FFmpeg: libavformat/segafilm.c Source File

00001 /*
00002  * Sega FILM Format (CPK) Demuxer
00003  * Copyright (c) 2003 The ffmpeg Project
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00030 #include "libavutil/intreadwrite.h"
00031 #include "avformat.h"
00032 #include "internal.h"
00033 #include "avio_internal.h"
00034 
00035 #define FILM_TAG MKBETAG('F', 'I', 'L', 'M')
00036 #define FDSC_TAG MKBETAG('F', 'D', 'S', 'C')
00037 #define STAB_TAG MKBETAG('S', 'T', 'A', 'B')
00038 #define CVID_TAG MKBETAG('c', 'v', 'i', 'd')
00039 #define RAW_TAG  MKBETAG('r', 'a', 'w', ' ')
00040 
00041 typedef struct {
00042   int stream;
00043   int64_t sample_offset;
00044   unsigned int sample_size;
00045   int64_t pts;
00046   int keyframe;
00047 } film_sample;
00048 
00049 typedef struct FilmDemuxContext {
00050     int video_stream_index;
00051     int audio_stream_index;
00052 
00053     enum AVCodecID audio_type;
00054     unsigned int audio_samplerate;
00055     unsigned int audio_bits;
00056     unsigned int audio_channels;
00057 
00058     enum AVCodecID video_type;
00059     unsigned int sample_count;
00060     film_sample *sample_table;
00061     unsigned int current_sample;
00062 
00063     unsigned int base_clock;
00064     unsigned int version;
00065 
00066     /* buffer used for interleaving stereo PCM data */
00067     unsigned char *stereo_buffer;
00068     int stereo_buffer_size;
00069 } FilmDemuxContext;
00070 
00071 static int film_probe(AVProbeData *p)
00072 {
00073     if (AV_RB32(&p->buf[0]) != FILM_TAG)
00074         return 0;
00075 
00076     return AVPROBE_SCORE_MAX;
00077 }
00078 
00079 static int film_read_header(AVFormatContext *s)
00080 {
00081     FilmDemuxContext *film = s->priv_data;
00082     AVIOContext *pb = s->pb;
00083     AVStream *st;
00084     unsigned char scratch[256];
00085     int i;
00086     unsigned int data_offset;
00087     unsigned int audio_frame_counter;
00088 
00089     film->sample_table = NULL;
00090     film->stereo_buffer = NULL;
00091     film->stereo_buffer_size = 0;
00092 
00093     /* load the main FILM header */
00094     if (avio_read(pb, scratch, 16) != 16)
00095         return AVERROR(EIO);
00096     data_offset = AV_RB32(&scratch[4]);
00097     film->version = AV_RB32(&scratch[8]);
00098 
00099     /* load the FDSC chunk */
00100     if (film->version == 0) {
00101         /* special case for Lemmings .film files; 20-byte header */
00102         if (avio_read(pb, scratch, 20) != 20)
00103             return AVERROR(EIO);
00104         /* make some assumptions about the audio parameters */
00105         film->audio_type = AV_CODEC_ID_PCM_S8;
00106         film->audio_samplerate = 22050;
00107         film->audio_channels = 1;
00108         film->audio_bits = 8;
00109     } else {
00110         /* normal Saturn .cpk files; 32-byte header */
00111         if (avio_read(pb, scratch, 32) != 32)
00112             return AVERROR(EIO);
00113         film->audio_samplerate = AV_RB16(&scratch[24]);
00114         film->audio_channels = scratch[21];
00115         film->audio_bits = scratch[22];
00116         if (scratch[23] == 2)
00117             film->audio_type = AV_CODEC_ID_ADPCM_ADX;
00118         else if (film->audio_channels > 0) {
00119             if (film->audio_bits == 8)
00120                 film->audio_type = AV_CODEC_ID_PCM_S8;
00121             else if (film->audio_bits == 16)
00122                 film->audio_type = AV_CODEC_ID_PCM_S16BE;
00123             else
00124                 film->audio_type = AV_CODEC_ID_NONE;
00125         } else
00126             film->audio_type = AV_CODEC_ID_NONE;
00127     }
00128 
00129     if (AV_RB32(&scratch[0]) != FDSC_TAG)
00130         return AVERROR_INVALIDDATA;
00131 
00132     if (AV_RB32(&scratch[8]) == CVID_TAG) {
00133         film->video_type = AV_CODEC_ID_CINEPAK;
00134     } else if (AV_RB32(&scratch[8]) == RAW_TAG) {
00135         film->video_type = AV_CODEC_ID_RAWVIDEO;
00136     } else {
00137         film->video_type = AV_CODEC_ID_NONE;
00138     }
00139 
00140     /* initialize the decoder streams */
00141     if (film->video_type) {
