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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 { | |
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 | static int film_probe(AVProbeData *p) | |
68 | { | |
69 | if (AV_RB32(&p->buf[0]) != FILM_TAG) | |
70 | return 0; | |
71 | ||
72 | if (AV_RB32(&p->buf[16]) != FDSC_TAG) | |
73 | return 0; | |
74 | ||
75 | return AVPROBE_SCORE_MAX; | |
76 | } | |
77 | ||
78 | static int film_read_close(AVFormatContext *s) | |
79 | { | |
80 | FilmDemuxContext *film = s->priv_data; | |
81 | ||
82 | av_freep(&film->sample_table); | |
83 | ||
84 | return 0; | |
85 | } | |
86 | ||
87 | static int film_read_header(AVFormatContext *s) | |
88 | { | |
89 | FilmDemuxContext *film = s->priv_data; | |
90 | 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 | ||
97 | film->sample_table = NULL; | |
98 | ||
99 | /* load the main FILM header */ | |
100 | if (avio_read(pb, scratch, 16) != 16) | |
101 | return AVERROR(EIO); | |
102 | data_offset = AV_RB32(&scratch[4]); | |
103 | film->version = AV_RB32(&scratch[8]); | |
104 | ||
105 | /* load the FDSC chunk */ | |
106 | if (film->version == 0) { | |
107 | /* special case for Lemmings .film files; 20-byte header */ | |
108 | if (avio_read(pb, scratch, 20) != 20) | |
109 | return AVERROR(EIO); | |
110 | /* make some assumptions about the audio parameters */ | |
111 | film->audio_type = AV_CODEC_ID_PCM_S8; | |
112 | film->audio_samplerate = 22050; | |
113 | film->audio_channels = 1; | |
114 | film->audio_bits = 8; | |
115 | } else { | |
116 | /* normal Saturn .cpk files; 32-byte header */ | |
117 | if (avio_read(pb, scratch, 32) != 32) | |
118 | return AVERROR(EIO); | |
119 | film->audio_samplerate = AV_RB16(&scratch[24]); | |
120 | film->audio_channels = scratch[21]; | |
121 | film->audio_bits = scratch[22]; | |
122 | if (scratch[23] == 2 && film->audio_channels > 0) | |
123 | film->audio_type = AV_CODEC_ID_ADPCM_ADX; | |
124 | else if (film->audio_channels > 0) { | |
125 | if (film->audio_bits == 8) | |
126 | film->audio_type = AV_CODEC_ID_PCM_S8_PLANAR; | |
127 | else if (film->audio_bits == 16) | |
128 | film->audio_type = AV_CODEC_ID_PCM_S16BE_PLANAR; | |
129 | else | |
130 | film->audio_type = AV_CODEC_ID_NONE; | |
131 | } else | |
132 | film->audio_type = AV_CODEC_ID_NONE; | |
133 | } | |
134 | ||
135 | if (AV_RB32(&scratch[0]) != FDSC_TAG) | |
136 | return AVERROR_INVALIDDATA; | |
137 | ||
138 | if (AV_RB32(&scratch[8]) == CVID_TAG) { | |
139 | film->video_type = AV_CODEC_ID_CINEPAK; | |
140 | } else if (AV_RB32(&scratch[8]) == RAW_TAG) { | |
141 | film->video_type = AV_CODEC_ID_RAWVIDEO; | |
142 | } else { | |
143 | film->video_type = AV_CODEC_ID_NONE; | |
144 | } | |
145 | ||
146 | /* initialize the decoder streams */ | |
147 | if (film->video_type) { | |
148 | st = avformat_new_stream(s, NULL); | |
149 | if (!st) | |
150 | return AVERROR(ENOMEM); | |
151 | film->video_stream_index = st->index; | |
152 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
153 | st->codec->codec_id = film->video_type; | |
154 | st->codec->codec_tag = 0; /* no fourcc */ | |
155 | st->codec->width = AV_RB32(&scratch[16]); | |
156 | st->codec->height = AV_RB32(&scratch[12]); | |
157 | ||
158 | if (film->video_type == AV_CODEC_ID_RAWVIDEO) { | |
159 | if (scratch[20] == 24) { | |
160 | st->codec->pix_fmt = AV_PIX_FMT_RGB24; | |
161 | } else { | |
162 | av_log(s, AV_LOG_ERROR, "raw video is using unhandled %dbpp\n", scratch[20]); | |
163 | return -1; | |
164 | } | |
165 | } | |
166 | } | |
167 | ||
168 | if (film->audio_type) { | |
169 | st = avformat_new_stream(s, NULL); | |
170 | if (!st) | |
171 | return AVERROR(ENOMEM); | |
172 | film->audio_stream_index = st->index; | |
173 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
174 | st->codec->codec_id = film->audio_type; | |
175 | st->codec->codec_tag = 1; | |
176 | st->codec->channels = film->audio_channels; | |
177 | st->codec->sample_rate = film->audio_samplerate; | |
178 | ||
179 | if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) { | |
180 | st->codec->bits_per_coded_sample = 18 * 8 / 32; | |
