initial commit for Id RoQ and Interplay MVE multimedia subsystems

Originally committed as revision 2195 to svn://svn.ffmpeg.org/ffmpeg/trunk

5 files changed, 926 insertions, 1 deletions

diff --git a/libavformat/Makefile b/libavformat/Makefile
index 15f7d07b6e..256edeccc7 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -14,7 +14,7 @@ PPOBJS=
 # mux and demuxes
 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 dvcore.o dv.o \
-      yuv4mpeg.o 4xm.o flvenc.o flvdec.o movenc.o psxstr.o
+      yuv4mpeg.o 4xm.o flvenc.o flvdec.o movenc.o psxstr.o idroq.o ipmovie.o
 
 ifeq ($(CONFIG_RISKY),yes)
 OBJS+= asf.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index 0fde3a2642..7496032647 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -52,6 +52,8 @@ void av_register_all(void)
     flvenc_init();
     flvdec_init();
     str_init();
+    roq_init();
+    ipmovie_init();
 
 #ifdef AMR_NB
     amr_init();
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 30cc1a5ff8..6ade72fee1 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -383,6 +383,12 @@ int fourxm_init(void);
 /* psxstr.c */
 int str_init(void);
 
+/* idroq.c */
+int roq_init(void);
+
+/* ipmovie.c */
+int ipmovie_init(void);
+
 #include "rtp.h"
 
 #include "rtsp.h"
diff --git a/libavformat/idroq.c b/libavformat/idroq.c
new file mode 100644
index 0000000000..15c6d55131
--- /dev/null
+++ b/libavformat/idroq.c
@@ -0,0 +1,299 @@
+/*
+ * Id RoQ (.roq) 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 idroq.c
+ * Id RoQ format file demuxer
+ * by Mike Melanson (melanson@pcisys.net)
+ * for more information on the .roq file format, visit:
+ *   http://www.csse.monash.edu.au/~timf/
+ */
+
+#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 RoQ_MAGIC_NUMBER 0x1084
+#define RoQ_CHUNK_PREAMBLE_SIZE 8
+#define RoQ_AUDIO_SAMPLE_RATE 22050
+#define RoQ_CHUNKS_TO_SCAN 30
+
+#define RoQ_INFO           0x1001
+#define RoQ_QUAD_CODEBOOK  0x1002
+#define RoQ_QUAD_VQ        0x1011
+#define RoQ_SOUND_MONO     0x1020
+#define RoQ_SOUND_STEREO   0x1021
+
+typedef struct RoqDemuxContext {
+
+    int width;
+    int height;
+    int audio_channels;
+    int framerate;
+    int frame_pts_inc;
+
+    int video_stream_index;
+    int audio_stream_index;
+
+    int64_t video_pts;
+    unsigned int audio_frame_count;
+
+} RoqDemuxContext;
+
+static int roq_probe(AVProbeData *p)
+{
+    if ((LE_16(&p->buf[0]) != RoQ_MAGIC_NUMBER) ||
+        (LE_32(&p->buf[2]) != 0xFFFFFFFF))
+        return 0;
+
+    return AVPROBE_SCORE_MAX;
+}
+
+static int roq_read_header(AVFormatContext *s,
+                           AVFormatParameters *ap)
+{
+    RoqDemuxContext *roq = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    AVStream *st;
+    unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
+    int i;
+    unsigned int chunk_size;
+    unsigned int chunk_type;
+
+    /* get the main header */
+    if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != 
+        RoQ_CHUNK_PREAMBLE_SIZE)
+        return AVERROR_IO;
+    roq->framerate = LE_16(&preamble[6]);
+    roq->frame_pts_inc = 90000 / roq->framerate;
+
+    /* set the pts reference (1 pts = 1/90000) */
+    s->pts_num = 1;
+    s->pts_den = 90000;
+
+    /* init private context parameters */
+    roq->width = roq->height = roq->audio_channels = roq->video_pts = 
+    roq->audio_frame_count = 0;
+
+    /* scan the first n chunks searching for A/V parameters */
+    for (i = 0; i < RoQ_CHUNKS_TO_SCAN; i++) {
+        if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != 
