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FFmpeg/libavcodec/svq1enc.c
Andreas Rheinhardt 894191e7e1 avcodec/svq1enc: Workaround GCC bug 102513 
GCC 11 has a bug: When it creates clones of recursive functions
(to inline some parameters), it clones a recursive function
eight times by default, even when this exceeds the recursion
depth. This happens with encode_block() in libavcodec/svq1enc.c
where a parameter level is always in the range 0..5;
but GCC 11 also creates functions corresponding to level UINT_MAX
and UINT_MAX - 1 (on -O3; -O2 is fine).

Using such levels would produce undefined behaviour and because
of this GCC emits bogus -Warray-bounds warnings for these clones.

Since commit d08b2900a9f0935959303da668cb00a8a7245228, certain
symbols that are accessed like ff_svq1_inter_multistage_vlc[level]
are declared with hidden visibility, which allows compilers
to bake the offset implied by level into the instructions
if level is a compile-time constant as it is in the clones.
Yet this leads to insane offsets for level == UINT_MAX which
can be incompatible with the supported offset ranges of relocations.
This happens in the small code model (the default code model for
AArch64).

This commit therefore works around this bug by disabling cloning
recursive functions for GCC 10 and 11. GCC 10 is affected by the
underlying bug (see
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102513), so the workaround
also targets it, although it only produces three versions of
encode_block(), so it does not seem to trigger the actual issue here.

The issue has been mitigated in GCC 12.1 (it no longer creates clones
for impossible values; see also commit
1cb7fd317c84117bbb13b14851d62f77f57bb9ce), so the workaround
does not target it.

Reported-by: J. Dekker <jdek@itanimul.li>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Signed-off-by: J. Dekker <jdek@itanimul.li>
2022-10-25 14:55:51 +02:00

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/*
* SVQ1 Encoder
* Copyright (C) 2004 Mike Melanson <melanson@pcisys.net>
*
* 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
*/
/**
* @file
* Sorenson Vector Quantizer #1 (SVQ1) video codec.
* For more information of the SVQ1 algorithm, visit:
* http://www.pcisys.net/~melanson/codecs/
*/
#include "avcodec.h"
#include "codec_internal.h"
#include "encode.h"
#include "hpeldsp.h"
#include "me_cmp.h"
#include "mpegvideo.h"
#include "h263.h"
#include "h263enc.h"
#include "internal.h"
#include "mpegutils.h"
#include "packet_internal.h"
#include "put_bits.h"
#include "svq1.h"
#include "svq1encdsp.h"
#include "svq1enc_cb.h"
#include "libavutil/avassert.h"
#include "libavutil/frame.h"
#include "libavutil/mem_internal.h"
// Workaround for GCC bug 102513
#if AV_GCC_VERSION_AT_LEAST(10, 0) && AV_GCC_VERSION_AT_MOST(12, 0) \
&& !defined(__clang__) && !defined(__INTEL_COMPILER)
#pragma GCC optimize ("no-ipa-cp-clone")
#endif
typedef struct SVQ1EncContext {
/* FIXME: Needed for motion estimation, should not be used for anything
* else, the idea is to make the motion estimation eventually independent
