[FFmpeg-devel] [PATCHv3] mov: Evaluate the movie display matrix
Vittorio Giovara
vittorio.giovara at gmail.com
Fri Oct 14 01:50:19 EEST 2016
This matrix needs to be applied after all others have (currently only
display matrix from trak), but cannot be handled in movie box, since
streams are not allocated yet. So store it in main context, and apply
it when appropriate, that is after parsing the tkhd one.
Signed-off-by: Vittorio Giovara <vittorio.giovara at gmail.com>
---
Reworked second matrix handling so that it is always applied, which makes
the code easier to read and test. Updated according reviews, rolled back
a couple of points for the reasons explained in the thread.
Needs a new sample to be uploaded to fate,
https://www.dropbox.com/s/qfio4bjhkpz3p4o/displaymatrix.mov?dl=0,
the previous one can be deleted.
Cheers,
Vittorio
libavformat/isom.h | 2 ++
libavformat/mov.c | 53 +++++++++++++++++++++++++++++++--------
tests/fate/mov.mak | 6 ++++-
tests/ref/fate/mov-display-matrix | 10 ++++++++
4 files changed, 59 insertions(+), 12 deletions(-)
create mode 100644 tests/ref/fate/mov-display-matrix
diff --git a/libavformat/isom.h b/libavformat/isom.h
index 2246fed..2aeb8fa 100644
--- a/libavformat/isom.h
+++ b/libavformat/isom.h
@@ -238,6 +238,8 @@ typedef struct MOVContext {
uint8_t *decryption_key;
int decryption_key_len;
int enable_drefs;
+
+ int32_t movie_display_matrix[3][3]; ///< display matrix from mvhd
} MOVContext;
int ff_mp4_read_descr_len(AVIOContext *pb);
diff --git a/libavformat/mov.c b/libavformat/mov.c
index a15c8d1..e8da77f 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -1211,6 +1211,7 @@ static int mov_read_mdhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
static int mov_read_mvhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
+ int i;
int64_t creation_time;
int version = avio_r8(pb); /* version */
avio_rb24(pb); /* flags */
@@ -1238,7 +1239,12 @@ static int mov_read_mvhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
avio_skip(pb, 10); /* reserved */
- avio_skip(pb, 36); /* display matrix */
+ /* movie display matrix, store it in main context and use it later on */
+ for (i = 0; i < 3; i++) {
+ c->movie_display_matrix[i][0] = avio_rb32(pb); // 16.16 fixed point
+ c->movie_display_matrix[i][1] = avio_rb32(pb); // 16.16 fixed point
+ c->movie_display_matrix[i][2] = avio_rb32(pb); // 2.30 fixed point
+ }
avio_rb32(pb); /* preview time */
avio_rb32(pb); /* preview duration */
@@ -3798,16 +3804,33 @@ static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)
return 0;
}
+// return 0 when matrix is identity, 1 otherwise
+#define IS_MATRIX_FULL(matrix) \
+ (matrix[0][0] != (1 << 16) || \
+ matrix[1][1] != (1 << 16) || \
+ matrix[2][2] != (1 << 30) || \
+ matrix[0][1] || matrix[0][2] || \
+ matrix[1][0] || matrix[1][2] || \
+ matrix[2][0] || matrix[2][1])
+
+// fixed point to double
+#define CONV_FP(x, sh) ((double) (x)) / (1 << (sh))
+
+// double to fixed point
+#define CONV_DB(x, sh) ((int32_t) ((x) * (1 << (sh))))
+
static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
- int i;
+ int i, j, e;
int width;
int height;
int display_matrix[3][3];
+ int res_display_matrix[3][3];