+            RoQ_CHUNK_PREAMBLE_SIZE)
+            return AVERROR_IO;
+
+        chunk_type = LE_16(&preamble[0]);
+        chunk_size = LE_32(&preamble[2]);
+
+        switch (chunk_type) {
+
+        case RoQ_INFO:
+            /* fetch the width and height; reuse the preamble bytes */
+            if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != 
+                RoQ_CHUNK_PREAMBLE_SIZE)
+                return AVERROR_IO;
+            roq->width = LE_16(&preamble[0]);
+            roq->height = LE_16(&preamble[2]);
+            break;
+
+        case RoQ_QUAD_CODEBOOK:
+        case RoQ_QUAD_VQ:
+            /* ignore during this scan */
+            url_fseek(pb, chunk_size, SEEK_CUR);
+            break;
+
+        case RoQ_SOUND_MONO:
+            roq->audio_channels = 1;
+            url_fseek(pb, chunk_size, SEEK_CUR);
+            break;
+
+        case RoQ_SOUND_STEREO:
+            roq->audio_channels = 2;
+            url_fseek(pb, chunk_size, SEEK_CUR);
+            break;
+
+        default:
+            printf (" unknown RoQ chunk type (%04X)\n", LE_16(&preamble[0]));
+            return AVERROR_INVALIDDATA;
+            break;
+        }
+
+        /* if all necessary parameters have been gathered, exit early */
+        if ((roq->width && roq->height) && roq->audio_channels)
+            break;
+    }
+
+    /* seek back to the first chunk */
+    url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_SET);
+
+    /* initialize the decoders */
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+    roq->video_stream_index = st->index;
+    st->codec.codec_type = CODEC_TYPE_VIDEO;
+    st->codec.codec_id = CODEC_ID_ROQ;
+    st->codec.codec_tag = 0;  /* no fourcc */
+    st->codec.width = roq->width;
+    st->codec.height = roq->height;
+
+    if (roq->audio_channels) {
+        st = av_new_stream(s, 0);
+        if (!st)
+            return AVERROR_NOMEM;
+        roq->audio_stream_index = st->index;
+        st->codec.codec_type = CODEC_TYPE_AUDIO;
+        st->codec.codec_id = CODEC_ID_ROQ_DPCM;
+        st->codec.codec_tag = 0;  /* no tag */
+        st->codec.channels = roq->audio_channels;
+        st->codec.sample_rate = RoQ_AUDIO_SAMPLE_RATE;
+        st->codec.bits_per_sample = 16;
+        st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
+            st->codec.bits_per_sample;
+        st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
+    }
+printf (" video is %d x %d, audio is %d channels\n",
+  roq->width, roq->height, roq->audio_channels);
+
+    return 0;
+}
+
+static int roq_read_packet(AVFormatContext *s,
+                           AVPacket *pkt)
+{
+    RoqDemuxContext *roq = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    int ret = 0;
+    unsigned int chunk_size;
+    unsigned int chunk_type;
+    unsigned int codebook_size;
+    unsigned char preamble[RoQ_CHUNK_PREAMBLE_SIZE];
+    int packet_read = 0;
+    offset_t codebook_offset;
+
+    while (!packet_read) {
+
+        if (url_feof(&s->pb))
+            return -EIO;
+
+        /* get the next chunk preamble */
+        if ((ret = get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE)) != 
+            RoQ_CHUNK_PREAMBLE_SIZE)
+            return -EIO;
+
+        chunk_type = LE_16(&preamble[0]);
+        chunk_size = LE_32(&preamble[2]);
+
+        switch (chunk_type) {
+
+        case RoQ_INFO:
+            /* don't care about this chunk anymore */
+            url_fseek(pb, RoQ_CHUNK_PREAMBLE_SIZE, SEEK_CUR);
