yep, FLI support
authorMike Melanson <mike@multimedia.cx>
Fri, 14 Nov 2003 05:42:14 +0000 (05:42 +0000)
committerMike Melanson <mike@multimedia.cx>
Fri, 14 Nov 2003 05:42:14 +0000 (05:42 +0000)
Originally committed as revision 2519 to svn://svn.ffmpeg.org/ffmpeg/trunk

Changelog
doc/ffmpeg-doc.texi
libavcodec/Makefile
libavcodec/allcodecs.c
libavcodec/avcodec.h
libavcodec/flicvideo.c [new file with mode: 0644]
libavformat/Makefile
libavformat/allformats.c
libavformat/avformat.h
libavformat/flic.c [new file with mode: 0644]

index 112d537..f639e42 100644 (file)
--- a/Changelog
+++ b/Changelog
@@ -2,11 +2,14 @@ version <next>:
 - DV encoder, DV muxer
 - Microsoft RLE video decoder
 - Microsoft Video-1 decoder
+- Apple Graphics (SMC) decoder
 - Apple Video (RPZA) decoder
 - Cinepak decoder
 - Sega FILM (CPK) file demuxer
-- Westwood multimedia support (VQA/AUD file demuxer, audio decoder)
+- Westwood multimedia support (VQA & AUD files)
 - Id Quake II CIN playback support
+- 8BPS video decoder
+- FLIC playback support
 
 version 0.4.8:
 
index 2532709..ee19541 100644 (file)
@@ -613,6 +613,7 @@ library:
 @item Raw MJPEG @tab X  @tab  X 
 @item Raw MPEG video @tab X  @tab  X 
 @item Raw PCM8/16 bits, mulaw/Alaw@tab X  @tab  X 
+@item Raw CRI ADX audio @tab X  @tab  X 
 @item SUN AU format @tab X  @tab  X 
 @item NUT @tab X @tab X @tab NUT Open Container Format
 @item Quicktime        @tab X @tab  X 
@@ -635,6 +636,8 @@ library:
 @tab Multimedia formats used in Westwood Studios games
 @item Id Cinematic (.cin) @tab    @tab X
 @tab Used in Quake II
+@item FLIC format      @tab    @tab X
+@tab .fli/.flc files
 @end multitable
 
 @code{X} means that the encoding (resp. decoding) is supported.
@@ -695,6 +698,7 @@ following image formats are supported:
 @item Id RoQ                 @tab     @tab  X @tab used in Quake III, Jedi Knight 2, other computer games
 @item Xan/WC3                @tab     @tab  X @tab used in Wing Commander III .MVE files
 @item Interplay Video        @tab     @tab  X @tab used in Interplay .MVE files
+@item Apple Graphics         @tab     @tab  X @tab fourcc: 'smc '
 @item Apple Video            @tab     @tab  X @tab fourcc: rpza
 @item Cinepak                @tab     @tab  X
 @item Microsoft RLE          @tab     @tab  X
@@ -702,6 +706,7 @@ following image formats are supported:
 @item Westwood VQA           @tab     @tab  X
 @item Id Cinematic Video     @tab     @tab  X @tab used in Quake II
 @item Planar RGB             @tab     @tab  X @tab fourcc: 8BPS
+@item FLIC video             @tab     @tab  X
 @end multitable
 
 @code{X} means that the encoding (resp. decoding) is supported.
@@ -731,7 +736,10 @@ solutions.