* of MpegEncContext, so this will be removed then. */
MpegEncContext m;
AVCodecContext *avctx;
MECmpContext mecc;
HpelDSPContext hdsp;
AVFrame *current_picture;
AVFrame *last_picture;
/* Some compression statistics */
enum AVPictureType pict_type;
int quality;
/* why ooh why this sick breadth first order,
* everything is slower and more complex */
PutBitContext reorder_pb[6];
int frame_width;
int frame_height;
/* Y plane block dimensions */
int y_block_width;
int y_block_height;
/* U & V plane (C planes) block dimensions */
int c_block_width;
int c_block_height;
DECLARE_ALIGNED(16, int16_t, encoded_block_levels)[6][7][256];
uint16_t *mb_type;
uint32_t *dummy;
int16_t (*motion_val8[3])[2];
int16_t (*motion_val16[3])[2];
int64_t rd_total;
uint8_t *scratchbuf;
int motion_est;
SVQ1EncDSPContext svq1encdsp;
} SVQ1EncContext;
static void svq1_write_header(SVQ1EncContext *s, PutBitContext *pb, int frame_type)
{
int i;
/* frame code */
put_bits(pb, 22, 0x20);
/* temporal reference (sure hope this is a "don't care") */
put_bits(pb, 8, 0x00);
/* frame type */
put_bits(pb, 2, frame_type - 1);
if (frame_type == AV_PICTURE_TYPE_I) {
/* no checksum since frame code is 0x20 */
/* no embedded string either */
/* output 5 unknown bits (2 + 2 + 1) */
put_bits(pb, 5, 2); /* 2 needed by quicktime decoder */
i = ff_match_2uint16((void*)ff_svq1_frame_size_table,
FF_ARRAY_ELEMS(ff_svq1_frame_size_table),
s->frame_width, s->frame_height);
put_bits(pb, 3, i);
if (i == 7) {
put_bits(pb, 12, s->frame_width);
put_bits(pb, 12, s->frame_height);
}
}
/* no checksum or extra data (next 2 bits get 0) */
put_bits(pb, 2, 0);
}
#define QUALITY_THRESHOLD 100
#define THRESHOLD_MULTIPLIER 0.6
static int ssd_int8_vs_int16_c(const int8_t *pix1, const int16_t *pix2,
intptr_t size)
{
int score = 0, i;
for (i = 0; i < size; i++)
score += (pix1[i] - pix2[i]) * (pix1[i] - pix2[i]);
return score;
}
static int encode_block(SVQ1EncContext *s, uint8_t *src, uint8_t *ref,
uint8_t *decoded, int stride, unsigned level,
int threshold, int lambda, int intra)
{
int count, y, x, i, j, split, best_mean, best_score, best_count;
int best_vector[6];
int block_sum[7] = { 0, 0, 0, 0, 0, 0 };
int w = 2 << (level + 2 >> 1);
int h = 2 << (level + 1 >> 1);
int size = w * h;
int16_t (*block)[256] = s->encoded_block_levels[level];
const int8_t *codebook_sum, *codebook;
const uint16_t(*mean_vlc)[2];
const uint8_t(*multistage_vlc)[2];
best_score = 0;
// FIXME: Optimize, this does not need to be done multiple times.
if (intra) {
// level is 5 when encode_block is called from svq1_encode_plane
// and always < 4 when called recursively from this function.
codebook_sum = level < 4 ? svq1_intra_codebook_sum[level] : NULL;
codebook = ff_svq1_intra_codebooks[level];
mean_vlc = ff_svq1_intra_mean_vlc;
multistage_vlc = ff_svq1_intra_multistage_vlc[level];
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
int v = src[x + y * stride];
block[0][x + w * y] = v;
best_score += v * v;
block_sum[0] += v;
}
}
} else {
// level is 5 or < 4, see above for details.
