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FFmpeg/libavcodec/mpegutils.c
Andreas Rheinhardt f5d5b80f3c avcodec/mpegutils: Don't use MB_TYPE_L[01] for mpegvideo 
MB_TYPE_L[01] is based upon H.264 terminology (it stands for
list); yet the mpegvideo based decoders don't have lists
of reference frames, they have at most one forward and one
backward reference. So use terminology based upon this.

This also has a second advantage: MB_TYPE_L[01] is actually
an OR of two flags (which are set independently for H.264,
but aren't for mpegvideo). Switching to different flags
makes the flags fit into an int16_t, which will be useful
in future commits.

The only downside to this is a very small amount of code
in error_resilience.c and mpegutils.c (the only code shared
between the H.264 decoder and mpegvideo).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-06-20 18:58:38 +02:00

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/*
* Mpeg video formats-related defines and utility functions
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include "libavutil/bprint.h"
#include "libavutil/common.h"
#include "libavutil/emms.h"
#include "libavutil/frame.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "libavutil/motion_vector.h"
#include "libavutil/avassert.h"
#include "avcodec.h"
#include "mpegutils.h"
static int add_mb(AVMotionVector *mb, uint32_t mb_type,
int dst_x, int dst_y,
int motion_x, int motion_y, int motion_scale,
int direction)
{
mb->w = IS_8X8(mb_type) || IS_8X16(mb_type) ? 8 : 16;
mb->h = IS_8X8(mb_type) || IS_16X8(mb_type) ? 8 : 16;
mb->motion_x = motion_x;
mb->motion_y = motion_y;
mb->motion_scale = motion_scale;
mb->dst_x = dst_x;
mb->dst_y = dst_y;
mb->src_x = dst_x + motion_x / motion_scale;
mb->src_y = dst_y + motion_y / motion_scale;
mb->source = direction ? 1 : -1;
mb->flags = 0; // XXX: does mb_type contain extra information that could be exported here?
return 1;
}
void ff_draw_horiz_band(AVCodecContext *avctx,
const AVFrame *cur, const AVFrame *last,
int y, int h, int picture_structure,
int first_field, int low_delay)
{
const int field_pic = picture_structure != PICT_FRAME;
const AVFrame *src;
int offset[AV_NUM_DATA_POINTERS];
if (!avctx->draw_horiz_band)
return;
if (field_pic) {
h <<= 1;
y <<= 1;
}
h = FFMIN(h, avctx->height - y);
if (field_pic && first_field &&
!(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD))
return;
if (cur->pict_type == AV_PICTURE_TYPE_B || low_delay ||
(avctx->slice_flags & SLICE_FLAG_CODED_ORDER))
src = cur;
else if (last)
src = last;
else
return;
if (cur->pict_type == AV_PICTURE_TYPE_B &&
picture_structure == PICT_FRAME &&
avctx->codec_id != AV_CODEC_ID_SVQ3) {
for (int i = 0; i < AV_NUM_DATA_POINTERS; i++)
offset[i] = 0;
} else {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);
int vshift = desc->log2_chroma_h;
offset[0] = y * src->linesize[0];
offset[1] =
offset[2] = (y >> vshift) * src->linesize[1];
for (int i = 3; i < AV_NUM_DATA_POINTERS; i++)
offset[i] = 0;
}
emms_c();
avctx->draw_horiz_band(avctx, src, offset,
y, picture_structure, h);
}
#define HAS_MV_EXT(mb_type, flags, dir) ((mb_type) & flags[(dir)])
static char get_type_mv_char(int mb_type, const int mb_type_mv_flags[2])
{
// Type & MV direction
if (IS_PCM(mb_type))
return 'P';
else if (IS_ACPRED(mb_type))
return 'A';
else if (IS_INTRA4x4(mb_type))
return 'i';
else if (IS_INTRA16x16(mb_type))
return 'I';
else if (IS_DIRECT(mb_type) && IS_SKIP(mb_type))
return 'd';
else if (IS_DIRECT(mb_type))
return 'D';
else if (IS_GMC(mb_type) && IS_SKIP(mb_type))
return 'g';
else if (IS_GMC(mb_type))
return 'G';
else if (IS_SKIP(mb_type))
return 'S';
else if (!HAS_MV_EXT(mb_type, 1, mb_type_mv_flags))
return '>';
else if (!HAS_MV_EXT(mb_type, 0, mb_type_mv_flags))
return '<';
else {
av_assert2(HAS_MV_EXT(mb_type, 0, mb_type_mv_flags) && HAS_MV_EXT(mb_type, 1, mb_type_mv_flags));
return 'X';
}
}
static char get_segmentation_char(int mb_type)
{
if (IS_8X8(mb_type))
return '+';
else if (IS_16X8(mb_type))
return '-';
else if (IS_8X16(mb_type))
return '|';
else if (IS_INTRA(mb_type) || IS_16X16(mb_type))
return ' ';
return '?';
}
static char get_interlacement_char(int mb_type)
{
if (IS_INTERLACED(mb_type))
return '=';
else
return ' ';
}
void ff_print_debug_info2(AVCodecContext *avctx, AVFrame *pict,
const uint8_t *mbskip_table, const uint32_t *mbtype_table,
