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ffmpeg/libavcodec/svq1enc.c
Diego Biurrun 63a46c6101 svq1: Drop a bunch of useless parentheses
2012-10-10 15:10:53 +02:00

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/*
* SVQ1 Encoder
* Copyright (C) 2004 Mike Melanson <melanson@pcisys.net>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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 "dsputil.h"
#include "mpegvideo.h"
#include "h263.h"
#include "internal.h"
#include "svq1.h"
#include "svq1enc_cb.h"
#undef NDEBUG
#include <assert.h>
typedef struct SVQ1Context {
/* 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;
DSPContext dsp;
AVFrame picture;
AVFrame current_picture;
AVFrame last_picture;
PutBitContext pb;
GetBitContext gb;
/* 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;
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;
} SVQ1Context;
static void svq1_write_header(SVQ1Context *s, int frame_type)
{
int i;
/* frame code */
put_bits(&s->pb, 22, 0x20);
/* temporal reference (sure hope this is a "don't care") */
put_bits(&s->pb, 8, 0x00);
/* frame type */
put_bits(&s->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(&s->pb, 5, 2); /* 2 needed by quicktime decoder */
i = ff_match_2uint16(ff_svq1_frame_size_table,
FF_ARRAY_ELEMS(ff_svq1_frame_size_table),
s->frame_width, s->frame_height);
put_bits(&s->pb, 3, i);
if (i == 7) {
put_bits(&s->pb, 12, s->frame_width);
put_bits(&s->pb, 12, s->frame_height);
}
}
/* no checksum or extra data (next 2 bits get 0) */
put_bits(&s->pb, 2, 0);
}
#define QUALITY_THRESHOLD 100
#define THRESHOLD_MULTIPLIER 0.6
static int encode_block(SVQ1Context *s, uint8_t *src, uint8_t *ref,
uint8_t *decoded, int stride, int 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[7][256];
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) {
codebook_sum = svq1_intra_codebook_sum[level];
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 {
codebook_sum = svq1_inter_codebook_sum[level];
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->dsp.ssd_int8_vs_int16(vector, block[stage], size);
diff = block_sum[stage] - sum;
score = sqr - (diff * (int64_t)diff >> (level + 3)); // FIXME: 64bit slooow
if (score < best_vector_score) {
int mean = diff + (size >> 1) >> (level + 3);
assert(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;
}
}
assert(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) {
assert(best_mean >= 0 && best_mean < 256 || !intra);
assert(best_mean >= -256 && best_mean < 256);
assert(best_count >= 0 && best_count < 7);
assert(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++) {
assert(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 int svq1_encode_plane(SVQ1Context *s, int plane,
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 * 16;
const int lambda = (s->picture.quality * s->picture.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->picture.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.f.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->picture.pict_type;
s->m.me_method = s->avctx->me_method;
s->m.me.scene_change_score = 0;
s->m.flags = s->avctx->flags;
// s->m.out_format = FMT_H263;
// s->m.unrestricted_mv = 1;
s->m.lambda = s->picture.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));
}
s->m.mb_type = s->mb_type;
// dummies, to avoid segfaults
s->m.current_picture.mb_mean = (uint8_t *)s->dummy;
s->m.current_picture.mb_var = (uint16_t *)s->dummy;
s->m.current_picture.mc_mb_var = (uint16_t *)s->dummy;
s->m.current_picture.f.mb_type = s->dummy;
s->m.current_picture.f.motion_val[0] = s->motion_val8[plane] + 2;
s->m.p_mv_table = s->motion_val16[plane] +
s->m.mb_stride + 1;
s->m.dsp = s->dsp; // 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.f.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;
ff_init_block_index(&s->m);
ff_update_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);
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[3][6][7 * 32];
int count[3][6];
int offset = y * 16 * stride + x * 16;
uint8_t *decoded = decoded_plane + offset;
uint8_t *ref = ref_plane + offset;
int score[4] = { 0, 0, 0, 0 }, best;
uint8_t *temp = s->scratchbuf;
if (s->pb.buf_end - s->pb.buf -
(put_bits_count(&s->pb) >> 3) < 3000) { // FIXME: check size
