Ut Video decoder

Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 460 insertions, 0 deletions

diff --git a/libavcodec/utvideo.c b/libavcodec/utvideo.c
new file mode 100644
index 0000000000..aac3969b15
--- /dev/null
+++ b/libavcodec/utvideo.c
@@ -0,0 +1,460 @@
+/*
+ * Ut Video decoder
+ * Copyright (c) 2011 Konstantin Shishkov
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Ut Video decoder
+ */
+
+#include <stdlib.h>
+
+#include "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "get_bits.h"
+#include "dsputil.h"
+
+enum {
+    PRED_NONE = 0,
+    PRED_LEFT,
+    PRED_GRADIENT,
+    PRED_MEDIAN,
+};
+
+typedef struct UtvideoContext {
+    AVCodecContext *avctx;
+    AVFrame pic;
+    DSPContext dsp;
+
+    uint32_t frame_info_size, flags, frame_info;
+    int planes;
+    int slices;
+    int compression;
+    int interlaced;
+    int frame_pred;
+
+    uint8_t *slice_bits;
+    int slice_bits_size;
+} UtvideoContext;
+
+typedef struct HuffEntry {
+    uint8_t sym;
+    uint8_t len;
+} HuffEntry;
+
+static int huff_cmp(const void *a, const void *b)
+{
+    const HuffEntry *aa = a, *bb = b;
+    return (aa->len - bb->len)*256 + aa->sym - bb->sym;
+}
+
+static int build_huff(const uint8_t *src, VLC *vlc)
+{
+    int i;
+    HuffEntry he[256];
+    int last;
+    uint32_t codes[256];
+    uint8_t bits[256];
+    uint8_t syms[256];
+    uint32_t code;
+
+    for (i = 0; i < 256; i++) {
+        he[i].sym = i;
+        he[i].len = *src++;
+    }
+    qsort(he, 256, sizeof(*he), huff_cmp);
+
+    if (!he[0].len || he[0].len > 32)
+        return -1;
+
+    last = 255;
+    while (he[last].len == 255 && last)
+        last--;
+
+    code = 1;
+    for (i = last; i >= 0; i--) {
+        codes[i] = code >> (32 - he[i].len);
+        bits[i]  = he[i].len;
+        syms[i]  = he[i].sym;
+        code += 0x80000000u >> (he[i].len - 1);
+    }
+
+    return init_vlc_sparse(vlc, FFMIN(he[last].len, 9), last + 1,
+                           bits,  sizeof(*bits),  sizeof(*bits),
+                           codes, sizeof(*codes), sizeof(*codes),
+                           syms,  sizeof(*syms),  sizeof(*syms), 0);
+}
+
+static int decode_plane(UtvideoContext *c, int plane_no,
+                        uint8_t *dst, int step, int stride,
+                        int width, int height,
+                        const uint8_t *src, int src_size, int use_pred)
+{
+    int i, j, slice, pix;
+    int sstart, send;
+    VLC vlc;
+    GetBitContext gb;
+    int prev;
+
+    if (build_huff(src, &vlc)) {
+        av_log(c->avctx, AV_LOG_ERROR, "Cannot build Huffman codes\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    src      += 256;
+    src_size -= 256;
+
+    send = 0;
+    for (slice = 0; slice < c->slices; slice++) {
+        uint8_t *dest;
+        int slice_data_start, slice_data_end, slice_size;
+
+        sstart = send;
+        send   = height * (slice + 1) / c->slices;
+        dest   = dst + sstart * stride;
+
+        // slice offset and size validation was done earlier
+        slice_data_start = slice ? AV_RL32(src + slice * 4 - 4) : 0;
+        slice_data_end   = AV_RL32(src + slice * 4);
+        slice_size       = slice_data_end - slice_data_start;
+
+        if (!slice_size) {
+            for (j = sstart; j < send; j++) {
+                for (i = 0; i < width * step; i += step)
+                    dest[i] = 0x80;
+                dest += stride;
+            }
+            continue;
+        }
+
+        memcpy(c->slice_bits, src + slice_data_start + c->slices * 4, slice_size);
+        memset(c->slice_bits + slice_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+        c->dsp.bswap_buf((uint32_t*)c->slice_bits, (uint32_t*)c->slice_bits,
+                         (slice_data_end - slice_data_start + 3) >> 2);
+        init_get_bits(&gb, c->slice_bits, slice_size * 8);
+
+        prev = 0x80;
+        for (j = sstart; j < send; j++) {
+            for (i = 0; i < width * step; i += step) {
+                if (get_bits_left(&gb) <= 0) {
+                    av_log(c->avctx, AV_LOG_ERROR, "Slice decoding ran out of bits\n");
+                    goto fail;
+                }
+                pix = get_vlc2(&gb, vlc.table, vlc.bits, 4);
+                if (pix < 0) {
+                    av_log(c->avctx, AV_LOG_ERROR, "Decoding error\n");
+                    goto fail;
+                }
+                if (use_pred) {
+                    prev += pix;
+                    pix   = prev;
+                }
+                dest[i] = pix;
+            }
+            dest += stride;
+        }
+        if (get_bits_left(&gb) > 32)
+            av_log(c->avctx, AV_LOG_WARNING, "%d bits left after decoding slice\n",
