/* * Copyright (c) 2003 Michael Niedermayer * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * ASUS V1/V2 decoder. */ #include "libavutil/attributes.h"#include "libavutil/mem.h"#include "libavutil/mem_internal.h"#include "libavutil/thread.h" #include "asv.h"#include "avcodec.h"#include "blockdsp.h"#include "codec_internal.h"#include "config_components.h"#include "decode.h"#include "get_bits.h"#include "idctdsp.h"#include "mpeg12data.h"#include "vlc.h" #define CCP_VLC_BITS         5#define DC_CCP_VLC_BITS      4#define AC_CCP_VLC_BITS      6#define ASV1_LEVEL_VLC_BITS  4#define ASV2_LEVEL_VLC_BITS 10 static VLCElem ccp_vlc[32];static VLCElem level_vlc[16];static VLCElem dc_ccp_vlc[16];static VLCElem ac_ccp_vlc[64];static VLCElem asv2_level_vlc[1024]; typedef struct ASVDecContext {    ASVCommonContext c;     GetBitContext gb;     BlockDSPContext bdsp;    IDCTDSPContext idsp;    uint8_t permutated_scantable[64];    DECLARE_ALIGNED(32, int16_t, block)[6][64];    uint16_t intra_matrix[64];    uint8_t *bitstream_buffer;    unsigned int bitstream_buffer_size;} ASVDecContext; static av_cold void init_vlcs(void){    VLC_INIT_STATIC_TABLE(ccp_vlc, CCP_VLC_BITS, 17,                          &ff_asv_ccp_tab[0][1], 2, 1,                          &ff_asv_ccp_tab[0][0], 2, 1, 0);    VLC_INIT_STATIC_TABLE(dc_ccp_vlc, DC_CCP_VLC_BITS, 8,                          &ff_asv_dc_ccp_tab[0][1], 2, 1,                          &ff_asv_dc_ccp_tab[0][0], 2, 1, VLC_INIT_LE);    VLC_INIT_STATIC_TABLE(ac_ccp_vlc, AC_CCP_VLC_BITS, 16,                          &ff_asv_ac_ccp_tab[0][1], 2, 1,                          &ff_asv_ac_ccp_tab[0][0], 2, 1, VLC_INIT_LE);    VLC_INIT_STATIC_TABLE(level_vlc, ASV1_LEVEL_VLC_BITS, 7,                          &ff_asv_level_tab[0][1], 2, 1,                          &ff_asv_level_tab[0][0], 2, 1, 0);    VLC_INIT_STATIC_TABLE(asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,                          &ff_asv2_level_tab[0][1], 4, 2,                          &ff_asv2_level_tab[0][0], 4, 2, VLC_INIT_LE);} static inline int asv1_get_level(GetBitContext *gb){    int code = get_vlc2(gb, level_vlc, ASV1_LEVEL_VLC_BITS, 1);     if (code == 3)        return get_sbits(gb, 8);    else        return code - 3;} // get_vlc2() is big-endian in this filestatic inline int asv2_get_vlc2(GetBitContext *gb, const VLCElem *table, int bits){    unsigned int index;    int code, n;     OPEN_READER(re, gb);    UPDATE_CACHE_LE(re, gb);     index = SHOW_UBITS_LE(re, gb, bits);    code  = table[index].sym;    n     = table[index].len;    LAST_SKIP_BITS(re, gb, n);     CLOSE_READER(re, gb);     return code;} static inline int asv2_get_level(GetBitContext *gb){    int code = asv2_get_vlc2(gb, asv2_level_vlc, ASV2_LEVEL_VLC_BITS);     if (code == 31)        return (int8_t) get_bits_le(gb, 8);    else        return code - 31;} static inline int asv1_decode_block(ASVDecContext *a, int16_t block[64]){    int i;     block[0] = 8 * get_bits(&a->gb, 8);     for (i = 0; i < 11; i++) {        const int ccp = get_vlc2(&a->gb, ccp_vlc, CCP_VLC_BITS, 1);         if (ccp) {            if (ccp == 16)                break;            if (ccp < 0 || i >= 10) {                av_log(a->c.avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");                return AVERROR_INVALIDDATA;            }             if (ccp & 8)                block[a->permutated_scantable[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;            if (ccp & 4)                block[a->permutated_scantable[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;            if (ccp & 2)                block[a->permutated_scantable[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;            if (ccp & 1)                block[a->permutated_scantable[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;        }    }     return 0;} static inline int asv2_decode_block(ASVDecContext *a, int16_t block[64]){    int i, count, ccp;     count = get_bits_le(&a->gb, 4);     block[0] = 8 * get_bits_le(&a->gb, 8);     ccp = asv2_get_vlc2(&a->gb, dc_ccp_vlc, DC_CCP_VLC_BITS);    if (ccp) {        if (ccp & 4)            block[a->permutated_scantable[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;        if (ccp & 2)            block[a->permutated_scantable[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;        if (ccp & 1)            block[a->permutated_scantable[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;    }     for (i = 1; i < count + 1; i++) {        const int ccp = asv2_get_vlc2(&a->gb, ac_ccp_vlc, AC_CCP_VLC_BITS);         if (ccp) {            if (ccp & 8)                block[a->permutated_scantable[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;            if (ccp & 4)                block[a->permutated_scantable[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;            if (ccp & 2)                block[a->permutated_scantable[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;            if (ccp & 1)                block[a->permutated_scantable[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;        }    }     return 0;} static inline int decode_mb(ASVDecContext *a, int16_t