2007-05-21 12:51:29 +00:00
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/*
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* H261 encoder
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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* Copyright (c) 2004 Maarten Daniels
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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2010-04-20 14:45:34 +00:00
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* @file
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2007-05-21 12:51:29 +00:00
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* H.261 encoder.
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*/
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2013-02-01 09:31:59 +00:00
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#include "libavutil/attributes.h"
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2012-06-07 19:32:32 +00:00
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#include "libavutil/avassert.h"
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2007-05-21 12:51:29 +00:00
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#include "avcodec.h"
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2014-02-28 12:40:54 +00:00
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#include "mpegutils.h"
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2007-05-21 12:51:29 +00:00
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#include "mpegvideo.h"
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2010-02-06 12:53:28 +00:00
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#include "h263.h"
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2007-05-21 12:51:29 +00:00
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#include "h261.h"
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2015-05-29 18:44:03 +00:00
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#include "mpegvideodata.h"
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2007-05-21 12:51:29 +00:00
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2013-11-17 14:05:51 +00:00
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static uint8_t uni_h261_rl_len [64*64*2*2];
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#define UNI_ENC_INDEX(last,run,level) ((last)*128*64 + (run)*128 + (level))
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2013-04-04 12:31:58 +00:00
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int ff_h261_get_picture_format(int width, int height)
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{
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2007-05-21 12:51:29 +00:00
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// QCIF
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if (width == 176 && height == 144)
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return 0;
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// CIF
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else if (width == 352 && height == 288)
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return 1;
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// ERROR
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else
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2015-01-31 18:49:57 +00:00
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return AVERROR(EINVAL);
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2007-05-21 12:51:29 +00:00
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}
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2013-04-04 12:31:58 +00:00
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void ff_h261_encode_picture_header(MpegEncContext *s, int picture_number)
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{
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H261Context *h = (H261Context *)s;
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2007-05-21 12:51:29 +00:00
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int format, temp_ref;
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2011-10-17 08:10:42 +00:00
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avpriv_align_put_bits(&s->pb);
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2007-05-21 12:51:29 +00:00
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/* Update the pointer to last GOB */
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2009-04-13 16:59:38 +00:00
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s->ptr_lastgob = put_bits_ptr(&s->pb);
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2007-05-21 12:51:29 +00:00
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put_bits(&s->pb, 20, 0x10); /* PSC */
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2015-02-01 18:13:38 +00:00
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temp_ref = s->picture_number * 30000LL * s->avctx->time_base.num /
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(1001LL * s->avctx->time_base.den); // FIXME maybe this should use a timestamp
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2008-07-13 14:27:48 +00:00
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put_sbits(&s->pb, 5, temp_ref); /* TemporalReference */
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2007-05-21 12:51:29 +00:00
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put_bits(&s->pb, 1, 0); /* split screen off */
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put_bits(&s->pb, 1, 0); /* camera off */
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put_bits(&s->pb, 1, 0); /* freeze picture release off */
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format = ff_h261_get_picture_format(s->width, s->height);
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put_bits(&s->pb, 1, format); /* 0 == QCIF, 1 == CIF */
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put_bits(&s->pb, 1, 0); /* still image mode */
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put_bits(&s->pb, 1, 0); /* reserved */
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put_bits(&s->pb, 1, 0); /* no PEI */
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2013-04-04 12:31:58 +00:00
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if (format == 0)
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2007-05-21 12:51:29 +00:00
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h->gob_number = -1;
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else
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h->gob_number = 0;
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2013-11-20 14:11:21 +00:00
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s->mb_skip_run = 0;
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2007-05-21 12:51:29 +00:00
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}
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/**
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2010-06-30 15:38:06 +00:00
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* Encode a group of blocks header.
