| /* |
| * 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 libavcodec/fraps.c |
| * 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 "bitstream.h" |
| #include "huffman.h" |
| #include "bytestream.h" |
| #include "dsputil.h" |
| |
| #define FPS_TAG MKTAG('F', 'P', 'S', 'x') |
| |
| /** |
| * local variable storage |
| */ |
| typedef struct FrapsContext{ |
| AVCodecContext *avctx; |
| AVFrame frame; |
| uint8_t *tmpbuf; |
| DSPContext dsp; |
| } 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; |
| |
| avctx->coded_frame = (AVFrame*)&s->frame; |
| avctx->pix_fmt= PIX_FMT_NONE; /* set in decode_frame */ |
| |
| s->avctx = avctx; |
| s->frame.data[0] = NULL; |
| s->tmpbuf = NULL; |
| |
| dsputil_init(&s->dsp, avctx); |
| |
| 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; |
| GetBitContext gb; |
| VLC vlc; |
| Node nodes[512]; |
| |
| for(i = 0; i < 256; i++) |
| nodes[i].count = bytestream_get_le32(&src); |
| size -= 1024; |
| if (ff_huff_build_tree(s->avctx, &vlc, 256, nodes, huff_cmp, |
| FF_HUFFMAN_FLAG_ZERO_COUNT) < 0) |
| return -1; |
| /* we have built Huffman table and are ready to decode plane */ |
| |
| /* convert bits so they may be used by standard bitreader */ |
| s->dsp.bswap_buf((uint32_t *)s->tmpbuf, (const uint32_t *)src, size >> 2); |
| |
| init_get_bits(&gb, s->tmpbuf, size * 8); |
| for(j = 0; j < h; j++){ |
| for(i = 0; i < w*step; i += step){ |
| dst[i] = get_vlc2(&gb, vlc.table, 9, 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; |
| } |
| dst += stride; |
| } |
| free_vlc(&vlc); |
| return 0; |
| } |
| |
| /** |
| * decode a frame |
| * @param avctx codec context |
| * @param data output AVFrame |
| * @param data_size size of output data or 0 if no picture is returned |
| * @param buf input data frame |
| * @param buf_size size of input data frame |
| * @return number of consumed bytes on success or negative if decode fails |
| */ |
| static int decode_frame(AVCodecContext *avctx, |
| void *data, int *data_size, |
| const uint8_t *buf, int buf_size) |
| { |
| FrapsContext * const s = avctx->priv_data; |
| AVFrame *frame = data; |
| AVFrame * const f = (AVFrame*)&s->frame; |
| 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, is_chroma, planes; |
| |
| |
| header = AV_RL32(buf); |
| version = header & 0xff; |
| header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */ |
| |
| if (version > 5) { |
| av_log(avctx, AV_LOG_ERROR, |
| "This file is encoded with Fraps version %d. " \ |
| "This codec can only decode versions <= 5.\n", version); |
| return -1; |
| } |
| |
| buf+=4; |
| if (header_size == 8) |
| buf+=4; |
| |
| switch(version) { |
| case 0: |
| default: |
| /* Fraps v0 is a reordered YUV420 */ |
| avctx->pix_fmt = PIX_FMT_YUV420P; |
| |
| if ( (buf_size != avctx->width*avctx->height*3/2+header_size) && |
| (buf_size != header_size) ) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Invalid frame length %d (should be %d)\n", |
| buf_size, avctx->width*avctx->height*3/2+header_size); |
| return -1; |
| } |
| |
| 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 -1; |
| } |
| |
| f->reference = 1; |
| f->buffer_hints = FF_BUFFER_HINTS_VALID | |
| FF_BUFFER_HINTS_PRESERVE | |
| FF_BUFFER_HINTS_REUSABLE; |
| if (avctx->reget_buffer(avctx, f)) { |
| av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); |
| return -1; |
| } |
| /* bit 31 means same as previous pic */ |
| f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE; |
| f->key_frame = f->pict_type == FF_I_TYPE; |
| |
| if (f->pict_type == FF_I_TYPE) { |
| 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: |
| /* Fraps v1 is an upside-down BGR24 */ |
| avctx->pix_fmt = PIX_FMT_BGR24; |
| |
| if ( (buf_size != avctx->width*avctx->height*3+header_size) && |
| (buf_size != header_size) ) { |
| av_log(avctx, AV_LOG_ERROR, |
| "Invalid frame length %d (should be %d)\n", |
