yading@10: /*
yading@10:  * Copyright (c) 2003 Michael Niedermayer
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * ASUS V1/V2 decoder.
yading@10:  */
yading@10: 
yading@10: #include "libavutil/attributes.h"
yading@10: #include "libavutil/mem.h"
yading@10: 
yading@10: #include "asv.h"
yading@10: #include "avcodec.h"
yading@10: #include "put_bits.h"
yading@10: #include "internal.h"
yading@10: #include "mathops.h"
yading@10: #include "mpeg12data.h"
yading@10: 
yading@10: #define VLC_BITS 6
yading@10: #define ASV2_LEVEL_VLC_BITS 10
yading@10: 
yading@10: static VLC ccp_vlc;
yading@10: static VLC level_vlc;
yading@10: static VLC dc_ccp_vlc;
yading@10: static VLC ac_ccp_vlc;
yading@10: static VLC asv2_level_vlc;
yading@10: 
yading@10: static av_cold void init_vlcs(ASV1Context *a)
yading@10: {
yading@10:     static int done = 0;
yading@10: 
yading@10:     if (!done) {
yading@10:         done = 1;
yading@10: 
yading@10:         INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
yading@10:                         &ff_asv_ccp_tab[0][1], 2, 1,
yading@10:                         &ff_asv_ccp_tab[0][0], 2, 1, 64);
yading@10:         INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
yading@10:                         &ff_asv_dc_ccp_tab[0][1], 2, 1,
yading@10:                         &ff_asv_dc_ccp_tab[0][0], 2, 1, 64);
yading@10:         INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
yading@10:                         &ff_asv_ac_ccp_tab[0][1], 2, 1,
yading@10:                         &ff_asv_ac_ccp_tab[0][0], 2, 1, 64);
yading@10:         INIT_VLC_STATIC(&level_vlc,  VLC_BITS, 7,
yading@10:                         &ff_asv_level_tab[0][1], 2, 1,
yading@10:                         &ff_asv_level_tab[0][0], 2, 1, 64);
yading@10:         INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
yading@10:                         &ff_asv2_level_tab[0][1], 2, 1,
yading@10:                         &ff_asv2_level_tab[0][0], 2, 1, 1024);
yading@10:     }
yading@10: }
yading@10: 
yading@10: //FIXME write a reversed bitstream reader to avoid the double reverse
yading@10: static inline int asv2_get_bits(GetBitContext *gb, int n)
yading@10: {
yading@10:     return ff_reverse[get_bits(gb, n) << (8-n)];
yading@10: }
yading@10: 
yading@10: static inline int asv1_get_level(GetBitContext *gb)
yading@10: {
yading@10:     int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
yading@10: 
yading@10:     if (code == 3)
yading@10:         return get_sbits(gb, 8);
yading@10:     else
yading@10:         return code - 3;
yading@10: }
yading@10: 
yading@10: static inline int asv2_get_level(GetBitContext *gb)
yading@10: {
yading@10:     int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
yading@10: 
yading@10:     if (code == 31)
yading@10:         return (int8_t)asv2_get_bits(gb, 8);
yading@10:     else
yading@10:         return code - 31;
yading@10: }
yading@10: 
yading@10: static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     block[0] = 8 * get_bits(&a->gb, 8);
yading@10: 
yading@10:     for (i = 0; i < 11; i++) {
yading@10:         const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
yading@10: 
yading@10:         if (ccp) {
yading@10:             if (ccp == 16)
yading@10:                 break;
yading@10:             if (ccp < 0 || i >= 10) {
yading@10:                 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10: 
yading@10:             if (ccp & 8)
yading@10:                 block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
yading@10:             if (ccp & 4)
yading@10:                 block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
yading@10:             if (ccp & 2)
yading@10:                 block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
yading@10:             if (ccp & 1)
yading@10:                 block[a->scantable.permutated[4 * i + 3]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
yading@10: {
yading@10:     int i, count, ccp;
yading@10: 
yading@10:     count = asv2_get_bits(&a->gb, 4);
yading@10: 
yading@10:     block[0] = 8 * asv2_get_bits(&a->gb, 8);
yading@10: 
yading@10:     ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
yading@10:     if (ccp) {
yading@10:         if (ccp & 4)
yading@10:             block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
yading@10:         if (ccp & 2)
yading@10:             block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
yading@10:         if (ccp & 1)
yading@10:             block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
yading@10:     }
yading@10: 
yading@10:     for (i = 1; i < count + 1; i++) {
yading@10:         const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
yading@10: 
yading@10:         if (ccp) {
yading@10:             if (ccp & 8)
yading@10:                 block[a->scantable.permutated[4*i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 0]) >> 4;
yading@10:             if (ccp & 4)
yading@10:                 block[a->scantable.permutated[4*i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 1]) >> 4;
yading@10:             if (ccp & 2)
yading@10:                 block[a->scantable.permutated[4*i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 2]) >> 4;
yading@10:             if (ccp & 1)
yading@10:                 block[a->scantable.permutated[4*i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4*i + 3]) >> 4;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     a->dsp.clear_blocks(block[0]);
yading@10: 
yading@10:     if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
yading@10:         for (i = 0; i < 6; i++) {
yading@10:             if (asv1_decode_block(a, block[i]) < 0)
yading@10:                 return -1;
