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path: root/libavformat/segafilm.c (plain)
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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
41typedef 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
49typedef 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
67static 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
78static 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
87static 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 unsigned int video_frame_counter;
97
98 film->sample_table = NULL;
99
100 /* load the main FILM header */
101 if (avio_read(pb, scratch, 16) != 16)
102 return AVERROR(EIO);
103 data_offset = AV_RB32(&scratch[4]);
104 film->version = AV_RB32(&scratch[8]);
105
106 /* load the FDSC chunk */
107 if (film->version == 0) {
108 /* special case for Lemmings .film files; 20-byte header */
109 if (avio_read(pb, scratch, 20) != 20)
110 return AVERROR(EIO);
111 /* make some assumptions about the audio parameters */
112 film->audio_type = AV_CODEC_ID_PCM_S8;
113 film->audio_samplerate = 22050;
114 film->audio_channels = 1;
115 film->audio_bits = 8;
116 } else {
117 /* normal Saturn .cpk files; 32-byte header */
118 if (avio_read(pb, scratch, 32) != 32)
119 return AVERROR(EIO);
120 film->audio_samplerate = AV_RB16(&scratch[24]);
121 film->audio_channels = scratch[21];
122 film->audio_bits = scratch[22];
123 if (scratch[23] == 2 && film->audio_channels > 0)
124 film->audio_type = AV_CODEC_ID_ADPCM_ADX;
125 else if (film->audio_channels > 0) {
126 if (film->audio_bits == 8)
127 film->audio_type = AV_CODEC_ID_PCM_S8_PLANAR;
128 else if (film->audio_bits == 16)
129 film->audio_type = AV_CODEC_ID_PCM_S16BE_PLANAR;
130 else
131 film->audio_type = AV_CODEC_ID_NONE;
132 } else
133 film->audio_type = AV_CODEC_ID_NONE;
134 }
135
136 if (AV_RB32(&scratch[0]) != FDSC_TAG)
137 return AVERROR_INVALIDDATA;
138
139 if (AV_RB32(&scratch[8]) == CVID_TAG) {
140 film->video_type = AV_CODEC_ID_CINEPAK;
141 } else if (AV_RB32(&scratch[8]) == RAW_TAG) {
142 film->video_type = AV_CODEC_ID_RAWVIDEO;
143 } else {
144 film->video_type = AV_CODEC_ID_NONE;
145 }
146
147 /* initialize the decoder streams */
148 if (film->video_type) {
149 st = avformat_new_stream(s, NULL);
150 if (!st)
151 return AVERROR(ENOMEM);
152 film->video_stream_index = st->index;
153 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
154 st->codecpar->codec_id = film->video_type;
155 st->codecpar->codec_tag = 0; /* no fourcc */
156 st->codecpar->width = AV_RB32(&scratch[16]);
157 st->codecpar->height = AV_RB32(&scratch[12]);
158
159 if (film->video_type == AV_CODEC_ID_RAWVIDEO) {
160 if (scratch[20] == 24) {
161 st->codecpar->format = AV_PIX_FMT_RGB24;
162 } else {
163 av_log(s, AV_LOG_ERROR, "raw video is using unhandled %dbpp\n", scratch[20]);
164 return -1;
165 }
166 }
167 }
168
169 if (film->audio_type) {
170 st = avformat_new_stream(s, NULL);
171 if (!st)
172 return AVERROR(ENOMEM);
173 film->audio_stream_index = st->index;
174 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
175 st->codecpar->codec_id = film->audio_type;
176 st->codecpar->codec_tag = 1;
177 st->codecpar->channels = film->audio_channels;
178 st->codecpar->sample_rate = film->audio_samplerate;
179
180 if (film->audio_type == AV_CODEC_ID_ADPCM_ADX) {
181 st->codecpar->bits_per_coded_sample = 18 * 8 / 32;
182 st->codecpar->block_align = st->codecpar->channels * 18;
183 st->need_parsing = AVSTREAM_PARSE_FULL;
184 } else {
185 st->codecpar->bits_per_coded_sample = film->audio_bits;
186 st->codecpar->block_align = st->codecpar->channels *
187 st->codecpar->bits_per_coded_sample / 8;
188 }
189
190 st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate *
191 st->codecpar->bits_per_coded_sample;
192 }
193
194 /* load the sample table */
