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h264: parse display orientation SEI message 

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
This commit is contained in:
Vittorio Giovara 2014-07-02 11:58:19 -04:00
parent a54f03bf07
commit 18e3d61e9e
3 changed files with 45 additions and 0 deletions
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15
libavcodec/h264.c
View File

@ -26,6 +26,7 @@
*/
#include "libavutil/avassert.h"
#include "libavutil/display.h"
#include "libavutil/imgutils.h"
#include "libavutil/stereo3d.h"
#include "libavutil/timer.h"
@ -822,6 +823,20 @@ static void decode_postinit(H264Context *h, int setup_finished)
stereo->flags = AV_STEREO3D_FLAG_INVERT;
}
if (h->sei_display_orientation_present &&
(h->sei_anticlockwise_rotation || h->sei_hflip || h->sei_vflip)) {
double angle = h->sei_anticlockwise_rotation * 360 / (double) (1 << 16);
AVFrameSideData *rotation = av_frame_new_side_data(&cur->f,
AV_FRAME_DATA_DISPLAYMATRIX,
sizeof(int32_t) * 9);
if (!rotation)
return;
av_display_rotation_set((int32_t *)rotation->data, angle);
av_display_matrix_flip((int32_t *)rotation->data,
h->sei_vflip, h->sei_hflip);
}
// FIXME do something with unavailable reference frames
/* Sort B-frames into display order */

8
libavcodec/h264.h
View File

@ -132,6 +132,7 @@ typedef enum {
SEI_TYPE_USER_DATA_UNREGISTERED = 5, ///< unregistered user data
SEI_TYPE_RECOVERY_POINT = 6, ///< recovery point (frame # to decoder sync)
SEI_TYPE_FRAME_PACKING = 45, ///< frame packing arrangement
SEI_TYPE_DISPLAY_ORIENTATION = 47, ///< display orientation
} SEI_Type;
/**
@ -633,6 +634,13 @@ typedef struct H264Context {
int content_interpretation_type;
int quincunx_subsampling;
/**
* display orientation SEI message
*/
int sei_display_orientation_present;
int sei_anticlockwise_rotation;
int sei_hflip, sei_vflip;
/**
* Bit set of clock types for fields/frames in picture timing SEI message.
* For each found ct_type, appropriate bit is set (e.g., bit 1 for

22
libavcodec/h264_sei.c
View File

@ -41,6 +41,7 @@ void ff_h264_reset_sei(H264Context *h)
h->sei_cpb_removal_delay = -1;
h->sei_buffering_period_present = 0;
h->sei_frame_packing_present = 0;
h->sei_display_orientation_present = 0;
}
static int decode_picture_timing(H264Context *h)
@ -199,6 +200,22 @@ static int decode_frame_packing_arrangement(H264Context *h)
return 0;
}
static int decode_display_orientation(H264Context *h)
{
h->sei_display_orientation_present = !get_bits1(&h->gb);
if (h->sei_display_orientation_present) {
h->sei_hflip = get_bits1(&h->gb); // hor_flip
h->sei_vflip = get_bits1(&h->gb); // ver_flip
h->sei_anticlockwise_rotation = get_bits(&h->gb, 16);
get_ue_golomb(&h->gb); // display_orientation_repetition_period
skip_bits1(&h->gb); // display_orientation_extension_flag
}
return 0;
}
int ff_h264_decode_sei(H264Context *h)
{
while (get_bits_left(&h->gb) > 16) {
@ -246,6 +263,11 @@ int ff_h264_decode_sei(H264Context *h)
if (ret < 0)
return ret;
break;
case SEI_TYPE_DISPLAY_ORIENTATION:
ret = decode_display_orientation(h);
if (ret < 0)
return ret;
break;
default:
av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
skip_bits(&h->gb, 8 * size);