mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
ee77140afa
* commit 'b2bed9325dbd6be0da1d91ffed3f513c40274fd2': cosmetics: Group .name and .long_name together in codec/format declarations Conflicts: libavcodec/8svx.c libavcodec/alac.c libavcodec/cljr.c libavcodec/dnxhddec.c libavcodec/dnxhdenc.c libavcodec/dpxenc.c libavcodec/dvdec.c libavcodec/dvdsubdec.c libavcodec/dvdsubenc.c libavcodec/ffv1dec.c libavcodec/flacdec.c libavcodec/flvdec.c libavcodec/fraps.c libavcodec/frwu.c libavcodec/g726.c libavcodec/gif.c libavcodec/gifdec.c libavcodec/h261dec.c libavcodec/h263dec.c libavcodec/iff.c libavcodec/imc.c libavcodec/libopencore-amr.c libavcodec/libopenjpegdec.c libavcodec/libopenjpegenc.c libavcodec/libspeexenc.c libavcodec/libvo-amrwbenc.c libavcodec/libvorbisenc.c libavcodec/libvpxenc.c libavcodec/libx264.c libavcodec/libxavs.c libavcodec/libxvid.c libavcodec/ljpegenc.c libavcodec/mjpegbdec.c libavcodec/mjpegdec.c libavcodec/mpeg12dec.c libavcodec/mpeg4videodec.c libavcodec/msmpeg4dec.c libavcodec/pgssubdec.c libavcodec/pngdec.c libavcodec/pngenc.c libavcodec/proresdec_lgpl.c libavcodec/proresenc_kostya.c libavcodec/ra144enc.c libavcodec/rawdec.c libavcodec/rv10.c libavcodec/sp5xdec.c libavcodec/takdec.c libavcodec/tta.c libavcodec/v210dec.c libavcodec/vp6.c libavcodec/wavpack.c libavcodec/xbmenc.c libavcodec/yop.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
341 lines
9.5 KiB
C
341 lines
9.5 KiB
C
/*
|
|
* H261 encoder
|
|
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
|
|
* Copyright (c) 2004 Maarten Daniels
|
|
*
|
|
* 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
|
|
* H.261 encoder.
|
|
*/
|
|
|
|
#include "libavutil/attributes.h"
|
|
#include "libavutil/avassert.h"
|
|
#include "avcodec.h"
|
|
#include "mpegvideo.h"
|
|
#include "h263.h"
|
|
#include "h261.h"
|
|
|
|
int ff_h261_get_picture_format(int width, int height)
|
|
{
|
|
// QCIF
|
|
if (width == 176 && height == 144)
|
|
return 0;
|
|
// CIF
|
|
else if (width == 352 && height == 288)
|
|
return 1;
|
|
// ERROR
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
void ff_h261_encode_picture_header(MpegEncContext *s, int picture_number)
|
|
{
|
|
H261Context *h = (H261Context *)s;
|
|
int format, temp_ref;
|
|
|
|
avpriv_align_put_bits(&s->pb);
|
|
|
|
/* Update the pointer to last GOB */
|
|
s->ptr_lastgob = put_bits_ptr(&s->pb);
|
|
|
|
put_bits(&s->pb, 20, 0x10); /* PSC */
|
|
|
|
temp_ref = s->picture_number * (int64_t)30000 * s->avctx->time_base.num /
|
|
(1001 * (int64_t)s->avctx->time_base.den); // FIXME maybe this should use a timestamp
|
|
put_sbits(&s->pb, 5, temp_ref); /* TemporalReference */
|
|
|
|
put_bits(&s->pb, 1, 0); /* split screen off */
|
|
put_bits(&s->pb, 1, 0); /* camera off */
|
|
put_bits(&s->pb, 1, 0); /* freeze picture release off */
|
|
|
|
format = ff_h261_get_picture_format(s->width, s->height);
|
|
|
|
put_bits(&s->pb, 1, format); /* 0 == QCIF, 1 == CIF */
|
|
|
|
put_bits(&s->pb, 1, 0); /* still image mode */
|
|
put_bits(&s->pb, 1, 0); /* reserved */
|
|
|
|
put_bits(&s->pb, 1, 0); /* no PEI */
|
|
if (format == 0)
|
|
h->gob_number = -1;
|
|
else
|
|
h->gob_number = 0;
|
|
h->current_mba = 0;
|
|
}
|
|
|
|
/**
|
|
* Encode a group of blocks header.
