238 lines
7.3 KiB
C
238 lines
7.3 KiB
C
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/*
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* Copyright (c) 2002 The FFmpeg Project
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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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#include "avcodec.h"
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#include "h263.h"
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#include "mpegvideo.h"
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#include "msmpeg4.h"
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#include "msmpeg4data.h"
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#include "wmv2.h"
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static int encode_ext_header(Wmv2Context *w)
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{
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MpegEncContext *const s = &w->s;
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PutBitContext pb;
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int code;
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init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
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put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); // yes 29.97 -> 29
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put_bits(&pb, 11, FFMIN(s->bit_rate / 1024, 2047));
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put_bits(&pb, 1, w->mspel_bit = 1);
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put_bits(&pb, 1, s->loop_filter);
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put_bits(&pb, 1, w->abt_flag = 1);
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put_bits(&pb, 1, w->j_type_bit = 1);
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put_bits(&pb, 1, w->top_left_mv_flag = 0);
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put_bits(&pb, 1, w->per_mb_rl_bit = 1);
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put_bits(&pb, 3, code = 1);
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flush_put_bits(&pb);
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s->slice_height = s->mb_height / code;
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return 0;
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}
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static av_cold int wmv2_encode_init(AVCodecContext *avctx)
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{
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Wmv2Context *const w = avctx->priv_data;
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if (ff_mpv_encode_init(avctx) < 0)
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return -1;
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ff_wmv2_common_init(w);
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avctx->extradata_size = 4;
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avctx->extradata = av_mallocz(avctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!avctx->extradata)
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return AVERROR(ENOMEM);
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encode_ext_header(w);
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return 0;
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}
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int ff_wmv2_encode_picture_header(MpegEncContext *s, int picture_number)
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{
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Wmv2Context *const w = (Wmv2Context *) s;
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put_bits(&s->pb, 1, s->pict_type - 1);
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if (s->pict_type == AV_PICTURE_TYPE_I)
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put_bits(&s->pb, 7, 0);
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put_bits(&s->pb, 5, s->qscale);
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s->dc_table_index = 1;
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s->mv_table_index = 1; /* only if P-frame */
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s->per_mb_rl_table = 0;
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s->mspel = 0;
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w->per_mb_abt = 0;
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w->abt_type = 0;
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w->j_type = 0;
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av_assert0(s->flipflop_rounding);
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if (s->pict_type == AV_PICTURE_TYPE_I) {
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av_assert0(s->no_rounding == 1);
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if (w->j_type_bit)
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put_bits(&s->pb, 1, w->j_type);
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if (w->per_mb_rl_bit)
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put_bits(&s->pb, 1, s->per_mb_rl_table);
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if (!s->per_mb_rl_table) {
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ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
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ff_msmpeg4_code012(&s->pb, s->rl_table_index);
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}
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put_bits(&s->pb, 1, s->dc_table_index);
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s->inter_intra_pred = 0;
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} else {
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int cbp_index;
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put_bits(&s->pb, 2, SKIP_TYPE_NONE);
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ff_msmpeg4_code012(&s->pb, cbp_index = 0);
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w->cbp_table_index = wmv2_get_cbp_table_index(s, cbp_index);
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if (w->mspel_bit)
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put_bits(&s->pb, 1, s->mspel);
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if (w->abt_flag) {
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put_bits(&s->pb, 1, w->per_mb_abt ^ 1);
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if (!w->per_mb_abt)
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ff_msmpeg4_code012(&s->pb, w->abt_type);
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}
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if (w->per_mb_rl_bit)
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put_bits(&s->pb, 1, s->per_mb_rl_table);
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if (!s->per_mb_rl_table) {
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ff_msmpeg4_code012(&s->pb, s->rl_table_index);
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s->rl_chroma_table_index = s->rl_table_index;
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}
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put_bits(&s->pb, 1, s->dc_table_index);
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put_bits(&s->pb, 1, s->mv_table_index);
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s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
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}
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s->esc3_level_length = 0;
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s->esc3_run_length = 0;
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return 0;
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}
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/* Nearly identical to wmv1 but that is just because we do not use the
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* useless M$ crap features. It is duplicated here in case someone wants
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* to add support for these crap features. */
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void ff_wmv2_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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Wmv2Context *const w = (Wmv2Context *) s;
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int cbp, coded_cbp, i;
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int pred_x, pred_y;
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uint8_t *coded_block;
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ff_msmpeg4_handle_slices(s);
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if (!s->mb_intra) {
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/* compute 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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put_bits(&s->pb,
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ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
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ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
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s->misc_bits += get_bits_diff(s);
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/* motion vector */
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ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
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ff_msmpeg4_encode_motion(s, motion_x - pred_x,
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motion_y - pred_y);
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s->mv_bits += get_bits_diff(s);
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} else {
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/* compute cbp */
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cbp = 0;
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coded_cbp = 0;
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for (i = 0; i < 6; i++) {
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int val, pred;
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val = (s->block_last_index[i] >= 1);
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cbp |= val << (5 - i);
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if (i < 4) {
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/* predict value for close blocks only for luma */
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pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
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*coded_block = val;
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val = val ^ pred;
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}
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coded_cbp |= val << (5 - i);
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}
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if (s->pict_type == AV_PICTURE_TYPE_I)
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put_bits(&s->pb,
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ff_msmp4_mb_i_table[coded_cbp][1],
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ff_msmp4_mb_i_table[coded_cbp][0]);
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else
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put_bits(&s->pb,
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ff_wmv2_inter_table[w->cbp_table_index][cbp][1],
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ff_wmv2_inter_table[w->cbp_table_index][cbp][0]);
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put_bits(&s->pb, 1, 0); /* no AC prediction yet */
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if (s->inter_intra_pred) {
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s->h263_aic_dir = 0;
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put_bits(&s->pb,
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ff_table_inter_intra[s->h263_aic_dir][1],
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ff_table_inter_intra[s->h263_aic_dir][0]);
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}
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s->misc_bits += get_bits_diff(s);
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}
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for (i = 0; i < 6; i++)
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ff_msmpeg4_encode_block(s, block[i], i);
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if (s->mb_intra)
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s->i_tex_bits += get_bits_diff(s);
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else
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s->p_tex_bits += get_bits_diff(s);
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}
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static const AVClass wmv2_class = {
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.class_name = "wmv2 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_wmv2_encoder = {
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.name = "wmv2",
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.long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_WMV2,
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.priv_data_size = sizeof(Wmv2Context),
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.priv_class = &wmv2_class,
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.init = wmv2_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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};
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