Start working on a branch where FFmpeg is not copied, patched and carved to be built with automake but instead imported inline and built using its own build system. This is an import of a slightly modified FFmpeg current tree. xine-lib builds, install and run fine with it, but there are of course plenty of things that needs to be fixed before it can even be considered for a 1.2.x series. Work will continue in the next days of course.

CVS patchset: 8397
CVS date: 2006/12/02 01:19:48

1 files changed, 492 insertions, 0 deletions

diff --git a/contrib/ffmpeg/libavcodec/xan.c b/contrib/ffmpeg/libavcodec/xan.c
new file mode 100644
index 000000000..56ce87a95
--- /dev/null
+++ b/contrib/ffmpeg/libavcodec/xan.c
@@ -0,0 +1,492 @@
+/*
+ * Wing Commander/Xan Video Decoder
+ * Copyright (C) 2003 the ffmpeg project
+ *
+ * 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 xan.c
+ * Xan video decoder for Wing Commander III computer game
+ * by Mario Brito (mbrito@student.dei.uc.pt)
+ * and Mike Melanson (melanson@pcisys.net)
+ *
+ * The xan_wc3 decoder outputs PAL8 data.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "avcodec.h"
+
+typedef struct XanContext {
+
+    AVCodecContext *avctx;
+    AVFrame last_frame;
+    AVFrame current_frame;
+
+    unsigned char *buf;
+    int size;
+
+    /* scratch space */
+    unsigned char *buffer1;
+    int buffer1_size;
+    unsigned char *buffer2;
+    int buffer2_size;
+
+    int frame_size;
+
+} XanContext;
+
+static int xan_decode_init(AVCodecContext *avctx)
+{
+    XanContext *s = avctx->priv_data;
+
+    s->avctx = avctx;
+    s->frame_size = 0;
+
+    if ((avctx->codec->id == CODEC_ID_XAN_WC3) &&
+        (s->avctx->palctrl == NULL)) {
+        av_log(avctx, AV_LOG_ERROR, " WC3 Xan video: palette expected.\n");
+        return -1;
+    }
+
+    avctx->pix_fmt = PIX_FMT_PAL8;
+    avctx->has_b_frames = 0;
+
+    if(avcodec_check_dimensions(avctx, avctx->width, avctx->height))
+        return -1;
+
+    s->buffer1_size = avctx->width * avctx->height;
+    s->buffer1 = av_malloc(s->buffer1_size);
+    s->buffer2_size = avctx->width * avctx->height;
+    s->buffer2 = av_malloc(s->buffer2_size);
+    if (!s->buffer1 || !s->buffer2)
+        return -1;
+
+    return 0;
+}
+
+/* This function is used in lieu of memcpy(). This decoder can not use
+ * memcpy because the memory locations often overlap and
+ * memcpy doesn't like that; it's not uncommon, for example, for
+ * dest = src+1, to turn byte A into  pattern AAAAAAAA.
+ * This was originally repz movsb in Intel x86 ASM. */
+static inline void bytecopy(unsigned char *dest, unsigned char *src, int count)
+{
+    int i;
+
+    for (i = 0; i < count; i++)
+        dest[i] = src[i];
+}
+
+static int xan_huffman_decode(unsigned char *dest, unsigned char *src,
+    int dest_len)
+{
+    unsigned char byte = *src++;
+    unsigned char ival = byte + 0x16;
+    unsigned char * ptr = src + byte*2;
+    unsigned char val = ival;
+    int counter = 0;
+    unsigned char *dest_end = dest + dest_len;
+
+    unsigned char bits = *ptr++;
+
+    while ( val != 0x16 ) {
+        if ( (1 << counter) & bits )
+            val = src[byte + val - 0x17];
+        else
+            val = src[val - 0x17];
+
+        if ( val < 0x16 ) {
+            if (dest + 1 > dest_end)
+                return 0;
+            *dest++ = val;
+            val = ival;
+        }
+
+        if (counter++ == 7) {
+            counter = 0;
+            bits = *ptr++;
+        }
+    }
+
+    return 0;
+}
+
+static void xan_unpack(unsigned char *dest, unsigned char *src, int dest_len)
+{
+    unsigned char opcode;
+    int size;
+    int offset;
+    int byte1, byte2, byte3;
+    unsigned char *dest_end = dest + dest_len;
+
+    for (;;) {
+        opcode = *src++;
+
+        if ( (opcode & 0x80) == 0 ) {
+
+            offset = *src++;
+
+            size = opcode & 3;
+            if (dest + size > dest_end)
+                return;
+            bytecopy(dest, src, size);  dest += size;  src += size;
+
+            size = ((opcode & 0x1c) >> 2) + 3;
+            if (dest + size > dest_end)
+                return;
+            bytecopy (dest, dest - (((opcode & 0x60) << 3) + offset + 1), size);
+            dest += size;
+
+        } else if ( (opcode & 0x40) == 0 ) {
+
+            byte1 = *src++;
+            byte2 = *src++;
+
+            size = byte1 >> 6;
+            if (dest + size > dest_end)
+                return;
