diff ffmpeg/libavcodec/fraps.c @ 10:6840f77b83aa

commit

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ffmpeg/libavcodec/fraps.c	Sun Apr 21 10:55:35 2013 +0200
@@ -0,0 +1,315 @@
+/*
+ * 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 "dsputil.h"
+#include "internal.h"
+#include "thread.h"
+
+#define FPS_TAG MKTAG('F', 'P', 'S', 'x')
+
+/**
+ * local variable storage
+ */
+typedef struct FrapsContext {
+    AVCodecContext *avctx;
+    uint8_t *tmpbuf;
+    int tmpbuf_size;
+    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;
+
+    s->avctx  = avctx;
+    s->tmpbuf = NULL;
+
+    ff_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, 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, 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->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;
+            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;
+    uint8_t *out;
+
+    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 AVERROR_PATCHWELCOME;
+    }
+
+    buf += header_size;
+
+    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, "Fraps: 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, "Fraps: 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 ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_YUVJ420P;
+
+    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:
+        /* 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",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_FRAPS,
+    .priv_data_size = sizeof(FrapsContext),
+    .init           = decode_init,
+    .close          = decode_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
+    .long_name      = NULL_IF_CONFIG_SMALL("Fraps"),
+};