LCOV - code coverage report
Current view: top level - libavformat - segafilm.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 109 161 67.7 %
Date: 2017-12-17 04:34:43 Functions: 4 5 80.0 %

          Line data    Source code
       1             : /*
       2             :  * Sega FILM Format (CPK) Demuxer
       3             :  * Copyright (c) 2003 The FFmpeg project
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : /**
      23             :  * @file
      24             :  * Sega FILM (.cpk) file demuxer
      25             :  * by Mike Melanson (melanson@pcisys.net)
      26             :  * For more information regarding the Sega FILM file format, visit:
      27             :  *   http://www.pcisys.net/~melanson/codecs/
      28             :  */
      29             : 
      30             : #include "libavutil/intreadwrite.h"
      31             : #include "avformat.h"
      32             : #include "internal.h"
      33             : #include "avio_internal.h"
      34             : 
      35             : #define FILM_TAG MKBETAG('F', 'I', 'L', 'M')
      36             : #define FDSC_TAG MKBETAG('F', 'D', 'S', 'C')
      37             : #define STAB_TAG MKBETAG('S', 'T', 'A', 'B')
      38             : #define CVID_TAG MKBETAG('c', 'v', 'i', 'd')
      39             : #define RAW_TAG  MKBETAG('r', 'a', 'w', ' ')
      40             : 
      41             : typedef struct film_sample {
      42             :   int stream;
      43             :   int64_t sample_offset;
      44             :   unsigned int sample_size;
      45             :   int64_t pts;
      46             :   int keyframe;
      47             : } film_sample;
      48             : 
      49             : typedef struct FilmDemuxContext {
      50             :     int video_stream_index;
      51             :     int audio_stream_index;
      52             : 
      53             :     enum AVCodecID audio_type;
      54             :     unsigned int audio_samplerate;
      55             :     unsigned int audio_bits;
      56             :     unsigned int audio_channels;
      57             : 
      58             :     enum AVCodecID video_type;
      59             :     unsigned int sample_count;
      60             :     film_sample *sample_table;
      61             :     unsigned int current_sample;
      62             : 
      63             :     unsigned int base_clock;
      64             :     unsigned int version;
      65             : } FilmDemuxContext;
      66             : 
      67        6130 : static int film_probe(AVProbeData *p)
      68             : {
      69        6130 :     if (AV_RB32(&p->buf[0]) != FILM_TAG)
      70        6129 :         return 0;
      71             : 
      72           1 :     if (AV_RB32(&p->buf[16]) != FDSC_TAG)
      73           0 :         return 0;
      74             : 
      75           1 :     return AVPROBE_SCORE_MAX;
      76             : }
      77             : 
      78           1 : static int film_read_close(AVFormatContext *s)
      79             : {
      80           1 :     FilmDemuxContext *film = s->priv_data;
      81             : 
      82           1 :     av_freep(&film->sample_table);
      83             : 
      84           1 :     return 0;
      85             : }
      86             : 
      87           1 : static int film_read_header(AVFormatContext *s)
      88             : {
      89           1 :     FilmDemuxContext *film = s->priv_data;
      90           1 :     AVIOContext *pb = s->pb;
      91             :     AVStream *st;
      92             :     unsigned char scratch[256];
      93             :     int i, ret;
      94             :     unsigned int data_offset;
      95             :     unsigned int audio_frame_counter;
      96             :     unsigned int video_frame_counter;
      97             : 
      98           1 :     film->sample_table = NULL;
      99             : 
     100             :     /* load the main FILM header */
     101           1 :     if (avio_read(pb, scratch, 16) != 16)
     102           0 :         return AVERROR(EIO);
     103           1 :     data_offset = AV_RB32(&scratch[4]);
     104           1 :     film->version = AV_RB32(&scratch[8]);
     105             : 
     106             :     /* load the FDSC chunk */
     107           1 :     if (film->version == 0) {
     108             :         /* special case for Lemmings .film files; 20-byte header */
     109           0 :         if (avio_read(pb, scratch, 20) != 20)
     110           0 :             return AVERROR(EIO);
     111             :         /* make some assumptions about the audio parameters */
     112           0 :         film->audio_type = AV_CODEC_ID_PCM_S8;
     113           0 :         film->audio_samplerate = 22050;
     114           0 :         film->audio_channels = 1;
     115           0 :         film->audio_bits = 8;
     116             :     } else {
     117             :         /* normal Saturn .cpk files; 32-byte header */
     118           1 :         if (avio_read(pb, scratch, 32) != 32)
     119           0 :             return AVERROR(EIO);
     120           1 :         film->audio_samplerate = AV_RB16(&scratch[24]);
     121           1 :         film->audio_channels = scratch[21];
     122           1 :         film->audio_bits = scratch[22];
     123           1 :         if (scratch[23] == 2 && film->audio_channels > 0)
     124           0 :             film->audio_type = AV_CODEC_ID_ADPCM_ADX;
     125           1 :         else if (film->audio_channels > 0) {
     126           1 :             if (film->audio_bits == 8)
