adding ffmpeg specific version

1 files changed, 358 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/eatgv.c b/ffmpeg1/libavcodec/eatgv.c
new file mode 100644
index 0000000..54074b3
--- /dev/null
+++ b/ffmpeg1/libavcodec/eatgv.c
@@ -0,0 +1,358 @@
+/*
+ * Electronic Arts TGV Video Decoder
+ * Copyright (c) 2007-2008 Peter Ross
+ *
+ * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/**
+ * @file
+ * Electronic Arts TGV Video Decoder
+ * by Peter Ross (pross@xvid.org)
+ *
+ * Technical details here:
+ * http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGV
+ */
+
+#include "avcodec.h"
+#define BITSTREAM_READER_LE
+#include "get_bits.h"
+#include "internal.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/mem.h"
+
+#define EA_PREAMBLE_SIZE    8
+#define kVGT_TAG MKTAG('k', 'V', 'G', 'T')
+
+typedef struct TgvContext {
+    AVCodecContext *avctx;
+    AVFrame last_frame;
+    uint8_t *frame_buffer;
+    int width,height;
+    uint32_t palette[AVPALETTE_COUNT];
+
+    int (*mv_codebook)[2];
+    uint8_t (*block_codebook)[16];
+    int num_mvs;           ///< current length of mv_codebook
+    int num_blocks_packed; ///< current length of block_codebook
+} TgvContext;
+
+static av_cold int tgv_decode_init(AVCodecContext *avctx)
+{
+    TgvContext *s = avctx->priv_data;
+    s->avctx         = avctx;
+    avctx->time_base = (AVRational){1, 15};
+    avctx->pix_fmt   = AV_PIX_FMT_PAL8;
+    avcodec_get_frame_defaults(&s->last_frame);
+    return 0;
+}
+
+/**
+ * Unpack buffer
+ * @return 0 on success, -1 on critical buffer underflow
+ */
+static int unpack(const uint8_t *src, const uint8_t *src_end,
+                  uint8_t *dst, int width, int height)
+{
+    uint8_t *dst_end = dst + width*height;
+    int size, size1, size2, offset, run;
+    uint8_t *dst_start = dst;
+
+    if (src[0] & 0x01)
+        src += 5;
+    else
+        src += 2;
+
+    if (src_end - src < 3)
+        return AVERROR_INVALIDDATA;
+    size = AV_RB24(src);
+    src += 3;
+
+    while (size > 0 && src < src_end) {
+
+        /* determine size1 and size2 */
+        size1 = (src[0] & 3);
+        if (src[0] & 0x80) {  // 1
+            if (src[0] & 0x40 ) {  // 11
+                if (src[0] & 0x20) {  // 111
+                    if (src[0] < 0xFC)  // !(111111)
+                        size1 = (((src[0] & 31) + 1) << 2);
+                    src++;
+                    size2 = 0;
+                } else {  // 110
+                    offset = ((src[0] & 0x10) << 12) + AV_RB16(&src[1]) + 1;
+                    size2  = ((src[0] & 0xC) << 6) + src[3] + 5;
+                    src   += 4;
+                }
+            } else {  // 10
+                size1  = ((src[1] & 0xC0) >> 6);
+                offset = (AV_RB16(&src[1]) & 0x3FFF) + 1;
+                size2  = (src[0] & 0x3F) + 4;
+                src   += 3;
+            }
+        } else {  // 0
+            offset = ((src[0] & 0x60) << 3) + src[1] + 1;
+            size2  = ((src[0] & 0x1C) >> 2) + 3;
+            src   += 2;
+        }
+
+
+        /* fetch strip from src */
+        if (size1 > src_end - src)
+            break;
+
+        if (size1 > 0) {
+            size -= size1;
+            run   = FFMIN(size1, dst_end - dst);
+            memcpy(dst, src, run);
+            dst += run;
+            src += run;
+        }
+
+        if (size2 > 0) {
+            if (dst - dst_start < offset)
+                return 0;
+            size -= size2;
+            run   = FFMIN(size2, dst_end - dst);
+            av_memcpy_backptr(dst, offset, run);
+            dst += run;
+        }
+    }
+
+    return 0;
+}
+
+/**