av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
return -1;
}
s->m.mb_x = x;
ff_init_block_index(&s->m);
ff_update_block_index(&s->m);
if (s->picture.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->picture.pict_type == AV_PICTURE_TYPE_P) {
const uint8_t *vlc = ff_svq1_block_type_vlc[SVQ1_BLOCK_INTRA];
put_bits(&s->reorder_pb[5], vlc[1], vlc[0]);
score[0] = vlc[1] * 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->picture.pict_type == AV_PICTURE_TYPE_P) {
const uint8_t *vlc = ff_svq1_block_type_vlc[SVQ1_BLOCK_INTER];
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], vlc[1], vlc[0]);
s->m.pb = s->reorder_pb[5];
mx = motion_ptr[0];
my = motion_ptr[1];
assert(mx >= -32 && mx <= 31);
assert(my >= -32 && my <= 31);
assert(pred_x >= -32 && pred_x <= 31);
assert(pred_y >= -32 && pred_y <= 31);
ff_h263_encode_motion(&s->m, mx - pred_x, 1);
ff_h263_encode_motion(&s->m, 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->dsp.put_pixels_tab[0][dxy](temp + 16,
ref + (mx >> 1) +
stride * (my >> 1),
stride, 16);
score[1] += encode_block(s, src + 16 * x, temp + 16,
decoded, stride, 5, 64, lambda, 0);
best = score[1] <= score[0];
vlc = ff_svq1_block_type_vlc[SVQ1_BLOCK_SKIP];
score[2] = s->dsp.sse[0](NULL, src + 16 * x, ref,
stride, 16);
score[2] += vlc[1] * lambda;
if (score[2] < score[best] && mx == 0 && my == 0) {
best = 2;
s->dsp.put_pixels_tab[0][0](decoded, ref, stride, 16);
for (i = 0; i < 6; i++)
count[2][i] = 0;
put_bits(&s->pb, vlc[1], vlc[0]);
}
}
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];
for (i = 5; i >= 0; i--)
avpriv_copy_bits(&s->pb, reorder_buffer[best][i],
count[best][i]);
if (best == 0)
s->dsp.put_pixels_tab[0][0](decoded, temp, stride, 16);
}
s->m.first_slice_line = 0;
}
return 0;
}
static av_cold int svq1_encode_init(AVCodecContext *avctx)
{
SVQ1Context *const s = avctx->priv_data;
ff_dsputil_init(&s->dsp, avctx);
avctx->coded_frame = &s->picture;
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;
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));
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)
{
SVQ1Context *const s = avctx->priv_data;
AVFrame *const p = &s->picture;
AVFrame temp;
int i, ret;
if (!pkt->data &&
(ret = av_new_packet(pkt, s->y_block_width * s->y_block_height *
MAX_MB_BYTES * 3 + FF_MIN_BUFFER_SIZE) < 0)) {
av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
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]) {
avctx->get_buffer(avctx, &s->current_picture);
avctx->get_buffer(avctx, &s->last_picture);
s->scratchbuf = av_malloc(s->current_picture.linesize[0] * 16 * 2);
}
temp = s->current_picture;
s->current_picture = s->last_picture;
s->last_picture = temp;
init_put_bits(&s->pb, pkt->data, pkt->size);
*p = *pict;
p->pict_type = avctx->gop_size && avctx->frame_number % avctx->gop_size ?
AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
p->key_frame = p->pict_type == AV_PICTURE_TYPE_I;
svq1_write_header(s, p->pict_type);
for (i = 0; i < 3; i++)
if (svq1_encode_plane(s, i,
s->picture.data[i],
s->last_picture.data[i],
s->current_picture.data[i],
s->frame_width / (i ? 4 : 1),
s->frame_height / (i ? 4 : 1),
s->picture.linesize[i],
s->current_picture.linesize[i]) < 0)
return -1;
// avpriv_align_put_bits(&s->pb);
while (put_bits_count(&s->pb) & 31)
put_bits(&s->pb, 1, 0);
flush_put_bits(&s->pb);
pkt->size = put_bits_count(&s->pb) / 8;
if (p->pict_type == AV_PICTURE_TYPE_I)
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
return 0;
}
static av_cold int svq1_encode_end(AVCodecContext *avctx)
{
SVQ1Context *const s = avctx->priv_data;
int i;
av_log(avctx, AV_LOG_DEBUG, "RD: %f\n",
s->rd_total / (double)(avctx->width * avctx->height *
avctx->frame_number));
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]);
}
return 0;
}
AVCodec ff_svq1_encoder = {
.name = "svq1",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_SVQ1,
.priv_data_size = sizeof(SVQ1Context),
.init = svq1_encode_init,
.encode2 = svq1_encode_frame,
.close = svq1_encode_end,
.pix_fmts = (const enum PixelFormat[]) { AV_PIX_FMT_YUV410P,
AV_PIX_FMT_NONE },
.long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"),
};
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