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h264: parse frame packing arrangement SEI messages and save relevant stereo3d information

This commit is contained in:
Vittorio Giovara 2013-02-20 16:34:58 +01:00
parent 7e244c6860
commit 5b10ef729f
3 changed files with 91 additions and 1 deletions
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41
libavcodec/h264.c
View File

@ -27,6 +27,7 @@
#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "libavutil/stereo3d.h"
#include "internal.h"
#include "cabac.h"
#include "cabac_functions.h"
@ -2029,6 +2030,46 @@ static void decode_postinit(H264Context *h, int setup_finished)
}
}
if (h->sei_frame_packing_present &&
h->frame_packing_arrangement_type >= 0 &&
h->frame_packing_arrangement_type <= 6 &&
h->content_interpretation_type > 0 &&
h->content_interpretation_type < 3) {
AVStereo3D *stereo = av_stereo3d_create_side_data(&cur->f);
if (!stereo)
return;
switch (h->frame_packing_arrangement_type) {
case 0:
stereo->type = AV_STEREO3D_CHECKERBOARD;
break;
case 1:
stereo->type = AV_STEREO3D_LINES;
break;
case 2:
stereo->type = AV_STEREO3D_COLUMNS;
break;
case 3:
if (h->quincunx_subsampling)
stereo->type = AV_STEREO3D_SIDEBYSIDE_QUINCUNX;
else
stereo->type = AV_STEREO3D_SIDEBYSIDE;
break;
case 4:
stereo->type = AV_STEREO3D_TOPBOTTOM;
break;
case 5:
stereo->type = AV_STEREO3D_FRAMESEQUENCE;
break;
case 6:
stereo->type = AV_STEREO3D_2D;
break;
}
if (h->content_interpretation_type == 2)
stereo->flags = AV_STEREO3D_FLAG_INVERT;
}
// FIXME do something with unavailable reference frames
/* Sort B-frames into display order */

11
libavcodec/h264.h
View File

@ -123,7 +123,8 @@ typedef enum {
SEI_BUFFERING_PERIOD = 0, ///< buffering period (H.264, D.1.1)
SEI_TYPE_PIC_TIMING = 1, ///< picture timing
SEI_TYPE_USER_DATA_UNREGISTERED = 5, ///< unregistered user data
SEI_TYPE_RECOVERY_POINT = 6 ///< recovery point (frame # to decoder sync)
SEI_TYPE_RECOVERY_POINT = 6, ///< recovery point (frame # to decoder sync)
SEI_TYPE_FRAME_PACKING = 45, ///< frame packing arrangement
} SEI_Type;
/**
@ -585,6 +586,14 @@ typedef struct H264Context {
*/
int prev_interlaced_frame;
/**
* frame_packing_arrangment SEI message
*/
int sei_frame_packing_present;
int frame_packing_arrangement_type;
int content_interpretation_type;
int quincunx_subsampling;
/**
* 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

40
libavcodec/h264_sei.c
View File

@ -42,6 +42,7 @@ void ff_h264_reset_sei(H264Context *h)
h->sei_dpb_output_delay = 0;
h->sei_cpb_removal_delay = -1;
h->sei_buffering_period_present = 0;
h->sei_frame_packing_present = 0;
}
static int decode_picture_timing(H264Context *h)
@ -175,6 +176,40 @@ static int decode_buffering_period(H264Context *h)
return 0;
}
static int decode_frame_packing_arrangement(H264Context *h)
{
int cancel;
int quincunx = 0;
int content = -1;
int type = -1;
get_ue_golomb(&h->gb); // frame_packing_arrangement_id
cancel = get_bits1(&h->gb); // frame_packing_arrangement_cancel_flag
if (cancel == 0) {
type = get_bits(&h->gb, 7); // frame_packing_arrangement_type
quincunx = get_bits1(&h->gb); // quincunx_sampling_flag
content = get_bits(&h->gb, 6); // content_interpretation_type
// the following skips: spatial_flipping_flag, frame0_flipped_flag,
// field_views_flag, current_frame_is_frame0_flag,
// frame0_self_contained_flag, frame1_self_contained_flag
skip_bits(&h->gb, 6);
if (quincunx == 0 && type != 5)
skip_bits(&h->gb, 16); // frame[01]_grid_position_[xy]
skip_bits(&h->gb, 8); // frame_packing_arrangement_reserved_byte
get_ue_golomb(&h->gb); // frame_packing_arrangement_repetition_period
}
skip_bits1(&h->gb); // frame_packing_arrangement_extension_flag
h->sei_frame_packing_present = (cancel == 0);
h->frame_packing_arrangement_type = type;
h->content_interpretation_type = content;
h->quincunx_subsampling = quincunx;
return 0;
}
int ff_h264_decode_sei(H264Context *h)
{
while (get_bits_left(&h->gb) > 16) {
@ -217,6 +252,11 @@ int ff_h264_decode_sei(H264Context *h)
if (ret < 0)
return ret;
break;
case SEI_TYPE_FRAME_PACKING:
ret = decode_frame_packing_arrangement(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);