/* * 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 "asv.h"#include "avcodec.h"#include "blockdsp.h"#include "idctdsp.h"#include "internal.h"#include "mathops.h"#include "mpeg12data.h" #define VLC_BITS             6#define ASV2_LEVEL_VLC_BITS 10 static VLC ccp_vlc;static VLC level_vlc;static VLC dc_ccp_vlc;static VLC ac_ccp_vlc;static VLC asv2_level_vlc; static av_cold void init_vlcs(ASV1Context *a){    static int done = 0;     if (!done) {        done = 1;         INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,                        &ff_asv_ccp_tab[0][1], 2, 1,                        &ff_asv_ccp_tab[0][0], 2, 1, 64);        INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,                        &ff_asv_dc_ccp_tab[0][1], 2, 1,                        &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);        INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,                        &ff_asv_ac_ccp_tab[0][1], 2, 1,                        &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);        INIT_VLC_STATIC(&level_vlc,  VLC_BITS, 7,                        &ff_asv_level_tab[0][1], 2, 1,                        &ff_asv_level_tab[0][0], 2, 1, 64);        INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,                        &ff_asv2_level_tab[0][1], 2, 1,                        &ff_asv2_level_tab[0][0], 2, 1, 1024);    }} // FIXME write a reversed bitstream reader to avoid the double reversestatic inline int asv2_get_bits(GetBitContext *gb, int n){    return ff_reverse[get_bits(gb, n) << (8 - n)];} static inline int asv1_get_level(GetBitContext *gb){    int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);     if (code == 3)        return get_sbits(gb, 8);    else        return code - 3;} static inline int asv2_get_level(GetBitContext *gb){    int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);     if (code == 31)        return (int8_t) asv2_get_bits(gb, 8);    else        return code - 31;} static inline int asv1_decode_block(ASV1Context *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.table, VLC_BITS, 1);         if (ccp) {            if (ccp == 16)                break;            if (ccp < 0 || i >= 10) {                av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");                return AVERROR_INVALIDDATA;            }             if (ccp & 8)                block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;            if (ccp & 4)                block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;            if (ccp & 2)                block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;            if (ccp & 1)                block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;        }    }     return 0;} static inline int asv2_decode_block(ASV1Context *a, int16_t block[64]){    int i, count, ccp;     count = asv2_get_bits(&a->gb, 4);     block[0] = 8 * asv2_get_bits(&a->gb, 8);     ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);    if (ccp) {        if (ccp & 4)            block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;        if (ccp & 2)            block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;        if (ccp & 1)            block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;    }     for (i = 1; i < count + 1; i++) {        const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);         if (ccp) {            if (ccp & 8)                block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;            if (ccp & 4)                block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;            if (ccp & 2)                block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;            if (ccp & 1)                block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;        }    }     return 0;} static inline int decode_mb(ASV1Context *a, int16_t block[6][64]){    int i, ret;     a->bdsp.clear_blocks(block[0]);     if (a->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(ASV1Context *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->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, void *data, int *got_frame,                        AVPacket *avpkt){    ASV1Context *const a = avctx->priv_data;    const uint8_t *buf = avpkt->data;    int buf_size       = avpkt->size;    AVFrame *const p = data;    int mb_x, mb_y, ret;     if (buf_size * 8LL < a->mb_height * a->mb_width * 13LL)        return AVERROR_INVALIDDATA;     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)        return ret;    p->pict_type = AV_PICTURE_TYPE_I;    p->key_frame = 1;     av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,                          buf_size);    if (!a->bitstream_buffer)        return AVERROR(ENOMEM);     if (avctx->codec_id == AV_CODEC_ID_ASV1) {        a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,                           (const uint32_t *) buf, buf_size / 4);    } else {        int i;        for (i = 0; i < buf_size; i++)            a->bitstream_buffer[i] = ff_reverse[buf[i]];    }     init_get_bits(&a->gb, a->bitstream_buffer, buf_size * 8);     for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {        for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {            if ((ret = decode_mb(a, a->block)) < 0)                return ret;             idct_put(a, p, mb_x, mb_y);        }    }     if (a->mb_width2 != a->mb_width) {        mb_x = a->mb_width2;        for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {            if ((ret = decode_mb(a, a->block)) < 0)                return ret;             idct_put(a, p, mb_x, mb_y);        }    }     if (a->mb_height2 != a->mb_height) {        mb_y = a->mb_height2;        for (mb_x = 0; mb_x < a->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;     emms_c();     return (get_bits_count(&a->gb) + 31) / 32 * 4;} static av_cold int decode_init(AVCodecContext *avctx){    ASV1Context *const a = avctx->priv_data;    const int scale      = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;    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, avctx);    ff_idctdsp_init(&a->idsp, avctx);    init_vlcs(a);    ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab);    avctx->pix_fmt = AV_PIX_FMT_YUV420P;     if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {        av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");        if (avctx->codec_id == AV_CODEC_ID_ASV1)            a->inv_qscale = 6;        else            a->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] /                             a->inv_qscale;    }     return 0;} static av_cold int decode_end(AVCodecContext *avctx){    ASV1Context *const a = avctx->priv_data;     av_freep(&a->bitstream_buffer);    a->bitstream_buffer_size = 0;     return 0;} #if CONFIG_ASV1_DECODERAVCodec ff_asv1_decoder = {    .name           = "asv1",    .long_name      = NULL_IF_CONFIG_SMALL("ASUS V1"),    .type           = AVMEDIA_TYPE_VIDEO,    .id             = AV_CODEC_ID_ASV1,    .priv_data_size = sizeof(ASV1Context),    .init           = decode_init,    .close          = decode_end,    .decode         = decode_frame,    .capabilities   = AV_CODEC_CAP_DR1,};#endif #if CONFIG_ASV2_DECODERAVCodec ff_asv2_decoder = {    .name           = "asv2",    .long_name      = NULL_IF_CONFIG_SMALL("ASUS V2"),    .type           = AVMEDIA_TYPE_VIDEO,    .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