 @item Duck DK4 IMA ADPCM     @tab      @tab X
 @tab used in some Sega Saturn console games
 @item Westwood Studios IMA ADPCM @tab      @tab X
-@tab used in Westwood Studios games likes Command and Conquer
+@tab used in Westwood Studios games like Command and Conquer
+@item CD-ROM XA ADPCM        @tab      @tab X
+@item CRI ADX ADPCM          @tab X    @tab X
+@tab used in Sega Dreamcast games
 @item RA144                  @tab      @tab X
 @tab Real 14400 bit/s codec
 @item RA288                  @tab      @tab X
index 6271aa3..d5accc2 100644 (file)
@@ -19,7 +19,7 @@ OBJS= common.o utils.o mem.o allcodecs.o \
       vp3.o asv1.o 4xm.o cabac.o ffv1.o ra144.o ra288.o vcr1.o cljr.o \
       roqvideo.o dpcm.o interplayvideo.o xan.o rpza.o cinepak.o msrle.o \
       msvideo1.o vqavideo.o idcinvideo.o adx.o rational.o faandct.o 8bps.o \
-      smc.o parser.o
+      smc.o parser.o flicvideo.o
 
 ifeq ($(AMR_NB),yes)
 ifeq ($(AMR_NB_FIXED),yes)
index f57ff0b..b7af5be 100644 (file)
@@ -137,6 +137,7 @@ void avcodec_register_all(void)
     register_avcodec(&idcin_decoder);
     register_avcodec(&eightbps_decoder);
     register_avcodec(&smc_decoder);
+    register_avcodec(&flic_decoder);
 #ifdef CONFIG_AC3
     register_avcodec(&ac3_decoder);
 #endif
index 64d0ce1..0e5d1cd 100644 (file)
@@ -86,6 +86,7 @@ enum CodecID {
     CODEC_ID_IDCIN,
     CODEC_ID_8BPS,
     CODEC_ID_SMC,
+    CODEC_ID_FLIC,
 
     /* various pcm "codecs" */
     CODEC_ID_PCM_S16LE,
@@ -1574,6 +1575,7 @@ extern AVCodec vqa_decoder;
 extern AVCodec idcin_decoder;
 extern AVCodec eightbps_decoder;
 extern AVCodec smc_decoder;
+extern AVCodec flic_decoder;
 extern AVCodec ra_144_decoder;
 extern AVCodec ra_288_decoder;
 extern AVCodec roq_dpcm_decoder;
diff --git a/libavcodec/flicvideo.c b/libavcodec/flicvideo.c
new file mode 100644 (file)
index 0000000..b5cd366
--- /dev/null
@@ -0,0 +1,461 @@
+/*
+ * FLI/FLC Animation Video Decoder
+ * Copyright (C) 2003 the ffmpeg project
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+/**
+ * @file flic.c
+ * Autodesk Animator FLI/FLC Video Decoder
+ * by Mike Melanson (melanson@pcisys.net)
+ * for more information on the .fli/.flc file format and all of its many
+ * variations, visit:
+ *   http://www.compuphase.com/flic.htm
+ *
+ * This decoder outputs PAL8 colorspace data. To use this decoder, be
+ * sure that your demuxer sends the FLI file header to the decoder via
+ * the extradata chunk in AVCodecContext. The chunk should be 128 bytes
+ * large. The only exception is for FLI files from the game "Magic Carpet",
+ * in which the header is only 12 bytes.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "avcodec.h"
+#include "bswap.h"
+
+#define FLI_256_COLOR 4
+#define FLI_DELTA     7
+#define FLI_COLOR     11
+#define FLI_LC        12
+#define FLI_BLACK     13
+#define FLI_BRUN      15
+#define FLI_COPY      16
+#define FLI_MINI      18
+
+#define LE_16(x)  ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
+#define LE_32(x)  ((((uint8_t*)(x))[3] << 24) | \
+                   (((uint8_t*)(x))[2] << 16) | \
+                   (((uint8_t*)(x))[1] << 8) | \
+                    ((uint8_t*)(x))[0])
+
+typedef struct FlicDecodeContext {
+    AVCodecContext *avctx;
+    AVFrame frame;
+    AVFrame prev_frame;
+
+    unsigned int palette[256];
+    int new_palette;
+    int fli_type;  /* either 0xAF11 or 0xAF12, affects palette resolution */
+} FlicDecodeContext;
+
+static int flic_decode_init(AVCodecContext *avctx)
+{
+    FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
+    unsigned char *fli_header = (unsigned char *)avctx->extradata;
+
+    s->avctx = avctx;
+    avctx->pix_fmt = PIX_FMT_PAL8;
+    avctx->has_b_frames = 0;
+
+    if (s->avctx->extradata_size == 12) {
+        /* special case for magic carpet FLIs */
+        s->fli_type = 0xAF13;