     127           1 :                 film->audio_type = AV_CODEC_ID_PCM_S8_PLANAR;
     128           0 :             else if (film->audio_bits == 16)
     129           0 :                 film->audio_type = AV_CODEC_ID_PCM_S16BE_PLANAR;
     130             :             else
     131           0 :                 film->audio_type = AV_CODEC_ID_NONE;
     132             :         } else
     133           0 :             film->audio_type = AV_CODEC_ID_NONE;
     134             :     }
     135             : 
     136           1 :     if (AV_RB32(&scratch[0]) != FDSC_TAG)
     137           0 :         return AVERROR_INVALIDDATA;
     138             : 
     139           1 :     if (AV_RB32(&scratch[8]) == CVID_TAG) {
     140           1 :         film->video_type = AV_CODEC_ID_CINEPAK;
     141           0 :     } else if (AV_RB32(&scratch[8]) == RAW_TAG) {
     142           0 :         film->video_type = AV_CODEC_ID_RAWVIDEO;
     143             :     } else {
     144           0 :         film->video_type = AV_CODEC_ID_NONE;
     145             :     }
     146             : 
     147             :     /* initialize the decoder streams */
     148           1 :     if (film->video_type) {
     149           1 :         st = avformat_new_stream(s, NULL);
     150           1 :         if (!st)
     151           0 :             return AVERROR(ENOMEM);
     152           1 :         film->video_stream_index = st->index;
     153           1 :         st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
     154           1 :         st->codecpar->codec_id = film->video_type;
     155           1 :         st->codecpar->codec_tag = 0;  /* no fourcc */
     156           1 :         st->codecpar->width = AV_RB32(&scratch[16]);
     157           1 :         st->codecpar->height = AV_RB32(&scratch[12]);
     158             : 
     159           1 :         if (film->video_type == AV_CODEC_ID_RAWVIDEO) {
     160           0 :             if (scratch[20] == 24) {
     161           0 :                 st->codecpar->format = AV_PIX_FMT_RGB24;
     162             :             } else {
     163           0 :                 av_log(s, AV_LOG_ERROR, "raw video is using unhandled %dbpp\n", scratch[20]);
     164           0 :                 return -1;
     165             :             }
     166             :         }
     167             :     }
     168             : 
     169           1 :     if (film->audio_type) {
     170           1 :         st = avformat_new_stream(s, NULL);
     171           1 :         if (!st)
     172           0 :             return AVERROR(ENOMEM);
     173           1 :         film->audio_stream_index = st->index;
     174           1 :         st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     175           1 :         st->codecpar->codec_id = film->audio_type;
     176           1 :         st->codecpar->codec_tag = 1;
     177           1 :         st->codecpar->channels = film->audio_channels;
     178           1 :         st->codecpar->sample_rate = film->audio_samplerate;
     179             : 
     180           1 :         if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) {
     181           0 :             st->codecpar->bits_per_coded_sample = 18 * 8 / 32;
     182           0 :             st->codecpar->block_align = st->codecpar->channels * 18;
     183           0 :             st->need_parsing = AVSTREAM_PARSE_FULL;
     184             :         } else {
     185           1 :             st->codecpar->bits_per_coded_sample = film->audio_bits;
     186           3 :             st->codecpar->block_align = st->codecpar->channels *
     187           2 :                 st->codecpar->bits_per_coded_sample / 8;
     188             :         }
     189             : 
     190           2 :         st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate *
     191           1 :             st->codecpar->bits_per_coded_sample;
     192             :     }
     193             : 
     194             :     /* load the sample table */
     195           1 :     if (avio_read(pb, scratch, 16) != 16)
     196           0 :         return AVERROR(EIO);
     197           1 :     if (AV_RB32(&scratch[0]) != STAB_TAG)
     198           0 :         return AVERROR_INVALIDDATA;
     199           1 :     film->base_clock = AV_RB32(&scratch[8]);
     200           1 :     film->sample_count = AV_RB32(&scratch[12]);
     201           1 :     if(film->sample_count >= UINT_MAX / sizeof(film_sample))
     202           0 :         return -1;
     203           1 :     film->sample_table = av_malloc_array(film->sample_count, sizeof(film_sample));
     204           1 :     if (!film->sample_table)
     205           0 :         return AVERROR(ENOMEM);
     206             : 
     207           3 :     for (i = 0; i < s->nb_streams; i++) {
     208           2 :         st = s->streams[i];
     209           2 :         if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
     210           1 :             avpriv_set_pts_info(st, 33, 1, film->base_clock);
     211             :         else
     212           1 :             avpriv_set_pts_info(st, 64, 1, film->audio_samplerate);
     213             :     }
     214             : 
     215           1 :     audio_frame_counter = video_frame_counter = 0;
     216         140 :     for (i = 0; i < film->sample_count; i++) {
     217             :         /* load the next sample record and transfer it to an internal struct */
     218         139 :         if (avio_read(pb, scratch, 16) != 16) {
     219           0 :             ret = AVERROR(EIO);
     220           0 :             goto fail;
     221             :         }
