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FFmpeg/libavcodec/fraps.c
Andreas Rheinhardt 20f9727018 avcodec/codec_internal: Add FFCodec, hide internal part of AVCodec 
Up until now, codec.h contains both public and private parts
of AVCodec. This exposes the internals of AVCodec to users
and leads them into the temptation of actually using them
and forces us to forward-declare structures and types that
users can't use at all.

This commit changes this by adding a new structure FFCodec to
codec_internal.h that extends AVCodec, i.e. contains the public
AVCodec as first member; the private fields of AVCodec are moved
to this structure, leaving codec.h clean.

Reviewed-by: Anton Khirnov <anton@khirnov.net>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-03-21 01:33:09 +01:00

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/*
* Fraps FPS1 decoder
* Copyright (c) 2005 Roine Gustafsson
* Copyright (c) 2006 Konstantin Shishkov
*
* 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
* Lossless Fraps 'FPS1' decoder
* @author Roine Gustafsson (roine at users sf net)
* @author Konstantin Shishkov
*
* Codec algorithm for version 0 is taken from Transcode <www.transcoding.org>
*
* Version 2 files support by Konstantin Shishkov
*/
#include "config.h"
#define CACHED_BITSTREAM_READER HAVE_FAST_64BIT
#define UNCHECKED_BITSTREAM_READER 1
#include "avcodec.h"
#include "get_bits.h"
#include "huffman.h"
#include "bytestream.h"
#include "bswapdsp.h"
#include "codec_internal.h"
#include "thread.h"
#define FPS_TAG MKTAG('F', 'P', 'S', 'x')
#define VLC_BITS 11
/**
* local variable storage
*/
typedef struct FrapsContext {
AVCodecContext *avctx;
BswapDSPContext bdsp;
uint8_t *tmpbuf;
int tmpbuf_size;
} FrapsContext;
/**
* initializes decoder
* @param avctx codec context
* @return 0 on success or negative if fails
*/
static av_cold int decode_init(AVCodecContext *avctx)
{
FrapsContext * const s = avctx->priv_data;
s->avctx = avctx;
s->tmpbuf = NULL;
ff_bswapdsp_init(&s->bdsp);
return 0;
}
/**
* Comparator - our nodes should ascend by count
* but with preserved symbol order
*/
static int huff_cmp(const void *va, const void *vb)
{
const Node *a = va, *b = vb;
return (a->count - b->count)*256 + a->sym - b->sym;
}
/**
* decode Fraps v2 packed plane
*/
static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
int h, const uint8_t *src, int size, int Uoff,
const int step)
{
int i, j, ret;
GetBitContext gb;
VLC vlc;
Node nodes[512];
for (i = 0; i < 256; i++)
nodes[i].count = bytestream_get_le32(&src);
size -= 1024;
if ((ret = ff_huff_build_tree(s->avctx, &vlc, 256, VLC_BITS,
nodes, huff_cmp,
FF_HUFFMAN_FLAG_ZERO_COUNT)) < 0)
return ret;
/* we have built Huffman table and are ready to decode plane */
/* convert bits so they may be used by standard bitreader */
s->bdsp.bswap_buf((uint32_t *) s->tmpbuf,
(const uint32_t *) src, size >> 2);
if ((ret = init_get_bits8(&gb, s->tmpbuf, size)) < 0)
return ret;
for (j = 0; j < h; j++) {
for (i = 0; i < w*step; i += step) {
dst[i] = get_vlc2(&gb, vlc.table, VLC_BITS, 3);
/* lines are stored as deltas between previous lines
* and we need to add 0x80 to the first lines of chroma planes
*/
if (j)
dst[i] += dst[i - stride];
else if (Uoff)
dst[i] += 0x80;
if (get_bits_left(&gb) < 0) {
ff_free_vlc(&vlc);
return AVERROR_INVALIDDATA;
}
}
dst += stride;
}
ff_free_vlc(&vlc);
return 0;
}
static int decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
FrapsContext * const s = avctx->priv_data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
AVFrame * const f = data;
uint32_t header;
unsigned int version,header_size;
unsigned int x, y;
const uint32_t *buf32;
uint32_t *luma1,*luma2,*cb,*cr;
uint32_t offs[4];
int i, j, ret, is_chroma;
const int planes = 3;
int is_pal;
uint8_t *out;
if (buf_size < 4) {
av_log(avctx, AV_LOG_ERROR, "Packet is too short\n");
return AVERROR_INVALIDDATA;
}
header = AV_RL32(buf);
version = header & 0xff;
is_pal = buf[1] == 2 && version == 1;
header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
if (version > 5) {
avpriv_report_missing_feature(avctx, "Fraps version %u", version);
return AVERROR_PATCHWELCOME;
}
buf += header_size;
if (is_pal) {
unsigned needed_size = avctx->width * avctx->height + 1024;
needed_size += header_size;
if (buf_size != needed_size) {
av_log(avctx, AV_LOG_ERROR,