+    } else if (s->avctx->extradata_size == 128) {
+        s->fli_type = LE_16(&fli_header[4]);
+    } else {
+        printf (" FLI video: expected extradata of 12 or 128 bytes\n");
+        return -1;
+    }
+
+    s->frame.data[0] = s->prev_frame.data[0] = NULL;
+    s->new_palette = 0;
+
+    return 0;
+}
+
+static int flic_decode_frame(AVCodecContext *avctx,
+                             void *data, int *data_size,
+                             uint8_t *buf, int buf_size)
+{
+    FlicDecodeContext *s = (FlicDecodeContext *)avctx->priv_data;
+
+    int stream_ptr = 0;
+    int stream_ptr_after_color_chunk;
+    int pixel_ptr;
+    int palette_ptr;
+    unsigned char palette_idx1;
+    unsigned char palette_idx2;
+
+    unsigned int frame_size;
+    int num_chunks;
+
+    unsigned int chunk_size;
+    int chunk_type;
+
+    int i, j;
+
+    int color_packets;
+    int color_changes;
+    int color_shift;
+    unsigned char r, g, b;
+
+    int lines;
+    int compressed_lines;
+    int starting_line;
+    signed short line_packets;
+    int y_ptr;
+    signed char byte_run;
+    int pixel_skip;
+    int pixel_countdown;
+    int height_countdown;
+    unsigned char *pixels;
+    unsigned char *prev_pixels;
+
+    s->frame.reference = 1;
+    if (avctx->get_buffer(avctx, &s->frame) < 0) {
+        fprintf(stderr, "  FLI: get_buffer() failed\n");
+        return -1;
+    }
+
+    pixels = s->frame.data[0];
+    prev_pixels = s->prev_frame.data[0];
+
+    frame_size = LE_32(&buf[stream_ptr]);
+    stream_ptr += 6;  /* skip the magic number */
+    num_chunks = LE_16(&buf[stream_ptr]);
+    stream_ptr += 10;  /* skip padding */
+
+    frame_size -= 16;
+
+    /* if there is no data, copy previous frame */
+    if (frame_size == 0) {
+        memcpy(pixels, prev_pixels, s->frame.linesize[0] * s->avctx->height);
+    }
+
+    /* iterate through the chunks */
+    while ((frame_size > 0) && (num_chunks > 0)) {
+        chunk_size = LE_32(&buf[stream_ptr]);
+        stream_ptr += 4;
+        chunk_type = LE_16(&buf[stream_ptr]);
+        stream_ptr += 2;
+
+        switch (chunk_type) {
+        case FLI_256_COLOR:
+        case FLI_COLOR:
+            stream_ptr_after_color_chunk = stream_ptr + chunk_size - 6;
+            s->new_palette = 1;
+
+            /* check special case: If this file is from the Magic Carpet 
+             * game and uses 6-bit colors even though it reports 256-color 
+             * chunks in a 0xAF12-type file (fli_type is set to 0xAF13 during
+             * initialization) */
+            if ((chunk_type == FLI_256_COLOR) && (s->fli_type != 0xAF13))
+                color_shift = 0;
+            else
+                color_shift = 2;
+            /* set up the palette */
+            color_packets = LE_16(&buf[stream_ptr]);
+            stream_ptr += 2;
+            palette_ptr = 0;
+            for (i = 0; i < color_packets; i++) {
+                /* first byte is how many colors to skip */
+                palette_ptr += buf[stream_ptr++];
+
+                /* next byte indicates how many entries to change */
+                color_changes = buf[stream_ptr++];
+
+                /* if there are 0 color changes, there are actually 256 */
+                if (color_changes == 0)
+                    color_changes = 256;
+
+                for (j = 0; j < color_changes; j++) {
+
+                    /* wrap around, for good measure */
+                    if (palette_ptr >= 256)
+                        palette_ptr = 0;
+
+                    r = buf[stream_ptr++] << color_shift;
+                    g = buf[stream_ptr++] << color_shift;
+                    b = buf[stream_ptr++] << color_shift;
+                    s->palette[palette_ptr++] = (r << 16) | (g << 8) | b;
+                }
+            }
+
+            /* color chunks sometimes have weird 16-bit alignment issues;