181 | st->codec->block_align = st->codec->channels * 18; | |
182 | st->need_parsing = AVSTREAM_PARSE_FULL; | |
183 | } else { | |
184 | st->codec->bits_per_coded_sample = film->audio_bits; | |
185 | st->codec->block_align = st->codec->channels * | |
186 | st->codec->bits_per_coded_sample / 8; | |
187 | } | |
188 | ||
189 | st->codec->bit_rate = st->codec->channels * st->codec->sample_rate * | |
190 | st->codec->bits_per_coded_sample; | |
191 | } | |
192 | ||
193 | /* load the sample table */ | |
194 | if (avio_read(pb, scratch, 16) != 16) | |
195 | return AVERROR(EIO); | |
196 | if (AV_RB32(&scratch[0]) != STAB_TAG) | |
197 | return AVERROR_INVALIDDATA; | |
198 | film->base_clock = AV_RB32(&scratch[8]); | |
199 | film->sample_count = AV_RB32(&scratch[12]); | |
200 | if(film->sample_count >= UINT_MAX / sizeof(film_sample)) | |
201 | return -1; | |
202 | film->sample_table = av_malloc(film->sample_count * sizeof(film_sample)); | |
203 | if (!film->sample_table) | |
204 | return AVERROR(ENOMEM); | |
205 | ||
206 | for (i = 0; i < s->nb_streams; i++) { | |
207 | st = s->streams[i]; | |
208 | if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) | |
209 | avpriv_set_pts_info(st, 33, 1, film->base_clock); | |
210 | else | |
211 | avpriv_set_pts_info(st, 64, 1, film->audio_samplerate); | |
212 | } | |
213 | ||
214 | audio_frame_counter = 0; | |
215 | for (i = 0; i < film->sample_count; i++) { | |
216 | /* load the next sample record and transfer it to an internal struct */ | |
217 | if (avio_read(pb, scratch, 16) != 16) { | |
218 | ret = AVERROR(EIO); | |
219 | goto fail; | |
220 | } | |
221 | film->sample_table[i].sample_offset = | |
222 | data_offset + AV_RB32(&scratch[0]); | |
223 | film->sample_table[i].sample_size = AV_RB32(&scratch[4]); | |
224 | if (film->sample_table[i].sample_size > INT_MAX / 4) { | |
225 | ret = AVERROR_INVALIDDATA; | |
226 | goto fail; | |
227 | } | |
228 | if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) { | |
229 | film->sample_table[i].stream = film->audio_stream_index; | |
230 | film->sample_table[i].pts = audio_frame_counter; | |
231 | ||
232 | if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) | |
233 | audio_frame_counter += (film->sample_table[i].sample_size * 32 / | |
234 | (18 * film->audio_channels)); | |
235 | else if (film->audio_type != AV_CODEC_ID_NONE) | |
236 | audio_frame_counter += (film->sample_table[i].sample_size / | |
237 | (film->audio_channels * film->audio_bits / 8)); | |
238 | } else { | |
239 | film->sample_table[i].stream = film->video_stream_index; | |
240 | film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF; | |
241 | film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1; | |
242 | } | |
243 | } | |
244 | ||
245 | film->current_sample = 0; | |
246 | ||
247 | return 0; | |
248 | fail: | |
249 | film_read_close(s); | |
250 | return ret; | |
251 | } | |
252 | ||
253 | static int film_read_packet(AVFormatContext *s, | |
254 | AVPacket *pkt) | |
255 | { | |
256 | FilmDemuxContext *film = s->priv_data; | |
257 | AVIOContext *pb = s->pb; | |
258 | film_sample *sample; | |
259 | int ret = 0; | |
260 | ||
261 | if (film->current_sample >= film->sample_count) | |
262 | return AVERROR_EOF; | |
263 | ||
264 | sample = &film->sample_table[film->current_sample]; | |
265 | ||
266 | /* position the stream (will probably be there anyway) */ | |
267 | avio_seek(pb, sample->sample_offset, SEEK_SET); | |
268 | ||
269 | ||
270 | ret= av_get_packet(pb, pkt, sample->sample_size); | |
271 | if (ret != sample->sample_size) | |
272 | ret = AVERROR(EIO); | |
273 | ||
274 | pkt->stream_index = sample->stream; | |
275 | pkt->pts = sample->pts; | |
276 | ||
277 | film->current_sample++; | |
278 | ||
279 | return ret; | |
280 | } | |
281 | ||
282 | AVInputFormat ff_segafilm_demuxer = { | |
283 | .name = "film_cpk", | |
284 | .long_name = NULL_IF_CONFIG_SMALL("Sega FILM / CPK"), | |
285 | .priv_data_size = sizeof(FilmDemuxContext), | |
286 | .read_probe = film_probe, | |
287 | .read_header = film_read_header, | |
288 | .read_packet = film_read_packet, | |
289 | .read_close = film_read_close, | |
290 | }; |