/* Electronic Arts Multimedia File Demuxer
  * Copyright (c) 2004  The ffmpeg Project

  * Copyright (c) 2006-2008 Peter Ross

  *

  * 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

  * Electronic Arts Multimedia file demuxer (WVE/UV2/etc.)
  * by Robin Kay (komadori at gekkou.co.uk)
  */
 

 #include "libavutil/intreadwrite.h"

 #include "avformat.h"
 
 #define SCHl_TAG MKTAG('S', 'C', 'H', 'l')

 #define SEAD_TAG MKTAG('S', 'E', 'A', 'D')    /* Sxxx header */
 #define SNDC_TAG MKTAG('S', 'N', 'D', 'C')    /* Sxxx data */
 #define SEND_TAG MKTAG('S', 'E', 'N', 'D')    /* Sxxx end */

 #define SHEN_TAG MKTAG('S', 'H', 'E', 'N')    /* SxEN header */
 #define SDEN_TAG MKTAG('S', 'D', 'E', 'N')    /* SxEN data */
 #define SEEN_TAG MKTAG('S', 'E', 'E', 'N')    /* SxEN end */

 #define ISNh_TAG MKTAG('1', 'S', 'N', 'h')    /* 1SNx header */

 #define EACS_TAG MKTAG('E', 'A', 'C', 'S')

 #define ISNd_TAG MKTAG('1', 'S', 'N', 'd')    /* 1SNx data */
 #define ISNe_TAG MKTAG('1', 'S', 'N', 'e')    /* 1SNx end */

 #define PT00_TAG MKTAG('P', 'T', 0x0, 0x0)

 #define GSTR_TAG MKTAG('G', 'S', 'T', 'R')

 #define SCDl_TAG MKTAG('S', 'C', 'D', 'l')
 #define SCEl_TAG MKTAG('S', 'C', 'E', 'l')

 #define kVGT_TAG MKTAG('k', 'V', 'G', 'T')    /* TGV i-frame */

 #define fVGT_TAG MKTAG('f', 'V', 'G', 'T')    /* TGV p-frame */

 #define mTCD_TAG MKTAG('m', 'T', 'C', 'D')    /* MDEC */

 #define MADk_TAG MKTAG('M', 'A', 'D', 'k')    /* MAD i-frame */

 #define MADm_TAG MKTAG('M', 'A', 'D', 'm')    /* MAD p-frame */
 #define MADe_TAG MKTAG('M', 'A', 'D', 'e')    /* MAD lqp-frame */

 #define MPCh_TAG MKTAG('M', 'P', 'C', 'h')    /* MPEG2 */

 #define TGQs_TAG MKTAG('T', 'G', 'Q', 's')    /* TGQ i-frame (appears in .TGQ files) */
 #define pQGT_TAG MKTAG('p', 'Q', 'G', 'T')    /* TGQ i-frame (appears in .UV files) */

 #define pIQT_TAG MKTAG('p', 'I', 'Q', 'T')    /* TQI/UV2 i-frame (.UV2/.WVE) */

 #define MVhd_TAG MKTAG('M', 'V', 'h', 'd')
 #define MV0K_TAG MKTAG('M', 'V', '0', 'K')
 #define MV0F_TAG MKTAG('M', 'V', '0', 'F')

 #define MVIh_TAG MKTAG('M', 'V', 'I', 'h')    /* CMV header */

 #define MVIf_TAG MKTAG('M', 'V', 'I', 'f')    /* CMV i-frame */

 
 typedef struct EaDemuxContext {

     int big_endian;
 

     enum CodecID video_codec;

     AVRational time_base;

     int width, height;

     int video_stream_index;
 

     enum CodecID audio_codec;

     int audio_stream_index;
     int audio_frame_counter;
 

     int bytes;

     int sample_rate;

     int num_channels;
     int num_samples;
 } EaDemuxContext;
 

 static uint32_t read_arbitary(AVIOContext *pb) {

     uint8_t size, byte;
     int i;
     uint32_t word;
 

     size = avio_r8(pb);

 
     word = 0;
     for (i = 0; i < size; i++) {

         byte = avio_r8(pb);

         word <<= 8;
         word |= byte;
     }
 
     return word;
 }
 
 /*

  * Process PT/GSTR sound header
  * return 1 if success, 0 if invalid format, otherwise AVERROR_xxx

