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, 339 insertions, 0 deletions

diff --git a/contrib/ffmpeg/libavcodec/gifdec.c b/contrib/ffmpeg/libavcodec/gifdec.c
new file mode 100644
index 000000000..5a5712299
--- /dev/null
+++ b/contrib/ffmpeg/libavcodec/gifdec.c
@@ -0,0 +1,339 @@
+/*
+ * GIF decoder
+ * Copyright (c) 2003 Fabrice Bellard.
+ * Copyright (c) 2006 Baptiste Coudurier.
+ *
+ * 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
+ */
+
+//#define DEBUG
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "lzw.h"
+
+#define GCE_DISPOSAL_NONE       0
+#define GCE_DISPOSAL_INPLACE    1
+#define GCE_DISPOSAL_BACKGROUND 2
+#define GCE_DISPOSAL_RESTORE    3
+
+typedef struct GifState {
+    AVFrame picture;
+    int screen_width;
+    int screen_height;
+    int bits_per_pixel;
+    int background_color_index;
+    int transparent_color_index;
+    int color_resolution;
+    uint32_t *image_palette;
+
+    /* after the frame is displayed, the disposal method is used */
+    int gce_disposal;
+    /* delay during which the frame is shown */
+    int gce_delay;
+
+    /* LZW compatible decoder */
+    uint8_t *bytestream;
+    LZWState *lzw;
+
+    /* aux buffers */
+    uint8_t global_palette[256 * 3];
+    uint8_t local_palette[256 * 3];
+} GifState;
+
+static const uint8_t gif87a_sig[6] = "GIF87a";
+static const uint8_t gif89a_sig[6] = "GIF89a";
+
+static int gif_read_image(GifState *s)
+{
+    int left, top, width, height, bits_per_pixel, code_size, flags;
+    int is_interleaved, has_local_palette, y, pass, y1, linesize, n, i;
+    uint8_t *ptr, *spal, *palette, *ptr1;
+
+    left = bytestream_get_le16(&s->bytestream);
+    top = bytestream_get_le16(&s->bytestream);
+    width = bytestream_get_le16(&s->bytestream);
+    height = bytestream_get_le16(&s->bytestream);
+    flags = bytestream_get_byte(&s->bytestream);
+    is_interleaved = flags & 0x40;
+    has_local_palette = flags & 0x80;
+    bits_per_pixel = (flags & 0x07) + 1;
+#ifdef DEBUG
+    dprintf("gif: image x=%d y=%d w=%d h=%d\n", left, top, width, height);
+#endif
+
+    if (has_local_palette) {
+        bytestream_get_buffer(&s->bytestream, s->local_palette, 3 * (1 << bits_per_pixel));
+        palette = s->local_palette;
+    } else {
+        palette = s->global_palette;
+        bits_per_pixel = s->bits_per_pixel;
+    }
+
+    /* verify that all the image is inside the screen dimensions */
+    if (left + width > s->screen_width ||
+        top + height > s->screen_height)
+        return -EINVAL;
+
+    /* build the palette */
+    n = (1 << bits_per_pixel);
+    spal = palette;
+    for(i = 0; i < n; i++) {
+        s->image_palette[i] = (0xff << 24) |
+            (spal[0] << 16) | (spal[1] << 8) | (spal[2]);
+        spal += 3;
+    }
+    for(; i < 256; i++)
+        s->image_palette[i] = (0xff << 24);
+    /* handle transparency */
+    if (s->transparent_color_index >= 0)
+        s->image_palette[s->transparent_color_index] = 0;
+
+    /* now get the image data */
+    code_size = bytestream_get_byte(&s->bytestream);
+    //TODO: add proper data size
+    ff_lzw_decode_init(s->lzw, code_size, s->bytestream, 0, FF_LZW_GIF);
+
+    /* read all the image */
+    linesize = s->picture.linesize[0];
+    ptr1 = s->picture.data[0] + top * linesize + left;
+    ptr = ptr1;
+    pass = 0;
+    y1 = 0;
+    for (y = 0; y < height; y++) {
+        ff_lzw_decode(s->lzw, ptr, width);
+        if (is_interleaved) {
+            switch(pass) {
+            default:
+            case 0:
+            case 1:
+                y1 += 8;
+                ptr += linesize * 8;
+                if (y1 >= height) {
+                    y1 = 4;
+                    if (pass == 0)
+                        ptr = ptr1 + linesize * 4;
+                    else
+                        ptr = ptr1 + linesize * 2;
+                    pass++;
+                }
+                break;
+            case 2:
+                y1 += 4;
+                ptr += linesize * 4;
+                if (y1 >= height) {
+                    y1 = 1;
+                    ptr = ptr1 + linesize;
+                    pass++;
+                }
+                break;
+            case 3:
+                y1 += 2;
+                ptr += linesize * 2;
+                break;
+            }
+        } else {
+            ptr += linesize;
+        }
+    }
+    /* read the garbage data until end marker is found */
+    ff_lzw_decode_tail(s->lzw);
+    s->bytestream = ff_lzw_cur_ptr(s->lzw);
+    return 0;
+}
+
+static int gif_read_extension(GifState *s)
+{
+    int ext_code, ext_len, i, gce_flags, gce_transparent_index;
+
+    /* extension */
+    ext_code = bytestream_get_byte(&s->bytestream);
+    ext_len = bytestream_get_byte(&s->bytestream);
+#ifdef DEBUG
+    dprintf("gif: ext_code=0x%x len=%d\n", ext_code, ext_len);
