2 * Sega FILM Format (CPK) Demuxer
3 * Copyright (c) 2003 The ffmpeg Project
5 * This file is part of FFmpeg.
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.
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.
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
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/
32 #define FILM_TAG MKBETAG('F', 'I', 'L', 'M')
33 #define FDSC_TAG MKBETAG('F', 'D', 'S', 'C')
34 #define STAB_TAG MKBETAG('S', 'T', 'A', 'B')
35 #define CVID_TAG MKBETAG('c', 'v', 'i', 'd')
39 offset_t sample_offset;
40 unsigned int sample_size;
45 typedef struct FilmDemuxContext {
46 int video_stream_index;
47 int audio_stream_index;
49 unsigned int audio_type;
50 unsigned int audio_samplerate;
51 unsigned int audio_bits;
52 unsigned int audio_channels;
54 unsigned int video_type;
55 unsigned int sample_count;
56 film_sample_t *sample_table;
57 unsigned int current_sample;
59 unsigned int base_clock;
62 /* buffer used for interleaving stereo PCM data */
63 unsigned char *stereo_buffer;
64 int stereo_buffer_size;
67 static int film_probe(AVProbeData *p)
72 if (AV_RB32(&p->buf[0]) != FILM_TAG)
75 return AVPROBE_SCORE_MAX;
78 static int film_read_header(AVFormatContext *s,
79 AVFormatParameters *ap)
81 FilmDemuxContext *film = (FilmDemuxContext *)s->priv_data;
82 ByteIOContext *pb = &s->pb;
84 unsigned char scratch[256];
86 unsigned int data_offset;
87 unsigned int audio_frame_counter;
89 film->sample_table = NULL;
90 film->stereo_buffer = NULL;
91 film->stereo_buffer_size = 0;
93 /* load the main FILM header */
94 if (get_buffer(pb, scratch, 16) != 16)
96 data_offset = AV_RB32(&scratch[4]);
97 film->version = AV_RB32(&scratch[8]);
99 /* load the FDSC chunk */
100 if (film->version == 0) {
101 /* special case for Lemmings .film files; 20-byte header */
102 if (get_buffer(pb, scratch, 20) != 20)
104 /* make some assumptions about the audio parameters */
105 film->audio_type = CODEC_ID_PCM_S8;
106 film->audio_samplerate = 22050;
107 film->audio_channels = 1;
108 film->audio_bits = 8;
110 /* normal Saturn .cpk files; 32-byte header */
111 if (get_buffer(pb, scratch, 32) != 32)
113 film->audio_samplerate = AV_RB16(&scratch[24]);;
114 film->audio_channels = scratch[21];
115 film->audio_bits = scratch[22];
116 if (film->audio_bits == 8)
117 film->audio_type = CODEC_ID_PCM_S8;
118 else if (film->audio_bits == 16)
119 film->audio_type = CODEC_ID_PCM_S16BE;
121 film->audio_type = 0;
124 if (AV_RB32(&scratch[0]) != FDSC_TAG)
125 return AVERROR_INVALIDDATA;
127 if (AV_RB32(&scratch[8]) == CVID_TAG) {
128 film->video_type = CODEC_ID_CINEPAK;
130 film->video_type = 0;
132 /* initialize the decoder streams */
133 if (film->video_type) {
134 st = av_new_stream(s, 0);
136 return AVERROR_NOMEM;
137 film->video_stream_index = st->index;
138 st->codec->codec_type = CODEC_TYPE_VIDEO;
139 st->codec->codec_id = film->video_type;
140 st->codec->codec_tag = 0; /* no fourcc */
141 st->codec->width = AV_RB32(&scratch[16]);
142 st->codec->height = AV_RB32(&scratch[12]);
145 if (film->audio_type) {
146 st = av_new_stream(s, 0);
148 return AVERROR_NOMEM;
149 film->audio_stream_index = st->index;
150 st->codec->codec_type = CODEC_TYPE_AUDIO;
151 st->codec->codec_id = film->audio_type;
152 st->codec->codec_tag = 1;
153 st->codec->channels = film->audio_channels;
154 st->codec->bits_per_sample = film->audio_bits;
155 st->codec->sample_rate = film->audio_samplerate;
156 st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
157 st->codec->bits_per_sample;
158 st->codec->block_align = st->codec->channels *
159 st->codec->bits_per_sample / 8;
162 /* load the sample table */