yading@10:         }
yading@10:     } else {
yading@10:         for (i = 0; i < 6; i++) {
yading@10:             if (asv2_decode_block(a, block[i]) < 0)
yading@10:                 return -1;
yading@10:         }
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
yading@10: {
yading@10:     int16_t (*block)[64] = a->block;
yading@10:     int linesize         = frame->linesize[0];
yading@10: 
yading@10:     uint8_t *dest_y  = frame->data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
yading@10:     uint8_t *dest_cb = frame->data[1] + (mb_y * 8 * frame->linesize[1]) + mb_x * 8;
yading@10:     uint8_t *dest_cr = frame->data[2] + (mb_y * 8 * frame->linesize[2]) + mb_x * 8;
yading@10: 
yading@10:     a->dsp.idct_put(dest_y                 , linesize, block[0]);
yading@10:     a->dsp.idct_put(dest_y              + 8, linesize, block[1]);
yading@10:     a->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
yading@10:     a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
yading@10: 
yading@10:     if (!(a->avctx->flags&CODEC_FLAG_GRAY)) {
yading@10:         a->dsp.idct_put(dest_cb, frame->linesize[1], block[4]);
yading@10:         a->dsp.idct_put(dest_cr, frame->linesize[2], block[5]);
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int decode_frame(AVCodecContext *avctx,
yading@10:                         void *data, int *got_frame,
yading@10:                         AVPacket *avpkt)
yading@10: {
yading@10:     ASV1Context * const a = avctx->priv_data;
yading@10:     const uint8_t *buf    = avpkt->data;
yading@10:     int buf_size          = avpkt->size;
yading@10:     AVFrame * const p     = data;
yading@10:     int mb_x, mb_y, ret;
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
yading@10:         return ret;
yading@10:     p->pict_type = AV_PICTURE_TYPE_I;
yading@10:     p->key_frame = 1;
yading@10: 
yading@10:     av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
yading@10:                           buf_size);
yading@10:     if (!a->bitstream_buffer)
yading@10:         return AVERROR(ENOMEM);
yading@10: 
yading@10:     if (avctx->codec_id == AV_CODEC_ID_ASV1)
yading@10:         a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
yading@10:     else {
yading@10:         int i;
yading@10:         for (i = 0; i < buf_size; i++)
yading@10:             a->bitstream_buffer[i] = ff_reverse[buf[i]];
yading@10:     }
yading@10: 
yading@10:     init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
yading@10: 
yading@10:     for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
yading@10:         for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
yading@10:             if ((ret = decode_mb(a, a->block)) < 0)
yading@10:                 return ret;
yading@10: 
yading@10:             idct_put(a, p, mb_x, mb_y);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (a->mb_width2 != a->mb_width) {
yading@10:         mb_x = a->mb_width2;
yading@10:         for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
yading@10:             if ((ret = decode_mb(a, a->block)) < 0)
yading@10:                 return ret;
yading@10: 
yading@10:             idct_put(a, p, mb_x, mb_y);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (a->mb_height2 != a->mb_height) {
yading@10:         mb_y = a->mb_height2;
yading@10:         for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
yading@10:             if ((ret = decode_mb(a, a->block)) < 0)
yading@10:                 return ret;
yading@10: 
yading@10:             idct_put(a, p, mb_x, mb_y);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     emms_c();
yading@10: 
yading@10:     return (get_bits_count(&a->gb) + 31) / 32 * 4;
yading@10: }
yading@10: 
yading@10: static av_cold int decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     ASV1Context * const a = avctx->priv_data;
yading@10:     const int scale       = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
yading@10:     int i;
yading@10: 
yading@10:     ff_asv_common_init(avctx);
yading@10:     init_vlcs(a);
yading@10:     ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_asv_scantab);
yading@10:     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
yading@10: 
yading@10:     if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
yading@10:         if (avctx->codec_id == AV_CODEC_ID_ASV1)
yading@10:             a->inv_qscale = 6;
yading@10:         else
yading@10:             a->inv_qscale = 10;
yading@10:     }
yading@10: 
yading@10:     for (i = 0; i < 64; i++) {
yading@10:         int index = ff_asv_scantab[i];
yading@10: 
yading@10:         a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     ASV1Context * const a = avctx->priv_data;
yading@10: 
yading@10:     av_freep(&a->bitstream_buffer);
yading@10:     a->bitstream_buffer_size = 0;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: #if CONFIG_ASV1_DECODER
yading@10: AVCodec ff_asv1_decoder = {
yading@10:     .name           = "asv1",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_ASV1,
yading@10:     .priv_data_size = sizeof(ASV1Context),
yading@10:     .init           = decode_init,
yading@10:     .close          = decode_end,
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("ASUS V1"),
yading@10: };
yading@10: #endif
yading@10: 
yading@10: #if CONFIG_ASV2_DECODER
yading@10: AVCodec ff_asv2_decoder = {
yading@10:     .name           = "asv2",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_ASV2,
yading@10:     .priv_data_size = sizeof(ASV1Context),
yading@10:     .init           = decode_init,
yading@10:     .close          = decode_end,
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("ASUS V2"),
yading@10: };
yading@10: #endif
yading@10: