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FFmpeg/libavcodec/leaddec.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* LEAD MCMP decoder
*
* Copyright (c) 2023 Peter Ross
*
* 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
*/
#include "avcodec.h"
#include "blockdsp.h"
#include "codec_internal.h"
#include "copy_block.h"
#include "decode.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "jpegquanttables.h"
#include "jpegtables.h"
#include "leaddata.h"
#include "libavutil/mem.h"
#include "libavutil/mem_internal.h"
#include "libavutil/thread.h"
#define LUMA_DC_BITS 9
#define CHROMA_DC_BITS 11
#define LUMA_AC_BITS 10
#define CHROMA_AC_BITS 10
static VLCElem luma_dc_vlc[1 << LUMA_DC_BITS];
static VLCElem chroma_dc_vlc[1 << CHROMA_DC_BITS];
static VLCElem luma_ac_vlc[1160];
static VLCElem chroma_ac_vlc[1160];
static av_cold void lead_init_static_data(void)
{
VLC_INIT_STATIC_TABLE_FROM_LENGTHS(luma_dc_vlc, LUMA_DC_BITS, FF_ARRAY_ELEMS(luma_dc_len),
luma_dc_len, 1,
NULL, 0, 0,
0, 0);
VLC_INIT_STATIC_TABLE_FROM_LENGTHS(chroma_dc_vlc, CHROMA_DC_BITS, FF_ARRAY_ELEMS(chroma_dc_len),
chroma_dc_len, 1,
NULL, 0, 0,
0, 0);
VLC_INIT_STATIC_TABLE_FROM_LENGTHS(luma_ac_vlc, LUMA_AC_BITS, FF_ARRAY_ELEMS(luma_ac_len),
luma_ac_len, 1,
ff_mjpeg_val_ac_luminance, 1, 1,
0, 0);
VLC_INIT_STATIC_TABLE_FROM_LENGTHS(chroma_ac_vlc, CHROMA_AC_BITS, FF_ARRAY_ELEMS(chroma_ac_len),
chroma_ac_len, 1,
ff_mjpeg_val_ac_chrominance, 1, 1,
0, 0);
}
typedef struct LeadContext {
uint8_t *bitstream_buf;
unsigned int bitstream_buf_size;
BlockDSPContext bdsp;
IDCTDSPContext idsp;
uint8_t permutated_scantable[64];
} LeadContext;
static av_cold int lead_decode_init(AVCodecContext * avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
LeadContext *s = avctx->priv_data;
if (avctx->extradata_size < 20)
return AVERROR_INVALIDDATA;
ff_blockdsp_init(&s->bdsp);
ff_idctdsp_init(&s->idsp, avctx);
ff_permute_scantable(s->permutated_scantable, ff_zigzag_direct, s->idsp.idct_permutation);
ff_thread_once(&init_static_once, lead_init_static_data);
return 0;
}
static void calc_dequant(uint16_t * dequant, const uint8_t * quant_tbl, int q)
{
for (int i = 0; i < 64; i++)
dequant[i] = av_clip(q * quant_tbl[ff_zigzag_direct[i]] / 50, 2, 32767);
}
static int decode_block(LeadContext * s, GetBitContext * gb,
const VLCElem * dc_table, int dc_bits, const VLCElem * ac_table, int ac_bits,
int16_t * dc_pred, const uint16_t * dequant,
uint8_t * dst, int stride)
{
DECLARE_ALIGNED(32, int16_t, block)[64];
int size;
s->bdsp.clear_block(block);
if (get_bits_left(gb) <= 0)
return AVERROR_INVALIDDATA;
size = get_vlc2(gb, dc_table, dc_bits, 1);
if (size < 0)
return AVERROR_INVALIDDATA;
if (size)
*dc_pred += get_xbits(gb, size);
block[0] = (1 << 10) + *dc_pred * dequant[0];
for (int i = 1; i < 64; i++) {
int symbol = get_vlc2(gb, ac_table, ac_bits, 2);
if (symbol < 0)
return AVERROR_INVALIDDATA;
if (!symbol)
break;
i += symbol >> 4;
if (i >= 64)
return AVERROR_INVALIDDATA;
size = symbol & 0xF;
if (size)
block[s->permutated_scantable[i]] = get_xbits(gb, size) * dequant[i];
}
s->idsp.idct_put(dst, stride, block);
return 0;
}
static int lead_decode_frame(AVCodecContext *avctx, AVFrame * frame,
int * got_frame, AVPacket * avpkt)
{
LeadContext *s = avctx->priv_data;
const uint8_t * buf = avpkt->data;
int ret, format, zero = 0, yuv20p_half = 0, fields = 1, q, size;
GetBitContext gb;
int16_t dc_pred[3] = {0, 0, 0};
uint16_t dequant[2][64];
if (avpkt->size < 8)
return AVERROR_INVALIDDATA;
format = AV_RL16(buf + 4);
switch(format) {
case 0x0:
zero = 1;
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
break;
case 0x8000:
yuv20p_half = 1;
// fall-through
case 0x1000:
avctx->pix_fmt = AV_PIX_FMT_YUV420P;
break;
case 0x2000:
avctx->pix_fmt = AV_PIX_FMT_YUV444P;
break;
case 0x2006:
avctx->pix_fmt = AV_PIX_FMT_YUV444P;
fields = 2;
break;
default:
avpriv_request_sample(avctx, "unsupported format 0x%x", format);
return AVERROR_PATCHWELCOME;
}
q = AV_RL16(buf + 6);
calc_dequant(dequant[0], ff_mjpeg_std_luminance_quant_tbl, q);