+             * therefore, take the hardline approach and set the stream_ptr
+             * to the value calculated w.r.t. the size specified by the color
+             * chunk header */
+            stream_ptr = stream_ptr_after_color_chunk;
+
+            break;
+
+        case FLI_DELTA:
+            y_ptr = 0;
+            height_countdown = s->avctx->height;
+            compressed_lines = LE_16(&buf[stream_ptr]);
+            stream_ptr += 2;
+            while (compressed_lines > 0) {
+                line_packets = LE_16(&buf[stream_ptr]);
+                stream_ptr += 2;
+                if (line_packets < 0) {
+                    line_packets = -line_packets;
+                    /* height_countdown was already decremented once on
+                     * this iteration */
+                    height_countdown -= line_packets;
+                    /* copy the skipped lines from the previous frame */
+                    while (line_packets--) {
+                        memcpy(&pixels[y_ptr], &prev_pixels[y_ptr], 
+                            s->avctx->width);
+                        y_ptr += s->frame.linesize[0];
+                    }
+                } else {
+                    height_countdown--;
+                    compressed_lines--;
+                    pixel_ptr = y_ptr;
+                    pixel_countdown = s->avctx->width;
+                    for (i = 0; i < line_packets; i++) {
+                        /* account for the skip bytes */
+                        pixel_skip = buf[stream_ptr++];
+                        memcpy(&pixels[pixel_ptr], &prev_pixels[pixel_ptr],
+                            pixel_skip);
+                        pixel_ptr += pixel_skip;
+                        pixel_countdown -= pixel_skip;
+                        byte_run = buf[stream_ptr++];
+                        if (byte_run < 0) {
+                            byte_run = -byte_run;
+                            palette_idx1 = buf[stream_ptr++];
+                            palette_idx2 = buf[stream_ptr++];
+                            for (j = 0; j < byte_run; j++, pixel_countdown -= 2) {
+                                pixels[pixel_ptr++] = palette_idx1;
+                                pixels[pixel_ptr++] = palette_idx2;
+                            }
+                        } else {
+                            for (j = 0; j < byte_run * 2; j++, pixel_countdown--) {
+                                palette_idx1 = buf[stream_ptr++];
+                                pixels[pixel_ptr++] = palette_idx1;
+                            }
+                        }
+                    }
+
+                    /* copy the remaining pixels in the line from the
+                     * previous frame */
+                    memcpy(&pixels[pixel_ptr], &prev_pixels[pixel_ptr],
+                        pixel_countdown);
+
+                    y_ptr += s->frame.linesize[0];
+                }
+            }
+
+            /* copy the remainder of the lines from the previous frame */
+            while (height_countdown--) {
+                memcpy(&pixels[y_ptr], &prev_pixels[y_ptr], s->avctx->width);
+                y_ptr += s->frame.linesize[0];
+            }
+            break;
+
+        case FLI_LC:
+            /* line compressed */
+            height_countdown = s->avctx->height;
+            starting_line = LE_16(&buf[stream_ptr]);
+            stream_ptr += 2;
+
+            /* copy from the previous frame all of the lines prior to the
+             * starting line */
+            y_ptr = 0;
+            height_countdown -= starting_line;
+            while (starting_line--) {
+                memcpy(&pixels[y_ptr], &prev_pixels[y_ptr], s->avctx->width);
+                y_ptr += s->frame.linesize[0];
+            }
+
+            compressed_lines = LE_16(&buf[stream_ptr]);