+            bytecopy (dest, src, size);  dest += size;  src += size;
+
+            size = (opcode & 0x3f) + 4;
+            if (dest + size > dest_end)
+                return;
+            bytecopy (dest, dest - (((byte1 & 0x3f) << 8) + byte2 + 1), size);
+            dest += size;
+
+        } else if ( (opcode & 0x20) == 0 ) {
+
+            byte1 = *src++;
+            byte2 = *src++;
+            byte3 = *src++;
+
+            size = opcode & 3;
+            if (dest + size > dest_end)
+                return;
+            bytecopy (dest, src, size);  dest += size;  src += size;
+
+            size = byte3 + 5 + ((opcode & 0xc) << 6);
+            if (dest + size > dest_end)
+                return;
+            bytecopy (dest,
+                dest - ((((opcode & 0x10) >> 4) << 0x10) + 1 + (byte1 << 8) + byte2),
+                size);
+            dest += size;
+        } else {
+            size = ((opcode & 0x1f) << 2) + 4;
+
+            if (size > 0x70)
+                break;
+
+            if (dest + size > dest_end)
+                return;
+            bytecopy (dest, src, size);  dest += size;  src += size;
+        }
+    }
+
+    size = opcode & 3;
+    bytecopy(dest, src, size);  dest += size;  src += size;
+}
+
+static void inline xan_wc3_output_pixel_run(XanContext *s,
+    unsigned char *pixel_buffer, int x, int y, int pixel_count)
+{
+    int stride;
+    int line_inc;
+    int index;
+    int current_x;
+    int width = s->avctx->width;
+    unsigned char *palette_plane;
+
+    palette_plane = s->current_frame.data[0];
+    stride = s->current_frame.linesize[0];
+    line_inc = stride - width;
+    index = y * stride + x;
+    current_x = x;
+    while((pixel_count--) && (index < s->frame_size)) {
+
+        /* don't do a memcpy() here; keyframes generally copy an entire
+         * frame of data and the stride needs to be accounted for */
+        palette_plane[index++] = *pixel_buffer++;
+
+        current_x++;
+        if (current_x >= width) {
+            index += line_inc;
+            current_x = 0;
+        }
+    }
+}
+
+static void inline xan_wc3_copy_pixel_run(XanContext *s,
+    int x, int y, int pixel_count, int motion_x, int motion_y)
+{
+    int stride;
+    int line_inc;
+    int curframe_index, prevframe_index;
+    int curframe_x, prevframe_x;
+    int width = s->avctx->width;
+    unsigned char *palette_plane, *prev_palette_plane;
+
+    palette_plane = s->current_frame.data[0];
+    prev_palette_plane = s->last_frame.data[0];
+    stride = s->current_frame.linesize[0];
+    line_inc = stride - width;
+    curframe_index = y * stride + x;
+    curframe_x = x;
+    prevframe_index = (y + motion_y) * stride + x + motion_x;
+    prevframe_x = x + motion_x;
+    while((pixel_count--) && (curframe_index < s->frame_size)) {
+
+        palette_plane[curframe_index++] =
+            prev_palette_plane[prevframe_index++];
+
+        curframe_x++;
+        if (curframe_x >= width) {
+            curframe_index += line_inc;
+            curframe_x = 0;
+        }
+
+        prevframe_x++;
+        if (prevframe_x >= width) {
+            prevframe_index += line_inc;
+            prevframe_x = 0;
+        }
+    }
+}
+
+static void xan_wc3_decode_frame(XanContext *s) {
+
+    int width = s->avctx->width;
+    int height = s->avctx->height;
+    int total_pixels = width * height;
+    unsigned char opcode;
+    unsigned char flag = 0;
+    int size = 0;
+    int motion_x, motion_y;
+    int x, y;
+
+    unsigned char *opcode_buffer = s->buffer1;
+    int opcode_buffer_size = s->buffer1_size;
+    unsigned char *imagedata_buffer = s->buffer2;
+    int imagedata_buffer_size = s->buffer2_size;
+
+    /* pointers to segments inside the compressed chunk */
+    unsigned char *huffman_segment;
+    unsigned char *size_segment;
+    unsigned char *vector_segment;
+    unsigned char *imagedata_segment;
+
+    huffman_segment =   s->buf + LE_16(&s->buf[0]);
+    size_segment =      s->buf + LE_16(&s->buf[2]);
+    vector_segment =    s->buf + LE_16(&s->buf[4]);
+    imagedata_segment = s->buf + LE_16(&s->buf[6]);
+
+    xan_huffman_decode(opcode_buffer, huffman_segment, opcode_buffer_size);
+
+    if (imagedata_segment[0] == 2)
+        xan_unpack(imagedata_buffer, &imagedata_segment[1],
+            imagedata_buffer_size);
+    else
+        imagedata_buffer = &imagedata_segment[1];
+
+    /* use the decoded data segments to build the frame */
+    x = y = 0;
+    while (total_pixels) {