+            break;
+
+        case RoQ_QUAD_CODEBOOK:
+            /* packet needs to contain both this codebook and next VQ chunk */
+            codebook_offset = url_ftell(pb) - RoQ_CHUNK_PREAMBLE_SIZE;
+            codebook_size = chunk_size;
+            url_fseek(pb, codebook_size, SEEK_CUR);
+            if (get_buffer(pb, preamble, RoQ_CHUNK_PREAMBLE_SIZE) != 
+                RoQ_CHUNK_PREAMBLE_SIZE)
+                return -EIO;
+            chunk_size = LE_32(&preamble[2]) + RoQ_CHUNK_PREAMBLE_SIZE * 2 + 
+                codebook_size;
+
+            /* rewind */
+            url_fseek(pb, codebook_offset, SEEK_SET);
+
+            /* load up the packet */
+            if (av_new_packet(pkt, chunk_size))
+                return -EIO;
+            pkt->stream_index = roq->video_stream_index;
+            pkt->pts = roq->video_pts;
+            ret = get_buffer(pb, pkt->data, chunk_size);
+            if (ret != chunk_size)
+                ret = -EIO;
+
+            roq->video_pts += roq->frame_pts_inc;
+            packet_read = 1;
+            break;
+
+        case RoQ_SOUND_MONO:
+        case RoQ_SOUND_STEREO:
+        case RoQ_QUAD_VQ:
+            /* load up the packet */
+            if (av_new_packet(pkt, chunk_size + RoQ_CHUNK_PREAMBLE_SIZE))
+                return -EIO;
+            /* copy over preamble */
+            memcpy(pkt->data, preamble, RoQ_CHUNK_PREAMBLE_SIZE);
+
+            if (chunk_type == RoQ_QUAD_VQ) {
+                pkt->stream_index = roq->video_stream_index;
+                pkt->pts = roq->video_pts;
+                roq->video_pts += roq->frame_pts_inc;
+            } else {
+                pkt->stream_index = roq->audio_stream_index;
+                pkt->pts = roq->audio_frame_count;
+                pkt->pts *= 90000;
+                pkt->pts /= RoQ_AUDIO_SAMPLE_RATE;
+                roq->audio_frame_count += (chunk_size / roq->audio_channels);
+            }
+
+            ret = get_buffer(pb, pkt->data, chunk_size);
+            if (ret != chunk_size)
+                ret = -EIO;
+
+            packet_read = 1;
+            break;
+
+        default:
+            printf ("  unknown RoQ chunk (%04X)\n", chunk_type);
+            return AVERROR_INVALIDDATA;
+            break;
+        }
+    }
+
+    return ret;
+}
+
+static int roq_read_close(AVFormatContext *s)
+{
+//    RoqDemuxContext *roq = (RoqDemuxContext *)s->priv_data;
+
+    return 0;
+}
+
+static AVInputFormat roq_iformat = {
+    "RoQ",
+    "Id RoQ format",
+    sizeof(RoqDemuxContext),
+    roq_probe,
+    roq_read_header,
+    roq_read_packet,
+    roq_read_close,
+};
+
+int roq_init(void)
+{
+    av_register_input_format(&roq_iformat);
+    return 0;
+}
diff --git a/libavformat/ipmovie.c b/libavformat/ipmovie.c
new file mode 100644
index 0000000000..ce37dedf06
--- /dev/null
+++ b/libavformat/ipmovie.c
@@ -0,0 +1,618 @@
+/*
+ * Interplay MVE 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 ipmovie.c
+ * Interplay MVE file demuxer
+ * by Mike Melanson (melanson@pcisys.net)
+ * For more information regarding the Interplay MVE file format, visit:
+ *   http://www.pcisys.net/~melanson/codecs/
+ * The aforementioned site also contains a command line utility for parsing
+ * IP MVE files so that you can get a good idea of the typical structure of
+ * such files. This demuxer is not the best example to use if you are trying
+ * to write your own as it uses a rather roundabout approach for splitting
+ * up and sending out the chunks.
