/*
  * Interplay MVE File Demuxer

  * 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

  * 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 "libavutil/channel_layout.h"

 #include "libavutil/intreadwrite.h"

 #include "avformat.h"

 #include "internal.h"

 
 #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 {

     AVFormatContext *avf;

     unsigned char *buf;
     int buf_size;
 

     uint64_t frame_pts_inc;

     unsigned int video_bpp;

     unsigned int video_width;
     unsigned int video_height;
     int64_t video_pts;

     uint32_t     palette[256];
     int          has_palette;

     int          changed;

 
     unsigned int audio_bits;
     unsigned int audio_channels;
     unsigned int audio_sample_rate;

     enum AVCodecID audio_type;

     unsigned int audio_frame_count;
 
     int video_stream_index;
     int audio_stream_index;
 

     int64_t audio_chunk_offset;

     int audio_chunk_size;

     int64_t video_chunk_offset;

     int video_chunk_size;

     int64_t decode_map_chunk_offset;

     int decode_map_chunk_size;
 

     int64_t next_chunk_offset;

 
 } IPMVEContext;
 

 static int load_ipmovie_packet(IPMVEContext *s, AVIOContext *pb,

     AVPacket *pkt) {
 
     int chunk_type;
 

     if (s->audio_chunk_offset && s->audio_channels && s->audio_bits) {

         if (s->audio_type == AV_CODEC_ID_NONE) {

             av_log(s->avf, AV_LOG_ERROR, "Can not read audio packet before"

                    "audio codec is known\n");
                 return CHUNK_BAD;
         }

         /* adjust for PCM audio by skipping chunk header */

         if (s->audio_type != AV_CODEC_ID_INTERPLAY_DPCM) {

             s->audio_chunk_offset += 6;
             s->audio_chunk_size -= 6;
         }
 

         avio_seek(pb, s->audio_chunk_offset, SEEK_SET);

         s->audio_chunk_offset = 0;
 

         if (s->audio_chunk_size != av_get_packet(pb, pkt, s->audio_chunk_size))
             return CHUNK_EOF;

 
         pkt->stream_index = s->audio_stream_index;

         pkt->pts = s->audio_frame_count;

 
         /* audio frame maintenance */

         if (s->audio_type != AV_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) / s->audio_channels;

         av_log(s->avf, AV_LOG_TRACE, "sending audio frame with pts %"PRId64" (%d audio frames)\n",

                 pkt->pts, s->audio_frame_count);

 
         chunk_type = CHUNK_VIDEO;
 
     } else if (s->decode_map_chunk_offset) {
 

         /* send both the decode map and the video data together */

         if (av_new_packet(pkt, 2 + s->decode_map_chunk_size + s->video_chunk_size))

             return CHUNK_NOMEM;
 

         if (s->has_palette) {
             uint8_t *pal;
 
             pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
                                           AVPALETTE_SIZE);
             if (pal) {
                 memcpy(pal, s->palette, AVPALETTE_SIZE);
                 s->has_palette = 0;
             }
         }
 

         if (s->changed) {
             ff_add_param_change(pkt, 0, 0, 0, s->video_width, s->video_height);
             s->changed = 0;
         }

         pkt->pos= s->decode_map_chunk_offset;

         avio_seek(pb, s->decode_map_chunk_offset, SEEK_SET);

         s->decode_map_chunk_offset = 0;
 

         AV_WL16(pkt->data, s->decode_map_chunk_size);
         if (avio_read(pb, pkt->data + 2, s->decode_map_chunk_size) !=

             s->decode_map_chunk_size) {

             av_packet_unref(pkt);

             return CHUNK_EOF;
         }
 

         avio_seek(pb, s->video_chunk_offset, SEEK_SET);

         s->video_chunk_offset = 0;
 

         if (avio_read(pb, pkt->data + 2 + s->decode_map_chunk_size,

             s->video_chunk_size) != s->video_chunk_size) {

             av_packet_unref(pkt);

             return CHUNK_EOF;
         }
 

         pkt->stream_index = s->video_stream_index;
         pkt->pts = s->video_pts;
 

         av_log(s->avf, AV_LOG_TRACE, "sending video frame with pts %"PRId64"\n", pkt->pts);

         s->video_pts += s->frame_pts_inc;
 
         chunk_type = CHUNK_VIDEO;
 