     222         278 :         film->sample_table[i].sample_offset =
     223         278 :             data_offset + AV_RB32(&scratch[0]);
     224         139 :         film->sample_table[i].sample_size = AV_RB32(&scratch[4]);
     225         139 :         if (film->sample_table[i].sample_size > INT_MAX / 4) {
     226           0 :             ret = AVERROR_INVALIDDATA;
     227           0 :             goto fail;
     228             :         }
     229         139 :         if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) {
     230          29 :             film->sample_table[i].stream = film->audio_stream_index;
     231          29 :             film->sample_table[i].pts = audio_frame_counter;
     232             : 
     233          29 :             if (film->audio_type == AV_CODEC_ID_ADPCM_ADX)
     234           0 :                 audio_frame_counter += (film->sample_table[i].sample_size * 32 /
     235           0 :                     (18 * film->audio_channels));
     236          29 :             else if (film->audio_type != AV_CODEC_ID_NONE)
     237          58 :                 audio_frame_counter += (film->sample_table[i].sample_size /
     238          29 :                     (film->audio_channels * film->audio_bits / 8));
     239             :         } else {
     240         110 :             film->sample_table[i].stream = film->video_stream_index;
     241         110 :             film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF;
     242         110 :             film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1;
     243         110 :             video_frame_counter++;
     244         110 :             if (film->video_type)
     245         440 :                 av_add_index_entry(s->streams[film->video_stream_index],
     246         110 :                                    film->sample_table[i].sample_offset,
     247         110 :                                    film->sample_table[i].pts,
     248         110 :                                    film->sample_table[i].sample_size, 0,
     249         110 :                                    film->sample_table[i].keyframe);
     250             :         }
     251             :     }
     252             : 
     253           1 :     if (film->audio_type)
     254           1 :         s->streams[film->audio_stream_index]->duration = audio_frame_counter;
     255             : 
     256           1 :     if (film->video_type)
     257           1 :         s->streams[film->video_stream_index]->duration = video_frame_counter;
     258             : 
     259           1 :     film->current_sample = 0;
     260             : 
     261           1 :     return 0;
     262           0 : fail:
     263           0 :     film_read_close(s);
     264           0 :     return ret;
     265             : }
     266             : 
     267         140 : static int film_read_packet(AVFormatContext *s,
     268             :                             AVPacket *pkt)
     269             : {
     270         140 :     FilmDemuxContext *film = s->priv_data;
     271         140 :     AVIOContext *pb = s->pb;
     272             :     film_sample *sample;
     273         140 :     int ret = 0;
     274             : 
     275         140 :     if (film->current_sample >= film->sample_count)
     276           1 :         return AVERROR_EOF;
     277             : 
     278         139 :     sample = &film->sample_table[film->current_sample];
     279             : 
     280             :     /* position the stream (will probably be there anyway) */
     281         139 :     avio_seek(pb, sample->sample_offset, SEEK_SET);
     282             : 
     283         139 :     ret = av_get_packet(pb, pkt, sample->sample_size);
     284         139 :     if (ret != sample->sample_size)
     285           0 :         ret = AVERROR(EIO);
     286             : 
     287         139 :     pkt->stream_index = sample->stream;
     288         139 :     pkt->pts = sample->pts;
     289             : 
     290         139 :     film->current_sample++;
     291             : 
     292         139 :     return ret;
     293             : }
     294             : 
     295           0 : static int film_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
     296             : {
     297           0 :     FilmDemuxContext *film = s->priv_data;
     298           0 :     AVStream *st = s->streams[stream_index];
     299             :     int64_t pos;
     300           0 :     int ret = av_index_search_timestamp(st, timestamp, flags);
     301           0 :     if (ret < 0)
     302           0 :         return ret;
     303             : 
     304           0 :     pos = avio_seek(s->pb, st->index_entries[ret].pos, SEEK_SET);
     305           0 :     if (pos < 0)
     306           0 :         return pos;
     307             : 
     308           0 :     film->current_sample = ret;
     309             : 
     310           0 :     return 0;
     311             : }
     312             : 
     313             : AVInputFormat ff_segafilm_demuxer = {
     314             :     .name           = "film_cpk",
     315             :     .long_name      = NULL_IF_CONFIG_SMALL("Sega FILM / CPK"),
     316             :     .priv_data_size = sizeof(FilmDemuxContext),
     317             :     .read_probe     = film_probe,
     318             :     .read_header    = film_read_header,
     319             :     .read_packet    = film_read_packet,
     320             :     .read_close     = film_read_close,
     321             :     .read_seek      = film_read_seek,
     322             : };

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