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avformat/matroskadec: set aspect ratio only when DisplayWidth and DisplayHeight are in pixels

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A missing DisplayUnit element or one with the default value of 0 means
DisplayWidth and DisplayHeight should be interpreted as pixels.

The current code setting st->sample_aspect_ratio is wrong when DisplayUnit
is anything else.

Reviewed-by: Carl Eugen Hoyos <ceffmpeg@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2016-10-15 18:01:50 -03:00
parent 8e53c1567c
commit bad8bbc26a
2 changed files with 17 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
libavformat/matroska.h
View File

@ -309,6 +309,14 @@ typedef enum {
MATROSKA_VIDEO_STEREOMODE_TYPE_NB,
} MatroskaVideoStereoModeType;
typedef enum {
MATROSKA_VIDEO_DISPLAYUNIT_PIXELS = 0,
MATROSKA_VIDEO_DISPLAYUNIT_CENTIMETERS = 1,
MATROSKA_VIDEO_DISPLAYUNIT_INCHES = 2,
MATROSKA_VIDEO_DISPLAYUNIT_DAR = 3,
MATROSKA_VIDEO_DISPLAYUNIT_UNKNOWN = 4,
} MatroskaVideoDisplayUnit;
/*
* Matroska Codec IDs, strings
*/

15
libavformat/matroskadec.c
View File

@ -168,6 +168,7 @@ typedef struct MatroskaTrackVideo {
uint64_t pixel_width;
uint64_t pixel_height;
EbmlBin color_space;
uint64_t display_unit;
uint64_t interlaced;
uint64_t field_order;
uint64_t stereo_mode;
@ -436,7 +437,7 @@ static const EbmlSyntax matroska_track_video[] = {
{ MATROSKA_ID_VIDEOPIXELCROPT, EBML_NONE },
{ MATROSKA_ID_VIDEOPIXELCROPL, EBML_NONE },
{ MATROSKA_ID_VIDEOPIXELCROPR, EBML_NONE },
{ MATROSKA_ID_VIDEODISPLAYUNIT, EBML_NONE },
{ MATROSKA_ID_VIDEODISPLAYUNIT, EBML_UINT, 0, offsetof(MatroskaTrackVideo, display_unit), { .u= MATROSKA_VIDEO_DISPLAYUNIT_PIXELS } },
{ MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_UINT, 0, offsetof(MatroskaTrackVideo, interlaced), { .u = MATROSKA_VIDEO_INTERLACE_FLAG_UNDETERMINED } },
{ MATROSKA_ID_VIDEOFIELDORDER, EBML_UINT, 0, offsetof(MatroskaTrackVideo, field_order), { .u = MATROSKA_VIDEO_FIELDORDER_UNDETERMINED } },
{ MATROSKA_ID_VIDEOSTEREOMODE, EBML_UINT, 0, offsetof(MatroskaTrackVideo, stereo_mode), { .u = MATROSKA_VIDEO_STEREOMODE_TYPE_NB } },
@ -2296,11 +2297,13 @@ static int matroska_parse_tracks(AVFormatContext *s)
if (track->video.stereo_mode && track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB)
mkv_stereo_mode_display_mul(track->video.stereo_mode, &display_width_mul, &display_height_mul);
av_reduce(&st->sample_aspect_ratio.num,
&st->sample_aspect_ratio.den,
st->codecpar->height * track->video.display_width * display_width_mul,
st->codecpar->width * track->video.display_height * display_height_mul,
255);
if (track->video.display_unit == MATROSKA_VIDEO_DISPLAYUNIT_PIXELS) {
av_reduce(&st->sample_aspect_ratio.num,
&st->sample_aspect_ratio.den,
st->codecpar->height * track->video.display_width * display_width_mul,
st->codecpar->width * track->video.display_height * display_height_mul,
255);
}
if (st->codecpar->codec_id != AV_CODEC_ID_HEVC)
st->need_parsing = AVSTREAM_PARSE_HEADERS;