00142         st = avformat_new_stream(s, NULL);
00143         if (!st)
00144             return AVERROR(ENOMEM);
00145         film->video_stream_index = st->index;
00146         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00147         st->codec->codec_id = film->video_type;
00148         st->codec->codec_tag = 0;  /* no fourcc */
00149         st->codec->width = AV_RB32(&scratch[16]);
00150         st->codec->height = AV_RB32(&scratch[12]);
00151 
00152         if (film->video_type == AV_CODEC_ID_RAWVIDEO) {
00153             if (scratch[20] == 24) {
00154                 st->codec->pix_fmt = PIX_FMT_RGB24;
00155             } else {
00156                 av_log(s, AV_LOG_ERROR, "raw video is using unhandled %dbpp\n", scratch[20]);
00157                 return -1;
00158             }
00159         }
00160     }
00161 
00162     if (film->audio_type) {
00163         st = avformat_new_stream(s, NULL);
00164         if (!st)
00165             return AVERROR(ENOMEM);
00166         film->audio_stream_index = st->index;
00167         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00168         st->codec->codec_id = film->audio_type;
00169         st->codec->codec_tag = 1;
00170         st->codec->channels = film->audio_channels;
00171         st->codec->sample_rate = film->audio_samplerate;
00172 
00173         if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) {
00174             st->codec->bits_per_coded_sample = 18 * 8 / 32;
00175             st->codec->block_align = st->codec->channels * 18;
00176             st->need_parsing = AVSTREAM_PARSE_FULL;
00177         } else {
00178             st->codec->bits_per_coded_sample = film->audio_bits;
00179             st->codec->block_align = st->codec->channels *
00180                 st->codec->bits_per_coded_sample / 8;
00181         }
00182 
00183         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
00184             st->codec->bits_per_coded_sample;
00185     }
00186 
00187     /* load the sample table */
00188     if (avio_read(pb, scratch, 16) != 16)
00189         return AVERROR(EIO);
00190     if (AV_RB32(&scratch[0]) != STAB_TAG)
00191         return AVERROR_INVALIDDATA;
00192     film->base_clock = AV_RB32(&scratch[8]);
00193     film->sample_count = AV_RB32(&scratch[12]);
00194     if(film->sample_count >= UINT_MAX / sizeof(film_sample))
00195         return -1;
00196     film->sample_table = av_malloc(film->sample_count * sizeof(film_sample));
00197     if (!film->sample_table)
00198         return AVERROR(ENOMEM);
00199 
00200     for (i = 0; i < s->nb_streams; i++) {
00201         st = s->streams[i];
00202         if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
00203             avpriv_set_pts_info(st, 33, 1, film->base_clock);
00204         else
00205             avpriv_set_pts_info(st, 64, 1, film->audio_samplerate);
00206     }
00207 
00208     audio_frame_counter = 0;
00209     for (i = 0; i < film->sample_count; i++) {
00210         /* load the next sample record and transfer it to an internal struct */
00211         if (avio_read(pb, scratch, 16) != 16) {
00212             av_free(film->sample_table);
00213             return AVERROR(EIO);
00214         }
00215         film->sample_table[i].sample_offset =
00216             data_offset + AV_RB32(&scratch[0]);
00217         film->sample_table[i].sample_size = AV_RB32(&scratch[4]);
00218         if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) {
00219             film->sample_table[i].stream = film->audio_stream_index;
00220             film->sample_table[i].pts = audio_frame_counter;
00221 
00222             if (film->audio_type == AV_CODEC_ID_ADPCM_ADX)
00223                 audio_frame_counter += (film->sample_table[i].sample_size * 32 /
00224                     (18 * film->audio_channels));
00225             else if (film->audio_type != AV_CODEC_ID_NONE)
00226                 audio_frame_counter += (film->sample_table[i].sample_size /
00227                     (film->audio_channels * film->audio_bits / 8));
00228         } else {
00229             film->sample_table[i].stream = film->video_stream_index;