|
|
*/
|
|
static void h261_encode_gob_header(MpegEncContext *s, int mb_line)
|
|
{
|
|
H261Context *h = (H261Context *)s;
|
|
if (ff_h261_get_picture_format(s->width, s->height) == 0) {
|
|
h->gob_number += 2; // QCIF
|
|
} else {
|
|
h->gob_number++; // CIF
|
|
}
|
|
put_bits(&s->pb, 16, 1); /* GBSC */
|
|
put_bits(&s->pb, 4, h->gob_number); /* GN */
|
|
put_bits(&s->pb, 5, s->qscale); /* GQUANT */
|
|
put_bits(&s->pb, 1, 0); /* no GEI */
|
|
h->current_mba = 0;
|
|
h->previous_mba = 0;
|
|
h->current_mv_x = 0;
|
|
h->current_mv_y = 0;
|
|
}
|
|
|
|
void ff_h261_reorder_mb_index(MpegEncContext *s)
|
|
{
|
|
int index = s->mb_x + s->mb_y * s->mb_width;
|
|
|
|
if (index % 33 == 0)
|
|
h261_encode_gob_header(s, 0);
|
|
|
|
/* for CIF the GOB's are fragmented in the middle of a scanline
|
|
* that's why we need to adjust the x and y index of the macroblocks */
|
|
if (ff_h261_get_picture_format(s->width, s->height) == 1) { // CIF
|
|
s->mb_x = index % 11;
|
|
index /= 11;
|
|
s->mb_y = index % 3;
|
|
index /= 3;
|
|
s->mb_x += 11 * (index % 2);
|
|
index /= 2;
|
|
s->mb_y += 3 * index;
|
|
|
|
ff_init_block_index(s);
|
|
ff_update_block_index(s);
|
|
}
|
|
}
|
|
|
|
static void h261_encode_motion(H261Context *h, int val)
|
|
{
|
|
MpegEncContext *const s = &h->s;
|
|
int sign, code;
|
|
if (val == 0) {
|
|
code = 0;
|
|
put_bits(&s->pb, ff_h261_mv_tab[code][1], ff_h261_mv_tab[code][0]);
|
|
} else {
|
|
if (val > 15)
|
|
val -= 32;
|
|
if (val < -16)
|
|
val += 32;
|
|
sign = val < 0;
|
|
code = sign ? -val : val;
|
|
put_bits(&s->pb, ff_h261_mv_tab[code][1], ff_h261_mv_tab[code][0]);
|
|
put_bits(&s->pb, 1, sign);
|
|
}
|
|
}
|
|
|
|
static inline int get_cbp(MpegEncContext *s, int16_t block[6][64])
|
|
{
|
|
int i, cbp;
|
|
cbp = 0;
|
|
for (i = 0; i < 6; i++)
|
|
if (s->block_last_index[i] >= 0)
|
|
cbp |= 1 << (5 - i);
|
|
return cbp;
|
|
}
|
|
|
|
/**
|
|
* Encode an 8x8 block.
|
|
* @param block the 8x8 block
|
|
* @param n block index (0-3 are luma, 4-5 are chroma)
|
|
*/
|
|
static void h261_encode_block(H261Context *h, int16_t *block, int n)
|
|
{
|
|
MpegEncContext *const s = &h->s;
|
|
int level, run, i, j, last_index, last_non_zero, sign, slevel, code;
|
|
RLTable *rl;
|
|
|
|
rl = &ff_h261_rl_tcoeff;
|
|
if (s->mb_intra) {
|
|
/* DC coef */
|
|
level = block[0];
|
|
/* 255 cannot be represented, so we clamp */
|
|
if (level > 254) {
|
|
level = 254;
|
|
block[0] = 254;
|
|
}
|
|
/* 0 cannot be represented also */
|
|
else if (level < 1) {
|
|
level = 1;
|
|
block[0] = 1;
|
|
}
|
|
if (level == 128)
|
|
put_bits(&s->pb, 8, 0xff);
|
|
else
|
|
put_bits(&s->pb, 8, level);
|
|
i = 1;
|
|
} else if ((block[0] == 1 || block[0] == -1) &&
|
|
(s->block_last_index[n] > -1)) {
|
|
// special case
|
|
put_bits(&s->pb, 2, block[0] > 0 ? 2 : 3);
|
|
i = 1;
|
|
} else {
|
|
i = 0;
|
|
}
|
|
|
|
/* AC coefs */
|
|
last_index = s->block_last_index[n];
|
|
last_non_zero = i - 1;
|
|
for (; i <= last_index; i++) {
|
|
j = s->intra_scantable.permutated[i];
|
|
level = block[j];
|
|
if (level) {
|
|
run = i - last_non_zero - 1;
|
|
sign = 0;
|
|
slevel = level;
|
|
if (level < 0) {
|
|
sign = 1;
|
|
level = -level;
|
|
}
|
|
code = get_rl_index(rl, 0 /*no last in H.261, EOB is used*/,
|
|
run, level);
|
|
if (run == 0 && level < 16)
|
|
code += 1;
|
|
put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
|
|
if (code == rl->n) {
|
|
put_bits(&s->pb, 6, run);
|
|
av_assert1(slevel != 0);
|
|
av_assert1(level <= 127);
|
|
put_sbits(&s->pb, 8, slevel);
|
|
} else {
|
|
put_bits(&s->pb, 1, sign);
|
|
}
|
|
last_non_zero = i;
|
|
}
|
|
}
|
|
if (last_index > -1)
|
|
put_bits(&s->pb, rl->table_vlc[0][1], rl->table_vlc[0][0]); // EOB
|
|
}
|
|
|
|
void ff_h261_encode_mb(MpegEncContext *s, int16_t block[6][64],
|
|
int motion_x, int motion_y)
|
|
{
|
|
H261Context *h = (H261Context *)s;
|
|
int mvd, mv_diff_x, mv_diff_y, i, cbp;
|
|
cbp = 63; // avoid warning
|
|
mvd = 0;
|
|
|
|
h->current_mba++;
|
|
h->mtype = 0;
|
|
|
|
if (!s->mb_intra) {
|
|
/* compute cbp */
|
|
cbp = get_cbp(s, block);
|
|
|
|
/* mvd indicates if this block is motion compensated */
|
|
mvd = motion_x | motion_y;
|
|
|
|
if ((cbp | mvd | s->dquant) == 0) {
|
|
/* skip macroblock */
|
|
s->skip_count++;
|
|
h->current_mv_x = 0;
|
|
h->current_mv_y = 0;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/* MB is not skipped, encode MBA */
|
|
put_bits(&s->pb,
|
|
ff_h261_mba_bits[(h->current_mba - h->previous_mba) - 1],
|
|
ff_h261_mba_code[(h->current_mba - h->previous_mba) - 1]);
|
|
|
|
/* calculate MTYPE */
|
|
if (!s->mb_intra) {
|
|
h->mtype++;
|
|
|
|
if (mvd || s->loop_filter)
|
|
h->mtype += 3;
|
|
if (s->loop_filter)
|
|
h->mtype += 3;
|
|
if (cbp || s->dquant)
|
|
h->mtype++;
|
|
av_assert1(h->mtype > 1);
|
|
}
|
|
|
|
if (s->dquant)
|
|
h->mtype++;
|
|
|
|
put_bits(&s->pb,
|
|
ff_h261_mtype_bits[h->mtype],
|
|
ff_h261_mtype_code[h->mtype]);
|
|
|
|
h->mtype = ff_h261_mtype_map[h->mtype];
|
|
|
|
if (IS_QUANT(h->mtype)) {
|
|
ff_set_qscale(s, s->qscale + s->dquant);
|
|
put_bits(&s->pb, 5, s->qscale);
|
|
}
|
|
|
|
if (IS_16X16(h->mtype)) {
|
|
mv_diff_x = (motion_x >> 1) - h->current_mv_x;
|
|
mv_diff_y = (motion_y >> 1) - h->current_mv_y;
|
|
h->current_mv_x = (motion_x >> 1);
|
|
h->current_mv_y = (motion_y >> 1);
|
|
h261_encode_motion(h, mv_diff_x);
|
|
h261_encode_motion(h, mv_diff_y);
|
|
}
|
|
|
|
h->previous_mba = h->current_mba;
|
|
|
|
if (HAS_CBP(h->mtype)) {
|
|
av_assert1(cbp > 0);
|
|
put_bits(&s->pb,
|
|
ff_h261_cbp_tab[cbp - 1][1],
|
|
ff_h261_cbp_tab[cbp - 1][0]);
|
|
}
|
|
for (i = 0; i < 6; i++)
|
|
/* encode each block */
|
|
h261_encode_block(h, block[i], i);
|
|
|
|
if ((h->current_mba == 11) || (h->current_mba == 22) ||
|
|
(h->current_mba == 33) || (!IS_16X16(h->mtype))) {
|
|
h->current_mv_x = 0;
|
|
h->current_mv_y = 0;
|
|
}
|
|
}
|
|
|
|
av_cold void ff_h261_encode_init(MpegEncContext *s)
|
|
{
|
|
ff_h261_common_init();
|
|
|
|
s->min_qcoeff = -127;
|
|
s->max_qcoeff = 127;
|
|
s->y_dc_scale_table =
|
|
s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
|
|
}
|
|
|
|
FF_MPV_GENERIC_CLASS(h261)
|
|
|
|
AVCodec ff_h261_encoder = {
|
|
.name = "h261",
|
|
.long_name = NULL_IF_CONFIG_SMALL("H.261"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_H261,
|
|
.priv_data_size = sizeof(H261Context),
|
|
.init = ff_MPV_encode_init,
|
|
.encode2 = ff_MPV_encode_picture,
|
|
.close = ff_MPV_encode_end,
|
|
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
|
|
AV_PIX_FMT_NONE },
|
|
.priv_class = &h261_class,
|
|
};
|