calc_dequant(dequant[1], ff_mjpeg_std_chrominance_quant_tbl, q);
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
frame->flags |= AV_FRAME_FLAG_KEY;
frame->pict_type = AV_PICTURE_TYPE_I;
av_fast_padded_malloc(&s->bitstream_buf, &s->bitstream_buf_size, avpkt->size - 8);
if (!s->bitstream_buf)
return AVERROR(ENOMEM);
size = 0;
for (int i = 8; i < avpkt->size; i++) {
int src = buf[i] ^ 0x80;
s->bitstream_buf[size++] = src;
if (src == 0xFF && i + 1 < avpkt->size && (buf[i + 1] ^ 0x80) == 0x00)
i++;
}
init_get_bits8(&gb, s->bitstream_buf, size);
if (avctx->pix_fmt == AV_PIX_FMT_YUV420P && zero) {
for (int mb_y = 0; mb_y < avctx->height / 8; mb_y++)
for (int mb_x = 0; mb_x < avctx->width / 16; mb_x++)
for (int b = 0; b < 4; b++) {
int luma_block = 2;
const VLCElem * dc_vlc = b < luma_block ? luma_dc_vlc : chroma_dc_vlc;
int dc_bits = b < luma_block ? LUMA_DC_BITS : CHROMA_DC_BITS;
const VLCElem * ac_vlc = b < luma_block ? luma_ac_vlc : chroma_ac_vlc;
int ac_bits = b < luma_block ? LUMA_AC_BITS : CHROMA_AC_BITS;
int plane = b < luma_block ? 0 : b - 1;
int x, y, yclip;
if (b < luma_block) {
y = 8*mb_y + 8*(b >> 1);
x = 16*mb_x + 8*(b & 1);
yclip = 0;
} else {
y = 4*mb_y;
x = 8*mb_x;
yclip = y + 8 >= avctx->height / 2;
}
if (yclip) {
uint8_t tmp[64];
ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
dc_pred + plane, dequant[!(b < 4)], tmp, 8);
for (int yy = 0; yy < 8 && y + yy < avctx->height / 2; yy++)
memcpy(frame->data[plane] + (y+yy)*frame->linesize[plane] + x, tmp + yy, 8);
} else {
ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
dc_pred + plane, dequant[!(b < 4)],
frame->data[plane] + y*frame->linesize[plane] + x,
frame->linesize[plane]);
}
if (ret < 0)
return ret;
}
} else if (avctx->pix_fmt == AV_PIX_FMT_YUV420P) {
for (int mb_y = 0; mb_y < (avctx->height + 15) / 16; mb_y++)
for (int mb_x = 0; mb_x < (avctx->width + 15) / 16; mb_x++)
for (int b = 0; b < (yuv20p_half ? 4 : 6); b++) {
int luma_block = yuv20p_half ? 2 : 4;
const VLCElem * dc_vlc = b < luma_block ? luma_dc_vlc : chroma_dc_vlc;
int dc_bits = b < luma_block ? LUMA_DC_BITS : CHROMA_DC_BITS;
const VLCElem * ac_vlc = b < luma_block ? luma_ac_vlc : chroma_ac_vlc;
int ac_bits = b < luma_block ? LUMA_AC_BITS : CHROMA_AC_BITS;
int plane = b < luma_block ? 0 : b - (yuv20p_half ? 1 : 3);
int x, y;
if (b < luma_block) {
y = 16*mb_y + 8*(b >> 1);
x = 16*mb_x + 8*(b & 1);
} else {
y = 8*mb_y;
x = 8*mb_x;
}
ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
dc_pred + plane, dequant[!(b < 4)],
frame->data[plane] + y*frame->linesize[plane] + x,
(yuv20p_half && b < 2 ? 2 : 1) * frame->linesize[plane]);
if (ret < 0)
return ret;
if (yuv20p_half && b < 2)
copy_block8(frame->data[plane] + (y + 1)*frame->linesize[plane] + x,
frame->data[plane] + y*frame->linesize[plane] + x,
2*frame->linesize[plane], 2*frame->linesize[plane], 8);
}
} else {
for (int f = 0; f < fields; f++)
for (int j = 0; j < (avctx->height + 7) / fields / 8; j++)
for (int i = 0; i < (avctx->width + 7) / 8; i++)
for (int plane = 0; plane < 3; plane++) {
const VLCElem * dc_vlc = !plane ? luma_dc_vlc : chroma_dc_vlc;
int dc_bits = !plane ? LUMA_DC_BITS : CHROMA_DC_BITS;
const VLCElem * ac_vlc = !plane ? luma_ac_vlc : chroma_ac_vlc;
int ac_bits = !plane ? LUMA_AC_BITS : CHROMA_AC_BITS;
ret = decode_block(s, &gb, dc_vlc, dc_bits, ac_vlc, ac_bits,
dc_pred + plane, dequant[!!plane],
frame->data[plane] + (f + 8*j*fields)*frame->linesize[plane] + 8*i,
fields * frame->linesize[plane]);
if (ret < 0)
return ret;
}
}
*got_frame = 1;
return avpkt->size;
}
static av_cold int lead_decode_end(AVCodecContext * avctx)
{
LeadContext *s = avctx->priv_data;
av_freep(&s->bitstream_buf);
return 0;
}
const FFCodec ff_lead_decoder = {
.p.name = "lead",
CODEC_LONG_NAME("LEAD MCMP"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_LEAD,
.priv_data_size = sizeof(LeadContext),
.init = lead_decode_init,
.close = lead_decode_end,
FF_CODEC_DECODE_CB(lead_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
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