GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/asvdec.c Lines: 137 152 90.1 %
Date: 2019-11-18 18:00:01 Branches: 79 96 82.3 %

Line Branch Exec Source
1
/*
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 * Copyright (c) 2003 Michael Niedermayer
3
 *
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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
7
 * modify it under the terms of the GNU Lesser General Public
8
 * 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
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * 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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 */
20
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/**
22
 * @file
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 * ASUS V1/V2 decoder.
24
 */
25
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#include "libavutil/attributes.h"
27
#include "libavutil/mem.h"
28
29
#include "asv.h"
30
#include "avcodec.h"
31
#include "blockdsp.h"
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#include "idctdsp.h"
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#include "internal.h"
34
#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;
41
static VLC level_vlc;
42
static VLC dc_ccp_vlc;
43
static VLC ac_ccp_vlc;
44
static VLC asv2_level_vlc;
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46
18
static av_cold void init_vlcs(ASV1Context *a)
47
{
48
    static int done = 0;
49
50
18
    if (!done) {
51
10
        done = 1;
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53
10
        INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
54
                        &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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10
        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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10
        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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10
        INIT_VLC_STATIC(&level_vlc,  VLC_BITS, 7,
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                        &ff_asv_level_tab[0][1], 2, 1,
64
                        &ff_asv_level_tab[0][0], 2, 1, 64);
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10
        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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18
}
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// FIXME write a reversed bitstream reader to avoid the double reverse
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718813
static inline int asv2_get_bits(GetBitContext *gb, int n)
73
{
74
718813
    return ff_reverse[get_bits(gb, n) << (8 - n)];
75
}
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77
2972884
static inline int asv1_get_level(GetBitContext *gb)
78
{
79
2972884
    int code = get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
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2972884
    if (code == 3)
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429712
        return get_sbits(gb, 8);
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    else
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2543172
        return code - 3;
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}
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3660409
static inline int asv2_get_level(GetBitContext *gb)
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{
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3660409
    int code = get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
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3660409
    if (code == 31)
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613
        return (int8_t) asv2_get_bits(gb, 8);
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    else
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3659796
        return code - 31;
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}
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359100
static inline int asv1_decode_block(ASV1Context *a, int16_t block[64])
98
{
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    int i;
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359100
    block[0] = 8 * get_bits(&a->gb, 8);
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2128752
    for (i = 0; i < 11; i++) {
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2128752
        const int ccp = get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
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2128752
        if (ccp) {
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1723494
            if (ccp == 16)
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359100
                break;
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1364394
            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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1364394
            if (ccp & 8)
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759471
                block[a->scantable.permutated[4 * i + 0]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
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1364394
            if (ccp & 4)
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828513
                block[a->scantable.permutated[4 * i + 1]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
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1364394
            if (ccp & 2)
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781213
                block[a->scantable.permutated[4 * i + 2]] = (asv1_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