00230             film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF;
00231             film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1;
00232         }
00233     }
00234 
00235     film->current_sample = 0;
00236 
00237     return 0;
00238 }
00239 
00240 static int film_read_packet(AVFormatContext *s,
00241                             AVPacket *pkt)
00242 {
00243     FilmDemuxContext *film = s->priv_data;
00244     AVIOContext *pb = s->pb;
00245     film_sample *sample;
00246     int ret = 0;
00247     int i;
00248     int left, right;
00249 
00250     if (film->current_sample >= film->sample_count)
00251         return AVERROR(EIO);
00252 
00253     sample = &film->sample_table[film->current_sample];
00254 
00255     /* position the stream (will probably be there anyway) */
00256     avio_seek(pb, sample->sample_offset, SEEK_SET);
00257 
00258     /* do a special song and dance when loading FILM Cinepak chunks */
00259     if ((sample->stream == film->video_stream_index) &&
00260         (film->video_type == AV_CODEC_ID_CINEPAK)) {
00261         pkt->pos= avio_tell(pb);
00262         if (av_new_packet(pkt, sample->sample_size))
00263             return AVERROR(ENOMEM);
00264         avio_read(pb, pkt->data, sample->sample_size);
00265     } else if ((sample->stream == film->audio_stream_index) &&
00266         (film->audio_channels == 2) &&
00267         (film->audio_type != AV_CODEC_ID_ADPCM_ADX)) {
00268         /* stereo PCM needs to be interleaved */
00269 
00270         if (ffio_limit(pb, sample->sample_size) != sample->sample_size)
00271             return AVERROR(EIO);
00272         if (av_new_packet(pkt, sample->sample_size))
00273             return AVERROR(ENOMEM);
00274 
00275         /* make sure the interleave buffer is large enough */
00276         if (sample->sample_size > film->stereo_buffer_size) {
00277             av_free(film->stereo_buffer);
00278             film->stereo_buffer_size = sample->sample_size;
00279             film->stereo_buffer = av_malloc(film->stereo_buffer_size);
00280             if (!film->stereo_buffer) {
00281                 film->stereo_buffer_size = 0;
00282                 return AVERROR(ENOMEM);
00283             }
00284         }
00285 
00286         pkt->pos= avio_tell(pb);
00287         ret = avio_read(pb, film->stereo_buffer, sample->sample_size);
00288         if (ret != sample->sample_size)
00289             ret = AVERROR(EIO);
00290 
00291         left = 0;
00292         right = sample->sample_size / 2;
00293         for (i = 0; i + 1 + 2*(film->audio_bits != 8) < sample->sample_size; ) {
00294             if (film->audio_bits == 8) {
00295                 pkt->data[i++] = film->stereo_buffer[left++];
00296                 pkt->data[i++] = film->stereo_buffer[right++];
00297             } else {
00298                 pkt->data[i++] = film->stereo_buffer[left++];
00299                 pkt->data[i++] = film->stereo_buffer[left++];
00300                 pkt->data[i++] = film->stereo_buffer[right++];
00301                 pkt->data[i++] = film->stereo_buffer[right++];
00302             }
00303         }
00304     } else {
00305         ret= av_get_packet(pb, pkt, sample->sample_size);
00306         if (ret != sample->sample_size)
00307             ret = AVERROR(EIO);
00308     }
00309 
00310     pkt->stream_index = sample->stream;
00311     pkt->pts = sample->pts;
00312 
00313     film->current_sample++;
00314 
00315     return ret;
00316 }
00317 
00318 static int film_read_close(AVFormatContext *s)
00319 {
00320     FilmDemuxContext *film = s->priv_data;
00321 
00322     av_free(film->sample_table);
00323     av_free(film->stereo_buffer);
00324 
00325     return 0;
00326 }
00327 
00328 AVInputFormat ff_segafilm_demuxer = {
00329     .name           = "film_cpk",
00330     .long_name      = NULL_IF_CONFIG_SMALL("Sega FILM / CPK"),
00331     .priv_data_size = sizeof(FilmDemuxContext),
00332     .read_probe     = film_probe,
00333     .read_header    = film_read_header,
00334     .read_packet    = film_read_packet,
00335     .read_close     = film_read_close,
00336 };