345 lines
10 KiB
C
345 lines
10 KiB
C
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/*
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* Copyright (c) 2003 Michael Niedermayer
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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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* ASUS V1/V2 decoder.
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*/
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#include "libavutil/attributes.h"
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#include "libavutil/mem.h"
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#include "asv.h"
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#include "avcodec.h"
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#include "blockdsp.h"
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#include "idctdsp.h"
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#include "internal.h"
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#include "mathops.h"
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#include "mpeg12data.h"
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#define VLC_BITS 6
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#define ASV2_LEVEL_VLC_BITS 10
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static VLC ccp_vlc;
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static VLC level_vlc;
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static VLC dc_ccp_vlc;
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static VLC ac_ccp_vlc;
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static VLC asv2_level_vlc;
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static av_cold void init_vlcs(ASV1Context *a)
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{
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static int done = 0;
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if (!done) {
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done = 1;
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INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
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&ff_asv_ccp_tab[0][1], 2, 1,
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&ff_asv_ccp_tab[0][0], 2, 1, 64);
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INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
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&ff_asv_dc_ccp_tab[0][1], 2, 1,
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&ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
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INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
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&ff_asv_ac_ccp_tab[0][1], 2, 1,
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&ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
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INIT_VLC_STATIC(&level_vlc, VLC_BITS, 7,
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&ff_asv_level_tab[0][1], 2, 1,
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&ff_asv_level_tab[0][0], 2, 1, 64);
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INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
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&ff_asv2_level_tab[0][1], 2, 1,
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&ff_asv2_level_tab[0][0], 2, 1, 1024);
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}
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}
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// FIXME write a reversed bitstream reader to avoid the double reverse
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static inline int asv2_get_bits(GetBitContext *gb, int n)
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{
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return ff_reverse[get_bits(gb, n) << (8 - n)];
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}
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static inline int asv1_get_level(GetBitContext *gb)
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{
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int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
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if (code == 3)
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return get_sbits(gb, 8);
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else
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return code - 3;
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}
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static inline int asv2_get_level(GetBitContext *gb)
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{
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int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
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if (code == 31)
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return (int8_t) asv2_get_bits(gb, 8);
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else
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return code - 31;
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}
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static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
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{
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int i;
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block[0] = 8 * get_bits(&a->gb, 8);
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for (i = 0; i < 11; i++) {
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const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
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if (ccp) {
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if (ccp == 16)
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break;
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if (ccp < 0 || i >= 10) {
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av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
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return AVERROR_INVALIDDATA;
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}
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if (ccp & 8)
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block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
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if (ccp & 4)
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block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
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if (ccp & 2)
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block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
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if (ccp & 1)
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block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
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}
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}
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return 0;
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}
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static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
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{
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int i, count, ccp;
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count = asv2_get_bits(&a->gb, 4);
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block[0] = 8 * asv2_get_bits(&a->gb, 8);
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ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
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if (ccp) {
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if (ccp & 4)
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block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
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if (ccp & 2)
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block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
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if (ccp & 1)
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block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
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}
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for (i = 1; i < count + 1; i++) {
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const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
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if (ccp) {
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if (ccp & 8)
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block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
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if (ccp & 4)
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block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
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if (ccp & 2)
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block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
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if (ccp & 1)
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block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
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}
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}
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return 0;
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}
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static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
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{
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int i, ret;
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a->bdsp.clear_blocks(block[0]);
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if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
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for (i = 0; i < 6; i++) {
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if ((ret = asv1_decode_block(a, block[i])) < 0)
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return ret;
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}
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} else {
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for (i = 0; i < 6; i++) {
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if ((ret = asv2_decode_block(a, block[i])) < 0)
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return ret;
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}
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}
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return 0;
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}
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static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
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{
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int16_t(*block)[64] = a->block;
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int linesize = frame->linesize[0];
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uint8_t *dest_y = frame->data[0] + (mb_y * 16 * linesize) + mb_x * 16;
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uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
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uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
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a->idsp.idct_put(dest_y, linesize, block[0]);
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a->idsp.idct_put(dest_y + 8, linesize, block[1]);
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a->idsp.idct_put(dest_y + 8 * linesize, linesize, block[2]);
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a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
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if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) {
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a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
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a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
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}
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}
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static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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ASV1Context *const a = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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AVFrame *const p = data;
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int mb_x, mb_y, ret;
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if (buf_size * 8LL < a->mb_height * a->mb_width * 13LL)
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return AVERROR_INVALIDDATA;
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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return ret;
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p->pict_type = AV_PICTURE_TYPE_I;
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p->key_frame = 1;
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av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
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buf_size);
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if (!a->bitstream_buffer)
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return AVERROR(ENOMEM);
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if (avctx->codec_id == AV_CODEC_ID_ASV1) {
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a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,
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(const uint32_t *) buf, buf_size / 4);
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} else {
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int i;
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for (i = 0; i < buf_size; i++)
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a->bitstream_buffer[i] = ff_reverse[buf[i]];
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}
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init_get_bits(&a->gb, a->bitstream_buffer, buf_size * 8);
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for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
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for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
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if ((ret = decode_mb(a, a->block)) < 0)
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return ret;
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idct_put(a, p, mb_x, mb_y);
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}
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}
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if (a->mb_width2 != a->mb_width) {
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mb_x = a->mb_width2;
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for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
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if ((ret = decode_mb(a, a->block)) < 0)
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return ret;
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idct_put(a, p, mb_x, mb_y);
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}
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}
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if (a->mb_height2 != a->mb_height) {
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mb_y = a->mb_height2;
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for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
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if ((ret = decode_mb(a, a->block)) < 0)
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return ret;
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idct_put(a, p, mb_x, mb_y);
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}
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}
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*got_frame = 1;
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emms_c();
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return (get_bits_count(&a->gb) + 31) / 32 * 4;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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ASV1Context *const a = avctx->priv_data;
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const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
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int i;
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if (avctx->extradata_size < 1) {
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av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");
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}
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ff_asv_common_init(avctx);
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ff_blockdsp_init(&a->bdsp, avctx);
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ff_idctdsp_init(&a->idsp, avctx);
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init_vlcs(a);
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ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab);
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {
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av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
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if (avctx->codec_id == AV_CODEC_ID_ASV1)
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a->inv_qscale = 6;
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else
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a->inv_qscale = 10;
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}
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for (i = 0; i < 64; i++) {
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int index = ff_asv_scantab[i];
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a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] /
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a->inv_qscale;
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}
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return 0;
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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ASV1Context *const a = avctx->priv_data;
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av_freep(&a->bitstream_buffer);
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a->bitstream_buffer_size = 0;
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return 0;
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}
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#if CONFIG_ASV1_DECODER
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AVCodec ff_asv1_decoder = {
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.name = "asv1",
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.long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_ASV1,
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.priv_data_size = sizeof(ASV1Context),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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#endif
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#if CONFIG_ASV2_DECODER
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AVCodec ff_asv2_decoder = {
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.name = "asv2",
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.long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_ASV2,
|
||
|
|
.priv_data_size = sizeof(ASV1Context),
|
||
|
|
.init = decode_init,
|
||
|
|
.close = decode_end,
|
||
|
|
.decode = decode_frame,
|
||
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
||
|
|
};
|
||
|
|
#endif
|