yep, FLI support

Originally committed as revision 2519 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 228 insertions, 0 deletions

diff --git a/libavformat/flic.c b/libavformat/flic.c
new file mode 100644
index 0000000000..cab689a8ef
--- /dev/null
+++ b/libavformat/flic.c
@@ -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;
+}