+ */
+
+#include "avformat.h"
+
+/* debugging support: #define DEBUG_IPMOVIE as non-zero to see extremely
+ * verbose information about the demux process */
+#define DEBUG_IPMOVIE 0
+
+#if DEBUG_IPMOVIE
+#define debug_ipmovie printf
+#else
+static inline void debug_ipmovie(const char *format, ...) { }
+#endif
+
+
+#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 IPMOVIE_SIGNATURE "Interplay MVE File\x1A\0"
+#define IPMOVIE_SIGNATURE_SIZE 20
+#define CHUNK_PREAMBLE_SIZE 4
+#define OPCODE_PREAMBLE_SIZE 4
+
+#define CHUNK_INIT_AUDIO   0x0000
+#define CHUNK_AUDIO_ONLY   0x0001
+#define CHUNK_INIT_VIDEO   0x0002
+#define CHUNK_VIDEO        0x0003
+#define CHUNK_SHUTDOWN     0x0004
+#define CHUNK_END          0x0005
+/* these last types are used internally */
+#define CHUNK_DONE         0xFFFC
+#define CHUNK_NOMEM        0xFFFD
+#define CHUNK_EOF          0xFFFE
+#define CHUNK_BAD          0xFFFF
+
+#define OPCODE_END_OF_STREAM           0x00
+#define OPCODE_END_OF_CHUNK            0x01
+#define OPCODE_CREATE_TIMER            0x02
+#define OPCODE_INIT_AUDIO_BUFFERS      0x03
+#define OPCODE_START_STOP_AUDIO        0x04
+#define OPCODE_INIT_VIDEO_BUFFERS      0x05
+#define OPCODE_UNKNOWN_06              0x06
+#define OPCODE_SEND_BUFFER             0x07
+#define OPCODE_AUDIO_FRAME             0x08
+#define OPCODE_SILENCE_FRAME           0x09
+#define OPCODE_INIT_VIDEO_MODE         0x0A
+#define OPCODE_CREATE_GRADIENT         0x0B
+#define OPCODE_SET_PALETTE             0x0C
+#define OPCODE_SET_PALETTE_COMPRESSED  0x0D
+#define OPCODE_UNKNOWN_0E              0x0E
+#define OPCODE_SET_DECODING_MAP        0x0F
+#define OPCODE_UNKNOWN_10              0x10
+#define OPCODE_VIDEO_DATA              0x11
+#define OPCODE_UNKNOWN_12              0x12
+#define OPCODE_UNKNOWN_13              0x13
+#define OPCODE_UNKNOWN_14              0x14
+#define OPCODE_UNKNOWN_15              0x15
+
+#define PALETTE_COUNT 256
+
+typedef struct IPMVEContext {
+
+    unsigned char *buf;
+    int buf_size;
+
+    int fps;
+    int frame_pts_inc;
+
+    unsigned int video_width;
+    unsigned int video_height;
+    int64_t video_pts;
+
+    unsigned int audio_bits;
+    unsigned int audio_channels;
+    unsigned int audio_sample_rate;
+    unsigned int audio_type;
+    unsigned int audio_frame_count;
+
+    int video_stream_index;
+    int audio_stream_index;
+
+    offset_t audio_chunk_offset;
+    int audio_chunk_size;
+    offset_t video_chunk_offset;
+    int video_chunk_size;
+    offset_t decode_map_chunk_offset;
+    int decode_map_chunk_size;
+
+    offset_t next_chunk_offset;
+
+} IPMVEContext;
+
+static int load_ipmovie_packet(IPMVEContext *s, ByteIOContext *pb, 
+    AVPacket *pkt) {
+
+    int chunk_type;
+    int64_t audio_pts = 0;
+
+    if (s->audio_chunk_offset) {
+
+        url_fseek(pb, s->audio_chunk_offset, SEEK_SET);
+        s->audio_chunk_offset = 0;
+
+        /* figure out the audio pts */
+        audio_pts = 90000;
+        audio_pts *= s->audio_frame_count;
+        audio_pts /= s->audio_sample_rate;
+
+        if (av_new_packet(pkt, s->audio_chunk_size))
+            return CHUNK_NOMEM;
+
+        pkt->stream_index = s->audio_stream_index;
+        pkt->pts = audio_pts;
+        if (get_buffer(pb, pkt->data, s->audio_chunk_size) != 
+            s->audio_chunk_size) {
+            av_free_packet(pkt);
+            return CHUNK_EOF;
+        }
+
+        /* audio frame maintenance */
+        if (s->audio_type != CODEC_ID_INTERPLAY_DPCM)
+            s->audio_frame_count +=