codebook_sum = level < 4 ? svq1_inter_codebook_sum[level] : NULL;
codebook = ff_svq1_inter_codebooks[level];
mean_vlc = ff_svq1_inter_mean_vlc + 256;
multistage_vlc = ff_svq1_inter_multistage_vlc[level];
for (y = 0; y < h; y++) {
for (x = 0; x < w; x++) {
int v = src[x + y * stride] - ref[x + y * stride];
block[0][x + w * y] = v;
best_score += v * v;
block_sum[0] += v;
}
}
}
best_count = 0;
best_score -= (int)((unsigned)block_sum[0] * block_sum[0] >> (level + 3));
best_mean = block_sum[0] + (size >> 1) >> (level + 3);
if (level < 4) {
for (count = 1; count < 7; count++) {
int best_vector_score = INT_MAX;
int best_vector_sum = -999, best_vector_mean = -999;
const int stage = count - 1;
const int8_t *vector;
for (i = 0; i < 16; i++) {
int sum = codebook_sum[stage * 16 + i];
int sqr, diff, score;
vector = codebook + stage * size * 16 + i * size;
sqr = s->svq1encdsp.ssd_int8_vs_int16(vector, block[stage], size);
diff = block_sum[stage] - sum;
score = sqr - (diff * (int64_t)diff >> (level + 3)); // FIXME: 64 bits slooow
if (score < best_vector_score) {
int mean = diff + (size >> 1) >> (level + 3);
av_assert2(mean > -300 && mean < 300);
mean = av_clip(mean, intra ? 0 : -256, 255);
best_vector_score = score;
best_vector[stage] = i;
best_vector_sum = sum;
best_vector_mean = mean;
}
}
av_assert0(best_vector_mean != -999);
vector = codebook + stage * size * 16 + best_vector[stage] * size;
for (j = 0; j < size; j++)
block[stage + 1][j] = block[stage][j] - vector[j];
block_sum[stage + 1] = block_sum[stage] - best_vector_sum;
best_vector_score += lambda *
(+1 + 4 * count +
multistage_vlc[1 + count][1]
+ mean_vlc[best_vector_mean][1]);
if (best_vector_score < best_score) {
best_score = best_vector_score;
best_count = count;
best_mean = best_vector_mean;
}
}
}
split = 0;
if (best_score > threshold && level) {
int score = 0;
int offset = level & 1 ? stride * h / 2 : w / 2;
PutBitContext backup[6];
for (i = level - 1; i >= 0; i--)
backup[i] = s->reorder_pb[i];
score += encode_block(s, src, ref, decoded, stride, level - 1,
threshold >> 1, lambda, intra);
score += encode_block(s, src + offset, ref + offset, decoded + offset,
stride, level - 1, threshold >> 1, lambda, intra);
score += lambda;
if (score < best_score) {
best_score = score;
split = 1;
} else {
for (i = level - 1; i >= 0; i--)
s->reorder_pb[i] = backup[i];
}
}
if (level > 0)
put_bits(&s->reorder_pb[level], 1, split);
if (!split) {
av_assert1(best_mean >= 0 && best_mean < 256 || !intra);
av_assert1(best_mean >= -256 && best_mean < 256);
av_assert1(best_count >= 0 && best_count < 7);
av_assert1(level < 4 || best_count == 0);
/* output the encoding */
put_bits(&s->reorder_pb[level],
multistage_vlc[1 + best_count][1],
multistage_vlc[1 + best_count][0]);
put_bits(&s->reorder_pb[level], mean_vlc[best_mean][1],
mean_vlc[best_mean][0]);
for (i = 0; i < best_count; i++) {
av_assert2(best_vector[i] >= 0 && best_vector[i] < 16);
put_bits(&s->reorder_pb[level], 4, best_vector[i]);
}
for (y = 0; y < h; y++)
for (x = 0; x < w; x++)
decoded[x + y * stride] = src[x + y * stride] -