AVStream *st;
MOVStreamContext *sc;
int version;
int flags;
+ double val = 0;
if (c->fc->nb_streams < 1)
return 0;
@@ -3853,15 +3876,22 @@ static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
sc->width = width >> 16;
sc->height = height >> 16;
+ // apply the moov display matrix
+ for (i = 0; i < 3; i++) {
+ for (j = 0; j < 3; j++) {
+ int sh = j == 2 ? 30 : 16;
+ for (e = 0; e < 3; e++) {
+ val += CONV_FP(display_matrix[i][e], sh) *
+ CONV_FP(c->movie_display_matrix[e][j], sh);
+ }
+ res_display_matrix[i][j] = CONV_DB(val, sh);
+ val = 0;
+ }
+ }
+
// save the matrix and add rotate metadata when it is not the default
// identity
- if (display_matrix[0][0] != (1 << 16) ||
- display_matrix[1][1] != (1 << 16) ||
- display_matrix[2][2] != (1 << 30) ||
- display_matrix[0][1] || display_matrix[0][2] ||
- display_matrix[1][0] || display_matrix[1][2] ||
- display_matrix[2][0] || display_matrix[2][1]) {
- int i, j;
+ if (IS_MATRIX_FULL(res_display_matrix)) {
double rotate;
av_freep(&sc->display_matrix);
@@ -3871,7 +3901,7 @@ static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
for (i = 0; i < 3; i++)
for (j = 0; j < 3; j++)
- sc->display_matrix[i * 3 + j] = display_matrix[i][j];
+ sc->display_matrix[i * 3 + j] = res_display_matrix[i][j];
rotate = av_display_rotation_get(sc->display_matrix);
if (!isnan(rotate)) {
@@ -3890,7 +3920,8 @@ static int mov_read_tkhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
double disp_transform[2];
for (i = 0; i < 2; i++)
- disp_transform[i] = hypot(display_matrix[i][0], display_matrix[i][1]);
+ disp_transform[i] = hypot(sc->display_matrix[i * 3],
+ sc->display_matrix[i * 3 + 1]);
if (disp_transform[0] > 0 && disp_transform[1] > 0 &&
disp_transform[0] < (1<<24) && disp_transform[1] < (1<<24) &&
diff --git a/tests/fate/mov.mak b/tests/fate/mov.mak
index 4b5885b..42a4296 100644
--- a/tests/fate/mov.mak
+++ b/tests/fate/mov.mak
@@ -4,7 +4,8 @@ FATE_MOV = fate-mov-3elist \
fate-mov-1elist-noctts \
fate-mov-elist-starts-ctts-2ndsample \
fate-mov-1elist-ends-last-bframe \
- fate-mov-2elist-elist1-ends-bframe
+ fate-mov-2elist-elist1-ends-bframe \
+ fate-mov-display-matrix \
FATE_SAMPLES_AVCONV += $(FATE_MOV)
@@ -26,3 +27,6 @@ fate-mov-1elist-ends-last-bframe: CMD = framemd5 -i $(TARGET_SAMPLES)/mov/mov-1e
# Makes sure that we handle timestamps of packets in case of multiple edit lists with one of them ending on a B-frame correctly.
fate-mov-2elist-elist1-ends-bframe: CMD = framemd5 -i $(TARGET_SAMPLES)/mov/mov-2elist-elist1-ends-bframe.mov
+
+# File contains both a movie and a track display matrix
+fate-mov-display-matrix: CMD = framemd5 -i $(TARGET_SAMPLES)/mov/displaymatrix.mov -frames 1
diff --git a/tests/ref/fate/mov-display-matrix b/tests/ref/fate/mov-display-matrix
new file mode 100644
index 0000000..762e421
--- /dev/null
+++ b/tests/ref/fate/mov-display-matrix
@@ -0,0 +1,10 @@
+#format: frame checksums
+#version: 2
+#hash: MD5
+#tb 0: 1001/30000
+#media_type 0: video
+#codec_id 0: rawvideo
+#dimensions 0: 240x160
+#sar 0: 1/2
+#stream#, dts, pts, duration, size, hash
+0, 0, 0, 1, 57600, be949aa661551010f461069804f68e76
--
2.10.0
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