/*
  * Wing Commander III Movie (.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

  * Wing Commander III Movie file demuxer
  * by Mike Melanson (melanson@pcisys.net)
  * for more information on the WC3 .mve file format, visit:
  *   http://www.pcisys.net/~melanson/codecs/
  */
 

 #include "libavutil/channel_layout.h"

 #include "libavutil/intreadwrite.h"

 #include "libavutil/dict.h"

 #include "avformat.h"

 #include "internal.h"

 #define FORM_TAG MKTAG('F', 'O', 'R', 'M')
 #define MOVE_TAG MKTAG('M', 'O', 'V', 'E')

 #define  PC__TAG MKTAG('_', 'P', 'C', '_')

 #define SOND_TAG MKTAG('S', 'O', 'N', 'D')
 #define BNAM_TAG MKTAG('B', 'N', 'A', 'M')
 #define SIZE_TAG MKTAG('S', 'I', 'Z', 'E')
 #define PALT_TAG MKTAG('P', 'A', 'L', 'T')
 #define INDX_TAG MKTAG('I', 'N', 'D', 'X')
 #define BRCH_TAG MKTAG('B', 'R', 'C', 'H')
 #define SHOT_TAG MKTAG('S', 'H', 'O', 'T')
 #define VGA__TAG MKTAG('V', 'G', 'A', ' ')
 #define TEXT_TAG MKTAG('T', 'E', 'X', 'T')
 #define AUDI_TAG MKTAG('A', 'U', 'D', 'I')

 
 /* video resolution unless otherwise specified */
 #define WC3_DEFAULT_WIDTH 320
 #define WC3_DEFAULT_HEIGHT 165
 
 /* always use the same PCM audio parameters */
 #define WC3_SAMPLE_RATE 22050
 #define WC3_AUDIO_CHANNELS 1
 #define WC3_AUDIO_BITS 16
 
 /* nice, constant framerate */

 #define WC3_FRAME_FPS 15

 
 #define PALETTE_SIZE (256 * 3)
 
 typedef struct Wc3DemuxContext {
     int width;
     int height;
     int64_t pts;
     int video_stream_index;
     int audio_stream_index;
 

     AVPacket vpkt;

 
 } Wc3DemuxContext;
 
 static int wc3_probe(AVProbeData *p)
 {
     if (p->buf_size < 12)
         return 0;
 

     if ((AV_RL32(&p->buf[0]) != FORM_TAG) ||
         (AV_RL32(&p->buf[8]) != MOVE_TAG))

         return 0;
 
     return AVPROBE_SCORE_MAX;
 }
 

 static int wc3_read_header(AVFormatContext *s)

 {

     Wc3DemuxContext *wc3 = s->priv_data;

     AVIOContext *pb = s->pb;

     unsigned int fourcc_tag;
     unsigned int size;
     AVStream *st;
     int ret = 0;

     char *buffer;

 
     /* default context members */
     wc3->width = WC3_DEFAULT_WIDTH;
     wc3->height = WC3_DEFAULT_HEIGHT;
     wc3->pts = 0;
     wc3->video_stream_index = wc3->audio_stream_index = 0;

     av_init_packet(&wc3->vpkt);
     wc3->vpkt.data = NULL; wc3->vpkt.size = 0;

 
     /* skip the first 3 32-bit numbers */

     avio_skip(pb, 12);

 
     /* traverse through the chunks and load the header information before
      * the first BRCH tag */

     fourcc_tag = avio_rl32(pb);
     size = (avio_rb32(pb) + 1) & (~1);

 
     do {
         switch (fourcc_tag) {
 
         case SOND_TAG:
         case INDX_TAG:
             /* SOND unknown, INDX unnecessary; ignore both */

             avio_skip(pb, size);

             break;
 

         case PC__TAG:

             /* number of palettes, unneeded */

             avio_skip(pb, 12);

             break;
 
         case BNAM_TAG:
             /* load up the name */

             buffer = av_malloc(size+1);
             if (!buffer)

                 return AVERROR(ENOMEM);

             if ((ret = avio_read(pb, buffer, size)) != size)

                 return AVERROR(EIO);

             buffer[size] = 0;

             av_dict_set(&s->metadata, "title", buffer,
                                    AV_DICT_DONT_STRDUP_VAL);

             break;
 
         case SIZE_TAG:
             /* video resolution override */

             wc3->width  = avio_rl32(pb);
             wc3->height = avio_rl32(pb);

             break;
 
         case PALT_TAG:
             /* one of several palettes */

             avio_seek(pb, -8, SEEK_CUR);

             av_append_packet(pb, &wc3->vpkt, 8 + PALETTE_SIZE);

             break;
 
         default:

             av_log(s, AV_LOG_ERROR, "  unrecognized WC3 chunk: %c%c%c%c (0x%02X%02X%02X%02X)\n",

                 (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24),
                 (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24));

             return AVERROR_INVALIDDATA;
         }
 

         fourcc_tag = avio_rl32(pb);

         /* chunk sizes are 16-bit aligned */

         size = (avio_rb32(pb) + 1) & (~1);

         if (url_feof(pb))
             return AVERROR(EIO);