+                   get_bits_left(&gb));
+    }
+
+    free_vlc(&vlc);
+
+    return 0;
+fail:
+    free_vlc(&vlc);
+    return AVERROR_INVALIDDATA;
+}
+
+static const int rgb_order[4] = { 1, 2, 0, 3 };
+
+static void restore_rgb_planes(uint8_t *src, int step, int stride, int width, int height)
+{
+    int i, j;
+    uint8_t r, g, b;
+
+    for (j = 0; j < height; j++) {
+        for (i = 0; i < width * step; i += step) {
+            r = src[i];
+            g = src[i + 1];
+            b = src[i + 2];
+            src[i]     = r + g - 0x80;
+            src[i + 2] = b + g - 0x80;
+        }
+        src += stride;
+    }
+}
+
+static void restore_median(uint8_t *src, int step, int stride,
+                           int width, int height, int slices)
+{
+    int i, j, slice;
+    int A, B, C;
+    uint8_t *bsrc;
+    int slice_start, slice_height;
+
+    for (slice = 0; slice < slices; slice++) {
+        slice_start = (slice * height) / slices;
+        slice_height = ((slice + 1) * height) / slices - slice_start;
+
+        bsrc = src + slice_start * stride;
+
+        // first line - left neighbour prediction
+        bsrc[0] += 0x80;
+        A = bsrc[0];
+        for (i = step; i < width * step; i += step) {
+            bsrc[i] += A;
+            A = bsrc[i];
+        }
+        bsrc += stride;
+        if (slice_height == 1)
+            continue;
+        // second line - first element has top predition, the rest uses median
+        C = bsrc[-stride];
+        bsrc[0] += C;
+        A = bsrc[0];
+        for (i = step; i < width * step; i += step) {
+            B = bsrc[i - stride];
+            bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C));
+            C = B;
+            A = bsrc[i];
+        }
+        bsrc += stride;
+        // the rest of lines use continuous median prediction
+        for (j = 2; j < slice_height; j++) {
+            for (i = 0; i < width * step; i += step) {
+                B = bsrc[i - stride];
+                bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C));
+                C = B;
+                A = bsrc[i];
+            }
+            bsrc += stride;
+        }
+    }
+}
+
+static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    const uint8_t *buf_end = buf + buf_size;
+    UtvideoContext *c = avctx->priv_data;
+    const uint8_t *ptr;
+    int i, j;
+    const uint8_t *plane_start[5];
+    int plane_size, max_slice_size = 0, slice_start, slice_end, slice_size;
+    int ret;
+
+    if (c->pic.data[0])
+        avctx->release_buffer(avctx, &c->pic);
+
+    c->pic.reference = 1;
+    c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
+    if ((ret = avctx->get_buffer(avctx, &c->pic)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return ret;
+    }
+
+    /* parse plane structure to retrieve frame flags and validate slice offsets */
+    ptr = buf;
+    for (i = 0; i < c->planes; i++) {
+        plane_start[i] = ptr;
+        if (buf_end - ptr < 256 + 4 * c->slices) {
+            av_log(avctx, AV_LOG_ERROR, "Insufficient data for a plane\n");
+            return AVERROR_INVALIDDATA;
+        }
+        ptr += 256;
+        slice_start = 0;
+        slice_end   = 0;
+        for (j = 0; j < c->slices; j++) {
+            slice_end   = bytestream_get_le32(&ptr);
+            slice_size  = slice_end - slice_start;
+            if (slice_size < 0) {
+                av_log(avctx, AV_LOG_ERROR, "Incorrect slice size\n");
+                return AVERROR_INVALIDDATA;
+            }
+            slice_start = slice_end;
+            max_slice_size = FFMAX(max_slice_size, slice_size);
+        }
+        plane_size = slice_end;
+        if (buf_end - ptr < plane_size) {
+            av_log(avctx, AV_LOG_ERROR, "Plane size is bigger than available data\n");
+            return AVERROR_INVALIDDATA;
+        }
+        ptr += plane_size;
+    }
+    plane_start[c->planes] = ptr;
+    if (buf_end - ptr < c->frame_info_size) {
+        av_log(avctx, AV_LOG_ERROR, "Not enough data for frame information\n");
+        return AVERROR_INVALIDDATA;
+    }
+    c->frame_info = AV_RL32(ptr);
+    av_log(avctx, AV_LOG_DEBUG, "frame information flags %X\n", c->frame_info);
+
+    c->frame_pred = (c->frame_info >> 8) & 3;
+
+    if (c->frame_pred == PRED_GRADIENT) {
+        av_log_ask_for_sample(avctx, "Frame uses gradient prediction\n");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    av_fast_malloc(&c->slice_bits, &c->slice_bits_size,
+                   max_slice_size + FF_INPUT_BUFFER_PADDING_SIZE);
+
+    if (!c->slice_bits) {
+        av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
+        return AVERROR(ENOMEM);
+    }
+
+    switch (c->avctx->pix_fmt) {