+            stream_ptr += 2;
+            while (compressed_lines > 0) {
+                pixel_ptr = y_ptr;
+                pixel_countdown = s->avctx->width;
+                line_packets = buf[stream_ptr++];
+                if (line_packets > 0) {
+                    for (i = 0; i < line_packets; i++) {
+                        /* account for the skip bytes */
+                        pixel_skip = buf[stream_ptr++];
+                        memcpy(&pixels[pixel_ptr],
+                            &prev_pixels[pixel_ptr], pixel_skip);
+                        pixel_ptr += pixel_skip;
+                        pixel_countdown -= pixel_skip;
+                        byte_run = buf[stream_ptr++];
+                        if (byte_run > 0) {
+                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
+                                palette_idx1 = buf[stream_ptr++];
+                                pixels[pixel_ptr++] = palette_idx1;
+                            }
+                        } else {
+                            byte_run = -byte_run;
+                            palette_idx1 = buf[stream_ptr++];
+                            for (j = 0; j < byte_run; j++, pixel_countdown--) {
+                                pixels[pixel_ptr++] = palette_idx1;
+                            }
+                        }
+                    }
+                }
+
+                /* copy the remainder of the line from the previous frame */
+                memcpy(&pixels[pixel_ptr], &prev_pixels[pixel_ptr],
+                    pixel_countdown);
+
+                y_ptr += s->frame.linesize[0];
+                compressed_lines--;
+                height_countdown--;
+            }
+
+            /* copy the remainder of the lines from the previous frame */
+            while (height_countdown--) {
+                memcpy(&pixels[y_ptr], &prev_pixels[y_ptr], s->avctx->width);
+                y_ptr += s->frame.linesize[0];
+            }
+            break;
+
+        case FLI_BLACK:
+            /* set the whole frame to color 0 (which is usually black) */
+            memset(pixels, 0,
+                s->frame.linesize[0] * s->avctx->height);
+            break;
+
+        case FLI_BRUN:
+            /* Byte run compression: This chunk type only occurs in the first
+             * FLI frame and it will update the entire frame. */
+            y_ptr = 0;
+            for (lines = 0; lines < s->avctx->height; lines++) {
+                pixel_ptr = y_ptr;
+                /* disregard the line packets; instead, iterate through all
+                 * pixels on a row */
+                stream_ptr++;
+                pixel_countdown = s->avctx->width;
+                while (pixel_countdown > 0) {
+                    byte_run = buf[stream_ptr++];
+                    if (byte_run > 0) {
+                        palette_idx1 = buf[stream_ptr++];
+                        for (j = 0; j < byte_run; j++) {
+                            pixels[pixel_ptr++] = palette_idx1;
+                            pixel_countdown--;
+                            if (pixel_countdown < 0)
+                                printf ("fli warning: pixel_countdown < 0 (%d)\n",
+                                    pixel_countdown);
+                        }
+                    } else {  /* copy bytes if byte_run < 0 */
+                        byte_run = -byte_run;
+                        for (j = 0; j < byte_run; j++) {
+                            palette_idx1 = buf[stream_ptr++];
+                            pixels[pixel_ptr++] = palette_idx1;
+                            pixel_countdown--;
+                            if (pixel_countdown < 0)
+                                printf ("fli warning: pixel_countdown < 0 (%d)\n",
+                                    pixel_countdown);
+                        }