+            (s->audio_chunk_size / s->audio_channels / (s->audio_bits / 8));
+        else
+            s->audio_frame_count +=
+                (s->audio_chunk_size - 6) / s->audio_channels;
+
+        debug_ipmovie("sending audio frame with pts %lld (%d audio frames)\n",
+            audio_pts, s->audio_frame_count);
+
+        chunk_type = CHUNK_VIDEO;
+
+    } else if (s->decode_map_chunk_offset) {
+
+        url_fseek(pb, s->decode_map_chunk_offset, SEEK_SET);
+        s->decode_map_chunk_offset = 0;
+
+        if (av_new_packet(pkt, s->decode_map_chunk_size))
+            return CHUNK_NOMEM;
+
+        pkt->stream_index = s->video_stream_index;
+        pkt->pts = s->video_pts;
+        if (get_buffer(pb, pkt->data, s->decode_map_chunk_size) != 
+            s->decode_map_chunk_size) {
+            av_free_packet(pkt);
+            return CHUNK_EOF;
+        }
+
+        chunk_type = CHUNK_VIDEO;
+
+    } else if (s->video_chunk_offset) {
+
+        url_fseek(pb, s->video_chunk_offset, SEEK_SET);
+        s->video_chunk_offset = 0;
+
+        if (av_new_packet(pkt, s->video_chunk_size))
+            return CHUNK_NOMEM;
+
+        pkt->stream_index = s->video_stream_index;
+        pkt->pts = s->video_pts;
+        if (get_buffer(pb, pkt->data, s->video_chunk_size) != 
+            s->video_chunk_size) {
+            av_free_packet(pkt);
+            return CHUNK_EOF;
+        }
+
+        s->video_pts += s->frame_pts_inc;
+
+        chunk_type = CHUNK_VIDEO;
+
+    } else {
+
+        url_fseek(pb, s->next_chunk_offset, SEEK_SET);
+        chunk_type = CHUNK_DONE;
+
+    }
+
+    return chunk_type;
+}
+
+/* This function loads and processes a single chunk in an IP movie file.
+ * It returns the type of chunk that was processed. */
+static int process_ipmovie_chunk(IPMVEContext *s, ByteIOContext *pb, 
+    AVPacket *pkt)
+{
+    unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
+    int chunk_type;
+    int chunk_size;
+    unsigned char opcode_preamble[OPCODE_PREAMBLE_SIZE];
+    unsigned char opcode_type;
+    unsigned char opcode_version;
+    int opcode_size;
+    unsigned char scratch[1024];
+    int j;
+    int first_color, last_color;
+    int audio_flags;
+
+    /* see if there are any pending packets */
+    chunk_type = load_ipmovie_packet(s, pb, pkt);
+    if ((chunk_type == CHUNK_VIDEO) && (chunk_type != CHUNK_DONE))
+        return chunk_type;
+
+    /* read the next chunk, wherever the file happens to be pointing */
+    if (url_feof(pb))
+        return CHUNK_EOF;
+    if (get_buffer(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
+        CHUNK_PREAMBLE_SIZE)
+        return CHUNK_BAD;
+    chunk_size = LE_16(&chunk_preamble[0]);
+    chunk_type = LE_16(&chunk_preamble[2]);
+
+    debug_ipmovie("chunk type 0x%04X, 0x%04X bytes: ", chunk_type, chunk_size);
+
+    switch (chunk_type) {
+
+    case CHUNK_INIT_AUDIO:
+        debug_ipmovie("initialize audio\n");
+        break;
+
+    case CHUNK_AUDIO_ONLY:
+        debug_ipmovie("audio only\n");
+        break;
+
+    case CHUNK_INIT_VIDEO:
+        debug_ipmovie("initialize video\n");
+        break;
+
+    case CHUNK_VIDEO:
+        debug_ipmovie("video (and audio)\n");
+        break;
+
+    case CHUNK_SHUTDOWN:
+        debug_ipmovie("shutdown\n");
+        break;
+
+    case CHUNK_END:
+        debug_ipmovie("end\n");
+        break;
+
+    default:
+        debug_ipmovie("invalid chunk\n");
+        chunk_type = CHUNK_BAD;
+        break;
+
+    }
+
