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FFmpeg/libavcodec/cdxl.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks 
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

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/*
* CDXL video decoder
* Copyright (c) 2011-2012 Paul B Mahol
*
* 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
* Commodore CDXL video decoder
* @author Paul B Mahol
*/
#define UNCHECKED_BITSTREAM_READER 1
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "codec_internal.h"
#include "get_bits.h"
#include "internal.h"
#define BIT_PLANAR 0x00
#define CHUNKY 0x20
#define BYTE_PLANAR 0x40
#define BIT_LINE 0x80
#define BYTE_LINE 0xC0
typedef struct CDXLVideoContext {
AVCodecContext *avctx;
int bpp;
int type;
int format;
int padded_bits;
const uint8_t *palette;
int palette_size;
const uint8_t *video;
int video_size;
uint8_t *new_video;
int new_video_size;
} CDXLVideoContext;
static av_cold int cdxl_decode_init(AVCodecContext *avctx)
{
CDXLVideoContext *c = avctx->priv_data;
c->new_video_size = 0;
c->avctx = avctx;
return 0;
}
static void import_palette(CDXLVideoContext *c, uint32_t *new_palette)
{
if (c->type == 1) {
for (int i = 0; i < c->palette_size / 2; i++) {
unsigned rgb = AV_RB16(&c->palette[i * 2]);
unsigned r = ((rgb >> 8) & 0xF) * 0x11;
unsigned g = ((rgb >> 4) & 0xF) * 0x11;
unsigned b = (rgb & 0xF) * 0x11;
AV_WN32(&new_palette[i], (0xFFU << 24) | (r << 16) | (g << 8) | b);
}
} else {
for (int i = 0; i < c->palette_size / 3; i++) {
unsigned rgb = AV_RB24(&c->palette[i * 3]);
AV_WN32(&new_palette[i], (0xFFU << 24) | rgb);
}
}
}
static void bitplanar2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
{
GetBitContext gb;
int x, y, plane;
if (init_get_bits8(&gb, c->video, c->video_size) < 0)
return;
for (plane = 0; plane < c->bpp; plane++) {
for (y = 0; y < c->avctx->height; y++) {
for (x = 0; x < c->avctx->width; x++)
out[linesize * y + x] |= get_bits1(&gb) << plane;
skip_bits(&gb, c->padded_bits);
}
}
}
static void bitline2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
{
GetBitContext gb;
int x, y, plane;
if (init_get_bits8(&gb, c->video, c->video_size) < 0)
return;
for (y = 0; y < c->avctx->height; y++) {
for (plane = 0; plane < c->bpp; plane++) {
for (x = 0; x < c->avctx->width; x++)
out[linesize * y + x] |= get_bits1(&gb) << plane;
skip_bits(&gb, c->padded_bits);
}
}
}
static void chunky2chunky(CDXLVideoContext *c, int linesize, uint8_t *out)
{
GetByteContext gb;
int y;
bytestream2_init(&gb, c->video, c->video_size);
for (y = 0; y < c->avctx->height; y++) {
bytestream2_get_buffer(&gb, out + linesize * y, c->avctx->width * 3);
}
}
static void import_format(CDXLVideoContext *c, int linesize, uint8_t *out)
{
memset(out, 0, linesize * c->avctx->height);
switch (c->format) {
case BIT_PLANAR:
bitplanar2chunky(c, linesize, out);
break;
case BIT_LINE:
bitline2chunky(c, linesize, out);
break;
case CHUNKY:
chunky2chunky(c, linesize, out);
break;
}
}
static void cdxl_decode_rgb(CDXLVideoContext *c, AVFrame *frame)
{
uint32_t *new_palette = (uint32_t *)frame->data[1];
memset(frame->data[1], 0, AVPALETTE_SIZE);
import_palette(c, new_palette);
import_format(c, frame->linesize[0], frame->data[0]);
}
static void cdxl_decode_raw(CDXLVideoContext *c, AVFrame *frame)
{
import_format(c, frame->linesize[0], frame->data[0]);
}
static void cdxl_decode_ham6(CDXLVideoContext *c, AVFrame *frame)
{
AVCodecContext *avctx = c->avctx;
uint32_t new_palette[16], r, g, b;
uint8_t *ptr, *out, index, op;
int x, y;
ptr = c->new_video;
out = frame->data[0];
import_palette(c, new_palette);
import_format(c, avctx->width, c->new_video);
for (y = 0; y < avctx->height; y++) {
r = new_palette[0] & 0xFF0000;
g = new_palette[0] & 0xFF00;
b = new_palette[0] & 0xFF;
for (x = 0; x < avctx->width; x++) {
index = *ptr++;
op = index >> 4;
index &= 15;
switch (op) {
case 0:
r = new_palette[index] & 0xFF0000;
g = new_palette[index] & 0xFF00;