block[best_count][x + w * y] +
best_mean;
}
return best_score;
}
static void init_block_index(MpegEncContext *s){
s->block_index[0]= s->b8_stride*(s->mb_y*2 ) + s->mb_x*2;
s->block_index[1]= s->b8_stride*(s->mb_y*2 ) + 1 + s->mb_x*2;
s->block_index[2]= s->b8_stride*(s->mb_y*2 + 1) + s->mb_x*2;
s->block_index[3]= s->b8_stride*(s->mb_y*2 + 1) + 1 + s->mb_x*2;
s->block_index[4]= s->mb_stride*(s->mb_y + 1) + s->b8_stride*s->mb_height*2 + s->mb_x;
s->block_index[5]= s->mb_stride*(s->mb_y + s->mb_height + 2) + s->b8_stride*s->mb_height*2 + s->mb_x;
}
static int svq1_encode_plane(SVQ1EncContext *s, int plane,
PutBitContext *pb,
const unsigned char *src_plane,
unsigned char *ref_plane,
unsigned char *decoded_plane,
int width, int height, int src_stride, int stride)
{
int x, y;
int i;
int block_width, block_height;
int level;
int threshold[6];
uint8_t *src = s->scratchbuf + stride * 32;
const int lambda = (s->quality * s->quality) >>
(2 * FF_LAMBDA_SHIFT);
/* figure out the acceptable level thresholds in advance */
threshold[5] = QUALITY_THRESHOLD;
for (level = 4; level >= 0; level--)
threshold[level] = threshold[level + 1] * THRESHOLD_MULTIPLIER;
block_width = (width + 15) / 16;
block_height = (height + 15) / 16;
if (s->pict_type == AV_PICTURE_TYPE_P) {
s->m.avctx = s->avctx;
s->m.current_picture_ptr = &s->m.current_picture;
s->m.last_picture_ptr = &s->m.last_picture;
s->m.last_picture.f->data[0] = ref_plane;
s->m.linesize =
s->m.last_picture.f->linesize[0] =
s->m.new_picture->linesize[0] =
s->m.current_picture.f->linesize[0] = stride;
s->m.width = width;
s->m.height = height;
s->m.mb_width = block_width;
s->m.mb_height = block_height;
s->m.mb_stride = s->m.mb_width + 1;
s->m.b8_stride = 2 * s->m.mb_width + 1;
s->m.f_code = 1;
s->m.pict_type = s->pict_type;
s->m.motion_est = s->motion_est;
s->m.me.scene_change_score = 0;
// s->m.out_format = FMT_H263;
// s->m.unrestricted_mv = 1;
s->m.lambda = s->quality;
s->m.qscale = s->m.lambda * 139 +
FF_LAMBDA_SCALE * 64 >>
FF_LAMBDA_SHIFT + 7;
s->m.lambda2 = s->m.lambda * s->m.lambda +
FF_LAMBDA_SCALE / 2 >>
FF_LAMBDA_SHIFT;
if (!s->motion_val8[plane]) {
s->motion_val8[plane] = av_mallocz((s->m.b8_stride *
block_height * 2 + 2) *
2 * sizeof(int16_t));
s->motion_val16[plane] = av_mallocz((s->m.mb_stride *
(block_height + 2) + 1) *
2 * sizeof(int16_t));
if (!s->motion_val8[plane] || !s->motion_val16[plane])
return AVERROR(ENOMEM);
}
s->m.mb_type = s->mb_type;
// dummies, to avoid segfaults
s->m.mb_mean = (uint8_t *)s->dummy;
s->m.mb_var = (uint16_t *)s->dummy;
s->m.mc_mb_var = (uint16_t *)s->dummy;
s->m.current_picture.mb_type = s->dummy;
s->m.current_picture.motion_val[0] = s->motion_val8[plane] + 2;
s->m.p_mv_table = s->motion_val16[plane] +
s->m.mb_stride + 1;
s->m.mecc = s->mecc; // move
ff_init_me(&s->m);
s->m.me.dia_size = s->avctx->dia_size;
s->m.first_slice_line = 1;
for (y = 0; y < block_height; y++) {
s->m.new_picture->data[0] = src - y * 16 * stride; // ugly
s->m.mb_y = y;
for (i = 0; i < 16 && i + 16 * y < height; i++) {
memcpy(&src[i * stride], &src_plane[(i + 16 * y) * src_stride],
width);