     } else {
 

         avio_seek(pb, s->next_chunk_offset, SEEK_SET);

         chunk_type = CHUNK_DONE;
 
     }
 
     return chunk_type;
 }
 

 static int init_audio(AVFormatContext *s)
 {
     IPMVEContext *ipmovie = s->priv_data;
     AVStream *st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);
     avpriv_set_pts_info(st, 32, 1, ipmovie->audio_sample_rate);
     ipmovie->audio_stream_index = st->index;

     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     st->codecpar->codec_id = ipmovie->audio_type;
     st->codecpar->codec_tag = 0;  /* no tag */
     st->codecpar->channels = ipmovie->audio_channels;
     st->codecpar->channel_layout = st->codecpar->channels == 1 ? AV_CH_LAYOUT_MONO :

                                                             AV_CH_LAYOUT_STEREO;

     st->codecpar->sample_rate = ipmovie->audio_sample_rate;
     st->codecpar->bits_per_coded_sample = ipmovie->audio_bits;
     st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate *
         st->codecpar->bits_per_coded_sample;
     if (st->codecpar->codec_id == AV_CODEC_ID_INTERPLAY_DPCM)
         st->codecpar->bit_rate /= 2;
     st->codecpar->block_align = st->codecpar->channels * st->codecpar->bits_per_coded_sample;

 
     return 0;
 }
 

 /* 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, AVIOContext *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 i, j;

     int first_color, last_color;
     int audio_flags;

     unsigned char r, g, b;

     unsigned int width, height;

 
     /* see if there are any pending packets */
     chunk_type = load_ipmovie_packet(s, pb, pkt);

     if (chunk_type != CHUNK_DONE)

         return chunk_type;
 
     /* read the next chunk, wherever the file happens to be pointing */

     if (avio_feof(pb))

         return CHUNK_EOF;

     if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=

         CHUNK_PREAMBLE_SIZE)
         return CHUNK_BAD;

     chunk_size = AV_RL16(&chunk_preamble[0]);
     chunk_type = AV_RL16(&chunk_preamble[2]);

     av_log(s->avf, AV_LOG_TRACE, "chunk type 0x%04X, 0x%04X bytes: ", chunk_type, chunk_size);

 
     switch (chunk_type) {
 
     case CHUNK_INIT_AUDIO:

         av_log(s->avf, AV_LOG_TRACE, "initialize audio\n");

         break;
 
     case CHUNK_AUDIO_ONLY:

         av_log(s->avf, AV_LOG_TRACE, "audio only\n");

         break;
 
     case CHUNK_INIT_VIDEO:

         av_log(s->avf, AV_LOG_TRACE, "initialize video\n");

         break;
 
     case CHUNK_VIDEO:

         av_log(s->avf, AV_LOG_TRACE, "video (and audio)\n");

         break;
 
     case CHUNK_SHUTDOWN:

         av_log(s->avf, AV_LOG_TRACE, "shutdown\n");

         break;
 
     case CHUNK_END:

         av_log(s->avf, AV_LOG_TRACE, "end\n");

         break;
 
     default:

         av_log(s->avf, AV_LOG_TRACE, "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 (avio_feof(pb)) {

             chunk_type = CHUNK_EOF;
             break;
         }

         if (avio_read(pb, opcode_preamble, CHUNK_PREAMBLE_SIZE) !=

             CHUNK_PREAMBLE_SIZE) {
             chunk_type = CHUNK_BAD;
             break;
         }
 

         opcode_size = AV_RL16(&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) {

             av_log(s->avf, AV_LOG_TRACE, "chunk_size countdown just went negative\n");

             chunk_type = CHUNK_BAD;
             break;
         }
 

         av_log(s->avf, AV_LOG_TRACE, "  opcode type %02X, version %d, 0x%04X bytes: ",

                 opcode_type, opcode_version, opcode_size);