+    while ((chunk_size > 0) && (chunk_type != CHUNK_BAD)) {
+
+        /* read the next chunk, wherever the file happens to be pointing */
+       if (url_feof(pb)) {
+            chunk_type = CHUNK_EOF;
+            break;
+        }
+        if (get_buffer(pb, opcode_preamble, CHUNK_PREAMBLE_SIZE) !=
+            CHUNK_PREAMBLE_SIZE) {
+            chunk_type = CHUNK_BAD;
+            break;
+        }
+
+        opcode_size = LE_16(&opcode_preamble[0]);
+        opcode_type = opcode_preamble[2];
+        opcode_version = opcode_preamble[3];
+
+        chunk_size -= OPCODE_PREAMBLE_SIZE;
+        chunk_size -= opcode_size;
+        if (chunk_size < 0) {
+            debug_ipmovie("chunk_size countdown just went negative\n");
+            chunk_type = CHUNK_BAD;
+            break;
+        }
+
+        debug_ipmovie("  opcode type %02X, version %d, 0x%04X bytes: ",
+            opcode_type, opcode_version, opcode_size);
+        switch (opcode_type) {
+
+        case OPCODE_END_OF_STREAM:
+            debug_ipmovie("end of stream\n");
+            url_fseek(pb, opcode_size, SEEK_CUR);
+            break;
+
+        case OPCODE_END_OF_CHUNK:
+            debug_ipmovie("end of chunk\n");
+            url_fseek(pb, opcode_size, SEEK_CUR);
+            break;
+
+        case OPCODE_CREATE_TIMER:
+            debug_ipmovie("create timer\n");
+            if ((opcode_version > 0) || (opcode_size > 6)) {
+                debug_ipmovie("bad create_timer opcode\n");
+                chunk_type = CHUNK_BAD;
+                break;
+            }
+            if (get_buffer(pb, scratch, opcode_size) !=
+                opcode_size) {
+                chunk_type = CHUNK_BAD;
+                break;
+            }
+            s->fps = 1000000 / (LE_32(&scratch[0]) * LE_16(&scratch[4]));
+            s->fps++;  /* above calculation usually yields 14.9; we need 15 */
+            s->frame_pts_inc = 90000 / s->fps;
+            debug_ipmovie("%d frames/second (timer div = %d, subdiv = %d)\n",
+                s->fps, LE_32(&scratch[0]), LE_16(&scratch[4]));
+            break;
+
+        case OPCODE_INIT_AUDIO_BUFFERS:
+            debug_ipmovie("initialize audio buffers\n");
+            if ((opcode_version > 1) || (opcode_size > 10)) {
+                debug_ipmovie("bad init_audio_buffers opcode\n");
+                chunk_type = CHUNK_BAD;
+                break;
+            }
+            if (get_buffer(pb, scratch, opcode_size) !=
+                opcode_size) {
+                chunk_type = CHUNK_BAD;
+                break;
+            }
+            s->audio_sample_rate = LE_16(&scratch[4]);
+            audio_flags = LE_16(&scratch[2]);
+            /* bit 0 of the flags: 0 = mono, 1 = stereo */
+            s->audio_channels = (audio_flags & 1) + 1;
+            /* bit 1 of the flags: 0 = 8 bit, 1 = 16 bit */
+            s->audio_bits = (((audio_flags >> 1) & 1) + 1) * 8;
+            /* bit 2 indicates compressed audio in version 1 opcode */
+            if ((opcode_version == 1) && (audio_flags & 0x4))
+                s->audio_type = CODEC_ID_INTERPLAY_DPCM;
+            else if (s->audio_bits == 16)
+                s->audio_type = CODEC_ID_PCM_S16LE;
+            else
+                s->audio_type = CODEC_ID_PCM_U8;
+            debug_ipmovie("audio: %d bits, %d Hz, %s, %s format\n",
+                s->audio_bits,
+                s->audio_sample_rate,
+                (s->audio_channels == 2) ? "stereo" : "mono",
+                (s->audio_type == CODEC_ID_INTERPLAY_DPCM) ? 