for (x = width; x < 16 * block_width; x++)
src[i * stride + x] = src[i * stride + x - 1];
}
for (; i < 16 && i + 16 * y < 16 * block_height; i++)
memcpy(&src[i * stride], &src[(i - 1) * stride],
16 * block_width);
for (x = 0; x < block_width; x++) {
s->m.mb_x = x;
init_block_index(&s->m);
ff_estimate_p_frame_motion(&s->m, x, y);
}
s->m.first_slice_line = 0;
}
ff_fix_long_p_mvs(&s->m, CANDIDATE_MB_TYPE_INTRA);
ff_fix_long_mvs(&s->m, NULL, 0, s->m.p_mv_table, s->m.f_code,
CANDIDATE_MB_TYPE_INTER, 0);
}
s->m.first_slice_line = 1;
for (y = 0; y < block_height; y++) {
for (i = 0; i < 16 && i + 16 * y < height; i++) {
memcpy(&src[i * stride], &src_plane[(i + 16 * y) * src_stride],
width);
for (x = width; x < 16 * block_width; x++)
src[i * stride + x] = src[i * stride + x - 1];
}
for (; i < 16 && i + 16 * y < 16 * block_height; i++)
memcpy(&src[i * stride], &src[(i - 1) * stride], 16 * block_width);
s->m.mb_y = y;
for (x = 0; x < block_width; x++) {
uint8_t reorder_buffer[2][6][7 * 32];
int count[2][6];
int offset = y * 16 * stride + x * 16;
uint8_t *decoded = decoded_plane + offset;
const uint8_t *ref = ref_plane + offset;
int score[4] = { 0, 0, 0, 0 }, best;
uint8_t *temp = s->scratchbuf;
if (put_bytes_left(pb, 0) < 3000) { // FIXME: check size
av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
return -1;
}
s->m.mb_x = x;
init_block_index(&s->m);
if (s->pict_type == AV_PICTURE_TYPE_I ||
(s->m.mb_type[x + y * s->m.mb_stride] &
CANDIDATE_MB_TYPE_INTRA)) {
for (i = 0; i < 6; i++)
init_put_bits(&s->reorder_pb[i], reorder_buffer[0][i],
7 * 32);
if (s->pict_type == AV_PICTURE_TYPE_P) {
put_bits(&s->reorder_pb[5], SVQ1_BLOCK_INTRA_LEN, SVQ1_BLOCK_INTRA_CODE);
score[0] = SVQ1_BLOCK_INTRA_LEN * lambda;
}
score[0] += encode_block(s, src + 16 * x, NULL, temp, stride,
5, 64, lambda, 1);
for (i = 0; i < 6; i++) {
count[0][i] = put_bits_count(&s->reorder_pb[i]);
flush_put_bits(&s->reorder_pb[i]);
}
} else
score[0] = INT_MAX;
best = 0;
if (s->pict_type == AV_PICTURE_TYPE_P) {
int mx, my, pred_x, pred_y, dxy;
int16_t *motion_ptr;
motion_ptr = ff_h263_pred_motion(&s->m, 0, 0, &pred_x, &pred_y);
if (s->m.mb_type[x + y * s->m.mb_stride] &
CANDIDATE_MB_TYPE_INTER) {
for (i = 0; i < 6; i++)
init_put_bits(&s->reorder_pb[i], reorder_buffer[1][i],
7 * 32);
put_bits(&s->reorder_pb[5], SVQ1_BLOCK_INTER_LEN, SVQ1_BLOCK_INTER_CODE);
s->m.pb = s->reorder_pb[5];
mx = motion_ptr[0];
my = motion_ptr[1];
av_assert1(mx >= -32 && mx <= 31);
av_assert1(my >= -32 && my <= 31);
av_assert1(pred_x >= -32 && pred_x <= 31);
av_assert1(pred_y >= -32 && pred_y <= 31);
ff_h263_encode_motion(&s->m.pb, mx - pred_x, 1);
ff_h263_encode_motion(&s->m.pb, my - pred_y, 1);
s->reorder_pb[5] = s->m.pb;
score[1] += lambda * put_bits_count(&s->reorder_pb[5]);
dxy = (mx & 1) + 2 * (my & 1);
s->hdsp.put_pixels_tab[0][dxy](temp + 16*stride,
ref + (mx >> 1) +
stride * (my >> 1),
stride, 16);
score[1] += encode_block(s, src + 16 * x, temp + 16*stride,
decoded, stride, 5, 64, lambda, 0);
best = score[1] <= score[0];
score[2] = s->mecc.sse[0](NULL, src + 16 * x, ref,
stride, 16);
