/libavcodec/fraps.c
http://github.com/FFmpeg/FFmpeg · C · 352 lines · 249 code · 37 blank · 66 comment · 55 complexity · 0b3911eb236d290f56f4d16f1b9292f2 MD5 · raw file
- /*
- * 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 "avcodec.h"
- #include "get_bits.h"
- #include "huffman.h"
- #include "bytestream.h"
- #include "bswapdsp.h"
- #include "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;
- ThreadFrame frame = { .f = data };
- 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, &frame, 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;
- }
- AVCodec ff_fraps_decoder = {
- .name = "fraps",
- .long_name = NULL_IF_CONFIG_SMALL("Fraps"),
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_FRAPS,
- .priv_data_size = sizeof(FrapsContext),
- .init = decode_init,
- .close = decode_end,
- .decode = decode_frame,
- .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
- .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
- };