+ * Decode inter-frame
+ * @return 0 on success, -1 on critical buffer underflow
+ */
+static int tgv_decode_inter(TgvContext *s, AVFrame *frame,
+                            const uint8_t *buf, const uint8_t *buf_end)
+{
+    int num_mvs;
+    int num_blocks_raw;
+    int num_blocks_packed;
+    int vector_bits;
+    int i,j,x,y;
+    GetBitContext gb;
+    int mvbits;
+    const uint8_t *blocks_raw;
+
+    if(buf_end - buf < 12)
+        return AVERROR_INVALIDDATA;
+
+    num_mvs           = AV_RL16(&buf[0]);
+    num_blocks_raw    = AV_RL16(&buf[2]);
+    num_blocks_packed = AV_RL16(&buf[4]);
+    vector_bits       = AV_RL16(&buf[6]);
+    buf += 12;
+
+    if (vector_bits > MIN_CACHE_BITS || !vector_bits) {
+        av_log(s->avctx, AV_LOG_ERROR,
+               "Invalid value for motion vector bits: %d\n", vector_bits);
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* allocate codebook buffers as necessary */
+    if (num_mvs > s->num_mvs) {
+        s->mv_codebook = av_realloc(s->mv_codebook, num_mvs*2*sizeof(int));
+        s->num_mvs = num_mvs;
+    }
+
+    if (num_blocks_packed > s->num_blocks_packed) {
+        s->block_codebook = av_realloc(s->block_codebook, num_blocks_packed*16);
+        s->num_blocks_packed = num_blocks_packed;
+    }
+
+    /* read motion vectors */
+    mvbits = (num_mvs * 2 * 10 + 31) & ~31;
+
+    if (buf_end - buf < (mvbits>>3) + 16*num_blocks_raw + 8*num_blocks_packed)
+        return AVERROR_INVALIDDATA;
+
+    init_get_bits(&gb, buf, mvbits);
+    for (i = 0; i < num_mvs; i++) {
+        s->mv_codebook[i][0] = get_sbits(&gb, 10);
+        s->mv_codebook[i][1] = get_sbits(&gb, 10);
+    }
+    buf += mvbits >> 3;
+
+    /* note ptr to uncompressed blocks */
+    blocks_raw = buf;
+    buf       += num_blocks_raw * 16;
+
+    /* read compressed blocks */
+    init_get_bits(&gb, buf, (buf_end - buf) << 3);
+    for (i = 0; i < num_blocks_packed; i++) {
+        int tmp[4];
+        for (j = 0; j < 4; j++)
+            tmp[j] = get_bits(&gb, 8);
+        for (j = 0; j < 16; j++)
+            s->block_codebook[i][15-j] = tmp[get_bits(&gb, 2)];
+    }
+
+    if (get_bits_left(&gb) < vector_bits *
+        (s->avctx->height / 4) * (s->avctx->width / 4))
+        return AVERROR_INVALIDDATA;
+
+    /* read vectors and build frame */
+    for (y = 0; y < s->avctx->height / 4; y++)
+        for (x = 0; x < s->avctx->width / 4; x++) {
+            unsigned int vector = get_bits(&gb, vector_bits);
+            const uint8_t *src;
+            int src_stride;
+
+            if (vector < num_mvs) {
+                int mx = x * 4 + s->mv_codebook[vector][0];
+                int my = y * 4 + s->mv_codebook[vector][1];
+
+                if (mx < 0 || mx + 4 > s->avctx->width ||
+                    my < 0 || my + 4 > s->avctx->height) {
+                    av_log(s->avctx, AV_LOG_ERROR, "MV %d %d out of picture\n", mx, my);
+                    continue;
+                }
+
+                src = s->last_frame.data[0] + mx + my * s->last_frame.linesize[0];
+                src_stride = s->last_frame.linesize[0];
+            } else {
+                int offset = vector - num_mvs;
+                if (offset < num_blocks_raw)
+                    src = blocks_raw + 16*offset;
+                else if (offset - num_blocks_raw < num_blocks_packed)
+                    src = s->block_codebook[offset - num_blocks_raw];
+                else
+                    continue;
+                src_stride = 4;
+            }
+
+            for (j = 0; j < 4; j++)
+                for (i = 0; i < 4; i++)
+                    frame->data[0][(y * 4 + j) * frame->linesize[0] + (x * 4 + i)] =