block[6][64]){    int i, ret;     a->bdsp.clear_blocks(block[0]);     if (a->c.avctx->codec_id == AV_CODEC_ID_ASV1) {        for (i = 0; i < 6; i++) {            if ((ret = asv1_decode_block(a, block[i])) < 0)                return ret;        }    } else {        for (i = 0; i < 6; i++) {            if ((ret = asv2_decode_block(a, block[i])) < 0)                return ret;        }    }    return 0;} static inline void idct_put(ASVDecContext *a, AVFrame *frame, int mb_x, int mb_y){    int16_t(*block)[64] = a->block;    int linesize = frame->linesize[0];     uint8_t *dest_y  = frame->data[0] + (mb_y * 16 * linesize)           + mb_x * 16;    uint8_t *dest_cb = frame->data[1] + (mb_y *  8 * frame->linesize[1]) + mb_x *  8;    uint8_t *dest_cr = frame->data[2] + (mb_y *  8 * frame->linesize[2]) + mb_x *  8;     a->idsp.idct_put(dest_y,                    linesize, block[0]);    a->idsp.idct_put(dest_y + 8,                linesize, block[1]);    a->idsp.idct_put(dest_y + 8 * linesize,     linesize, block[2]);    a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);     if (!(a->c.avctx->flags & AV_CODEC_FLAG_GRAY)) {        a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);        a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);    }} static int decode_frame(AVCodecContext *avctx, AVFrame *p,                        int *got_frame, AVPacket *avpkt){    ASVDecContext *const a = avctx->priv_data;    const ASVCommonContext *const c = &a->c;    const uint8_t *buf = avpkt->data;    int buf_size       = avpkt->size;    int ret;     if (buf_size * 8LL < c->mb_height * c->mb_width * 13LL)        return AVERROR_INVALIDDATA;     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)        return ret;     if (avctx->codec_id == AV_CODEC_ID_ASV1) {        av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,                              buf_size);        if (!a->bitstream_buffer)            return AVERROR(ENOMEM);         c->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,                           (const uint32_t *) buf, buf_size / 4);        ret = init_get_bits8(&a->gb, a->bitstream_buffer, buf_size);    } else {        ret = init_get_bits8_le(&a->gb, buf, buf_size);    }    if (ret < 0)        return ret;     for (int mb_y = 0; mb_y < c->mb_height2; mb_y++) {        for (int mb_x = 0; mb_x < c->mb_width2; mb_x++) {            if ((ret = decode_mb(a, a->block)) < 0)                return ret;             idct_put(a, p, mb_x, mb_y);        }    }     if (c->mb_width2 != c->mb_width) {        int mb_x = c->mb_width2;        for (int mb_y = 0; mb_y < c->mb_height2; mb_y++) {            if ((ret = decode_mb(a, a->block)) < 0)                return ret;             idct_put(a, p, mb_x, mb_y);        }    }     if (c->mb_height2 != c->mb_height) {        int mb_y = c->mb_height2;        for (int mb_x = 0; mb_x < c->mb_width; mb_x++) {            if ((ret = decode_mb(a, a->block)) < 0)                return ret;             idct_put(a, p, mb_x, mb_y);        }    }     *got_frame = 1;     return (get_bits_count(&a->gb) + 31) / 32 * 4;} static av_cold int decode_init(AVCodecContext *avctx){    static AVOnce init_static_once = AV_ONCE_INIT;    ASVDecContext *const a = avctx->priv_data;    const int scale      = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;    int inv_qscale;    int i;     if (avctx->extradata_size < 1) {        av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");    }     ff_asv_common_init(avctx);    ff_blockdsp_init(&a->bdsp);    ff_idctdsp_init(&a->idsp, avctx);    ff_permute_scantable(a->permutated_scantable, ff_asv_scantab,                         a->idsp.idct_permutation);    avctx->pix_fmt = AV_PIX_FMT_YUV420P;     if (avctx->extradata_size < 1 || (inv_qscale = avctx->extradata[0]) == 0) {        av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");        if (avctx->codec_id == AV_CODEC_ID_ASV1)            inv_qscale = 6;        else            inv_qscale = 10;    }     for (i = 0; i < 64; i++) {        int index = ff_asv_scantab[i];         a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] /                             inv_qscale;    }     ff_thread_once(&init_static_once, init_vlcs);     return 0;} static av_cold int decode_end(AVCodecContext *avctx){    ASVDecContext *const a = avctx->priv_data;     av_freep(&a->bitstream_buffer);    a->bitstream_buffer_size = 0;     return 0;} #if CONFIG_ASV1_DECODERconst FFCodec ff_asv1_decoder = {    .p.name         = "asv1",    CODEC_LONG_NAME("ASUS V1"),    .p.type         = AVMEDIA_TYPE_VIDEO,    .p.id           = AV_CODEC_ID_ASV1,    .priv_data_size = sizeof(ASVDecContext),    .init           = decode_init,    .close          = decode_end,    FF_CODEC_DECODE_CB(decode_frame),    .p.capabilities = AV_CODEC_CAP_DR1,};#endif #if CONFIG_ASV2_DECODERconst FFCodec ff_asv2_decoder = {    .p.name         = "asv2",    CODEC_LONG_NAME("ASUS V2"),    .p.type         = AVMEDIA_TYPE_VIDEO,    .p.id           = AV_CODEC_ID_ASV2,    .priv_data_size = sizeof(ASVDecContext),    .init           = decode_init,    FF_CODEC_DECODE_CB(decode_frame),    .p.capabilities = AV_CODEC_CAP_DR1,};#endif