+                    }
+                }
+
+                y_ptr += s->frame.linesize[0];
+            }
+            break;
+
+        case FLI_COPY:
+            /* copy the chunk (uncompressed frame) to the ghost image and
+             * schedule the whole frame to be updated */
+            if (chunk_size - 6 > s->avctx->width * s->avctx->height) {
+                printf(
+                "FLI: in chunk FLI_COPY : source data (%d bytes) bigger than" \
+                " image, skipping chunk\n",
+                chunk_size - 6);
+                stream_ptr += chunk_size - 6;
+            } else {
+                for (y_ptr = 0; y_ptr < s->frame.linesize[0] * s->avctx->height;
+                     y_ptr += s->frame.linesize[0]) {
+                    memcpy(&pixels[y_ptr], &buf[stream_ptr],
+                        s->avctx->width);
+                    stream_ptr += s->avctx->width;
+                }
+            }
+            break;
+
+        case FLI_MINI:
+            /* some sort of a thumbnail? disregard this chunk... */
+            stream_ptr += chunk_size - 6;
+            break;
+
+        default:
+            printf ("FLI: Unrecognized chunk type: %d\n", chunk_type);
+            break;
+        }
+
+        frame_size -= chunk_size;
+        num_chunks--;
+    }
+
+    /* by the end of the chunk, the stream ptr should equal the frame
+     * size (minus 1, possibly); if it doesn't, issue a warning */
+    if ((stream_ptr != buf_size) && (stream_ptr != buf_size - 1))
+        printf ("  warning: processed FLI chunk where chunk size = %d\n" \
+                "    and final chunk ptr = %d\n",
+            buf_size, stream_ptr);
+
+    /* make the palette available on the way out */
+//    if (s->new_palette) {
+    if (1) {
+        memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
+        s->frame.palette_has_changed = 1;
+        s->new_palette = 0;
+    }
+
+    if (s->prev_frame.data[0])
+        avctx->release_buffer(avctx, &s->prev_frame);
+
+    /* shuffle frames */
+    s->prev_frame = s->frame;
+
+    *data_size=sizeof(AVFrame);
+    *(AVFrame*)data = s->frame;
+
+    return buf_size;
+}
+
+static int flic_decode_end(AVCodecContext *avctx)
+{
+    FlicDecodeContext *s = avctx->priv_data;
+
+    if (s->prev_frame.data[0])
+        avctx->release_buffer(avctx, &s->prev_frame);
+
+    return 0;
+}
+
+AVCodec flic_decoder = {
+    "flic",
+    CODEC_TYPE_VIDEO,
+    CODEC_ID_FLIC,
+    sizeof(FlicDecodeContext),
+    flic_decode_init,
+    NULL,
+    flic_decode_end,
+    flic_decode_frame,
+    CODEC_CAP_DR1,
+    NULL
+};
index bfda476..0984c72 100644 (file)
@@ -15,7 +15,7 @@ PPOBJS=
 OBJS+=mpeg.o mpegts.o mpegtsenc.o ffm.o crc.o img.o raw.o rm.o \
       avienc.o avidec.o wav.o swf.o au.o gif.o mov.o mpjpeg.o dv.o \
       yuv4mpeg.o 4xm.o flvenc.o flvdec.o movenc.o psxstr.o idroq.o ipmovie.o \
-      nut.o wc3movie.o mp3.o westwood.o segafilm.o idcin.o
+      nut.o wc3movie.o mp3.o westwood.o segafilm.o idcin.o flic.o
 
 ifeq ($(CONFIG_RISKY),yes)
 OBJS+= asf.o
index cc213f9..9446c0c 100644 (file)
@@ -69,6 +69,7 @@ void av_register_all(void)
     westwood_init();
     film_init();
     idcin_init();
+    flic_init();
 
 #if defined(AMR_NB) || defined(AMR_NB_FIXED) || defined(AMR_WB)
     amr_init();
index 8aaedeb..cf81c88 100644 (file)
@@ -479,6 +479,9 @@ int film_init(void);
 /* idcin.c */
 int idcin_init(void);
 
+/* flic.c */
+int flic_init(void);
+
 #include "rtp.h"
 
 #include "rtsp.h"
diff --git a/libavformat/flic.c b/libavformat/flic.c
new file mode 100644 (file)
index 0000000..cab689a
--- /dev/null
@@ -0,0 +1,228 @@
+/*
+ * FLI/FLC Animation File Demuxer
+ * Copyright (c) 2003 The ffmpeg Project
+ *
+ * This library 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 of the License, or (at your option) any later version.