163 if (get_buffer(pb, scratch, 16) != 16)
165 if (AV_RB32(&scratch[0]) != STAB_TAG)
166 return AVERROR_INVALIDDATA;
167 film->base_clock = AV_RB32(&scratch[8]);
168 film->sample_count = AV_RB32(&scratch[12]);
169 if(film->sample_count >= UINT_MAX / sizeof(film_sample_t))
171 film->sample_table = av_malloc(film->sample_count * sizeof(film_sample_t));
173 for(i=0; i<s->nb_streams; i++)
174 av_set_pts_info(s->streams[i], 33, 1, film->base_clock);
176 audio_frame_counter = 0;
177 for (i = 0; i < film->sample_count; i++) {
178 /* load the next sample record and transfer it to an internal struct */
179 if (get_buffer(pb, scratch, 16) != 16) {
180 av_free(film->sample_table);
183 film->sample_table[i].sample_offset =
184 data_offset + AV_RB32(&scratch[0]);
185 film->sample_table[i].sample_size = AV_RB32(&scratch[4]);
186 if (AV_RB32(&scratch[8]) == 0xFFFFFFFF) {
187 film->sample_table[i].stream = film->audio_stream_index;
188 film->sample_table[i].pts = audio_frame_counter;
189 film->sample_table[i].pts *= film->base_clock;
190 film->sample_table[i].pts /= film->audio_samplerate;
192 audio_frame_counter += (film->sample_table[i].sample_size /
193 (film->audio_channels * film->audio_bits / 8));
195 film->sample_table[i].stream = film->video_stream_index;
196 film->sample_table[i].pts = AV_RB32(&scratch[8]) & 0x7FFFFFFF;
197 film->sample_table[i].keyframe = (scratch[8] & 0x80) ? 0 : 1;
201 film->current_sample = 0;
206 static int film_read_packet(AVFormatContext *s,
209 FilmDemuxContext *film = (FilmDemuxContext *)s->priv_data;
210 ByteIOContext *pb = &s->pb;
211 film_sample_t *sample;
216 if (film->current_sample >= film->sample_count)
219 sample = &film->sample_table[film->current_sample];
221 /* position the stream (will probably be there anyway) */
222 url_fseek(pb, sample->sample_offset, SEEK_SET);
224 /* do a special song and dance when loading FILM Cinepak chunks */
225 if ((sample->stream == film->video_stream_index) &&
226 (film->video_type == CODEC_ID_CINEPAK)) {
227 pkt->pos= url_ftell(pb);
228 if (av_new_packet(pkt, sample->sample_size))
229 return AVERROR_NOMEM;
230 get_buffer(pb, pkt->data, sample->sample_size);
231 } else if ((sample->stream == film->audio_stream_index) &&
232 (film->audio_channels == 2)) {
233 /* stereo PCM needs to be interleaved */
235 if (av_new_packet(pkt, sample->sample_size))
236 return AVERROR_NOMEM;
238 /* make sure the interleave buffer is large enough */
239 if (sample->sample_size > film->stereo_buffer_size) {
240 av_free(film->stereo_buffer);
241 film->stereo_buffer_size = sample->sample_size;
242 film->stereo_buffer = av_malloc(film->stereo_buffer_size);
245 pkt->pos= url_ftell(pb);
246 ret = get_buffer(pb, film->stereo_buffer, sample->sample_size);
247 if (ret != sample->sample_size)
251 right = sample->sample_size / 2;
252 for (i = 0; i < sample->sample_size; ) {
253 if (film->audio_bits == 8) {
254 pkt->data[i++] = film->stereo_buffer[left++];
255 pkt->data[i++] = film->stereo_buffer[right++];
257 pkt->data[i++] = film->stereo_buffer[left++];
258 pkt->data[i++] = film->stereo_buffer[left++];
259 pkt->data[i++] = film->stereo_buffer[right++];
260 pkt->data[i++] = film->stereo_buffer[right++];
264 ret= av_get_packet(pb, pkt, sample->sample_size);
265 if (ret != sample->sample_size)
269 pkt->stream_index = sample->stream;
270 pkt->pts = sample->pts;
272 film->current_sample++;
277 static int film_read_close(AVFormatContext *s)
279 FilmDemuxContext *film = (FilmDemuxContext *)s->priv_data;
281 av_free(film->sample_table);
282 av_free(film->stereo_buffer);
287 AVInputFormat segafilm_demuxer = {
289 "Sega FILM/CPK format",
290 sizeof(FilmDemuxContext),