  */

 static int process_audio_header_elements(AVFormatContext *s)
 {

     int inHeader = 1;

     EaDemuxContext *ea = s->priv_data;

     AVIOContext *pb = s->pb;

     int compression_type = -1, revision = -1, revision2 = -1;

     ea->bytes = 2;

     ea->sample_rate = -1;

     ea->num_channels = 1;
 

     while (!url_feof(pb) && inHeader) {

         int inSubheader;
         uint8_t byte;

         byte = avio_r8(pb);

 
         switch (byte) {
         case 0xFD:

             av_log (s, AV_LOG_DEBUG, "entered audio subheader\n");

             inSubheader = 1;

             while (!url_feof(pb) && inSubheader) {

                 uint8_t subbyte;

                 subbyte = avio_r8(pb);

 
                 switch (subbyte) {

                 case 0x80:
                     revision = read_arbitary(pb);

                     av_log (s, AV_LOG_DEBUG, "revision (element 0x80) set to 0x%08x\n", revision);

                     break;

                 case 0x82:
                     ea->num_channels = read_arbitary(pb);

                     av_log (s, AV_LOG_DEBUG, "num_channels (element 0x82) set to 0x%08x\n", ea->num_channels);

                     break;
                 case 0x83:

                     compression_type = read_arbitary(pb);

                     av_log (s, AV_LOG_DEBUG, "compression_type (element 0x83) set to 0x%08x\n", compression_type);

                     break;

                 case 0x84:
                     ea->sample_rate = read_arbitary(pb);

                     av_log (s, AV_LOG_DEBUG, "sample_rate (element 0x84) set to %i\n", ea->sample_rate);

                     break;

                 case 0x85:
                     ea->num_samples = read_arbitary(pb);

                     av_log (s, AV_LOG_DEBUG, "num_samples (element 0x85) set to 0x%08x\n", ea->num_samples);

                     break;
                 case 0x8A:

                     av_log (s, AV_LOG_DEBUG, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));
                     av_log (s, AV_LOG_DEBUG, "exited audio subheader\n");

                     inSubheader = 0;
                     break;

                 case 0xA0:
                     revision2 = read_arbitary(pb);

                     av_log (s, AV_LOG_DEBUG, "revision2 (element 0xA0) set to 0x%08x\n", revision2);

                     break;

                 case 0xFF:

                     av_log (s, AV_LOG_DEBUG, "end of header block reached (within audio subheader)\n");

                     inSubheader = 0;
                     inHeader = 0;
                     break;

                 default:

                     av_log (s, AV_LOG_DEBUG, "element 0x%02x set to 0x%08x\n", subbyte, read_arbitary(pb));

                     break;
                 }
             }
             break;
         case 0xFF:

             av_log (s, AV_LOG_DEBUG, "end of header block reached\n");

             inHeader = 0;
             break;
         default:

             av_log (s, AV_LOG_DEBUG, "header element 0x%02x set to 0x%08x\n", byte, read_arbitary(pb));

             break;
         }
     }
 

     switch (compression_type) {

     case  0: ea->audio_codec = CODEC_ID_PCM_S16LE; break;

     case  7: ea->audio_codec = CODEC_ID_ADPCM_EA; break;

     case -1:
         switch (revision) {
         case  1: ea->audio_codec = CODEC_ID_ADPCM_EA_R1; break;
         case  2: ea->audio_codec = CODEC_ID_ADPCM_EA_R2; break;
         case  3: ea->audio_codec = CODEC_ID_ADPCM_EA_R3; break;

         case -1: break;

         default:
             av_log(s, AV_LOG_ERROR, "unsupported stream type; revision=%i\n", revision);
             return 0;
         }

         switch (revision2) {
         case  8: ea->audio_codec = CODEC_ID_PCM_S16LE_PLANAR; break;

         case 10: ea->audio_codec = CODEC_ID_ADPCM_EA_R2; break;

         case 16: ea->audio_codec = CODEC_ID_MP3; break;

         case -1: break;

         default:

             ea->audio_codec = CODEC_ID_NONE;

             av_log(s, AV_LOG_ERROR, "unsupported stream type; revision2=%i\n", revision2);
             return 0;
         }

         break;

     default:
         av_log(s, AV_LOG_ERROR, "unsupported stream type; compression_type=%i\n", compression_type);
         return 0;
     }

     if (ea->sample_rate == -1)
         ea->sample_rate = revision==3 ? 48000 : 22050;
 

     return 1;
 }
 

 /*
  * Process EACS sound header
  * return 1 if success, 0 if invalid format, otherwise AVERROR_xxx
  */
 static int process_audio_header_eacs(AVFormatContext *s)
 {
     EaDemuxContext *ea = s->priv_data;

     AVIOContext *pb = s->pb;

     int compression_type;
 

     ea->sample_rate  = ea->big_endian ? avio_rb32(pb) : avio_rl32(pb);
     ea->bytes        = avio_r8(pb);   /* 1=8-bit, 2=16-bit */
     ea->num_channels = avio_r8(pb);
     compression_type = avio_r8(pb);

     avio_skip(pb, 13);

 
     switch (compression_type) {
     case 0:
         switch (ea->bytes) {
         case 1: ea->audio_codec = CODEC_ID_PCM_S8;    break;
         case 2: ea->audio_codec = CODEC_ID_PCM_S16LE; break;
         }
         break;
     case 1: ea->audio_codec = CODEC_ID_PCM_MULAW; ea->bytes = 1; break;

     case 2: ea->audio_codec = CODEC_ID_ADPCM_IMA_EA_EACS; break;

     default:
         av_log (s, AV_LOG_ERROR, "unsupported stream type; audio compression_type=%i\n", compression_type);
     }
 
     return 1;
 }
 

 /*
  * Process SEAD sound header
  * return 1 if success, 0 if invalid format, otherwise AVERROR_xxx
  */
 static int process_audio_header_sead(AVFormatContext *s)
 {
     EaDemuxContext *ea = s->priv_data;

     AVIOContext *pb = s->pb;

     ea->sample_rate  = avio_rl32(pb);
     ea->bytes        = avio_rl32(pb);  /* 1=8-bit, 2=16-bit */
     ea->num_channels = avio_rl32(pb);

     ea->audio_codec  = CODEC_ID_ADPCM_IMA_EA_SEAD;
 
     return 1;
 }
 

 static int process_video_header_mdec(AVFormatContext *s)
 {
     EaDemuxContext *ea = s->priv_data;

     AVIOContext *pb = s->pb;

     avio_skip(pb, 4);

     ea->width  = avio_rl16(pb);
     ea->height = avio_rl16(pb);

     ea->time_base = (AVRational){1,15};
     ea->video_codec = CODEC_ID_MDEC;
     return 1;
 }
 

 static int process_video_header_vp6(AVFormatContext *s)
 {
     EaDemuxContext *ea = s->priv_data;

     AVIOContext *pb = s->pb;

     avio_skip(pb, 16);

     ea->time_base.den = avio_rl32(pb);
     ea->time_base.num = avio_rl32(pb);

     ea->video_codec = CODEC_ID_VP6;

 
     return 1;
 }
 

 /*
  * Process EA file header
  * Returns 1 if the EA file is valid and successfully opened, 0 otherwise
  */
 static int process_ea_header(AVFormatContext *s) {
     uint32_t blockid, size = 0;
     EaDemuxContext *ea = s->priv_data;

     AVIOContext *pb = s->pb;

     int i;
 
     for (i=0; i<5 && (!ea->audio_codec || !ea->video_codec); i++) {

         unsigned int startpos = avio_tell(pb);

         int err = 0;

         blockid = avio_rl32(pb);
         size = avio_rl32(pb);

         if (i == 0)
             ea->big_endian = size > 0x000FFFFF;
         if (ea->big_endian)

             size = av_bswap32(size);

 
         switch (blockid) {

             case ISNh_TAG:

                 if (avio_rl32(pb) != EACS_TAG) {

                     av_log (s, AV_LOG_ERROR, "unknown 1SNh headerid\n");
                     return 0;
                 }
                 err = process_audio_header_eacs(s);
                 break;
 

             case SCHl_TAG :

             case SHEN_TAG :

                 blockid = avio_rl32(pb);

                 if (blockid == GSTR_TAG) {

                     avio_skip(pb, 4);