score[2] += SVQ1_BLOCK_SKIP_LEN * lambda;
if (score[2] < score[best] && mx == 0 && my == 0) {
best = 2;
s->hdsp.put_pixels_tab[0][0](decoded, ref, stride, 16);
put_bits(pb, SVQ1_BLOCK_SKIP_LEN, SVQ1_BLOCK_SKIP_CODE);
}
}
if (best == 1) {
for (i = 0; i < 6; i++) {
count[1][i] = put_bits_count(&s->reorder_pb[i]);
flush_put_bits(&s->reorder_pb[i]);
}
} else {
motion_ptr[0] =
motion_ptr[1] =
motion_ptr[2] =
motion_ptr[3] =
motion_ptr[0 + 2 * s->m.b8_stride] =
motion_ptr[1 + 2 * s->m.b8_stride] =
motion_ptr[2 + 2 * s->m.b8_stride] =
motion_ptr[3 + 2 * s->m.b8_stride] = 0;
}
}
s->rd_total += score[best];
if (best != 2)
for (i = 5; i >= 0; i--)
ff_copy_bits(pb, reorder_buffer[best][i],
count[best][i]);
if (best == 0)
s->hdsp.put_pixels_tab[0][0](decoded, temp, stride, 16);
}
s->m.first_slice_line = 0;
}
return 0;
}
static av_cold int svq1_encode_end(AVCodecContext *avctx)
{
SVQ1EncContext *const s = avctx->priv_data;
int i;
if (avctx->frame_number)
av_log(avctx, AV_LOG_DEBUG, "RD: %f\n",
s->rd_total / (double)(avctx->width * avctx->height *
avctx->frame_number));
s->m.mb_type = NULL;
ff_mpv_common_end(&s->m);
av_freep(&s->m.me.scratchpad);
av_freep(&s->m.me.map);
av_freep(&s->m.me.score_map);
av_freep(&s->mb_type);
av_freep(&s->dummy);
av_freep(&s->scratchbuf);
for (i = 0; i < 3; i++) {
av_freep(&s->motion_val8[i]);
av_freep(&s->motion_val16[i]);
}
av_frame_free(&s->current_picture);
av_frame_free(&s->last_picture);
return 0;
}
static av_cold int svq1_encode_init(AVCodecContext *avctx)
{
SVQ1EncContext *const s = avctx->priv_data;
int ret;
if (avctx->width >= 4096 || avctx->height >= 4096) {
av_log(avctx, AV_LOG_ERROR, "Dimensions too large, maximum is 4095x4095\n");
return AVERROR(EINVAL);
}
ff_hpeldsp_init(&s->hdsp, avctx->flags);
ff_me_cmp_init(&s->mecc, avctx);
ff_mpegvideoencdsp_init(&s->m.mpvencdsp, avctx);
s->current_picture = av_frame_alloc();
s->last_picture = av_frame_alloc();
if (!s->current_picture || !s->last_picture) {
return AVERROR(ENOMEM);
}
s->frame_width = avctx->width;
s->frame_height = avctx->height;
s->y_block_width = (s->frame_width + 15) / 16;
s->y_block_height = (s->frame_height + 15) / 16;
s->c_block_width = (s->frame_width / 4 + 15) / 16;
s->c_block_height = (s->frame_height / 4 + 15) / 16;
s->avctx = avctx;
s->m.avctx = avctx;
if ((ret = ff_mpv_common_init(&s->m)) < 0) {
return ret;
}
s->m.picture_structure = PICT_FRAME;
s->m.me.temp =
s->m.me.scratchpad = av_mallocz((avctx->width + 64) *
2 * 16 * 2 * sizeof(uint8_t));
s->m.me.map = av_mallocz(ME_MAP_SIZE * sizeof(uint32_t));
s->m.me.score_map = av_mallocz(ME_MAP_SIZE * sizeof(uint32_t));
s->mb_type = av_mallocz((s->y_block_width + 1) *
s->y_block_height * sizeof(int16_t));
s->dummy = av_mallocz((s->y_block_width + 1) *
s->y_block_height * sizeof(int32_t));
s->svq1encdsp.ssd_int8_vs_int16 = ssd_int8_vs_int16_c;
if (!s->m.me.temp || !s->m.me.scratchpad || !s->m.me.map ||
!s->m.me.score_map || !s->mb_type || !s->dummy) {
return AVERROR(ENOMEM);
}
#if ARCH_PPC
ff_svq1enc_init_ppc(&s->svq1encdsp);
#elif ARCH_X86
ff_svq1enc_init_x86(&s->svq1encdsp);
#endif
