7db3e602a5d353d726dfda35baaf0a643571d270
[libav.git] / libavformat / 4xm.c
1 /*
2 * 4X Technologies .4xm File Demuxer (no muxer)
3 * Copyright (c) 2003 The ffmpeg Project
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 /**
21 * @file 4xm.c
22 * 4X Technologies file demuxer
23 * by Mike Melanson (melanson@pcisys.net)
24 * for more information on the .4xm file format, visit:
25 * http://www.pcisys.net/~melanson/codecs/
26 */
27
28 #include "avformat.h"
29
30 #define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
31 #define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
32 (((uint8_t*)(x))[2] << 16) | \
33 (((uint8_t*)(x))[1] << 8) | \
34 ((uint8_t*)(x))[0])
35
36 #define FOURCC_TAG( ch0, ch1, ch2, ch3 ) \
37 ( (long)(unsigned char)(ch0) | \
38 ( (long)(unsigned char)(ch1) << 8 ) | \
39 ( (long)(unsigned char)(ch2) << 16 ) | \
40 ( (long)(unsigned char)(ch3) << 24 ) )
41
42 #define RIFF_TAG FOURCC_TAG('R', 'I', 'F', 'F')
43 #define _4XMV_TAG FOURCC_TAG('4', 'X', 'M', 'V')
44 #define LIST_TAG FOURCC_TAG('L', 'I', 'S', 'T')
45 #define HEAD_TAG FOURCC_TAG('H', 'E', 'A', 'D')
46 #define TRK__TAG FOURCC_TAG('T', 'R', 'K', '_')
47 #define MOVI_TAG FOURCC_TAG('M', 'O', 'V', 'I')
48 #define VTRK_TAG FOURCC_TAG('V', 'T', 'R', 'K')
49 #define STRK_TAG FOURCC_TAG('S', 'T', 'R', 'K')
50 #define name_TAG FOURCC_TAG('n', 'a', 'm', 'e')
51 #define vtrk_TAG FOURCC_TAG('v', 't', 'r', 'k')
52 #define strk_TAG FOURCC_TAG('s', 't', 'r', 'k')
53 #define ifrm_TAG FOURCC_TAG('i', 'f', 'r', 'm')
54 #define pfrm_TAG FOURCC_TAG('p', 'f', 'r', 'm')
55 #define cfrm_TAG FOURCC_TAG('c', 'f', 'r', 'm')
56 #define snd__TAG FOURCC_TAG('s', 'n', 'd', '_')
57 #define _TAG FOURCC_TAG('', '', '', '')
58
59 #define vtrk_SIZE 0x44
60 #define strk_SIZE 0x28
61
62 #define GET_LIST_HEADER() \
63 fourcc_tag = get_le32(pb); \
64 size = get_le32(pb); \
65 if (fourcc_tag != LIST_TAG) \
66 return AVERROR_INVALIDDATA; \
67 fourcc_tag = get_le32(pb);
68
69 typedef struct AudioTrack {
70 int sample_rate;
71 int bits;
72 int channels;
73 int stream_index;
74 int adpcm;
75 } AudioTrack;
76
77 typedef struct FourxmDemuxContext {
78 int width;
79 int height;
80 int video_stream_index;
81 int track_count;
82 AudioTrack *tracks;
83 int selected_track;
84
85 int64_t pts;
86 int last_chunk_was_audio;
87 int last_audio_frame_count;
88 } FourxmDemuxContext;
89
90 static int fourxm_probe(AVProbeData *p)
91 {
92 if (p->buf_size < 12)
93 return 0;
94
95 if ((LE_32(&p->buf[0]) != RIFF_TAG) ||
96 (LE_32(&p->buf[8]) != _4XMV_TAG))
97 return 0;
98
99 return AVPROBE_SCORE_MAX;
100 }
101
102 static int fourxm_read_header(AVFormatContext *s,
103 AVFormatParameters *ap)
104 {
105 ByteIOContext *pb = &s->pb;
106 unsigned int fourcc_tag;
107 unsigned int size;
108 int header_size;
109 FourxmDemuxContext *fourxm = (FourxmDemuxContext *)s->priv_data;
110 unsigned char *header;
111 int i;
112 int current_track = -1;
113 AVStream *st;
114
115 fourxm->track_count = 0;
116 fourxm->tracks = NULL;
117 fourxm->selected_track = 0;
118
119 /* skip the first 3 32-bit numbers */
120 url_fseek(pb, 12, SEEK_CUR);
121