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1364394
            if (ccp & 1)
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603687
                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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359100
    return 0;
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}
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359100
static inline int asv2_decode_block(ASV1Context *a, int16_t block[64])
129
{
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    int i, count, ccp;
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359100
    count = asv2_get_bits(&a->gb, 4);
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359100
    block[0] = 8 * asv2_get_bits(&a->gb, 8);
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136
359100
    ccp = get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
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359100
    if (ccp) {
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329075
        if (ccp & 4)
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281504
            block[a->scantable.permutated[1]] = (asv2_get_level(&a->gb) * a->intra_matrix[1]) >> 4;
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329075
        if (ccp & 2)
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284503
            block[a->scantable.permutated[2]] = (asv2_get_level(&a->gb) * a->intra_matrix[2]) >> 4;
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329075
        if (ccp & 1)
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226812
            block[a->scantable.permutated[3]] = (asv2_get_level(&a->gb) * a->intra_matrix[3]) >> 4;
144
    }
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2350028
    for (i = 1; i < count + 1; i++) {
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1990928
        const int ccp = get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
148
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1990928
        if (ccp) {
150
1368743
            if (ccp & 8)
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968959
                block[a->scantable.permutated[4 * i + 0]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 0]) >> 4;
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1368743
            if (ccp & 4)
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733048
                block[a->scantable.permutated[4 * i + 1]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 1]) >> 4;
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1368743
            if (ccp & 2)
155
667011
                block[a->scantable.permutated[4 * i + 2]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 2]) >> 4;
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1368743
            if (ccp & 1)
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498572
                block[a->scantable.permutated[4 * i + 3]] = (asv2_get_level(&a->gb) * a->intra_matrix[4 * i + 3]) >> 4;
158
        }
159
    }
160
161
359100
    return 0;
162
}
163
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119700
static inline int decode_mb(ASV1Context *a, int16_t block[6][64])
165
{
166
    int i, ret;
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168
119700
    a->bdsp.clear_blocks(block[0]);
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119700
    if (a->avctx->codec_id == AV_CODEC_ID_ASV1) {
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418950
        for (i = 0; i < 6; i++) {
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359100
            if ((ret = asv1_decode_block(a, block[i])) < 0)
173
                return ret;
174
        }
175
    } else {
176
418950
        for (i = 0; i < 6; i++) {
177
359100
            if ((ret = asv2_decode_block(a, block[i])) < 0)
178
                return ret;
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        }
180
    }
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119700
    return 0;
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}
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119700
static inline void idct_put(ASV1Context *a, AVFrame *frame, int mb_x, int mb_y)
185
{
186
119700
    int16_t(*block)[64] = a->block;
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119700
    int linesize = frame->linesize[0];
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119700
    uint8_t *dest_y  = frame->data[0] + (mb_y * 16 * linesize)           + mb_x * 16;
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119700
    uint8_t *dest_cb = frame->data[1] + (mb_y *  8 * frame->linesize[1]) + mb_x *  8;
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119700
    uint8_t *dest_cr = frame->data[2] + (mb_y *  8 * frame->linesize[2]) + mb_x *  8;
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119700
    a->idsp.idct_put(dest_y,                    linesize, block[0]);
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119700
    a->idsp.idct_put(dest_y + 8,                linesize, block[1]);
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119700
    a->idsp.idct_put(dest_y + 8 * linesize,     linesize, block[2]);
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119700
    a->idsp.idct_put(dest_y + 8 * linesize + 8, linesize, block[3]);
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119700
    if (!(a->avctx->flags & AV_CODEC_FLAG_GRAY)) {
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119700
        a->idsp.idct_put(dest_cb, frame->linesize[1], block[4]);
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119700
        a->idsp.idct_put(dest_cr, frame->linesize[2], block[5]);