| buf_size, avctx->width*avctx->height*3+header_size); |
| return -1; |
| } |
| |
| f->reference = 1; |
| f->buffer_hints = FF_BUFFER_HINTS_VALID | |
| FF_BUFFER_HINTS_PRESERVE | |
| FF_BUFFER_HINTS_REUSABLE; |
| if (avctx->reget_buffer(avctx, f)) { |
| av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); |
| return -1; |
| } |
| /* bit 31 means same as previous pic */ |
| f->pict_type = (header & (1<<31))? FF_P_TYPE : FF_I_TYPE; |
| f->key_frame = f->pict_type == FF_I_TYPE; |
| |
| if (f->pict_type == FF_I_TYPE) { |
| for(y=0; y<avctx->height; y++) |
| memcpy(&f->data[0][ (avctx->height-y)*f->linesize[0] ], |
| &buf[y*avctx->width*3], |
| f->linesize[0]); |
| } |
| break; |
| |
| case 2: |
| case 4: |
| /** |
| * Fraps v2 is Huffman-coded YUV420 planes |
| * Fraps v4 is virtually the same |
| */ |
| avctx->pix_fmt = PIX_FMT_YUV420P; |
| planes = 3; |
| f->reference = 1; |
| f->buffer_hints = FF_BUFFER_HINTS_VALID | |
| FF_BUFFER_HINTS_PRESERVE | |
| FF_BUFFER_HINTS_REUSABLE; |
| if (avctx->reget_buffer(avctx, f)) { |
| av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); |
| return -1; |
| } |
| /* skip frame */ |
| if(buf_size == 8) { |
| f->pict_type = FF_P_TYPE; |
| f->key_frame = 0; |
| break; |
| } |
| f->pict_type = FF_I_TYPE; |
| f->key_frame = 1; |
| if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) { |
| av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n"); |
| return -1; |
| } |
| for(i = 0; i < planes; i++) { |
| offs[i] = AV_RL32(buf + 4 + i * 4); |
| if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) { |
| av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i); |
| return -1; |
| } |
| } |
| offs[planes] = buf_size; |
| for(i = 0; i < planes; i++){ |
| is_chroma = !!i; |
| s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE); |
| if(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 -1; |
| } |
| } |
| break; |
| case 3: |
| case 5: |
| /* Virtually the same as version 4, but is for RGB24 */ |
| avctx->pix_fmt = PIX_FMT_BGR24; |
| planes = 3; |
| f->reference = 1; |
| f->buffer_hints = FF_BUFFER_HINTS_VALID | |
| FF_BUFFER_HINTS_PRESERVE | |
| FF_BUFFER_HINTS_REUSABLE; |
| if (avctx->reget_buffer(avctx, f)) { |
| av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); |
| return -1; |
| } |
| /* skip frame */ |
| if(buf_size == 8) { |
| f->pict_type = FF_P_TYPE; |
| f->key_frame = 0; |
| break; |
| } |
| f->pict_type = FF_I_TYPE; |
| f->key_frame = 1; |
| if ((AV_RL32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) { |
| av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n"); |
| return -1; |
| } |
| for(i = 0; i < planes; i++) { |
| offs[i] = AV_RL32(buf + 4 + i * 4); |
| if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) { |
| av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i); |
| return -1; |
| } |
| } |
| offs[planes] = buf_size; |
| for(i = 0; i < planes; i++){ |
| s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE); |
| if(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 -1; |
| } |
| } |
| // convert pseudo-YUV into real RGB |
| for(j = 0; j < avctx->height; j++){ |
| for(i = 0; i < avctx->width; i++){ |
| f->data[0][0 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]]; |
| f->data[0][2 + i*3 + j*f->linesize[0]] += f->data[0][1 + i*3 + j*f->linesize[0]]; |
| } |
| } |
| break; |
| } |
| |
| *frame = *f; |
| *data_size = sizeof(AVFrame); |
| |
| 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; |
| |
| if (s->frame.data[0]) |
| avctx->release_buffer(avctx, &s->frame); |
| |
| av_freep(&s->tmpbuf); |
| return 0; |
| } |
| |
| |
| AVCodec fraps_decoder = { |
| "fraps", |
| CODEC_TYPE_VIDEO, |
| CODEC_ID_FRAPS, |
| sizeof(FrapsContext), |
| decode_init, |
| NULL, |
| decode_end, |
| decode_frame, |
| CODEC_CAP_DR1, |
| .long_name = NULL_IF_CONFIG_SMALL("Fraps"), |
| }; |