+                "Interplay audio" : "PCM");
+            break;
+
+        case OPCODE_START_STOP_AUDIO:
+            debug_ipmovie("start/stop audio\n");
+            url_fseek(pb, opcode_size, SEEK_CUR);
+            break;
+
+        case OPCODE_INIT_VIDEO_BUFFERS:
+            debug_ipmovie("initialize video buffers\n");
+            if ((opcode_version > 2) || (opcode_size > 8)) {
+                debug_ipmovie("bad init_video_buffers opcode\n");
+                chunk_type = CHUNK_BAD;
+                break;
+            }
+            if (get_buffer(pb, scratch, opcode_size) !=
+                opcode_size) {
+                chunk_type = CHUNK_BAD;
+                break;
+            }
+            s->video_width = LE_16(&scratch[0]) * 8;
+            s->video_height = LE_16(&scratch[2]) * 8;
+            debug_ipmovie("video resolution: %d x %d\n",
+                s->video_width, s->video_height);
+            break;
+
+        case OPCODE_UNKNOWN_06:
+        case OPCODE_UNKNOWN_0E:
+        case OPCODE_UNKNOWN_10:
+        case OPCODE_UNKNOWN_12:
+        case OPCODE_UNKNOWN_13:
+        case OPCODE_UNKNOWN_14:
+        case OPCODE_UNKNOWN_15:
+            debug_ipmovie("unknown (but documented) opcode %02X\n", opcode_type);
+            url_fseek(pb, opcode_size, SEEK_CUR);
+            break;
+
+        case OPCODE_SEND_BUFFER:
+            debug_ipmovie("send buffer\n");
+            url_fseek(pb, opcode_size, SEEK_CUR);
+            break;
+
+        case OPCODE_AUDIO_FRAME:
+            debug_ipmovie("audio frame\n");
+
+            /* log position and move on for now */
+            s->audio_chunk_offset = url_ftell(pb);
+            s->audio_chunk_size = opcode_size;
+            url_fseek(pb, opcode_size, SEEK_CUR);
+            break;
+
+        case OPCODE_SILENCE_FRAME:
+            debug_ipmovie("silence frame\n");
+            url_fseek(pb, opcode_size, SEEK_CUR);
+            break;
+
+        case OPCODE_INIT_VIDEO_MODE:
+            debug_ipmovie("initialize video mode\n");
+            url_fseek(pb, opcode_size, SEEK_CUR);
+            break;
+
+        case OPCODE_CREATE_GRADIENT:
+            debug_ipmovie("create gradient\n");
+            url_fseek(pb, opcode_size, SEEK_CUR);
+            break;
+
+        case OPCODE_SET_PALETTE:
+            debug_ipmovie("set palette\n");
+            /* check for the logical maximum palette size
+             * (3 * 256 + 4 bytes) */
+            if (opcode_size > 0x304) {
+                debug_ipmovie("demux_ipmovie: set_palette opcode too large\n");
+                chunk_type = CHUNK_BAD;
+                break;
+            }
+            if (get_buffer(pb, scratch, opcode_size) != opcode_size) {
+                chunk_type = CHUNK_BAD;
+                break;
+            }
+
+            /* load the palette into internal data structure */
+            first_color = LE_16(&scratch[0]);
+            last_color = LE_16(&scratch[2]);
+            /* sanity check (since they are 16 bit values) */
+            if ((first_color > 0xFF) || (last_color > 0xFF)) {
+                debug_ipmovie("demux_ipmovie: set_palette indices out of range (%d -> %d)\n",
+                    first_color, last_color);
+                chunk_type = CHUNK_BAD;
+                break;
+            }
+            j = 4;  /* offset of first palette data */
+#if 0
+            for (i = first_color; i <= last_color; i++) {
+                s->palette[i].r = scratch[j++] * 4;
+                s->palette[i].g = scratch[j++] * 4;
+                s->palette[i].b = scratch[j++] * 4;
+            }
+#endif
+            break;
+
+        case OPCODE_SET_PALETTE_COMPRESSED:
+            debug_ipmovie("set palette compressed\n");
+            url_fseek(pb, opcode_size, SEEK_CUR);
+            break;
+
+        case OPCODE_SET_DECODING_MAP:
+            debug_ipmovie("set decoding map\n");
+
+            /* log position and move on for now */
+            s->decode_map_chunk_offset = url_ftell(pb);
+            s->decode_map_chunk_size = opcode_size;