+
+        opcode = *opcode_buffer++;
+        size = 0;
+
+        switch (opcode) {
+
+        case 0:
+            flag ^= 1;
+            continue;
+
+        case 1:
+        case 2:
+        case 3:
+        case 4:
+        case 5:
+        case 6:
+        case 7:
+        case 8:
+            size = opcode;
+            break;
+
+        case 12:
+        case 13:
+        case 14:
+        case 15:
+        case 16:
+        case 17:
+        case 18:
+            size += (opcode - 10);
+            break;
+
+        case 9:
+        case 19:
+            size = *size_segment++;
+            break;
+
+        case 10:
+        case 20:
+            size = BE_16(&size_segment[0]);
+            size_segment += 2;
+            break;
+
+        case 11:
+        case 21:
+            size = (size_segment[0] << 16) | (size_segment[1] << 8) |
+                size_segment[2];
+            size_segment += 3;
+            break;
+        }
+
+        if (opcode < 12) {
+            flag ^= 1;
+            if (flag) {
+                /* run of (size) pixels is unchanged from last frame */
+                xan_wc3_copy_pixel_run(s, x, y, size, 0, 0);
+            } else {
+                /* output a run of pixels from imagedata_buffer */
+                xan_wc3_output_pixel_run(s, imagedata_buffer, x, y, size);
+                imagedata_buffer += size;
+            }
+        } else {
+            /* run-based motion compensation from last frame */
+            motion_x = (*vector_segment >> 4) & 0xF;
+            motion_y = *vector_segment & 0xF;
+            vector_segment++;
+
+            /* sign extension */
+            if (motion_x & 0x8)
+                motion_x |= 0xFFFFFFF0;
+            if (motion_y & 0x8)
+                motion_y |= 0xFFFFFFF0;
+
+            /* copy a run of pixels from the previous frame */
+            xan_wc3_copy_pixel_run(s, x, y, size, motion_x, motion_y);
+
+            flag = 0;
+        }
+
+        /* coordinate accounting */
+        total_pixels -= size;
+        while (size) {
+            if (x + size >= width) {
+                y++;
+                size -= (width - x);
+                x = 0;
+            } else {
+                x += size;
+                size = 0;
+            }
+        }
+    }
+}
+
+static void xan_wc4_decode_frame(XanContext *s) {
+}
+
+static int xan_decode_frame(AVCodecContext *avctx,
+                            void *data, int *data_size,
+                            uint8_t *buf, int buf_size)
+{
+    XanContext *s = avctx->priv_data;
+    AVPaletteControl *palette_control = avctx->palctrl;
+
+    if (avctx->get_buffer(avctx, &s->current_frame)) {
+        av_log(s->avctx, AV_LOG_ERROR, "  Xan Video: get_buffer() failed\n");
+        return -1;
+    }
+    s->current_frame.reference = 3;
+
+    if (!s->frame_size)
+        s->frame_size = s->current_frame.linesize[0] * s->avctx->height;
+
+    palette_control->palette_changed = 0;
+    memcpy(s->current_frame.data[1], palette_control->palette,
+        AVPALETTE_SIZE);
+    s->current_frame.palette_has_changed = 1;
+
+    s->buf = buf;
+    s->size = buf_size;
+
+    if (avctx->codec->id == CODEC_ID_XAN_WC3)
+        xan_wc3_decode_frame(s);
+    else if (avctx->codec->id == CODEC_ID_XAN_WC4)
+        xan_wc4_decode_frame(s);
+
+    /* release the last frame if it is allocated */
+    if (s->last_frame.data[0])
+        avctx->release_buffer(avctx, &s->last_frame);
+
+    /* shuffle frames */
+    s->last_frame = s->current_frame;
+
+    *data_size = sizeof(AVFrame);
+    *(AVFrame*)data = s->current_frame;
+
+    /* always report that the buffer was completely consumed */
+    return buf_size;
+}
+
+static int xan_decode_end(AVCodecContext *avctx)
+{
+    XanContext *s = avctx->priv_data;
+
+    /* release the last frame */
+    if (s->last_frame.data[0])
+        avctx->release_buffer(avctx, &s->last_frame);
+
+    av_free(s->buffer1);
+    av_free(s->buffer2);
+
+    return 0;
+}
+
+AVCodec xan_wc3_decoder = {
+    "xan_wc3",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_XAN_WC3,
+    sizeof(XanContext),
+    xan_decode_init,
+    NULL,
+    xan_decode_end,
+    xan_decode_frame,
+    CODEC_CAP_DR1,
+};
+
+/*
+AVCodec xan_wc4_decoder = {
+    "xan_wc4",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_XAN_WC4,
+    sizeof(XanContext),
+    xan_decode_init,
+    NULL,
+    xan_decode_end,
+    xan_decode_frame,
+    CODEC_CAP_DR1,
+};
+*/