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402 lines
11 KiB
C
Executable File
402 lines
11 KiB
C
Executable File
/*
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* H.261 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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* @file
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* H.261 encoder.
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*/
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#include "libavutil/attributes.h"
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#include "libavutil/avassert.h"
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#include "avcodec.h"
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#include "mpegutils.h"
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#include "mpegvideo.h"
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#include "h263.h"
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#include "h261.h"
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#include "mpegvideodata.h"
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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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int ff_h261_get_picture_format(int width, int height)
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{
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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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return AVERROR(EINVAL);
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}
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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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int format, temp_ref;
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avpriv_align_put_bits(&s->pb);
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/* Update the pointer to last GOB */
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s->ptr_lastgob = put_bits_ptr(&s->pb);
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put_bits(&s->pb, 20, 0x10); /* PSC */
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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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put_sbits(&s->pb, 5, temp_ref); /* TemporalReference */
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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, s->pict_type == AV_PICTURE_TYPE_I); /* freeze picture release on/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, 1); /* still image mode */
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put_bits(&s->pb, 1, 1); /* reserved */
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put_bits(&s->pb, 1, 0); /* no PEI */
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if (format == 0)
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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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s->mb_skip_run = 0;
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}
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/**
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* Encode a group of blocks header.
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*/
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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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}
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put_bits(&s->pb, 16, 1); /* GBSC */
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put_bits(&s->pb, 4, h->gob_number); /* GN */
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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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s->mb_skip_run = 0;
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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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}
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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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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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s->last_mv[0][0][0] = 0;
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s->last_mv[0][0][1] = 0;
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}
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/* for CIF the GOB's are fragmented in the middle of a scanline
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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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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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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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int sign, code;
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if (val == 0) {
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code = 0;
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put_bits(&s->pb, ff_h261_mv_tab[code][1], ff_h261_mv_tab[code][0]);
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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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sign = val < 0;
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code = sign ? -val : val;
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put_bits(&s->pb, ff_h261_mv_tab[code][1], ff_h261_mv_tab[code][0]);
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put_bits(&s->pb, 1, sign);
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}
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}
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static inline int get_cbp(MpegEncContext *s, int16_t block[6][64])
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{
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int i, cbp;
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cbp = 0;
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for (i = 0; i < 6; i++)
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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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/**
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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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rl = &ff_h261_rl_tcoeff;
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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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av_assert1(slevel != 0);
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av_assert1(level <= 127);
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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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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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{
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H261Context *h = (H261Context *)s;
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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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if (!s->mb_intra) {
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/* compute cbp */
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cbp = get_cbp(s, block);
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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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if ((cbp | mvd) == 0) {
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/* skip macroblock */
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s->skip_count++;
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s->mb_skip_run++;
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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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s->qscale -= s->dquant;
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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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put_bits(&s->pb,
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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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/* calculate MTYPE */
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if (!s->mb_intra) {
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h->mtype++;
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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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if (cbp)
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h->mtype++;
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av_assert1(h->mtype > 1);
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}
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if (s->dquant && cbp) {
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h->mtype++;
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} else
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s->qscale -= s->dquant;
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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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h->mtype = ff_h261_mtype_map[h->mtype];
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if (IS_QUANT(h->mtype)) {
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ff_set_qscale(s, s->qscale + s->dquant);
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put_bits(&s->pb, 5, s->qscale);
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}
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if (IS_16X16(h->mtype)) {
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mv_diff_x = (motion_x >> 1) - s->last_mv[0][0][0];
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mv_diff_y = (motion_y >> 1) - s->last_mv[0][0][1];
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s->last_mv[0][0][0] = (motion_x >> 1);
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s->last_mv[0][0][1] = (motion_y >> 1);
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h261_encode_motion(h, mv_diff_x);
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h261_encode_motion(h, mv_diff_y);
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}
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if (HAS_CBP(h->mtype)) {
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av_assert1(cbp > 0);
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put_bits(&s->pb,
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ff_h261_cbp_tab[cbp - 1][1],
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ff_h261_cbp_tab[cbp - 1][0]);
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}
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for (i = 0; i < 6; i++)
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/* encode each block */
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h261_encode_block(h, block[i], i);
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if (!IS_16X16(h->mtype)) {
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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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}
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}
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static av_cold void init_uni_h261_rl_tab(RLTable *rl, uint32_t *bits_tab,
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uint8_t *len_tab)
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{
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int slevel, run, last;
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av_assert0(MAX_LEVEL >= 64);
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av_assert0(MAX_RUN >= 63);
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for(slevel=-64; slevel<64; slevel++){
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if(slevel==0) continue;
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for(run=0; run<64; run++){
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for(last=0; last<=1; last++){
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const int index= UNI_ENC_INDEX(last, run, slevel+64);
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int level= slevel < 0 ? -slevel : slevel;
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int len, code;
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len_tab[index]= 100;
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/* ESC0 */
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code= get_rl_index(rl, 0, run, level);
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len= rl->table_vlc[code][1] + 1;
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if(last)
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len += 2;
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if(code!=rl->n && len < len_tab[index]){
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len_tab [index]= len;
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}
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/* ESC */
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len = rl->table_vlc[rl->n][1];
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if(last)
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len += 2;
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if(len < len_tab[index]){
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len_tab [index]= len;
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}
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}
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}
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}
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}
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av_cold void ff_h261_encode_init(MpegEncContext *s)
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{
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ff_h261_common_init();
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s->min_qcoeff = -127;
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s->max_qcoeff = 127;
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s->y_dc_scale_table =
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s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
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s->ac_esc_length = 6+6+8;
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init_uni_h261_rl_tab(&ff_h261_rl_tcoeff, NULL, uni_h261_rl_len);
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s->intra_ac_vlc_length = s->inter_ac_vlc_length = uni_h261_rl_len;
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s->intra_ac_vlc_last_length = s->inter_ac_vlc_last_length = uni_h261_rl_len + 128*64;
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}
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static const AVClass h261_class = {
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.class_name = "h261 encoder",
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.item_name = av_default_item_name,
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.option = ff_mpv_generic_options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVCodec ff_h261_encoder = {
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.name = "h261",
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.long_name = NULL_IF_CONFIG_SMALL("H.261"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_H261,
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.priv_data_size = sizeof(H261Context),
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.init = ff_mpv_encode_init,
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.encode2 = ff_mpv_encode_picture,
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.close = ff_mpv_encode_end,
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.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
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.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
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AV_PIX_FMT_NONE },
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.priv_class = &h261_class,
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};
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