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 CodecID audio_type;
00054     unsigned int audio_samplerate;
00055     unsigned int audio_bits;
00056     unsigned int audio_channels;
00057 
00058     enum CodecID 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                             AVFormatParameters *ap)
00081 {
00082     FilmDemuxContext *film = s->priv_data;
00083     AVIOContext *pb = s->pb;
00084     AVStream *st;
00085     unsigned char scratch[256];
00086     int i;
00087     unsigned int data_offset;
00088     unsigned int audio_frame_counter;
00089 
00090     film->sample_table = NULL;
00091     film->stereo_buffer = NULL;
00092     film->stereo_buffer_size = 0;
00093 
00094     /* load the main FILM header */
00095     if (avio_read(pb, scratch, 16) != 16)
00096         return AVERROR(EIO);
00097     data_offset = AV_RB32(&scratch[4]);
00098     film->version = AV_RB32(&scratch[8]);
00099 
00100     /* load the FDSC chunk */
00101     if (film->version == 0) {
00102         /* special case for Lemmings .film files; 20-byte header */
00103         if (avio_read(pb, scratch, 20) != 20)
00104             return AVERROR(EIO);
00105         /* make some assumptions about the audio parameters */
00106         film->audio_type = CODEC_ID_PCM_S8;
00107         film->audio_samplerate = 22050;
00108         film->audio_channels = 1;
00109         film->audio_bits = 8;
00110     } else {
00111         /* normal Saturn .cpk files; 32-byte header */
00112         if (avio_read(pb, scratch, 32) != 32)
00113             return AVERROR(EIO);
00114         film->audio_samplerate = AV_RB16(&scratch[24]);
00115         film->audio_channels = scratch[21];
00116         film->audio_bits = scratch[22];
00117         if (scratch[23] == 2)
00118             film->audio_type = CODEC_ID_ADPCM_ADX;
00119         else if (film->audio_channels > 0) {
00120             if (film->audio_bits == 8)
00121                 film->audio_type = CODEC_ID_PCM_S8;
00122             else if (film->audio_bits == 16)
00123                 film->audio_type = CODEC_ID_PCM_S16BE;
00124             else
00125                 film->audio_type = CODEC_ID_NONE;
00126         } else
00127             film->audio_type = CODEC_ID_NONE;
00128     }
00129 
00130     if (AV_RB32(&scratch[0]) != FDSC_TAG)
00131         return AVERROR_INVALIDDATA;
00132 
00133     if (AV_RB32(&scratch[8]) == CVID_TAG) {
00134         film->video_type = CODEC_ID_CINEPAK;
00135     } else if (AV_RB32(&scratch[8]) == RAW_TAG) {
00136         film->video_type = CODEC_ID_RAWVIDEO;
00137     } else {
00138         film->video_type = CODEC_ID_NONE;
00139     }
00140 
00141     /* initialize the decoder streams */
00142     if (film->video_type) {
00143         st = avformat_new_stream(s, NULL);
00144         if (!st)
00145             return AVERROR(ENOMEM);
00146         film->video_stream_index = st->index;
00147         st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00148         st->codec->codec_id = film->video_type;
00149         st->codec->codec_tag = 0;  /* no fourcc */
00150         st->codec->width = AV_RB32(&scratch[16]);
00151         st->codec->height = AV_RB32(&scratch[12]);
00152 
00153         if (film->video_type == CODEC_ID_RAWVIDEO) {
00154             if (scratch[20] == 24) {
00155                 st->codec->pix_fmt = PIX_FMT_RGB24;
00156             } else {
00157                 av_log(s, AV_LOG_ERROR, "raw video is using unhandled %dbpp\n", scratch[20]);
00158                 return -1;
00159             }
00160         }
00161     }
00162 
00163     if (film->audio_type) {
00164         st = avformat_new_stream(s, NULL);
00165         if (!st)
00166             return AVERROR(ENOMEM);
00167         film->audio_stream_index = st->index;
00168         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00169         st->codec->codec_id = film->audio_type;
00170         st->codec->codec_tag = 1;
00171         st->codec->channels = film->audio_channels;
00172         st->codec->sample_rate = film->audio_samplerate;
00173 
00174         if (film->audio_type == CODEC_ID_ADPCM_ADX) {
00175             st->codec->bits_per_coded_sample = 18 * 8 / 32;
00176             st->codec->block_align = st->codec->channels * 18;
00177             st->need_parsing = AVSTREAM_PARSE_FULL;
00178         } else {
00179             st->codec->bits_per_coded_sample = film->audio_bits;
00180             st->codec->block_align = st->codec->channels *
00181                 st->codec->bits_per_coded_sample / 8;
00182         }
00183 
00184         st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
00185             st->codec->bits_per_coded_sample;
00186     }
00187 
00188     /* load the sample table */
00189     if (avio_read(pb, scratch, 16) != 16)
00190         return AVERROR(EIO);
00191     if (AV_RB32(&scratch[0]) != STAB_TAG)
00192         return AVERROR_INVALIDDATA;
00193     film->base_clock = AV_RB32(&scratch[8]);
00194     film->sample_count = AV_RB32(&scratch[12]);
00195     if(film->sample_count >= UINT_MAX / sizeof(film_sample))
00196         return -1;
00197     film->sample_table = av_malloc(film->sample_count * sizeof(film_sample));
00198     if (!film->sample_table)
00199         return AVERROR(ENOMEM);
00200 
00201     for(i=0; i<s->nb_streams; i++)
00202         avpriv_set_pts_info(s->streams[i], 33, 1, film->base_clock);
00203 
00204     audio_frame_counter = 0;
