id)) < 0)
break;
while (res == 0) {
if (!(id = ebml_peek_id(matroska, &matroska->level_up))) {
res = AVERROR(EIO);
break;
} else if (matroska->level_up) {
matroska->level_up--;
break;
}
switch (id) {
case MATROSKA_ID_CHAPSTRING:
res = ebml_read_utf8(matroska, &id, &title);
break;
default:
av_log(s, AV_LOG_INFO, "Ignoring unknown Chapter display ID 0x%x\n", id);
case EBML_ID_VOID:
res = ebml_read_skip(matroska);
break;
}
if (matroska->level_up) {
matroska->level_up--;
break;
}
}
break;
case MATROSKA_ID_CHAPTERUID:
res = ebml_read_uint(matroska, &id, &uid);
break;
default:
av_log(s, AV_LOG_INFO, "Ignoring unknown Chapter atom ID 0x%x\n", id);
case MATROSKA_ID_CHAPTERFLAGHIDDEN:
case EBML_ID_VOID:
res = ebml_read_skip(matroska);
break;
}
if (matroska->level_up) {
matroska->level_up--;
break;
}
}
if (start != AV_NOPTS_VALUE && uid != -1) {
if(!ff_new_chapter(s, uid, (AVRational){1, 1000000000}, start, end, title))
res= AVERROR(ENOMEM);
}
av_free(title);
break;
EbmlList *chapters_list = &matroska->chapters;
MatroskaChapter *chapters;
int i, res;
default:
av_log(s, AV_LOG_INFO, "Ignoring unknown Edition entry ID 0x%x\n", id);
case MATROSKA_ID_EDITIONUID:
case MATROSKA_ID_EDITIONFLAGHIDDEN:
case MATROSKA_ID_EDITIONFLAGDEFAULT:
case EBML_ID_VOID:
res = ebml_read_skip(matroska);
break;
}
res = ebml_parse(matroska, matroska_chapters, matroska, MATROSKA_ID_CHAPTERS, 0);
if (matroska->level_up) {
matroska->level_up--;
break;
}
}
break;
}
default:
av_log(s, AV_LOG_INFO, "Expected an Edition entry (0x%x), but found 0x%x\n", MATROSKA_ID_EDITIONENTRY, id);
case EBML_ID_VOID:
res = ebml_read_skip(matroska);
break;
}
if (matroska->level_up) {
matroska->level_up--;
break;
}
}
chapters = chapters_list->elem;
for (i=0; i<chapters_list->nb_elem; i++)
if (chapters[i].start != AV_NOPTS_VALUE && chapters[i].uid)
ff_new_chapter(s, chapters[i].uid, (AVRational){1, 1000000000},
chapters[i].start, chapters[i].end,
chapters[i].title);
return res;
}
......@@ -2357,8 +2260,6 @@ matroska_read_header (AVFormatContext *s,
}
case MATROSKA_ID_CHAPTERS: {
if ((res = ebml_read_master(matroska, &id)) < 0)
return res;
res = matroska_parse_chapters(s);
break;
}
......
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