                 } else if ((blockid & 0xFFFF)!=PT00_TAG) {

                     av_log (s, AV_LOG_ERROR, "unknown SCHl headerid\n");
                     return 0;
                 }

                 err = process_audio_header_elements(s);

                 break;
 

             case SEAD_TAG:
                 err = process_audio_header_sead(s);
                 break;
 

             case MVIh_TAG :
                 ea->video_codec = CODEC_ID_CMV;
                 break;
 

             case kVGT_TAG:
                 ea->video_codec = CODEC_ID_TGV;
                 break;
 

             case mTCD_TAG :
                 err = process_video_header_mdec(s);
                 break;
 

             case MPCh_TAG:
                 ea->video_codec = CODEC_ID_MPEG2VIDEO;
                 break;
 

             case pQGT_TAG:
             case TGQs_TAG:
                 ea->video_codec = CODEC_ID_TGQ;
                 break;
 

             case pIQT_TAG:
                 ea->video_codec = CODEC_ID_TQI;
                 break;
 

             case MADk_TAG :
                 ea->video_codec = CODEC_ID_MAD;
                 break;
 

             case MVhd_TAG :

                 err = process_video_header_vp6(s);

                 break;
         }
 

         if (err < 0) {
             av_log(s, AV_LOG_ERROR, "error parsing header: %i\n", err);
             return err;
         }
 

         avio_seek(pb, startpos + size, SEEK_SET);

     }

     avio_seek(pb, 0, SEEK_SET);

 
     return 1;
 }
 
 
 static int ea_probe(AVProbeData *p)
 {

     switch (AV_RL32(&p->buf[0])) {

     case ISNh_TAG:

     case SCHl_TAG:

     case SEAD_TAG:

     case SHEN_TAG:

     case kVGT_TAG:
     case MADk_TAG:
     case MPCh_TAG:

     case MVhd_TAG:

     case MVIh_TAG:

         break;
     default:
         return 0;

     }

     if (AV_RL32(&p->buf[4]) > 0xfffff && AV_RB32(&p->buf[4]) > 0xfffff)
         return 0;
     return AVPROBE_SCORE_MAX;

 }
 
 static int ea_read_header(AVFormatContext *s,
                           AVFormatParameters *ap)
 {

     EaDemuxContext *ea = s->priv_data;

     AVStream *st;
 
     if (!process_ea_header(s))

         return AVERROR(EIO);

     if (ea->video_codec) {

         /* initialize the video decoder stream */
         st = av_new_stream(s, 0);
         if (!st)
             return AVERROR(ENOMEM);
         ea->video_stream_index = st->index;

         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

         st->codec->codec_id = ea->video_codec;

         // parsing is necessary to make FFmpeg generate correct timestamps
         if (st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
             st->need_parsing = AVSTREAM_PARSE_HEADERS;

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

         if (ea->time_base.num)
             av_set_pts_info(st, 64, ea->time_base.num, ea->time_base.den);

         st->codec->width = ea->width;
         st->codec->height = ea->height;

     }

     if (ea->audio_codec) {

         if (ea->num_channels <= 0) {
             av_log(s, AV_LOG_WARNING, "Unsupported number of channels: %d\n", ea->num_channels);
             ea->audio_codec = 0;
             return 1;
         }
         if (ea->sample_rate <= 0) {
             av_log(s, AV_LOG_ERROR, "Unsupported sample rate: %d\n", ea->sample_rate);
             ea->audio_codec = 0;
             return 1;
         }
 

         /* initialize the audio decoder stream */
         st = av_new_stream(s, 0);
         if (!st)
             return AVERROR(ENOMEM);
         av_set_pts_info(st, 33, 1, ea->sample_rate);

         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;

         st->codec->codec_id = ea->audio_codec;
         st->codec->codec_tag = 0;  /* no tag */
         st->codec->channels = ea->num_channels;
         st->codec->sample_rate = ea->sample_rate;

         st->codec->bits_per_coded_sample = ea->bytes * 8;