const int8_t *qscale_table, int16_t (*const motion_val[2])[2],
int mb_width, int mb_height, int mb_stride, int quarter_sample)
{
const int is_h264 = avctx->codec_id == AV_CODEC_ID_H264;
const int mb_type_mv_flags[2] = { is_h264 ? MB_TYPE_L0 : MB_TYPE_FORWARD_MV,
is_h264 ? MB_TYPE_L1 : MB_TYPE_BACKWARD_MV };
if ((avctx->export_side_data & AV_CODEC_EXPORT_DATA_MVS) && mbtype_table && motion_val[0]) {
const int shift = 1 + quarter_sample;
const int scale = 1 << shift;
const int mv_sample_log2 = is_h264 ? 2 : 1;
const int mv_stride = (mb_width << mv_sample_log2) + !is_h264;
int mb_x, mb_y, mbcount = 0;
/* size is width * height * 2 * 4 where 2 is for directions and 4 is
* for the maximum number of MB (4 MB in case of IS_8x8) */
AVMotionVector *mvs = av_malloc_array(mb_width * mb_height, 2 * 4 * sizeof(AVMotionVector));
if (!mvs)
return;
for (mb_y = 0; mb_y < mb_height; mb_y++) {
for (mb_x = 0; mb_x < mb_width; mb_x++) {
int i, direction, mb_type = mbtype_table[mb_x + mb_y * mb_stride];
for (direction = 0; direction < 2; direction++) {
if (!HAS_MV_EXT(mb_type, direction, mb_type_mv_flags))
continue;
if (IS_8X8(mb_type)) {
for (i = 0; i < 4; i++) {
int sx = mb_x * 16 + 4 + 8 * (i & 1);
int sy = mb_y * 16 + 4 + 8 * (i >> 1);
int xy = (mb_x * 2 + (i & 1) +
(mb_y * 2 + (i >> 1)) * mv_stride) << (mv_sample_log2 - 1);
int mx = motion_val[direction][xy][0];
int my = motion_val[direction][xy][1];
mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
}
} else if (IS_16X8(mb_type)) {
for (i = 0; i < 2; i++) {
int sx = mb_x * 16 + 8;
int sy = mb_y * 16 + 4 + 8 * i;
int xy = (mb_x * 2 + (mb_y * 2 + i) * mv_stride) << (mv_sample_log2 - 1);
int mx = motion_val[direction][xy][0];
int my = motion_val[direction][xy][1];
if (IS_INTERLACED(mb_type))
my *= 2;
mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
}
} else if (IS_8X16(mb_type)) {
for (i = 0; i < 2; i++) {
int sx = mb_x * 16 + 4 + 8 * i;
int sy = mb_y * 16 + 8;
int xy = (mb_x * 2 + i + mb_y * 2 * mv_stride) << (mv_sample_log2 - 1);
int mx = motion_val[direction][xy][0];
int my = motion_val[direction][xy][1];
if (IS_INTERLACED(mb_type))
my *= 2;
mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
}
} else {
int sx = mb_x * 16 + 8;
int sy = mb_y * 16 + 8;
int xy = (mb_x + mb_y * mv_stride) << mv_sample_log2;
int mx = motion_val[direction][xy][0];
int my = motion_val[direction][xy][1];
mbcount += add_mb(mvs + mbcount, mb_type, sx, sy, mx, my, scale, direction);
}
}
}
}
if (mbcount) {
AVFrameSideData *sd;
av_log(avctx, AV_LOG_DEBUG, "Adding %d MVs info to frame %"PRId64"\n", mbcount, avctx->frame_num);
sd = av_frame_new_side_data(pict, AV_FRAME_DATA_MOTION_VECTORS, mbcount * sizeof(AVMotionVector));
if (!sd) {
av_freep(&mvs);
return;
}
memcpy(sd->data, mvs, mbcount * sizeof(AVMotionVector));
}
av_freep(&mvs);
}
/* TODO: export all the following to make them accessible for users (and filters) */
if (avctx->hwaccel || !mbtype_table)
return;
if (avctx->debug & (FF_DEBUG_SKIP | FF_DEBUG_QP | FF_DEBUG_MB_TYPE)) {
int x,y;
AVBPrint buf;
int n;
int margin_left;
int x_step;
av_log(avctx, AV_LOG_DEBUG, "New frame, type: %c\n",
av_get_picture_type_char(pict->pict_type));
margin_left = 2;
n = mb_width << 4;
while ((n /= 10))
margin_left++;
av_bprint_init(&buf, 1, AV_BPRINT_SIZE_UNLIMITED);
av_bprint_chars(&buf, ' ', margin_left);
n = 0;
if (avctx->debug & FF_DEBUG_SKIP)
n++;
if (avctx->debug & FF_DEBUG_QP)
n += 2;
if (avctx->debug & FF_DEBUG_MB_TYPE)
n += 3;
x_step = (mb_width * 16 > 999) ? 8 : 4;
for (x = 0; x < mb_width; x += x_step)
av_bprintf(&buf, "%-*d", n * x_step, x << 4);
av_log(avctx, AV_LOG_DEBUG, "%s\n", buf.str);
for (y = 0; y < mb_height; y++) {
av_bprint_clear(&buf);
for (x = 0; x < mb_width; x++) {
if (x == 0)
av_bprintf(&buf, "%*d ", margin_left - 1, y << 4);
if (avctx->debug & FF_DEBUG_SKIP) {
int count = mbskip_table ? mbskip_table[x + y * mb_stride] : 0;
if (count > 9)
count = 9;
av_bprintf(&buf, "%1d", count);
}
if (avctx->debug & FF_DEBUG_QP) {
av_bprintf(&buf, "%2d", qscale_table[x + y * mb_stride]);
}
if (avctx->debug & FF_DEBUG_MB_TYPE) {
int mb_type = mbtype_table[x + y * mb_stride];
av_bprintf(&buf, "%c%c%c",
get_type_mv_char(mb_type, mb_type_mv_flags),
get_segmentation_char(mb_type),
get_interlacement_char(mb_type));
}
}
av_log(avctx, AV_LOG_DEBUG, "%s\n", buf.str);
}
av_bprint_finalize(&buf, NULL);
}
}
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