+ *
+ * This library 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 this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+/**
+ * @file flic.c
+ * FLI/FLC file demuxer
+ * by Mike Melanson (melanson@pcisys.net)
+ * for more information on the .fli/.flc file format and all of its many
+ * variations, visit:
+ *   http://www.compuphase.com/flic.htm
+ *
+ * This demuxer handles standard 0xAF11- and 0xAF12-type FLIs. It also
+ * handles special FLIs from the PC game "Magic Carpet".
+ */
+
+#include "avformat.h"
+
+#define LE_16(x)  ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
+#define LE_32(x)  ((((uint8_t*)(x))[3] << 24) | \
+                   (((uint8_t*)(x))[2] << 16) | \
+                   (((uint8_t*)(x))[1] << 8) | \
+                    ((uint8_t*)(x))[0])
+
+#define FLIC_FILE_MAGIC_1 0xAF11
+#define FLIC_FILE_MAGIC_2 0xAF12
+#define FLIC_CHUNK_MAGIC_1 0xF1FA
+#define FLIC_CHUNK_MAGIC_2 0xF5FA
+#define FLIC_MC_PTS_INC 6000  /* pts increment for Magic Carpet game FLIs */
+#define FLIC_DEFAULT_PTS_INC 6000  /* for FLIs that have 0 speed */
+
+#define FLIC_HEADER_SIZE 128
+#define FLIC_PREAMBLE_SIZE 6
+
+typedef struct FlicDemuxContext {
+    int frame_pts_inc;
+    int64_t pts;
+    int video_stream_index;
+} FlicDemuxContext;
+
+static int flic_probe(AVProbeData *p)
+{
+    int magic_number;
+
+    if (p->buf_size < 6)
+        return 0;
+
+    magic_number = LE_16(&p->buf[4]);
+    if ((magic_number != FLIC_FILE_MAGIC_1) &&
+        (magic_number != FLIC_FILE_MAGIC_2))
+        return 0;
+
+    return AVPROBE_SCORE_MAX;
+}
+
+static int flic_read_header(AVFormatContext *s,
+                            AVFormatParameters *ap)
+{
+    FlicDemuxContext *flic = (FlicDemuxContext *)s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    unsigned char header[FLIC_HEADER_SIZE];
+    AVStream *st;
+    int speed;
+    int magic_number;
+
+    flic->pts = 0;
+
+    /* load the whole header and pull out the width and height */
+    if (get_buffer(pb, header, FLIC_HEADER_SIZE) != FLIC_HEADER_SIZE)
+        return -EIO;
+
+    magic_number = LE_16(&header[4]);
+    speed = LE_32(&header[0x10]);
+
+    /* initialize the decoder streams */
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+    flic->video_stream_index = st->index;
+    st->codec.codec_type = CODEC_TYPE_VIDEO;
+    st->codec.codec_id = CODEC_ID_FLIC;
+    st->codec.codec_tag = 0;  /* no fourcc */
+    st->codec.width = LE_16(&header[0x08]);
+    st->codec.height = LE_16(&header[0x0A]);
+
+    if (!st->codec.width || !st->codec.height)
+        return AVERROR_INVALIDDATA;
+
+    /* send over the whole 128-byte FLIC header */
+    st->codec.extradata_size = FLIC_HEADER_SIZE;
+    st->codec.extradata = av_malloc(FLIC_HEADER_SIZE);
+    memcpy(st->codec.extradata, header, FLIC_HEADER_SIZE);
+
+    /* set the pts reference (1 pts = 1/90000) */
+    s->pts_num = 1;
+    s->pts_den = 90000;
+
+    /* Time to figure out the framerate: If there is a FLIC chunk magic
+     * number at offset 0x10, assume this is from the Bullfrog game,
+     * Magic Carpet. */
+    if (LE_16(&header[0x10]) == FLIC_CHUNK_MAGIC_1) {
+
+        flic->frame_pts_inc = FLIC_MC_PTS_INC;
+