195 if (avio_read(pb, scratch, 16) != 16)
196 return AVERROR(EIO);
197 if (AV_RB32(&scratch[0]) != STAB_TAG)
198 return AVERROR_INVALIDDATA;
199 film->base_clock = AV_RB32(&scratch[8]);
200 film->sample_count = AV_RB32(&scratch[12]);
201 if(film->sample_count >= UINT_MAX / sizeof(film_sample))
202 return -1;
203 film->sample_table = av_malloc_array(film->sample_count, sizeof(film_sample));
204 if (!film->sample_table)
205 return AVERROR(ENOMEM);
206
207 for (i = 0; i < s->nb_streams; i++) {
208 st = s->streams[i];
209 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
210 avpriv_set_pts_info(st, 33, 1, film->base_clock);
211 else
212 avpriv_set_pts_info(st, 64, 1, film->audio_samplerate);
213 }
214
215 audio_frame_counter = video_frame_counter = 0;
216 for (i = 0; i < film->sample_count; i++) {
217 /* load the next sample record and transfer it to an internal struct */
218 if (avio_read(pb, scratch, 16) != 16) {
219 ret = AVERROR(EIO);
220 goto fail;
221 }
222 film->sample_table[i].sample_offset =
223 data_offset + AV_RB32(&scratch[0]);
224 film->sample_table[i].sample_size = AV_RB32(&scratch[4]);
225 if (film->sample_table[i].sample_size > INT_MAX / 4) {
226 ret = AVERROR_INVALIDDATA;
227 goto fail;
228 }
229 if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) {
230 film->sample_table[i].stream = film->audio_stream_index;
231 film->sample_table[i].pts = audio_frame_counter;
232
233 if (film->audio_type == AV_CODEC_ID_ADPCM_ADX)
234 audio_frame_counter += (film->sample_table[i].sample_size * 32 /
235 (18 * film->audio_channels));
236 else if (film->audio_type != AV_CODEC_ID_NONE)
237 audio_frame_counter += (film->sample_table[i].sample_size /
238 (film->audio_channels * film->audio_bits / 8));
239 } else {
240 film->sample_table[i].stream = film->video_stream_index;
241 film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF;
242 film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1;
243 video_frame_counter++;
244 if (film->video_type)
245 av_add_index_entry(s->streams[film->video_stream_index],
246 film->sample_table[i].sample_offset,
247 film->sample_table[i].pts,
248 film->sample_table[i].sample_size, 0,
249 film->sample_table[i].keyframe);
250 }
251 }
252
253 if (film->audio_type)
254 s->streams[film->audio_stream_index]->duration = audio_frame_counter;
255
256 if (film->video_type)
257 s->streams[film->video_stream_index]->duration = video_frame_counter;
258
259 film->current_sample = 0;
260
261 return 0;
262fail:
263 film_read_close(s);
264 return ret;
265}
266
267static int film_read_packet(AVFormatContext *s,
268 AVPacket *pkt)
269{
270 FilmDemuxContext *film = s->priv_data;
271 AVIOContext *pb = s->pb;
272 film_sample *sample;
273 int ret = 0;
274
275 if (film->current_sample >= film->sample_count)
276 return AVERROR_EOF;
277
278 sample = &film->sample_table[film->current_sample];
279
280 /* position the stream (will probably be there anyway) */
281 avio_seek(pb, sample->sample_offset, SEEK_SET);
282
283 ret = av_get_packet(pb, pkt, sample->sample_size);
284 if (ret != sample->sample_size)
285 ret = AVERROR(EIO);
286
287 pkt->stream_index = sample->stream;
288 pkt->pts = sample->pts;
289
290 film->current_sample++;
291
292 return ret;
293}
294
295static int film_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
296{
297 FilmDemuxContext *film = s->priv_data;
298 AVStream *st = s->streams[stream_index];
299 int64_t pos;
300 int ret = av_index_search_timestamp(st, timestamp, flags);
301 if (ret < 0)
302 return ret;
303
304 pos = avio_seek(s->pb, st->index_entries[ret].pos, SEEK_SET);
305 if (pos < 0)
306 return pos;
307
308 film->current_sample = ret;
309
310 return 0;
311}
312
313AVInputFormat 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};
323
generated by cgit at 2024-05-17 06:32:25 (GMT)