+    case PIX_FMT_RGB24:
+    case PIX_FMT_RGBA:
+        for (i = 0; i < c->planes; i++) {
+            ret = decode_plane(c, i, c->pic.data[0] + rgb_order[i], c->planes,
+                               c->pic.linesize[0], avctx->width, avctx->height,
+                               plane_start[i], plane_start[i + 1] - plane_start[i],
+                               c->frame_pred == PRED_LEFT);
+            if (ret)
+                return ret;
+            if (c->frame_pred == PRED_MEDIAN)
+                restore_median(c->pic.data[0] + rgb_order[i], c->planes,
+                               c->pic.linesize[0], avctx->width, avctx->height,
+                               c->slices);
+        }
+        restore_rgb_planes(c->pic.data[0], c->planes, c->pic.linesize[0],
+                           avctx->width, avctx->height);
+        break;
+    case PIX_FMT_YUV420P:
+        for (i = 0; i < 3; i++) {
+            ret = decode_plane(c, i, c->pic.data[i], 1,
+                               c->pic.linesize[i], avctx->width >> !!i, avctx->height >> !!i,
+                               plane_start[i], plane_start[i + 1] - plane_start[i],
+                               c->frame_pred == PRED_LEFT);
+            if (ret)
+                return ret;
+            if (c->frame_pred == PRED_MEDIAN)
+                restore_median(c->pic.data[i], 1, c->pic.linesize[i],
+                               avctx->width >> !!i, avctx->height >> !!i,
+                               c->slices);
+        }
+        break;
+    case PIX_FMT_YUV422P:
+        for (i = 0; i < 3; i++) {
+            ret = decode_plane(c, i, c->pic.data[i], 1,
+                               c->pic.linesize[i], avctx->width >> !!i, avctx->height,
+                               plane_start[i], plane_start[i + 1] - plane_start[i],
+                               c->frame_pred == PRED_LEFT);
+            if (ret)
+                return ret;
+            if (c->frame_pred == PRED_MEDIAN)
+                restore_median(c->pic.data[i], 1, c->pic.linesize[i],
+                               avctx->width >> !!i, avctx->height, c->slices);
+        }
+        break;
+    }
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = c->pic;
+
+    /* always report that the buffer was completely consumed */
+    return buf_size;
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+    UtvideoContext * const c = avctx->priv_data;
+
+    c->avctx = avctx;
+
+    dsputil_init(&c->dsp, avctx);
+
+    if (avctx->extradata_size < 16) {
+        av_log(avctx, AV_LOG_ERROR, "Insufficient extradata size %d, should be at least 16\n",
+               avctx->extradata_size);
+        return AVERROR_INVALIDDATA;
+    }
+
+    av_log(avctx, AV_LOG_DEBUG, "Encoder version %d.%d.%d.%d\n",
+           avctx->extradata[3], avctx->extradata[2],
+           avctx->extradata[1], avctx->extradata[0]);
+    av_log(avctx, AV_LOG_DEBUG, "Original format %X\n", AV_RB32(avctx->extradata + 4));
+    c->frame_info_size = AV_RL32(avctx->extradata + 8);
+    c->flags           = AV_RL32(avctx->extradata + 12);
+
+    if (c->frame_info_size != 4)
+        av_log_ask_for_sample(avctx, "Frame info is not 4 bytes\n");
+    av_log(avctx, AV_LOG_DEBUG, "Encoding parameters %08X\n", c->flags);
+    c->slices      = (c->flags >> 24) + 1;
+    c->compression = c->flags & 1;
+    c->interlaced  = c->flags & 0x800;
+
+    c->slice_bits_size = 0;
+
+    switch (avctx->codec_tag) {
+    case MKTAG('U', 'L', 'R', 'G'):
+        c->planes      = 3;
+        avctx->pix_fmt = PIX_FMT_RGB24;
+        break;
+    case MKTAG('U', 'L', 'R', 'A'):
+        c->planes      = 4;
+        avctx->pix_fmt = PIX_FMT_RGBA;
+        break;
+    case MKTAG('U', 'L', 'Y', '0'):
+        c->planes      = 3;
+        avctx->pix_fmt = PIX_FMT_YUV420P;
+        break;
+    case MKTAG('U', 'L', 'Y', '2'):
+        c->planes      = 3;
+        avctx->pix_fmt = PIX_FMT_YUV422P;
+        break;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "Unknown Ut Video FOURCC provided (%08X)\n",
+               avctx->codec_tag);
+        return AVERROR_INVALIDDATA;
+    }
+
+    return 0;
+}
+
+static av_cold int decode_end(AVCodecContext *avctx)
+{
+    UtvideoContext * const c = avctx->priv_data;
+
+    if (c->pic.data[0])
+        avctx->release_buffer(avctx, &c->pic);
+
+    av_freep(&c->slice_bits);
+
+    return 0;
+}
+
+AVCodec ff_utvideo_decoder = {
+    .name           = "utvideo",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = CODEC_ID_UTVIDEO,
+    .priv_data_size = sizeof(UtvideoContext),
+    .init           = decode_init,
+    .close          = decode_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("Ut Video"),
+};
+