+                        src[j * src_stride + i];
+    }
+
+    return 0;
+}
+
+static int tgv_decode_frame(AVCodecContext *avctx,
+                            void *data, int *got_frame,
+                            AVPacket *avpkt)
+{
+    const uint8_t *buf     = avpkt->data;
+    int buf_size           = avpkt->size;
+    TgvContext *s          = avctx->priv_data;
+    const uint8_t *buf_end = buf + buf_size;
+    AVFrame *frame         = data;
+    int chunk_type, ret;
+
+    if (buf_end - buf < EA_PREAMBLE_SIZE)
+        return AVERROR_INVALIDDATA;
+
+    chunk_type = AV_RL32(&buf[0]);
+    buf       += EA_PREAMBLE_SIZE;
+
+    if (chunk_type == kVGT_TAG) {
+        int pal_count, i;
+        if(buf_end - buf < 12) {
+            av_log(avctx, AV_LOG_WARNING, "truncated header\n");
+            return AVERROR_INVALIDDATA;
+        }
+
+        s->width  = AV_RL16(&buf[0]);
+        s->height = AV_RL16(&buf[2]);
+        if (s->avctx->width != s->width || s->avctx->height != s->height) {
+            avcodec_set_dimensions(s->avctx, s->width, s->height);
+            av_freep(&s->frame_buffer);
+            av_frame_unref(&s->last_frame);
+        }
+
+        pal_count = AV_RL16(&buf[6]);
+        buf += 12;
+        for(i = 0; i < pal_count && i < AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
+            s->palette[i] = 0xFFU << 24 | AV_RB24(buf);
+            buf += 3;
+        }
+    }
+
+    if ((ret = av_image_check_size(s->width, s->height, 0, avctx)) < 0)
+        return ret;
+
+    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
+        return ret;
+
+    memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
+
+    if (chunk_type == kVGT_TAG) {
+        int y;
+        frame->key_frame = 1;
+        frame->pict_type = AV_PICTURE_TYPE_I;
+
+        if (!s->frame_buffer &&
+            !(s->frame_buffer = av_malloc(s->width * s->height)))
+            return AVERROR(ENOMEM);
+
+        if (unpack(buf, buf_end, s->frame_buffer, s->avctx->width, s->avctx->height) < 0) {
+            av_log(avctx, AV_LOG_WARNING, "truncated intra frame\n");
+            return AVERROR_INVALIDDATA;
+        }
+        for (y = 0; y < s->height; y++)
+            memcpy(frame->data[0]  + y * frame->linesize[0],
+                   s->frame_buffer + y * s->width,
+                   s->width);
+    } else {
+        if (!s->last_frame.data[0]) {
+            av_log(avctx, AV_LOG_WARNING, "inter frame without corresponding intra frame\n");
+            return buf_size;
+        }
+        frame->key_frame = 0;
+        frame->pict_type = AV_PICTURE_TYPE_P;
+        if (tgv_decode_inter(s, frame, buf, buf_end) < 0) {
+            av_log(avctx, AV_LOG_WARNING, "truncated inter frame\n");
+            return AVERROR_INVALIDDATA;
+        }
+    }
+
+    av_frame_unref(&s->last_frame);
+    if ((ret = av_frame_ref(&s->last_frame, frame)) < 0)
+        return ret;
+
+    *got_frame = 1;
+
+    return buf_size;
+}
+
+static av_cold int tgv_decode_end(AVCodecContext *avctx)
+{
+    TgvContext *s = avctx->priv_data;
+    av_frame_unref(&s->last_frame);
+    av_freep(&s->frame_buffer);
+    av_free(s->mv_codebook);
+    av_free(s->block_codebook);
+    return 0;
+}
+
+AVCodec ff_eatgv_decoder = {
+    .name           = "eatgv",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_TGV,
+    .priv_data_size = sizeof(TgvContext),
+    .init           = tgv_decode_init,
+    .close          = tgv_decode_end,
+    .decode         = tgv_decode_frame,
+    .long_name      = NULL_IF_CONFIG_SMALL("Electronic Arts TGV video"),
+    .capabilities   = CODEC_CAP_DR1,
+};