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FFmpeg/libavcodec/asvdec.c
Andreas Rheinhardt 2d764069be avcodec/vlc: Use structure instead of VLC_TYPE array as VLC element 
In C, qualifiers for arrays are broken:
const VLC_TYPE (*foo)[2] is a pointer to an array of two const VLC_TYPE
elements and unfortunately this is not compatible with a pointer
to a const array of two VLC_TYPE, because the latter does not exist
as array types are never qualified (the qualifier applies to the base
type instead). This is the reason why get_vlc2() doesn't accept
a const VLC table despite not modifying the table at all, as
there is no automatic conversion from VLC_TYPE (*)[2] to
const VLC_TYPE (*)[2].

Fix this by using a structure VLCElem for the VLC table.
This also has the advantage of making it clear which
element is which.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-06-17 16:47:29 +02:00

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/*
* 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/thread.h"
#include "asv.h"
#include "avcodec.h"
#include "blockdsp.h"
#include "codec_internal.h"
#include "config_components.h"
#include "idctdsp.h"
#include "internal.h"
#include "mpeg12data.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 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(void)
{
INIT_VLC_STATIC(&ccp_vlc, CCP_VLC_BITS, 17,
&ff_asv_ccp_tab[0][1], 2, 1,
&ff_asv_ccp_tab[0][0], 2, 1, 32);
INIT_LE_VLC_STATIC(&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, 16);
INIT_LE_VLC_STATIC(&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, 64);
INIT_VLC_STATIC(&level_vlc, ASV1_LEVEL_VLC_BITS, 7,
&ff_asv_level_tab[0][1], 2, 1,
&ff_asv_level_tab[0][0], 2, 1, 16);
INIT_LE_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
&ff_asv2_level_tab[0][1], 4, 2,
&ff_asv2_level_tab[0][0], 4, 2, 1024);
}
static inline int asv1_get_level(GetBitContext *gb)
{
int code = get_vlc2(gb, level_vlc.table, ASV1_LEVEL_VLC_BITS, 1);
if (code == 3)
return get_sbits(gb, 8);
else
return code - 3;
}
// get_vlc2() is big-endian in this file
static 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.table, 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(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, CCP_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 = get_bits_le(&a->gb, 4);
block[0] = 8 * get_bits_le(&a->gb, 8);
ccp = asv2_get_vlc2(&a->gb, dc_ccp_vlc.table, DC_CCP_VLC_BITS);
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 = asv2_get_vlc2(&a->gb, ac_ccp_vlc.table, AC_CCP_VLC_BITS);
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, AVFrame *p,
int *got_frame, AVPacket *avpkt)
{
ASV1Context *const a = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
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;
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);
a->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 (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)
{
static AVOnce init_static_once = AV_ONCE_INIT;
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);
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;
}
ff_thread_once(&init_static_once, init_vlcs);
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_DECODER
const FFCodec ff_asv1_decoder = {
.p.name = "asv1",
.p.long_name = NULL_IF_CONFIG_SMALL("ASUS V1"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_ASV1,
.priv_data_size = sizeof(ASV1Context),
.init = decode_init,
.close = decode_end,
FF_CODEC_DECODE_CB(decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
#endif
#if CONFIG_ASV2_DECODER
const FFCodec ff_asv2_decoder = {
.p.name = "asv2",
.p.long_name = NULL_IF_CONFIG_SMALL("ASUS V2"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_ASV2,
.priv_data_size = sizeof(ASV1Context),
.init = decode_init,
FF_CODEC_DECODE_CB(decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
#endif
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