+        /* rewind the stream since the first chunk is at offset 12 */
+        url_fseek(pb, 12, SEEK_SET);
+
+        /* send over abbreviated FLIC header chunk */
+        av_free(st->codec.extradata);
+        st->codec.extradata_size = 12;
+        st->codec.extradata = av_malloc(12);
+        memcpy(st->codec.extradata, header, 12);
+
+    } else if (magic_number == FLIC_FILE_MAGIC_1) {
+        /*
+         * in this case, the speed (n) is number of 1/70s ticks between frames:
+         *
+         *    pts        n * frame #
+         *  --------  =  -----------  => pts = n * (90000/70) * frame #
+         *   90000           70
+         *
+         *  therefore, the frame pts increment = n * 1285.7
+         */
+        flic->frame_pts_inc = speed * 1285.7;
+    } else if (magic_number == FLIC_FILE_MAGIC_2) {
+        /*
+         * in this case, the speed (n) is number of milliseconds between frames:
+         *
+         *    pts        n * frame #
+         *  --------  =  -----------  => pts = n * 90 * frame #
+         *   90000          1000
+         *
+         *  therefore, the frame pts increment = n * 90
+         */
+        flic->frame_pts_inc = speed * 90;
+    } else
+        return AVERROR_INVALIDDATA;
+
+    if (flic->frame_pts_inc == 0)
+        flic->frame_pts_inc = FLIC_DEFAULT_PTS_INC;
+
+    return 0;
+}
+
+static int flic_read_packet(AVFormatContext *s,
+                            AVPacket *pkt)
+{
+    FlicDemuxContext *flic = (FlicDemuxContext *)s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    int packet_read = 0;
+    unsigned int size;
+    int magic;
+    int ret = 0;
+    unsigned char preamble[FLIC_PREAMBLE_SIZE];
+
+    while (!packet_read) {
+
+        if ((ret = get_buffer(pb, preamble, FLIC_PREAMBLE_SIZE)) !=
+            FLIC_PREAMBLE_SIZE) {
+            ret = -EIO;
+            break;
+        }
+
+        size = LE_32(&preamble[0]);
+        magic = LE_16(&preamble[4]);
+
+        if ((magic == FLIC_CHUNK_MAGIC_1) || (magic == FLIC_CHUNK_MAGIC_2)) {
+            if (av_new_packet(pkt, size)) {
+                ret = -EIO;
+                break;
+            }
+            pkt->stream_index = flic->video_stream_index;
+            pkt->pts = flic->pts;
+            memcpy(pkt->data, preamble, FLIC_PREAMBLE_SIZE);
+            ret = get_buffer(pb, pkt->data + FLIC_PREAMBLE_SIZE, 
+                size - FLIC_PREAMBLE_SIZE);
+            if (ret != size - FLIC_PREAMBLE_SIZE) {
+                av_free_packet(pkt);
+                ret = -EIO;
+            }
+            flic->pts += flic->frame_pts_inc;
+            packet_read = 1;
+        } else {
+            /* not interested in this chunk */
+            url_fseek(pb, size - 6, SEEK_CUR);
+        }
+    }
+
+    return ret;
+}
+
+static int flic_read_close(AVFormatContext *s)
+{
+//    FlicDemuxContext *flic = (FlicDemuxContext *)s->priv_data;
+
+    return 0;
+}
+
+static AVInputFormat flic_iformat = {
+    "flic",
+    "FLI/FLC animation format",
+    sizeof(FlicDemuxContext),
+    flic_probe,
+    flic_read_header,
+    flic_read_packet,
+    flic_read_close,
+};
+
+int flic_init(void)
+{
+    av_register_input_format(&flic_iformat);
+    return 0;
+}