00205     for (i = 0; i < film->sample_count; i++) {
00206         /* load the next sample record and transfer it to an internal struct */
00207         if (avio_read(pb, scratch, 16) != 16) {
00208             av_free(film->sample_table);
00209             return AVERROR(EIO);
00210         }
00211         film->sample_table[i].sample_offset =
00212             data_offset + AV_RB32(&scratch[0]);
00213         film->sample_table[i].sample_size = AV_RB32(&scratch[4]);
00214         if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) {
00215             film->sample_table[i].stream = film->audio_stream_index;
00216             film->sample_table[i].pts = audio_frame_counter;
00217             film->sample_table[i].pts *= film->base_clock;
00218             film->sample_table[i].pts /= film->audio_samplerate;
00219 
00220             if (film->audio_type == CODEC_ID_ADPCM_ADX)
00221                 audio_frame_counter += (film->sample_table[i].sample_size * 32 /
00222                     (18 * film->audio_channels));
00223             else if (film->audio_type != CODEC_ID_NONE)
00224                 audio_frame_counter += (film->sample_table[i].sample_size /
00225                     (film->audio_channels * film->audio_bits / 8));
00226         } else {
00227             film->sample_table[i].stream = film->video_stream_index;
00228             film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF;
00229             film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1;
00230         }
00231     }
00232 
00233     film->current_sample = 0;
00234 
00235     return 0;
00236 }
00237 
00238 static int film_read_packet(AVFormatContext *s,
00239                             AVPacket *pkt)
00240 {
00241     FilmDemuxContext *film = s->priv_data;
00242     AVIOContext *pb = s->pb;
00243     film_sample *sample;
00244     int ret = 0;
00245     int i;
00246     int left, right;
00247 
00248     if (film->current_sample >= film->sample_count)
00249         return AVERROR(EIO);
00250 
00251     sample = &film->sample_table[film->current_sample];
00252 
00253     /* position the stream (will probably be there anyway) */
00254     avio_seek(pb, sample->sample_offset, SEEK_SET);
00255 
00256     /* do a special song and dance when loading FILM Cinepak chunks */
00257     if ((sample->stream == film->video_stream_index) &&
00258         (film->video_type == CODEC_ID_CINEPAK)) {
00259         pkt->pos= avio_tell(pb);
00260         if (av_new_packet(pkt, sample->sample_size))
00261             return AVERROR(ENOMEM);
00262         avio_read(pb, pkt->data, sample->sample_size);
00263     } else if ((sample->stream == film->audio_stream_index) &&
00264         (film->audio_channels == 2) &&
00265         (film->audio_type != CODEC_ID_ADPCM_ADX)) {
00266         /* stereo PCM needs to be interleaved */
00267 
00268         if (ffio_limit(pb, sample->sample_size) != sample->sample_size)
00269             return AVERROR(EIO);
00270         if (av_new_packet(pkt, sample->sample_size))
00271             return AVERROR(ENOMEM);
00272 
00273         /* make sure the interleave buffer is large enough */
00274         if (sample->sample_size > film->stereo_buffer_size) {
00275             av_free(film->stereo_buffer);
00276             film->stereo_buffer_size = sample->sample_size;
00277             film->stereo_buffer = av_malloc(film->stereo_buffer_size);
00278             if (!film->stereo_buffer) {
00279                 film->stereo_buffer_size = 0;
00280                 return AVERROR(ENOMEM);
00281             }
00282         }
00283 
00284         pkt->pos= avio_tell(pb);
00285         ret = avio_read(pb, film->stereo_buffer, sample->sample_size);
00286         if (ret != sample->sample_size)
00287             ret = AVERROR(EIO);
00288 
00289         left = 0;
00290         right = sample->sample_size / 2;
00291         for (i = 0; i < sample->sample_size; ) {
00292             if (film->audio_bits == 8) {
00293                 pkt->data[i++] = film->stereo_buffer[left++];
00294                 pkt->data[i++] = film->stereo_buffer[right++];
00295             } else {
00296                 pkt->data[i++] = film->stereo_buffer[left++];
00297                 pkt->data[i++] = film->stereo_buffer[left++];
00298                 pkt->data[i++] = film->stereo_buffer[right++];
00299                 pkt->data[i++] = film->stereo_buffer[right++];
00300             }
00301         }
00302     } else {
00303         ret= av_get_packet(pb, pkt, sample->sample_size);
00304         if (ret != sample->sample_size)
00305             ret = AVERROR(EIO);
00306     }
00307 
00308     pkt->stream_index = sample->stream;
00309     pkt->pts = sample->pts;
00310 
00311     film->current_sample++;
00312 
00313     return ret;
00314 }
00315 
00316 static int film_read_close(AVFormatContext *s)
00317 {
00318     FilmDemuxContext *film = s->priv_data;
00319 
00320     av_free(film->sample_table);
00321     av_free(film->stereo_buffer);
00322 
00323     return 0;
00324 }
00325 
00326 AVInputFormat ff_segafilm_demuxer = {
00327     .name           = "film_cpk",
00328     .long_name      = NULL_IF_CONFIG_SMALL("Sega FILM/CPK format"),
00329     .priv_data_size = sizeof(FilmDemuxContext),
00330     .read_probe     = film_probe,
00331     .read_header    = film_read_header,
00332     .read_packet    = film_read_packet,
00333     .read_close     = film_read_close,
00334 };