ff_h263_encode_init(&s->m); // mv_penalty
return 0;
}
static int svq1_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{
SVQ1EncContext *const s = avctx->priv_data;
PutBitContext pb;
int i, ret;
ret = ff_alloc_packet(avctx, pkt, s->y_block_width * s->y_block_height *
MAX_MB_BYTES * 3 + AV_INPUT_BUFFER_MIN_SIZE);
if (ret < 0)
return ret;
if (avctx->pix_fmt != AV_PIX_FMT_YUV410P) {
av_log(avctx, AV_LOG_ERROR, "unsupported pixel format\n");
return -1;
}
if (!s->current_picture->data[0]) {
if ((ret = ff_encode_alloc_frame(avctx, s->current_picture)) < 0) {
return ret;
}
}
if (!s->last_picture->data[0]) {
ret = ff_encode_alloc_frame(avctx, s->last_picture);
if (ret < 0)
return ret;
}
if (!s->scratchbuf) {
s->scratchbuf = av_malloc_array(s->current_picture->linesize[0], 16 * 3);
if (!s->scratchbuf)
return AVERROR(ENOMEM);
}
FFSWAP(AVFrame*, s->current_picture, s->last_picture);
if (avctx->gop_size && (avctx->frame_number % avctx->gop_size))
s->pict_type = AV_PICTURE_TYPE_P;
else
s->pict_type = AV_PICTURE_TYPE_I;
s->quality = pict->quality;
ff_side_data_set_encoder_stats(pkt, pict->quality, NULL, 0, s->pict_type);
init_put_bits(&pb, pkt->data, pkt->size);
svq1_write_header(s, &pb, s->pict_type);
for (i = 0; i < 3; i++) {
int ret = svq1_encode_plane(s, i, &pb,
pict->data[i],
s->last_picture->data[i],
s->current_picture->data[i],
s->frame_width / (i ? 4 : 1),
s->frame_height / (i ? 4 : 1),
pict->linesize[i],
s->current_picture->linesize[i]);
emms_c();
if (ret < 0) {
int j;
for (j = 0; j < i; j++) {
av_freep(&s->motion_val8[j]);
av_freep(&s->motion_val16[j]);
}
av_freep(&s->scratchbuf);
return -1;
}
}
// align_put_bits(&pb);
while (put_bits_count(&pb) & 31)
put_bits(&pb, 1, 0);
flush_put_bits(&pb);
pkt->size = put_bytes_output(&pb);
if (s->pict_type == AV_PICTURE_TYPE_I)
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
return 0;
}
#define OFFSET(x) offsetof(struct SVQ1EncContext, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "motion-est", "Motion estimation algorithm", OFFSET(motion_est), AV_OPT_TYPE_INT, { .i64 = FF_ME_EPZS }, FF_ME_ZERO, FF_ME_XONE, VE, "motion-est"},
{ "zero", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FF_ME_ZERO }, 0, 0, FF_MPV_OPT_FLAGS, "motion-est" },
{ "epzs", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FF_ME_EPZS }, 0, 0, FF_MPV_OPT_FLAGS, "motion-est" },
{ "xone", NULL, 0, AV_OPT_TYPE_CONST, { .i64 = FF_ME_XONE }, 0, 0, FF_MPV_OPT_FLAGS, "motion-est" },
{ NULL },
};
static const AVClass svq1enc_class = {
.class_name = "svq1enc",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const FFCodec ff_svq1_encoder = {
.p.name = "svq1",
CODEC_LONG_NAME("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_SVQ1,
.p.capabilities = AV_CODEC_CAP_DR1,
.priv_data_size = sizeof(SVQ1EncContext),
.p.priv_class = &svq1enc_class,
.init = svq1_encode_init,
FF_CODEC_ENCODE_CB(svq1_encode_frame),
.close = svq1_encode_end,
.p.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV410P,
AV_PIX_FMT_NONE },
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
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