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2007-05-21 12:51:29 +00:00
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*/
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2013-04-04 12:31:58 +00:00
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static void h261_encode_gob_header(MpegEncContext *s, int mb_line)
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{
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H261Context *h = (H261Context *)s;
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if (ff_h261_get_picture_format(s->width, s->height) == 0) {
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h->gob_number += 2; // QCIF
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} else {
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h->gob_number++; // CIF
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2007-05-21 12:51:29 +00:00
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}
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2013-04-04 12:31:58 +00:00
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put_bits(&s->pb, 16, 1); /* GBSC */
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2007-05-21 12:51:29 +00:00
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put_bits(&s->pb, 4, h->gob_number); /* GN */
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2013-04-04 12:31:58 +00:00
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put_bits(&s->pb, 5, s->qscale); /* GQUANT */
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put_bits(&s->pb, 1, 0); /* no GEI */
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2013-11-20 14:11:21 +00:00
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s->mb_skip_run = 0;
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2013-11-20 14:28:46 +00:00
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s->last_mv[0][0][0] = 0;
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s->last_mv[0][0][1] = 0;
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2007-05-21 12:51:29 +00:00
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}
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2013-04-04 12:31:58 +00:00
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void ff_h261_reorder_mb_index(MpegEncContext *s)
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{
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int index = s->mb_x + s->mb_y * s->mb_width;
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2007-05-21 12:51:29 +00:00
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2013-11-20 14:11:21 +00:00
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if (index % 11 == 0) {
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if (index % 33 == 0)
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h261_encode_gob_header(s, 0);
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2013-11-20 14:28:46 +00:00
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s->last_mv[0][0][0] = 0;
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s->last_mv[0][0][1] = 0;
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2013-11-20 14:11:21 +00:00
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}
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2007-05-21 12:51:29 +00:00
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/* for CIF the GOB's are fragmented in the middle of a scanline
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2013-04-04 12:31:58 +00:00
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* that's why we need to adjust the x and y index of the macroblocks */
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if (ff_h261_get_picture_format(s->width, s->height) == 1) { // CIF
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s->mb_x = index % 11;
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index /= 11;
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s->mb_y = index % 3;
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index /= 3;
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s->mb_x += 11 * (index % 2);
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index /= 2;
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s->mb_y += 3 * index;
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2007-05-21 12:51:29 +00:00
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ff_init_block_index(s);
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ff_update_block_index(s);
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}
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}
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2013-04-04 12:31:58 +00:00
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static void h261_encode_motion(H261Context *h, int val)
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{
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MpegEncContext *const s = &h->s;
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2007-05-21 12:51:29 +00:00
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int sign, code;
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2013-04-04 12:31:58 +00:00
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if (val == 0) {
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2007-05-21 12:51:29 +00:00
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code = 0;
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2013-04-05 19:53:57 +00:00
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put_bits(&s->pb, ff_h261_mv_tab[code][1], ff_h261_mv_tab[code][0]);
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2013-04-04 12:31:58 +00:00
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} else {
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if (val > 15)
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val -= 32;
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if (val < -16)
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val += 32;
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2007-05-21 12:51:29 +00:00
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sign = val < 0;
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code = sign ? -val : val;
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2013-04-05 19:53:57 +00:00
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put_bits(&s->pb, ff_h261_mv_tab[code][1], ff_h261_mv_tab[code][0]);
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2013-04-04 12:31:58 +00:00
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put_bits(&s->pb, 1, sign);
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2007-05-21 12:51:29 +00:00
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}
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}
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2013-04-04 12:31:58 +00:00
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static inline int get_cbp(MpegEncContext *s, int16_t block[6][64])
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2007-05-21 12:51:29 +00:00
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{
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int i, cbp;
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2013-04-04 12:31:58 +00:00
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cbp = 0;
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for (i = 0; i < 6; i++)
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2007-05-21 12:51:29 +00:00
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if (s->block_last_index[i] >= 0)
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cbp |= 1 << (5 - i);
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return cbp;
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}
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2013-04-04 12:31:58 +00:00
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2013-04-04 12:33:55 +00:00
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/**
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* Encode an 8x8 block.