+            url_fseek(pb, opcode_size, SEEK_CUR);
+            break;
+
+        case OPCODE_VIDEO_DATA:
+            debug_ipmovie("set video data\n");
+
+            /* log position and move on for now */
+            s->video_chunk_offset = url_ftell(pb);
+            s->video_chunk_size = opcode_size;
+            url_fseek(pb, opcode_size, SEEK_CUR);
+            break;
+
+        default:
+            debug_ipmovie("*** unknown opcode type\n");
+            chunk_type = CHUNK_BAD;
+            break;
+
+        }
+    }
+
+    /* make a note of where the stream is sitting */
+    s->next_chunk_offset = url_ftell(pb);
+
+    /* dispatch the first of any pending packets */
+    if ((chunk_type == CHUNK_VIDEO) || (chunk_type == CHUNK_AUDIO_ONLY))
+        chunk_type = load_ipmovie_packet(s, pb, pkt);
+
+    return chunk_type;
+}
+
+static int ipmovie_probe(AVProbeData *p)
+{
+    if (p->buf_size < IPMOVIE_SIGNATURE_SIZE)
+        return 0;
+    if (strncmp(p->buf, IPMOVIE_SIGNATURE, IPMOVIE_SIGNATURE_SIZE) != 0)
+        return 0;
+
+    return AVPROBE_SCORE_MAX;
+}
+
+static int ipmovie_read_header(AVFormatContext *s,
+                               AVFormatParameters *ap)
+{
+    IPMVEContext *ipmovie = (IPMVEContext *)s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    AVPacket pkt;
+    AVStream *st;
+
+    /* initialize private context members */
+    ipmovie->video_pts = ipmovie->audio_frame_count = 0;
+    ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset =
+    ipmovie->decode_map_chunk_offset = 0;
+
+    /* on the first read, this will position the stream at the first chunk */
+    ipmovie->next_chunk_offset = IPMOVIE_SIGNATURE_SIZE + 6;
+
+    /* process the first chunk which should be CHUNK_INIT_VIDEO */
+    if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO)
+        return AVERROR_INVALIDDATA;
+
+    /* process the next chunk which should be CHUNK_INIT_AUDIO */
+    if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO)
+        return AVERROR_INVALIDDATA;
+
+    /* set the pts reference (1 pts = 1/90000) */
+    s->pts_num = 1;
+    s->pts_den = 90000;
+
+    /* initialize the stream decoders */
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+    ipmovie->video_stream_index = st->index;
+    st->codec.codec_type = CODEC_TYPE_VIDEO;
+    st->codec.codec_id = CODEC_ID_INTERPLAY_VIDEO;
+    st->codec.codec_tag = 0;  /* no fourcc */
+    st->codec.width = ipmovie->video_width;
+    st->codec.height = ipmovie->video_height;
+
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR_NOMEM;
+    ipmovie->audio_stream_index = st->index;
+    st->codec.codec_type = CODEC_TYPE_AUDIO;
+    st->codec.codec_id = ipmovie->audio_type;
+    st->codec.codec_tag = 0;  /* no tag */
+    st->codec.channels = ipmovie->audio_channels;
+    st->codec.sample_rate = ipmovie->audio_sample_rate;
+    st->codec.bits_per_sample = ipmovie->audio_bits;
+    st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
+        st->codec.bits_per_sample / 
+        (st->codec.codec_id == CODEC_ID_INTERPLAY_DPCM) ? 2 : 1;
+    st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
+
+    return 0;
+}
+
+static int ipmovie_read_packet(AVFormatContext *s,
+                               AVPacket *pkt)
+{
+    IPMVEContext *ipmovie = (IPMVEContext *)s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    int ret;
+
+    ret = process_ipmovie_chunk(ipmovie, pb, pkt);
+    if (ret == CHUNK_BAD)
+        ret = AVERROR_INVALIDDATA;
+    else if (ret == CHUNK_EOF)
+        ret = -EIO;
+    else if (ret == CHUNK_NOMEM)
+        ret = AVERROR_NOMEM;
+    else
+        ret = 0;
+
+    return ret;
+}
+
+static int ipmovie_read_close(AVFormatContext *s)
+{
+//    IPMVEContext *ipmovie = (IPMVEContext *)s->priv_data;
+
+    return 0;
+}
+
+static AVInputFormat ipmovie_iformat = {
+    "ipmovie",
+    "Interplay MVE format",
+    sizeof(IPMVEContext),
+    ipmovie_probe,
+    ipmovie_read_header,
+    ipmovie_read_packet,
+    ipmovie_read_close,
+};
+
+int ipmovie_init(void)
+{
+    av_register_input_format(&ipmovie_iformat);
+    return 0;
+}
+