122 /* check for LIST-HEAD */
123 GET_LIST_HEADER();
124 header_size = size - 4;
125 if (fourcc_tag != HEAD_TAG)
126 return AVERROR_INVALIDDATA;
127
128 /* allocate space for the header and load the whole thing */
129 header = av_malloc(header_size);
130 if (!header)
131 return AVERROR_NOMEM;
132 if (get_buffer(pb, header, header_size) != header_size)
133 return AVERROR_IO;
134
135 /* take the lazy approach and search for any and all vtrk and strk chunks */
136 for (i = 0; i < header_size - 8; i++) {
137 fourcc_tag = LE_32(&header[i]);
138 size = LE_32(&header[i + 4]);
139
140 if (fourcc_tag == vtrk_TAG) {
141 /* check that there is enough data */
142 if (size != vtrk_SIZE) {
143 av_free(header);
144 return AVERROR_INVALIDDATA;
145 }
146 fourxm->width = LE_32(&header[i + 36]);
147 fourxm->height = LE_32(&header[i + 40]);
148 i += 8 + size;
149
150 /* allocate a new AVStream */
151 st = av_new_stream(s, 0);
152 if (!st)
153 return AVERROR_NOMEM;
154
155 fourxm->video_stream_index = st->index;
156
157 st->codec.codec_type = CODEC_TYPE_VIDEO;
158 st->codec.codec_id = CODEC_ID_4XM;
159 st->codec.codec_tag = 0; /* no fourcc */
160 st->codec.width = fourxm->width;
161 st->codec.height = fourxm->height;
162
163 } else if (fourcc_tag == strk_TAG) {
164 /* check that there is enough data */
165 if (size != strk_SIZE) {
166 av_free(header);
167 return AVERROR_INVALIDDATA;
168 }
169 current_track = LE_32(&header[i + 8]);
170 if (current_track + 1 > fourxm->track_count) {
171 fourxm->track_count = current_track + 1;
172 fourxm->tracks = av_realloc(fourxm->tracks,
173 fourxm->track_count * sizeof(AudioTrack));
174 if (!fourxm->tracks) {
175 av_free(header);
176 return AVERROR_NOMEM;
177 }
178 }
179 fourxm->tracks[current_track].adpcm = LE_32(&header[i + 12]);
180 fourxm->tracks[current_track].channels = LE_32(&header[i + 36]);
181 fourxm->tracks[current_track].sample_rate = LE_32(&header[i + 40]);
182 fourxm->tracks[current_track].bits = LE_32(&header[i + 44]);
183 printf("bps:%d\n", fourxm->tracks[current_track].bits);
184 i += 8 + size;
185
186 /* allocate a new AVStream */
187 st = av_new_stream(s, current_track);
188 if (!st)
189 return AVERROR_NOMEM;
190
191 fourxm->tracks[current_track].stream_index = st->index;
192
193 st->codec.codec_type = CODEC_TYPE_AUDIO;
194 st->codec.codec_tag = 1;
195 st->codec.channels = fourxm->tracks[current_track].channels;
196 st->codec.sample_rate = fourxm->tracks[current_track].sample_rate;
197 st->codec.bits_per_sample = fourxm->tracks[current_track].bits;
198 st->codec.bit_rate = st->codec.channels * st->codec.sample_rate *
199 st->codec.bits_per_sample;
200 st->codec.block_align = st->codec.channels * st->codec.bits_per_sample;
201 if (fourxm->tracks[current_track].adpcm)
202 st->codec.codec_id = CODEC_ID_ADPCM_4XM;
203 else if (st->codec.bits_per_sample == 8)
204 st->codec.codec_id = CODEC_ID_PCM_U8;
205 else
206 st->codec.codec_id = CODEC_ID_PCM_S16LE;
207 }
208 }
209
210 av_free(header);
211
212 /* skip over the LIST-MOVI chunk (which is where the stream should be */
213 GET_LIST_HEADER();
214 if (fourcc_tag != MOVI_TAG)