"Invalid frame length %d (should be %d)\n",
buf_size, needed_size);
return AVERROR_INVALIDDATA;
}
} else if (version < 2) {
unsigned needed_size = avctx->width * avctx->height * 3;
if (version == 0) needed_size /= 2;
needed_size += header_size;
/* bit 31 means same as previous pic */
if (header & (1U<<31)) {
*got_frame = 0;
return buf_size;
}
if (buf_size != needed_size) {
av_log(avctx, AV_LOG_ERROR,
"Invalid frame length %d (should be %d)\n",
buf_size, needed_size);
return AVERROR_INVALIDDATA;
}
} else {
/* skip frame */
if (buf_size == 8) {
*got_frame = 0;
return buf_size;
}
if (AV_RL32(buf) != FPS_TAG || buf_size < planes*1024 + 24) {
av_log(avctx, AV_LOG_ERROR, "error in data stream\n");
return AVERROR_INVALIDDATA;
}
for (i = 0; i < planes; i++) {
offs[i] = AV_RL32(buf + 4 + i * 4);
if (offs[i] >= buf_size - header_size || (i && offs[i] <= offs[i - 1] + 1024)) {
av_log(avctx, AV_LOG_ERROR, "plane %i offset is out of bounds\n", i);
return AVERROR_INVALIDDATA;
}
}
offs[planes] = buf_size - header_size;
for (i = 0; i < planes; i++) {
av_fast_padded_malloc(&s->tmpbuf, &s->tmpbuf_size, offs[i + 1] - offs[i] - 1024);
if (!s->tmpbuf)
return AVERROR(ENOMEM);
}
}
f->pict_type = AV_PICTURE_TYPE_I;
f->key_frame = 1;
avctx->pix_fmt = version & 1 ? is_pal ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_BGR24 : AV_PIX_FMT_YUVJ420P;
avctx->color_range = version & 1 ? AVCOL_RANGE_UNSPECIFIED
: AVCOL_RANGE_JPEG;
avctx->colorspace = version & 1 ? AVCOL_SPC_UNSPECIFIED : AVCOL_SPC_BT709;
if ((ret = ff_thread_get_buffer(avctx, f, 0)) < 0)
return ret;
switch (version) {
case 0:
default:
/* Fraps v0 is a reordered YUV420 */
if (((avctx->width % 8) != 0) || ((avctx->height % 2) != 0)) {
av_log(avctx, AV_LOG_ERROR, "Invalid frame size %dx%d\n",
avctx->width, avctx->height);
return AVERROR_INVALIDDATA;
}
buf32 = (const uint32_t*)buf;
for (y = 0; y < avctx->height / 2; y++) {
luma1 = (uint32_t*)&f->data[0][ y * 2 * f->linesize[0] ];
luma2 = (uint32_t*)&f->data[0][ (y * 2 + 1) * f->linesize[0] ];
cr = (uint32_t*)&f->data[1][ y * f->linesize[1] ];
cb = (uint32_t*)&f->data[2][ y * f->linesize[2] ];
for (x = 0; x < avctx->width; x += 8) {
*luma1++ = *buf32++;
*luma1++ = *buf32++;
*luma2++ = *buf32++;
*luma2++ = *buf32++;
*cr++ = *buf32++;
*cb++ = *buf32++;
}
}
break;
case 1:
if (is_pal) {
uint32_t *pal = (uint32_t *)f->data[1];
for (y = 0; y < 256; y++) {
pal[y] = AV_RL32(buf) | 0xFF000000;
buf += 4;
}
for (y = 0; y <avctx->height; y++)
memcpy(&f->data[0][y * f->linesize[0]],
&buf[y * avctx->width],
avctx->width);
} else {
/* Fraps v1 is an upside-down BGR24 */
for (y = 0; y<avctx->height; y++)
memcpy(&f->data[0][(avctx->height - y - 1) * f->linesize[0]],
&buf[y * avctx->width * 3],
3 * avctx->width);
}
break;
case 2:
case 4:
/**
* Fraps v2 is Huffman-coded YUV420 planes
* Fraps v4 is virtually the same
*/
for (i = 0; i < planes; i++) {
is_chroma = !!i;
if ((ret = fraps2_decode_plane(s, f->data[i], f->linesize[i],
avctx->width >> is_chroma,
avctx->height >> is_chroma,
buf + offs[i], offs[i + 1] - offs[i],
is_chroma, 1)) < 0) {
av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
return ret;
}
}
break;
case 3:
case 5:
/* Virtually the same as version 4, but is for RGB24 */
for (i = 0; i < planes; i++) {
if ((ret = fraps2_decode_plane(s, f->data[0] + i + (f->linesize[0] * (avctx->height - 1)),
-f->linesize[0], avctx->width, avctx->height,
buf + offs[i], offs[i + 1] - offs[i], 0, 3)) < 0) {
av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
return ret;
}
}
out = f->data[0];
// convert pseudo-YUV into real RGB
for (j = 0; j < avctx->height; j++) {
uint8_t *line_end = out + 3*avctx->width;
while (out < line_end) {
out[0] += out[1];
out[2] += out[1];
out += 3;
}
out += f->linesize[0] - 3*avctx->width;
}
break;
}
*got_frame = 1;
return buf_size;
}
/**
* closes decoder
* @param avctx codec context
* @return 0 on success or negative if fails
*/
static av_cold int decode_end(AVCodecContext *avctx)
{
FrapsContext *s = (FrapsContext*)avctx->priv_data;
av_freep(&s->tmpbuf);
return 0;
}
const FFCodec ff_fraps_decoder = {
.p.name = "fraps",
.p.long_name = NULL_IF_CONFIG_SMALL("Fraps"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_FRAPS,
.priv_data_size = sizeof(FrapsContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
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