         switch (opcode_type) {
 
         case OPCODE_END_OF_STREAM:

             av_log(s->avf, AV_LOG_TRACE, "end of stream\n");

             avio_skip(pb, opcode_size);

             break;
 
         case OPCODE_END_OF_CHUNK:

             av_log(s->avf, AV_LOG_TRACE, "end of chunk\n");

             avio_skip(pb, opcode_size);

             break;
 
         case OPCODE_CREATE_TIMER:

             av_log(s->avf, AV_LOG_TRACE, "create timer\n");

             if ((opcode_version > 0) || (opcode_size != 6)) {

                 av_log(s->avf, AV_LOG_TRACE, "bad create_timer opcode\n");

                 chunk_type = CHUNK_BAD;
                 break;
             }

             if (avio_read(pb, scratch, opcode_size) !=

                 opcode_size) {
                 chunk_type = CHUNK_BAD;
                 break;
             }

             s->frame_pts_inc = ((uint64_t)AV_RL32(&scratch[0])) * AV_RL16(&scratch[4]);

             av_log(s->avf, AV_LOG_TRACE, "  %.2f frames/second (timer div = %d, subdiv = %d)\n",

                     1000000.0 / s->frame_pts_inc, AV_RL32(&scratch[0]),
                     AV_RL16(&scratch[4]));

             break;
 
         case OPCODE_INIT_AUDIO_BUFFERS:

             av_log(s->avf, AV_LOG_TRACE, "initialize audio buffers\n");

             if (opcode_version > 1 || opcode_size > 10 || opcode_size < 6) {

                 av_log(s->avf, AV_LOG_TRACE, "bad init_audio_buffers opcode\n");

                 chunk_type = CHUNK_BAD;
                 break;
             }

             if (avio_read(pb, scratch, opcode_size) !=

                 opcode_size) {
                 chunk_type = CHUNK_BAD;
                 break;
             }

             s->audio_sample_rate = AV_RL16(&scratch[4]);
             audio_flags = AV_RL16(&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 = AV_CODEC_ID_INTERPLAY_DPCM;

             else if (s->audio_bits == 16)

                 s->audio_type = AV_CODEC_ID_PCM_S16LE;

             else

                 s->audio_type = AV_CODEC_ID_PCM_U8;

             av_log(s->avf, AV_LOG_TRACE, "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 == AV_CODEC_ID_INTERPLAY_DPCM) ?

                     "Interplay audio" : "PCM");

             break;
 
         case OPCODE_START_STOP_AUDIO:

             av_log(s->avf, AV_LOG_TRACE, "start/stop audio\n");

             avio_skip(pb, opcode_size);

             break;
 
         case OPCODE_INIT_VIDEO_BUFFERS:

             av_log(s->avf, AV_LOG_TRACE, "initialize video buffers\n");

             if ((opcode_version > 2) || (opcode_size > 8) || opcode_size < 4
                 || opcode_version == 2 && opcode_size < 8
             ) {

                 av_log(s->avf, AV_LOG_TRACE, "bad init_video_buffers opcode\n");

                 chunk_type = CHUNK_BAD;
                 break;
             }

             if (avio_read(pb, scratch, opcode_size) !=

                 opcode_size) {
                 chunk_type = CHUNK_BAD;
                 break;
             }

             width  = AV_RL16(&scratch[0]) * 8;
             height = AV_RL16(&scratch[2]) * 8;
             if (width != s->video_width) {
                 s->video_width = width;
                 s->changed++;
             }
             if (height != s->video_height) {
                 s->video_height = height;
                 s->changed++;
             }

             if (opcode_version < 2 || !AV_RL16(&scratch[6])) {
                 s->video_bpp = 8;
             } else {
                 s->video_bpp = 16;
             }

             av_log(s->avf, AV_LOG_TRACE, "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:

             av_log(s->avf, AV_LOG_TRACE, "unknown (but documented) opcode %02X\n", opcode_type);

             avio_skip(pb, opcode_size);

             break;
 
         case OPCODE_SEND_BUFFER:

             av_log(s->avf, AV_LOG_TRACE, "send buffer\n");

             avio_skip(pb, opcode_size);

             break;
 
         case OPCODE_AUDIO_FRAME:

             av_log(s->avf, AV_LOG_TRACE, "audio frame\n");