+#endif
+    switch(ext_code) {
+    case 0xf9:
+        if (ext_len != 4)
+            goto discard_ext;
+        s->transparent_color_index = -1;
+        gce_flags = bytestream_get_byte(&s->bytestream);
+        s->gce_delay = bytestream_get_le16(&s->bytestream);
+        gce_transparent_index = bytestream_get_byte(&s->bytestream);
+        if (gce_flags & 0x01)
+            s->transparent_color_index = gce_transparent_index;
+        else
+            s->transparent_color_index = -1;
+        s->gce_disposal = (gce_flags >> 2) & 0x7;
+#ifdef DEBUG
+        dprintf("gif: gce_flags=%x delay=%d tcolor=%d disposal=%d\n",
+               gce_flags, s->gce_delay,
+               s->transparent_color_index, s->gce_disposal);
+#endif
+        ext_len = bytestream_get_byte(&s->bytestream);
+        break;
+    }
+
+    /* NOTE: many extension blocks can come after */
+ discard_ext:
+    while (ext_len != 0) {
+        for (i = 0; i < ext_len; i++)
+            bytestream_get_byte(&s->bytestream);
+        ext_len = bytestream_get_byte(&s->bytestream);
+#ifdef DEBUG
+        dprintf("gif: ext_len1=%d\n", ext_len);
+#endif
+    }
+    return 0;
+}
+
+static int gif_read_header1(GifState *s)
+{
+    uint8_t sig[6];
+    int v, n;
+    int has_global_palette;
+
+    /* read gif signature */
+    bytestream_get_buffer(&s->bytestream, sig, 6);
+    if (memcmp(sig, gif87a_sig, 6) != 0 &&
+        memcmp(sig, gif89a_sig, 6) != 0)
+        return -1;
+
+    /* read screen header */
+    s->transparent_color_index = -1;
+    s->screen_width = bytestream_get_le16(&s->bytestream);
+    s->screen_height = bytestream_get_le16(&s->bytestream);
+    if(   (unsigned)s->screen_width  > 32767
+       || (unsigned)s->screen_height > 32767){
+        av_log(NULL, AV_LOG_ERROR, "picture size too large\n");
+        return -1;
+    }
+
+    v = bytestream_get_byte(&s->bytestream);
+    s->color_resolution = ((v & 0x70) >> 4) + 1;
+    has_global_palette = (v & 0x80);
+    s->bits_per_pixel = (v & 0x07) + 1;
+    s->background_color_index = bytestream_get_byte(&s->bytestream);
+    bytestream_get_byte(&s->bytestream);                /* ignored */
+#ifdef DEBUG
+    dprintf("gif: screen_w=%d screen_h=%d bpp=%d global_palette=%d\n",
+           s->screen_width, s->screen_height, s->bits_per_pixel,
+           has_global_palette);
+#endif
+    if (has_global_palette) {
+        n = 1 << s->bits_per_pixel;
+        bytestream_get_buffer(&s->bytestream, s->global_palette, n * 3);
+    }
+    return 0;
+}
+
+static int gif_parse_next_image(GifState *s)
+{
+    int ret, code;
+
+    for (;;) {
+        code = bytestream_get_byte(&s->bytestream);
+#ifdef DEBUG
+        dprintf("gif: code=%02x '%c'\n", code, code);
+#endif
+        switch (code) {
+        case ',':
+            if (gif_read_image(s) < 0)
+                return -1;
+            ret = 0;
+            goto the_end;
+        case ';':
+            /* end of image */
+            ret = -1;
+            goto the_end;
+        case '!':
+            if (gif_read_extension(s) < 0)
+                return -1;
+            break;
+        case EOF:
+        default:
+            /* error or errneous EOF */
+            ret = -1;
+            goto the_end;
+        }
+    }
+  the_end:
+    return ret;
+}
+
+static int gif_decode_init(AVCodecContext *avctx)
+{
+    GifState *s = avctx->priv_data;
+
+    avcodec_get_frame_defaults(&s->picture);
+    avctx->coded_frame= &s->picture;
+    s->picture.data[0] = NULL;
+    ff_lzw_decode_open(&s->lzw);
+    return 0;
+}
+
+static int gif_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
+{
+    GifState *s = avctx->priv_data;
+    AVFrame *picture = data;
+    int ret;
+
+    s->bytestream = buf;
+    if (gif_read_header1(s) < 0)
+        return -1;
+
+    avctx->pix_fmt = PIX_FMT_PAL8;
+    if (avcodec_check_dimensions(avctx, s->screen_width, s->screen_height))
+        return -1;
+    avcodec_set_dimensions(avctx, s->screen_width, s->screen_height);
+
+    if (s->picture.data[0])
+        avctx->release_buffer(avctx, &s->picture);
+    if (avctx->get_buffer(avctx, &s->picture) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return -1;
+    }
+    s->image_palette = (uint32_t *)s->picture.data[1];
+    ret = gif_parse_next_image(s);
+    if (ret < 0)
+        return ret;
+
+    *picture = s->picture;
+    *data_size = sizeof(AVPicture);
+    return 0;
+}
+
+static int gif_decode_close(AVCodecContext *avctx)
+{
+    GifState *s = avctx->priv_data;
+
+    ff_lzw_decode_close(&s->lzw);
+    if(s->picture.data[0])
+        avctx->release_buffer(avctx, &s->picture);
+    return 0;
+}
+
+AVCodec gif_decoder = {
+    "gif",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_GIF,
+    sizeof(GifState),
+    gif_decode_init,
+    NULL,
+    gif_decode_close,
+    gif_decode_frame,
+};