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

             st->codec->bits_per_coded_sample / 4;
         st->codec->block_align = st->codec->channels*st->codec->bits_per_coded_sample;

         ea->audio_stream_index = st->index;
         ea->audio_frame_counter = 0;

     }

 
     return 1;
 }
 
 static int ea_read_packet(AVFormatContext *s,
                           AVPacket *pkt)
 {
     EaDemuxContext *ea = s->priv_data;

     AVIOContext *pb = s->pb;

     int ret = 0;
     int packet_read = 0;
     unsigned int chunk_type, chunk_size;

     int key = 0;

     int av_uninit(num_samples);

 
     while (!packet_read) {

         chunk_type = avio_rl32(pb);
         chunk_size = (ea->big_endian ? avio_rb32(pb) : avio_rl32(pb)) - 8;

 
         switch (chunk_type) {
         /* audio data */

         case ISNh_TAG:

             /* header chunk also contains data; skip over the header portion*/

             avio_skip(pb, 32);

             chunk_size -= 32;

         case ISNd_TAG:

         case SCDl_TAG:

         case SNDC_TAG:

         case SDEN_TAG:

             if (!ea->audio_codec) {

                 avio_skip(pb, chunk_size);

                 break;

             } else if (ea->audio_codec == CODEC_ID_PCM_S16LE_PLANAR ||
                        ea->audio_codec == CODEC_ID_MP3) {

                 num_samples = avio_rl32(pb);

                 avio_skip(pb, 8);

                 chunk_size -= 12;

             }

             ret = av_get_packet(pb, pkt, chunk_size);

             if (ret < 0)
                 return ret;

             pkt->stream_index = ea->audio_stream_index;
             pkt->pts = 90000;
             pkt->pts *= ea->audio_frame_counter;
             pkt->pts /= ea->sample_rate;
 
             switch (ea->audio_codec) {
             case CODEC_ID_ADPCM_EA:
                 /* 2 samples/byte, 1 or 2 samples per frame depending
                  * on stereo; chunk also has 12-byte header */
                 ea->audio_frame_counter += ((chunk_size - 12) * 2) /
                     ea->num_channels;
                 break;
             case CODEC_ID_PCM_S16LE_PLANAR:
             case CODEC_ID_MP3:
                 ea->audio_frame_counter += num_samples;
                 break;
             default:
                 ea->audio_frame_counter += chunk_size /
                     (ea->bytes * ea->num_channels);
             }

 
             packet_read = 1;
             break;
 
         /* ending tag */

         case 0:

         case ISNe_TAG:

         case SCEl_TAG:

         case SEND_TAG:

         case SEEN_TAG:

             ret = AVERROR(EIO);

             packet_read = 1;
             break;
 

         case MVIh_TAG:

         case kVGT_TAG:

         case pQGT_TAG:
         case TGQs_TAG:

         case MADk_TAG:

             key = AV_PKT_FLAG_KEY;

         case MVIf_TAG:

         case fVGT_TAG:

         case MADm_TAG:
         case MADe_TAG:

             avio_seek(pb, -8, SEEK_CUR);     // include chunk preamble

             chunk_size += 8;
             goto get_video_packet;
 

         case mTCD_TAG:

             avio_skip(pb, 8);  // skip ea dct header

             chunk_size -= 8;
             goto get_video_packet;
 

         case MV0K_TAG:

         case MPCh_TAG:

         case pIQT_TAG:

             key = AV_PKT_FLAG_KEY;

         case MV0F_TAG:

 get_video_packet:

             ret = av_get_packet(pb, pkt, chunk_size);

             if (ret < 0)
                 return ret;

             pkt->stream_index = ea->video_stream_index;
             pkt->flags |= key;

             packet_read = 1;
             break;
 

         default:

             avio_skip(pb, chunk_size);

             break;
         }
     }
 
     return ret;
 }
 

 AVInputFormat ff_ea_demuxer = {

     "ea",

     NULL_IF_CONFIG_SMALL("Electronic Arts Multimedia Format"),

     sizeof(EaDemuxContext),
     ea_probe,
     ea_read_header,
     ea_read_packet,
 };