 
             /* log position and move on for now */

             s->audio_chunk_offset = avio_tell(pb);

             s->audio_chunk_size = opcode_size;

             avio_skip(pb, opcode_size);

             break;
 
         case OPCODE_SILENCE_FRAME:

             av_log(s->avf, AV_LOG_TRACE, "silence frame\n");

             avio_skip(pb, opcode_size);

             break;
 
         case OPCODE_INIT_VIDEO_MODE:

             av_log(s->avf, AV_LOG_TRACE, "initialize video mode\n");

             avio_skip(pb, opcode_size);

             break;
 
         case OPCODE_CREATE_GRADIENT:

             av_log(s->avf, AV_LOG_TRACE, "create gradient\n");

             avio_skip(pb, opcode_size);

             break;
 
         case OPCODE_SET_PALETTE:

             av_log(s->avf, AV_LOG_TRACE, "set palette\n");

             /* check for the logical maximum palette size
              * (3 * 256 + 4 bytes) */

             if (opcode_size > 0x304 || opcode_size < 4) {

                 av_log(s->avf, AV_LOG_TRACE, "demux_ipmovie: set_palette opcode with invalid size\n");

                 chunk_type = CHUNK_BAD;
                 break;
             }

             if (avio_read(pb, scratch, opcode_size) != opcode_size) {

                 chunk_type = CHUNK_BAD;
                 break;
             }
 
             /* load the palette into internal data structure */

             first_color = AV_RL16(&scratch[0]);
             last_color = first_color + AV_RL16(&scratch[2]) - 1;

             /* sanity check (since they are 16 bit values) */

             if (   (first_color > 0xFF) || (last_color > 0xFF)
                 || (last_color - first_color + 1)*3 + 4 > opcode_size) {

                 av_log(s->avf, AV_LOG_TRACE, "demux_ipmovie: set_palette indexes out of range (%d -> %d)\n",

                     first_color, last_color);
                 chunk_type = CHUNK_BAD;
                 break;
             }
             j = 4;  /* offset of first palette data */
             for (i = first_color; i <= last_color; i++) {

                 /* the palette is stored as a 6-bit VGA palette, thus each
                  * component is shifted up to a 8-bit range */

                 r = scratch[j++] * 4;
                 g = scratch[j++] * 4;
                 b = scratch[j++] * 4;

                 s->palette[i] = (0xFFU << 24) | (r << 16) | (g << 8) | (b);
                 s->palette[i] |= s->palette[i] >> 6 & 0x30303;

             }

             s->has_palette = 1;

             break;
 
         case OPCODE_SET_PALETTE_COMPRESSED:

             av_log(s->avf, AV_LOG_TRACE, "set palette compressed\n");

             avio_skip(pb, opcode_size);

             break;
 
         case OPCODE_SET_DECODING_MAP:

             av_log(s->avf, AV_LOG_TRACE, "set decoding map\n");

 
             /* log position and move on for now */

             s->decode_map_chunk_offset = avio_tell(pb);

             s->decode_map_chunk_size = opcode_size;

             avio_skip(pb, opcode_size);

             break;
 
         case OPCODE_VIDEO_DATA:

             av_log(s->avf, AV_LOG_TRACE, "set video data\n");

 
             /* log position and move on for now */

             s->video_chunk_offset = avio_tell(pb);

             s->video_chunk_size = opcode_size;

             avio_skip(pb, opcode_size);

             break;
 
         default:

             av_log(s->avf, AV_LOG_TRACE, "*** unknown opcode type\n");

             chunk_type = CHUNK_BAD;
             break;
 
         }
     }
 

     if (s->avf->nb_streams == 1 && s->audio_type)
         init_audio(s->avf);
 