215 return AVERROR_INVALIDDATA;
216
217 /* initialize context members */
218 fourxm->pts = 0;
219 fourxm->last_chunk_was_audio = 0;
220 fourxm->last_audio_frame_count = 0;
221
222 /* set the pts reference (1 pts = 1/90000) */
223 s->pts_num = 1;
224 s->pts_den = 90000;
225
226 return 0;
227 }
228
229 static int fourxm_read_packet(AVFormatContext *s,
230 AVPacket *pkt)
231 {
232 FourxmDemuxContext *fourxm = s->priv_data;
233 ByteIOContext *pb = &s->pb;
234 unsigned int fourcc_tag;
235 unsigned int size, out_size;
236 int ret = 0;
237 int track_number;
238 int packet_read = 0;
239 unsigned char header[8];
240 int64_t pts_inc;
241
242 while (!packet_read) {
243
244 if ((ret = get_buffer(&s->pb, header, 8)) < 0)
245 return ret;
246 fourcc_tag = LE_32(&header[0]);
247 size = LE_32(&header[4]);
248 if (url_feof(pb))
249 return -EIO;
250 switch (fourcc_tag) {
251
252 case LIST_TAG:
253 /* skip the LIST-* tag and move on to the next fourcc */
254 get_le32(pb);
255 break;
256
257 case ifrm_TAG:
258 case pfrm_TAG:
259 case cfrm_TAG:{
260
261 /* bump the pts if the last data sent out was audio */
262 if (fourxm->last_chunk_was_audio) {
263 fourxm->last_chunk_was_audio = 0;
264 pts_inc = fourxm->last_audio_frame_count;
265 pts_inc *= 90000;
266 pts_inc /= fourxm->tracks[fourxm->selected_track].sample_rate;
267 fourxm->pts += pts_inc;
268 }
269
270 /* allocate 8 more bytes than 'size' to account for fourcc
271 * and size */
272 if (av_new_packet(pkt, size + 8))
273 return -EIO;
274 pkt->stream_index = fourxm->video_stream_index;
275 pkt->pts = fourxm->pts;
276 memcpy(pkt->data, header, 8);
277 ret = get_buffer(&s->pb, &pkt->data[8], size);
278
279 if (ret < 0)
280 av_free_packet(pkt);
281 else
282 packet_read = 1;
283 break;
284 }
285
286 case snd__TAG:
287 track_number = get_le32(pb);
288 out_size= get_le32(pb);
289 size-=8;
290
291 if (track_number == fourxm->selected_track) {
292 if (av_new_packet(pkt, size))
293 return -EIO;
294 pkt->stream_index =
295 fourxm->tracks[fourxm->selected_track].stream_index;
296 pkt->pts = fourxm->pts;
297 ret = get_buffer(&s->pb, pkt->data, size);
298 if (ret < 0)
299 av_free_packet(pkt);
300 else
301 packet_read = 1;
302
303 /* maintain pts info for the benefit of the video track */
304 fourxm->last_chunk_was_audio = 1;
305 fourxm->last_audio_frame_count = size /
306 ((fourxm->tracks[fourxm->selected_track].bits / 8) *
307 fourxm->tracks[fourxm->selected_track].channels);
308
309 } else {
310 url_fseek(pb, size, SEEK_CUR);
311 }
312 break;
313
314 default:
315 url_fseek(pb, size, SEEK_CUR);
316 break;
317 }
318 }
319 return ret;
320 }
321
322 static int fourxm_read_close(AVFormatContext *s)
323 {
324 FourxmDemuxContext *fourxm = (FourxmDemuxContext *)s->priv_data;
325
326 av_free(fourxm->tracks);
327
328 return 0;
329 }
330
331 static AVInputFormat fourxm_iformat = {
332 "4xm",
333 "4X Technologies format",
334 sizeof(FourxmDemuxContext),
335 fourxm_probe,
336 fourxm_read_header,
337 fourxm_read_packet,
338 fourxm_read_close,
339 };
340
341 int fourxm_init(void)
342 {
343 av_register_input_format(&fourxm_iformat);
344 return 0;
345 }