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