     /* make a note of where the stream is sitting */

     s->next_chunk_offset = avio_tell(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 const char signature[] = "Interplay MVE File\x1A\0\x1A";
 

 static int ipmovie_probe(AVProbeData *p)
 {

     const uint8_t *b = p->buf;
     const uint8_t *b_end = p->buf + p->buf_size - sizeof(signature);

     do {

         if (b[0] == signature[0] && memcmp(b, signature, sizeof(signature)) == 0)

             return AVPROBE_SCORE_MAX;

         b++;

     } while (b < b_end);
 
     return 0;

 }
 

 static int ipmovie_read_header(AVFormatContext *s)

 {

     IPMVEContext *ipmovie = s->priv_data;

     AVIOContext *pb = s->pb;

     AVPacket pkt;
     AVStream *st;

     unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];

     int chunk_type, i;

     uint8_t signature_buffer[sizeof(signature)];
 

     ipmovie->avf = s;
 

     avio_read(pb, signature_buffer, sizeof(signature_buffer));

     while (memcmp(signature_buffer, signature, sizeof(signature))) {
         memmove(signature_buffer, signature_buffer + 1, sizeof(signature_buffer) - 1);

         signature_buffer[sizeof(signature_buffer) - 1] = avio_r8(pb);

         if (avio_feof(pb))

             return AVERROR_EOF;
     }

     /* 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 = avio_tell(pb) + 4;

     for (i = 0; i < 256; i++)
         ipmovie->palette[i] = 0xFFU << 24;
 

     /* process the first chunk which should be CHUNK_INIT_VIDEO */
     if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO)
         return AVERROR_INVALIDDATA;
 

     /* peek ahead to the next chunk-- if it is an init audio chunk, process
      * it; if it is the first video chunk, this is a silent file */

     if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=

         CHUNK_PREAMBLE_SIZE)

         return AVERROR(EIO);

     chunk_type = AV_RL16(&chunk_preamble[2]);

     avio_seek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR);

 
     if (chunk_type == CHUNK_VIDEO)

         ipmovie->audio_type = AV_CODEC_ID_NONE;  /* no audio */

     else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO)

         return AVERROR_INVALIDDATA;
 
     /* initialize the stream decoders */

     st = avformat_new_stream(s, NULL);

     if (!st)

         return AVERROR(ENOMEM);

     avpriv_set_pts_info(st, 63, 1, 1000000);

     ipmovie->video_stream_index = st->index;

     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
     st->codecpar->codec_id = AV_CODEC_ID_INTERPLAY_VIDEO;
     st->codecpar->codec_tag = 0;  /* no fourcc */
     st->codecpar->width = ipmovie->video_width;
     st->codecpar->height = ipmovie->video_height;
     st->codecpar->bits_per_coded_sample = ipmovie->video_bpp;

     if (ipmovie->audio_type) {

         return init_audio(s);

     } else
        s->ctx_flags |= AVFMTCTX_NOHEADER;

 
     return 0;
 }
 
 static int ipmovie_read_packet(AVFormatContext *s,
                                AVPacket *pkt)
 {

     IPMVEContext *ipmovie = s->priv_data;

     AVIOContext *pb = s->pb;

     int ret;
 

     for (;;) {

     ret = process_ipmovie_chunk(ipmovie, pb, pkt);
     if (ret == CHUNK_BAD)
         ret = AVERROR_INVALIDDATA;
     else if (ret == CHUNK_EOF)

         ret = AVERROR(EIO);

     else if (ret == CHUNK_NOMEM)

         ret = AVERROR(ENOMEM);

     else if (ret == CHUNK_VIDEO)

         ret = 0;

     else if (ret == CHUNK_INIT_VIDEO || ret == CHUNK_INIT_AUDIO)
         continue;

     else

         continue;

 
     return ret;

     }

 }
 

 AVInputFormat ff_ipmovie_demuxer = {

     .name           = "ipmovie",

     .long_name      = NULL_IF_CONFIG_SMALL("Interplay MVE"),

     .priv_data_size = sizeof(IPMVEContext),
     .read_probe     = ipmovie_probe,
     .read_header    = ipmovie_read_header,
     .read_packet    = ipmovie_read_packet,

 };