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* @param block the 8x8 block
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* @param n block index (0-3 are luma, 4-5 are chroma)
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*/
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static void h261_encode_block(H261Context *h, int16_t *block, int n)
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{
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MpegEncContext *const s = &h->s;
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int level, run, i, j, last_index, last_non_zero, sign, slevel, code;
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RLTable *rl;
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2013-04-05 20:00:38 +00:00
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rl = &ff_h261_rl_tcoeff;
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2013-04-04 12:33:55 +00:00
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if (s->mb_intra) {
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/* DC coef */
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level = block[0];
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/* 255 cannot be represented, so we clamp */
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if (level > 254) {
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level = 254;
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block[0] = 254;
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}
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/* 0 cannot be represented also */
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else if (level < 1) {
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level = 1;
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block[0] = 1;
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}
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if (level == 128)
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put_bits(&s->pb, 8, 0xff);
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else
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put_bits(&s->pb, 8, level);
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i = 1;
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} else if ((block[0] == 1 || block[0] == -1) &&
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(s->block_last_index[n] > -1)) {
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// special case
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put_bits(&s->pb, 2, block[0] > 0 ? 2 : 3);
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i = 1;
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} else {
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i = 0;
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}
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/* AC coefs */
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last_index = s->block_last_index[n];
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last_non_zero = i - 1;
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for (; i <= last_index; i++) {
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j = s->intra_scantable.permutated[i];
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level = block[j];
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if (level) {
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run = i - last_non_zero - 1;
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sign = 0;
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slevel = level;
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if (level < 0) {
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sign = 1;
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level = -level;
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}
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code = get_rl_index(rl, 0 /*no last in H.261, EOB is used*/,
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run, level);
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if (run == 0 && level < 16)
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code += 1;
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put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
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if (code == rl->n) {
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put_bits(&s->pb, 6, run);
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2013-04-05 20:00:38 +00:00
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av_assert1(slevel != 0);
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av_assert1(level <= 127);
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2013-04-04 12:33:55 +00:00
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put_sbits(&s->pb, 8, slevel);
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} else {
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put_bits(&s->pb, 1, sign);
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}
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last_non_zero = i;
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}
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}
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if (last_index > -1)