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    }
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119700
}
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400
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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                        AVPacket *avpkt)
206
{
207
400
    ASV1Context *const a = avctx->priv_data;
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400
    const uint8_t *buf = avpkt->data;
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400
    int buf_size       = avpkt->size;
210
400
    AVFrame *const p = data;
211
    int mb_x, mb_y, ret;
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213
400
    if (buf_size * 8LL < a->mb_height * a->mb_width * 13LL)
214
        return AVERROR_INVALIDDATA;
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400
    if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
217
        return ret;
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400
    p->pict_type = AV_PICTURE_TYPE_I;
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400
    p->key_frame = 1;
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400
    av_fast_padded_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size,
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                          buf_size);
223
400
    if (!a->bitstream_buffer)
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        return AVERROR(ENOMEM);
225
226
400
    if (avctx->codec_id == AV_CODEC_ID_ASV1) {
227
200
        a->bbdsp.bswap_buf((uint32_t *) a->bitstream_buffer,
228
                           (const uint32_t *) buf, buf_size / 4);
229
    } else {
230
        int i;
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2941200
        for (i = 0; i < buf_size; i++)
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2941000
            a->bitstream_buffer[i] = ff_reverse[buf[i]];
233
    }
234
235
400
    init_get_bits(&a->gb, a->bitstream_buffer, buf_size * 8);
236
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6000
    for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
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124800
        for (mb_x = 0; mb_x < a->mb_width2; mb_x++) {
239
119200
            if ((ret = decode_mb(a, a->block)) < 0)
240
                return ret;
241
242
119200
            idct_put(a, p, mb_x, mb_y);
243
        }
244
    }
245
246
400
    if (a->mb_width2 != a->mb_width) {
247
100
        mb_x = a->mb_width2;
248
300
        for (mb_y = 0; mb_y < a->mb_height2; mb_y++) {
249
200
            if ((ret = decode_mb(a, a->block)) < 0)
250
                return ret;
251
252
200
            idct_put(a, p, mb_x, mb_y);
253
        }
254
    }
255
256
400
    if (a->mb_height2 != a->mb_height) {
257
100
        mb_y = a->mb_height2;
258
400
        for (mb_x = 0; mb_x < a->mb_width; mb_x++) {
259
300
            if ((ret = decode_mb(a, a->block)) < 0)
260
                return ret;
261
262
300
            idct_put(a, p, mb_x, mb_y);
263
        }
264
    }
265
266
400
    *got_frame = 1;
267
268
400
    emms_c();
269
270
400
    return (get_bits_count(&a->gb) + 31) / 32 * 4;
271
}
272
273
18
static av_cold int decode_init(AVCodecContext *avctx)
274
{
275
18
    ASV1Context *const a = avctx->priv_data;
276
18
    const int scale      = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
277
    int i;
278
279
18
    if (avctx->extradata_size < 1) {
280
        av_log(avctx, AV_LOG_WARNING, "No extradata provided\n");
281
    }
282
283
18
    ff_asv_common_init(avctx);
284
18
    ff_blockdsp_init(&a->bdsp, avctx);
285
18
    ff_idctdsp_init(&a->idsp, avctx);
286
18
    init_vlcs(a);
287
18
    ff_init_scantable(a->idsp.idct_permutation, &a->scantable, ff_asv_scantab);
288
18
    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
289
290

18
    if (avctx->extradata_size < 1 || (a->inv_qscale = avctx->extradata[0]) == 0) {
291
        av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
292
        if (avctx->codec_id == AV_CODEC_ID_ASV1)
293
            a->inv_qscale = 6;
294
        else
295
            a->inv_qscale = 10;
296
    }
297
298
1170
    for (i = 0; i < 64; i++) {
299
1152
        int index = ff_asv_scantab[i];
300
301
1152
        a->intra_matrix[i] = 64 * scale * ff_mpeg1_default_intra_matrix[index] /
302
1152
                             a->inv_qscale;
303
    }
304
305
18
    return 0;
306
}
307
308
18
static av_cold int decode_end(AVCodecContext *avctx)
309
{
310
18
    ASV1Context *const a = avctx->priv_data;
311
312
18
    av_freep(&a->bitstream_buffer);
313
18
    a->bitstream_buffer_size = 0;
314
315
18
    return 0;
316
}
317
318
#if CONFIG_ASV1_DECODER
319
AVCodec ff_asv1_decoder = {
320
    .name           = "asv1",
321
    .long_name      = NULL_IF_CONFIG_SMALL("ASUS V1"),
322
    .type           = AVMEDIA_TYPE_VIDEO,
323
    .id             = AV_CODEC_ID_ASV1,
324
    .priv_data_size = sizeof(ASV1Context),
325
    .init           = decode_init,
326
    .close          = decode_end,
327
    .decode         = decode_frame,
328
    .capabilities   = AV_CODEC_CAP_DR1,
329
};
330
#endif
331
332
#if CONFIG_ASV2_DECODER
333
AVCodec ff_asv2_decoder = {
334
    .name           = "asv2",
335
    .long_name      = NULL_IF_CONFIG_SMALL("ASUS V2"),
336
    .type           = AVMEDIA_TYPE_VIDEO,
337
    .id             = AV_CODEC_ID_ASV2,
338
    .priv_data_size = sizeof(ASV1Context),
339
    .init           = decode_init,
340
    .close          = decode_end,
341
    .decode         = decode_frame,
342
    .capabilities   = AV_CODEC_CAP_DR1,
343
};
344
#endif