b = new_palette[index] & 0xFF;
break;
case 1:
b = index * 0x11;
break;
case 2:
r = index * 0x11 << 16;
break;
case 3:
g = index * 0x11 << 8;
break;
}
AV_WL24(out + x * 3, r | g | b);
}
out += frame->linesize[0];
}
}
static void cdxl_decode_ham8(CDXLVideoContext *c, AVFrame *frame)
{
AVCodecContext *avctx = c->avctx;
uint32_t new_palette[64], r, g, b;
uint8_t *ptr, *out, index, op;
int x, y;
ptr = c->new_video;
out = frame->data[0];
import_palette(c, new_palette);
import_format(c, avctx->width, c->new_video);
for (y = 0; y < avctx->height; y++) {
r = new_palette[0] & 0xFF0000;
g = new_palette[0] & 0xFF00;
b = new_palette[0] & 0xFF;
for (x = 0; x < avctx->width; x++) {
index = *ptr++;
op = index >> 6;
index &= 63;
switch (op) {
case 0:
r = new_palette[index] & 0xFF0000;
g = new_palette[index] & 0xFF00;
b = new_palette[index] & 0xFF;
break;
case 1:
b = (index << 2) | (b & 3);
break;
case 2:
r = (index << 18) | (r & (3 << 16));
break;
case 3:
g = (index << 10) | (g & (3 << 8));
break;
}
AV_WL24(out + x * 3, r | g | b);
}
out += frame->linesize[0];
}
}
static int cdxl_decode_frame(AVCodecContext *avctx, AVFrame *p,
int *got_frame, AVPacket *pkt)
{
CDXLVideoContext *c = avctx->priv_data;
int ret, w, h, encoding, aligned_width, buf_size = pkt->size;
const uint8_t *buf = pkt->data;
if (buf_size < 32)
return AVERROR_INVALIDDATA;
c->type = buf[0];
encoding = buf[1] & 7;
c->format = buf[1] & 0xE0;
w = AV_RB16(&buf[14]);
h = AV_RB16(&buf[16]);
c->bpp = buf[19];
c->palette_size = AV_RB16(&buf[20]);
c->palette = buf + 32;
c->video = c->palette + c->palette_size;
c->video_size = buf_size - c->palette_size - 32;
if (c->type > 1)
return AVERROR_INVALIDDATA;
if (c->type == 1 && c->palette_size > 512)
return AVERROR_INVALIDDATA;
if (c->type == 0 && c->palette_size > 768)
return AVERROR_INVALIDDATA;
if (buf_size < c->palette_size + 32)
return AVERROR_INVALIDDATA;
if (c->bpp < 1)
return AVERROR_INVALIDDATA;
if (c->format != BIT_PLANAR && c->format != BIT_LINE && c->format != CHUNKY) {
avpriv_request_sample(avctx, "Pixel format 0x%0x", c->format);
return AVERROR_PATCHWELCOME;
}
if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
return ret;
if (c->format == CHUNKY)
aligned_width = avctx->width;
else
aligned_width = FFALIGN(c->avctx->width, 16);
c->padded_bits = aligned_width - c->avctx->width;
if (c->video_size < aligned_width * avctx->height * (int64_t)c->bpp / 8)
return AVERROR_INVALIDDATA;
if (!encoding && c->palette_size && c->bpp <= 8 && c->format != CHUNKY) {
avctx->pix_fmt = AV_PIX_FMT_PAL8;
} else if (encoding == 1 && (c->bpp == 6 || c->bpp == 8) && c->format != CHUNKY) {
if (c->palette_size != (1 << (c->bpp - 1)))
return AVERROR_INVALIDDATA;
avctx->pix_fmt = AV_PIX_FMT_BGR24;
} else if (!encoding && c->bpp == 24 && c->format == CHUNKY &&
!c->palette_size) {
avctx->pix_fmt = AV_PIX_FMT_RGB24;
} else {
avpriv_request_sample(avctx, "Encoding %d, bpp %d and format 0x%x",
encoding, c->bpp, c->format);
return AVERROR_PATCHWELCOME;
}
if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
return ret;
p->pict_type = AV_PICTURE_TYPE_I;
p->key_frame = 1;
if (encoding) {
av_fast_padded_malloc(&c->new_video, &c->new_video_size,
h * w + AV_INPUT_BUFFER_PADDING_SIZE);
if (!c->new_video)
return AVERROR(ENOMEM);
if (c->bpp == 8)
cdxl_decode_ham8(c, p);
else
cdxl_decode_ham6(c, p);
} else if (avctx->pix_fmt == AV_PIX_FMT_PAL8) {
cdxl_decode_rgb(c, p);
} else {
cdxl_decode_raw(c, p);
}
*got_frame = 1;
return buf_size;
}
static av_cold int cdxl_decode_end(AVCodecContext *avctx)
{
CDXLVideoContext *c = avctx->priv_data;
av_freep(&c->new_video);
return 0;
}
const FFCodec ff_cdxl_decoder = {
.p.name = "cdxl",
.p.long_name = NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_CDXL,
.priv_data_size = sizeof(CDXLVideoContext),
.init = cdxl_decode_init,
.close = cdxl_decode_end,
FF_CODEC_DECODE_CB(cdxl_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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