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put_bits(&s->pb, rl->table_vlc[0][1], rl->table_vlc[0][0]); // EOB
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}
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2013-04-04 12:31:58 +00:00
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void ff_h261_encode_mb(MpegEncContext *s, int16_t block[6][64],
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int motion_x, int motion_y)
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2007-05-21 12:51:29 +00:00
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{
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2013-04-04 12:31:58 +00:00
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H261Context *h = (H261Context *)s;
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2007-05-21 12:51:29 +00:00
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int mvd, mv_diff_x, mv_diff_y, i, cbp;
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cbp = 63; // avoid warning
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mvd = 0;
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h->mtype = 0;
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2013-04-04 12:31:58 +00:00
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if (!s->mb_intra) {
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2007-05-21 12:51:29 +00:00
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/* compute cbp */
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2013-04-04 12:31:58 +00:00
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cbp = get_cbp(s, block);
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2007-05-21 12:51:29 +00:00
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/* mvd indicates if this block is motion compensated */
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mvd = motion_x | motion_y;
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2015-01-31 03:57:50 +00:00
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if ((cbp | mvd) == 0) {
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2007-05-21 12:51:29 +00:00
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/* skip macroblock */
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s->skip_count++;
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2013-11-20 14:11:21 +00:00
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s->mb_skip_run++;
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2013-11-20 14:28:46 +00:00
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s->last_mv[0][0][0] = 0;
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s->last_mv[0][0][1] = 0;
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2015-01-31 03:57:50 +00:00
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s->qscale -= s->dquant;
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2007-05-21 12:51:29 +00:00
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return;
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}
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}
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/* MB is not skipped, encode MBA */
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2013-04-04 12:56:01 +00:00
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put_bits(&s->pb,
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2013-11-20 14:11:21 +00:00
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ff_h261_mba_bits[s->mb_skip_run],
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ff_h261_mba_code[s->mb_skip_run]);
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s->mb_skip_run = 0;
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2007-05-21 12:51:29 +00:00
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/* calculate MTYPE */
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2013-04-04 12:31:58 +00:00
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if (!s->mb_intra) {
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2007-05-21 12:51:29 +00:00
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h->mtype++;
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2013-04-04 12:31:58 +00:00
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if (mvd || s->loop_filter)
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h->mtype += 3;
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if (s->loop_filter)
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h->mtype += 3;
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2015-01-31 03:57:50 +00:00
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if (cbp)
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2007-05-21 12:51:29 +00:00
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h->mtype++;
|
2012-06-07 19:32:32 +00:00
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av_assert1(h->mtype > 1);
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2007-05-21 12:51:29 +00:00
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}
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2015-01-31 03:57:50 +00:00
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if (s->dquant && cbp) {
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2007-05-21 12:51:29 +00:00
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h->mtype++;