 
     } while (fourcc_tag != BRCH_TAG);
 
     /* initialize the decoder streams */

     st = avformat_new_stream(s, NULL);

     if (!st)

         return AVERROR(ENOMEM);

     avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS);

     wc3->video_stream_index = st->index;

     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

     st->codec->codec_id = AV_CODEC_ID_XAN_WC3;

     st->codec->codec_tag = 0;  /* no fourcc */
     st->codec->width = wc3->width;
     st->codec->height = wc3->height;

     st = avformat_new_stream(s, NULL);

     if (!st)

         return AVERROR(ENOMEM);

     avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS);

     wc3->audio_stream_index = st->index;

     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

     st->codec->codec_id = AV_CODEC_ID_PCM_S16LE;

     st->codec->codec_tag = 1;
     st->codec->channels = WC3_AUDIO_CHANNELS;

     st->codec->channel_layout = AV_CH_LAYOUT_MONO;

     st->codec->bits_per_coded_sample = WC3_AUDIO_BITS;

     st->codec->sample_rate = WC3_SAMPLE_RATE;
     st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *

         st->codec->bits_per_coded_sample;

     st->codec->block_align = WC3_AUDIO_BITS * WC3_AUDIO_CHANNELS;

 
     return 0;
 }
 
 static int wc3_read_packet(AVFormatContext *s,
                            AVPacket *pkt)
 {

     Wc3DemuxContext *wc3 = s->priv_data;

     AVIOContext *pb = s->pb;

     unsigned int fourcc_tag;
     unsigned int size;
     int packet_read = 0;
     int ret = 0;
     unsigned char text[1024];
 
     while (!packet_read) {
 

         fourcc_tag = avio_rl32(pb);

         /* chunk sizes are 16-bit aligned */

         size = (avio_rb32(pb) + 1) & (~1);

         if (url_feof(pb))
             return AVERROR(EIO);

 
         switch (fourcc_tag) {
 
         case BRCH_TAG:
             /* no-op */
             break;
 
         case SHOT_TAG:
             /* load up new palette */

             avio_seek(pb, -8, SEEK_CUR);

             av_append_packet(pb, &wc3->vpkt, 8 + 4);

             break;
 
         case VGA__TAG:
             /* send out video chunk */

             avio_seek(pb, -8, SEEK_CUR);

             ret= av_append_packet(pb, &wc3->vpkt, 8 + size);
             // ignore error if we have some data
             if (wc3->vpkt.size > 0)
                 ret = 0;
             *pkt = wc3->vpkt;
             wc3->vpkt.data = NULL; wc3->vpkt.size = 0;

             pkt->stream_index = wc3->video_stream_index;
             pkt->pts = wc3->pts;
             packet_read = 1;
             break;
 
         case TEXT_TAG:
             /* subtitle chunk */
 #if 0

             avio_skip(pb, size);

 #else

             if ((unsigned)size > sizeof(text) || (ret = avio_read(pb, text, size)) != size)

                 ret = AVERROR(EIO);

             else {
                 int i = 0;

                 av_log (s, AV_LOG_DEBUG, "Subtitle time!\n");
                 av_log (s, AV_LOG_DEBUG, "  inglish: %s\n", &text[i + 1]);

                 i += text[i] + 1;

                 av_log (s, AV_LOG_DEBUG, "  doytsch: %s\n", &text[i + 1]);

                 i += text[i] + 1;

                 av_log (s, AV_LOG_DEBUG, "  fronsay: %s\n", &text[i + 1]);

             }
 #endif
             break;
 
         case AUDI_TAG:
             /* send out audio chunk */

             ret= av_get_packet(pb, pkt, size);

             pkt->stream_index = wc3->audio_stream_index;
             pkt->pts = wc3->pts;
 
             /* time to advance pts */

             wc3->pts++;

 
             packet_read = 1;
             break;
 
         default:

             av_log (s, AV_LOG_ERROR, "  unrecognized WC3 chunk: %c%c%c%c (0x%02X%02X%02X%02X)\n",

                 (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24),
                 (uint8_t)fourcc_tag, (uint8_t)(fourcc_tag >> 8), (uint8_t)(fourcc_tag >> 16), (uint8_t)(fourcc_tag >> 24));

             ret = AVERROR_INVALIDDATA;
             packet_read = 1;
             break;
         }
     }
 
     return ret;
 }
 
 static int wc3_read_close(AVFormatContext *s)
 {

     Wc3DemuxContext *wc3 = s->priv_data;

     if (wc3->vpkt.size > 0)
         av_free_packet(&wc3->vpkt);

 
     return 0;
 }
 

 AVInputFormat ff_wc3_demuxer = {

     .name           = "wc3movie",

     .long_name      = NULL_IF_CONFIG_SMALL("Wing Commander III movie"),

     .priv_data_size = sizeof(Wc3DemuxContext),
     .read_probe     = wc3_probe,
     .read_header    = wc3_read_header,
     .read_packet    = wc3_read_packet,
     .read_close     = wc3_read_close,

 };