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2015-01-31 03:57:50 +00:00
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} else
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s->qscale -= s->dquant;
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2007-05-21 12:51:29 +00:00
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2013-04-04 12:56:01 +00:00
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put_bits(&s->pb,
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ff_h261_mtype_bits[h->mtype],
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ff_h261_mtype_code[h->mtype]);
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2007-05-21 12:51:29 +00:00
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2012-04-10 21:13:59 +00:00
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h->mtype = ff_h261_mtype_map[h->mtype];
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2007-05-21 12:51:29 +00:00
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2013-04-04 12:31:58 +00:00
|
|
|
if (IS_QUANT(h->mtype)) {
|
|
|
|
ff_set_qscale(s, s->qscale + s->dquant);
|
2007-05-21 12:51:29 +00:00
|
|
|
put_bits(&s->pb, 5, s->qscale);
|
|
|
|
}
|
|
|
|
|
2013-04-04 12:31:58 +00:00
|
|
|
if (IS_16X16(h->mtype)) {
|
2013-11-20 14:28:46 +00:00
|
|
|
mv_diff_x = (motion_x >> 1) - s->last_mv[0][0][0];
|
|
|
|
mv_diff_y = (motion_y >> 1) - s->last_mv[0][0][1];
|
|
|
|
s->last_mv[0][0][0] = (motion_x >> 1);
|
|
|
|
s->last_mv[0][0][1] = (motion_y >> 1);
|
2013-04-04 12:31:58 +00:00
|
|
|
h261_encode_motion(h, mv_diff_x);
|
|
|
|
h261_encode_motion(h, mv_diff_y);
|
2007-05-21 12:51:29 +00:00
|
|
|
}
|
|
|
|
|
2013-04-04 12:31:58 +00:00
|
|
|
if (HAS_CBP(h->mtype)) {
|
2013-04-05 19:53:57 +00:00
|
|
|
av_assert1(cbp > 0);
|
2013-04-04 12:56:01 +00:00
|
|
|
put_bits(&s->pb,
|
|
|
|
ff_h261_cbp_tab[cbp - 1][1],
|
|
|
|
ff_h261_cbp_tab[cbp - 1][0]);
|
2007-05-21 12:51:29 +00:00
|
|
|
}
|
2013-04-04 12:31:58 +00:00
|
|
|
for (i = 0; i < 6; i++)
|
2007-05-21 12:51:29 +00:00
|
|
|
/* encode each block */
|
|
|
|
h261_encode_block(h, block[i], i);
|
|
|
|
|
2013-11-20 14:11:21 +00:00
|
|
|
if (!IS_16X16(h->mtype)) {
|
2013-11-20 14:28:46 +00:00
|
|
|
s->last_mv[0][0][0] = 0;
|
|
|
|
s->last_mv[0][0][1] = 0;
|
2007-05-21 12:51:29 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-11-17 14:05:51 +00:00
|
|
|
static av_cold void init_uni_h261_rl_tab(RLTable *rl, uint32_t *bits_tab,
|
|
|
|
uint8_t *len_tab)
|
|
|
|
{
|
|
|
|
int slevel, run, last;
|
|
|
|
|
|
|
|
av_assert0(MAX_LEVEL >= 64);
|
|
|
|
av_assert0(MAX_RUN >= 63);
|
|
|
|
|
|
|
|
for(slevel=-64; slevel<64; slevel++){
|
|
|
|
if(slevel==0) continue;
|
|
|
|
for(run=0; run<64; run++){
|
|
|
|
for(last=0; last<=1; last++){
|
|
|
|
const int index= UNI_ENC_INDEX(last, run, slevel+64);
|
|
|
|
int level= slevel < 0 ? -slevel : slevel;
|
2013-11-18 09:04:17 +00:00
|
|
|
int len, code;
|
2013-11-17 14:05:51 +00:00
|
|
|
|
|
|
|
len_tab[index]= 100;
|
|
|
|
|
|
|
|
/* ESC0 */
|
|
|
|
code= get_rl_index(rl, 0, run, level);
|
|
|
|
len= rl->table_vlc[code][1] + 1;
|
|
|
|
if(last)
|
|
|
|
len += 2;
|
|
|
|
|
|
|
|
if(code!=rl->n && len < len_tab[index]){
|
|
|
|
len_tab [index]= len;
|
|
|
|
}
|
|
|
|
/* ESC */
|
|
|
|
len = rl->table_vlc[rl->n][1];
|
|
|
|
if(last)
|
|
|
|
len += 2;
|
|
|
|
|
|
|
|
if(len < len_tab[index]){
|
|
|
|
len_tab [index]= len;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2013-02-01 09:31:59 +00:00
|
|
|
av_cold void ff_h261_encode_init(MpegEncContext *s)
|
2013-04-04 12:31:58 +00:00
|
|
|
{
|
2013-04-05 21:43:31 +00:00
|
|
|
ff_h261_common_init();
|
2007-05-21 12:51:29 +00:00
|
|
|
|
2013-04-04 12:31:58 +00:00
|
|
|
s->min_qcoeff = -127;
|
|
|
|
s->max_qcoeff = 127;
|
|
|
|
s->y_dc_scale_table =
|
|
|
|
s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
|
2013-11-17 14:05:51 +00:00
|
|
|
s->ac_esc_length = 6+6+8;
|
|
|
|
|
|
|
|
init_uni_h261_rl_tab(&ff_h261_rl_tcoeff, NULL, uni_h261_rl_len);
|
|
|
|
|
|
|
|
s->intra_ac_vlc_length = s->inter_ac_vlc_length = uni_h261_rl_len;
|
|
|
|
s->intra_ac_vlc_last_length = s->inter_ac_vlc_last_length = uni_h261_rl_len + 128*64;
|
2007-05-21 12:51:29 +00:00
|
|
|
}
|
|
|
|
|
2015-06-10 13:29:07 +00:00
|
|
|
static const AVClass h261_class = {
|
|
|
|
.class_name = "h261 encoder",
|
|
|
|
.item_name = av_default_item_name,
|
|
|
|
.option = ff_mpv_generic_options,
|
|
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
|
|
};
|
2012-02-27 11:12:19 +00:00
|
|
|
|
2011-01-25 21:40:11 +00:00
|
|
|
AVCodec ff_h261_encoder = {
|
2011-07-17 10:54:31 +00:00
|
|
|
.name = "h261",
|
2013-10-03 20:57:53 +00:00
|
|
|
.long_name = NULL_IF_CONFIG_SMALL("H.261"),
|
2011-07-17 10:54:31 +00:00
|
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
2012-08-05 09:11:04 +00:00
|
|
|
.id = AV_CODEC_ID_H261,
|
2011-07-17 10:54:31 +00:00
|
|
|
.priv_data_size = sizeof(H261Context),
|
2014-08-10 15:25:12 +00:00
|
|
|
.init = ff_mpv_encode_init,
|
|
|
|
.encode2 = ff_mpv_encode_picture,
|
|
|
|
.close = ff_mpv_encode_end,
|
2013-04-04 12:31:58 +00:00
|
|
|
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
|
|
|
|
AV_PIX_FMT_NONE },
|
2012-02-27 11:12:19 +00:00
|
|
|
.priv_class = &h261_class,
|
2007-05-21 12:51:29 +00:00
|
|
|
};
|