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2ba45a60 DM |
1 | /* |
2 | * Sierra VMD Format Demuxer | |
3 | * Copyright (c) 2004 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 | * Sierra VMD file demuxer | |
25 | * by Vladimir "VAG" Gneushev (vagsoft at mail.ru) | |
26 | * for more information on the Sierra VMD file format, visit: | |
27 | * http://www.pcisys.net/~melanson/codecs/ | |
28 | */ | |
29 | ||
30 | #include "libavutil/channel_layout.h" | |
31 | #include "libavutil/intreadwrite.h" | |
32 | #include "avformat.h" | |
33 | #include "internal.h" | |
34 | #include "avio_internal.h" | |
35 | ||
36 | #define VMD_HEADER_SIZE 0x0330 | |
37 | #define BYTES_PER_FRAME_RECORD 16 | |
38 | ||
39 | typedef struct { | |
40 | int stream_index; | |
41 | int64_t frame_offset; | |
42 | unsigned int frame_size; | |
43 | int64_t pts; | |
44 | int keyframe; | |
45 | unsigned char frame_record[BYTES_PER_FRAME_RECORD]; | |
46 | } vmd_frame; | |
47 | ||
48 | typedef struct VmdDemuxContext { | |
49 | int video_stream_index; | |
50 | int audio_stream_index; | |
51 | ||
52 | unsigned int frame_count; | |
53 | unsigned int frames_per_block; | |
54 | vmd_frame *frame_table; | |
55 | unsigned int current_frame; | |
56 | int is_indeo3; | |
57 | ||
58 | int sample_rate; | |
59 | int64_t audio_sample_counter; | |
60 | int skiphdr; | |
61 | ||
62 | unsigned char vmd_header[VMD_HEADER_SIZE]; | |
63 | } VmdDemuxContext; | |
64 | ||
65 | static int vmd_probe(AVProbeData *p) | |
66 | { | |
67 | int w, h, sample_rate; | |
68 | if (p->buf_size < 806) | |
69 | return 0; | |
70 | /* check if the first 2 bytes of the file contain the appropriate size | |
71 | * of a VMD header chunk */ | |
72 | if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2) | |
73 | return 0; | |
74 | w = AV_RL16(&p->buf[12]); | |
75 | h = AV_RL16(&p->buf[14]); | |
76 | sample_rate = AV_RL16(&p->buf[804]); | |
77 | if ((!w || w > 2048 || !h || h > 2048) && | |
78 | sample_rate != 22050) | |
79 | return 0; | |
80 | ||
81 | /* only return half certainty since this check is a bit sketchy */ | |
82 | return AVPROBE_SCORE_EXTENSION; | |
83 | } | |
84 | ||
85 | static int vmd_read_header(AVFormatContext *s) | |
86 | { | |
87 | VmdDemuxContext *vmd = s->priv_data; | |
88 | AVIOContext *pb = s->pb; | |
89 | AVStream *st = NULL, *vst = NULL; | |
90 | unsigned int toc_offset; | |
91 | unsigned char *raw_frame_table; | |
92 | int raw_frame_table_size; | |
93 | int64_t current_offset; | |
94 | int i, j, ret; | |
95 | int width, height; | |
96 | unsigned int total_frames; | |
97 | int64_t current_audio_pts = 0; | |
98 | unsigned char chunk[BYTES_PER_FRAME_RECORD]; | |
99 | int num, den; | |
100 | int sound_buffers; | |
101 | ||
102 | /* fetch the main header, including the 2 header length bytes */ | |
103 | avio_seek(pb, 0, SEEK_SET); | |
104 | if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE) | |
105 | return AVERROR(EIO); | |
106 | ||
107 | width = AV_RL16(&vmd->vmd_header[12]); | |
108 | height = AV_RL16(&vmd->vmd_header[14]); | |
109 | if (width && height) { | |
110 | if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') { | |
111 | vmd->is_indeo3 = 1; | |
112 | } else { | |
113 | vmd->is_indeo3 = 0; | |
114 | } | |
115 | /* start up the decoders */ | |
116 | vst = avformat_new_stream(s, NULL); | |
117 | if (!vst) | |
118 | return AVERROR(ENOMEM); | |
119 | avpriv_set_pts_info(vst, 33, 1, 10); | |
120 | vmd->video_stream_index = vst->index; | |
121 | vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
122 | vst->codec->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO; | |
123 | vst->codec->codec_tag = 0; /* no fourcc */ | |
124 | vst->codec->width = width; | |
125 | vst->codec->height = height; | |
126 | if(vmd->is_indeo3 && vst->codec->width > 320){ | |
127 | vst->codec->width >>= 1; | |
128 | vst->codec->height >>= 1; | |
129 | } | |
130 | if (ff_alloc_extradata(vst->codec, VMD_HEADER_SIZE)) | |
131 | return AVERROR(ENOMEM); | |
132 | memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE); | |
133 | } | |
134 | ||
135 | /* if sample rate is 0, assume no audio */ | |
136 | vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]); | |
137 | if (vmd->sample_rate) { | |
138 | st = avformat_new_stream(s, NULL); | |
139 | if (!st) | |
140 | return AVERROR(ENOMEM); | |
141 | vmd->audio_stream_index = st->index; | |
142 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
143 | st->codec->codec_id = AV_CODEC_ID_VMDAUDIO; | |
144 | st->codec->codec_tag = 0; /* no fourcc */ | |
145 | if (vmd->vmd_header[811] & 0x80) { | |
146 | st->codec->channels = 2; | |
147 | st->codec->channel_layout = AV_CH_LAYOUT_STEREO; | |
148 | } else { | |
149 | st->codec->channels = 1; | |
150 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; | |
151 | } | |
152 | st->codec->sample_rate = vmd->sample_rate; | |
153 | st->codec->block_align = AV_RL16(&vmd->vmd_header[806]); | |
154 | if (st->codec->block_align & 0x8000) { | |
155 | st->codec->bits_per_coded_sample = 16; | |
156 | st->codec->block_align = -(st->codec->block_align - 0x10000); | |
157 | } else { | |
158 | st->codec->bits_per_coded_sample = 8; | |
159 | } | |
160 | st->codec->bit_rate = st->codec->sample_rate * | |
161 | st->codec->bits_per_coded_sample * st->codec->channels; | |
162 | ||
163 | /* calculate pts */ | |
164 | num = st->codec->block_align; | |
165 | den = st->codec->sample_rate * st->codec->channels; | |
166 | av_reduce(&num, &den, num, den, (1UL<<31)-1); | |
167 | if (vst) | |
168 | avpriv_set_pts_info(vst, 33, num, den); | |
169 | avpriv_set_pts_info(st, 33, num, den); | |
170 | } | |
171 | ||
172 | toc_offset = AV_RL32(&vmd->vmd_header[812]); | |
173 | vmd->frame_count = AV_RL16(&vmd->vmd_header[6]); | |
174 | vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]); | |
175 | avio_seek(pb, toc_offset, SEEK_SET); | |
176 | ||
177 | raw_frame_table = NULL; | |
178 | vmd->frame_table = NULL; | |
179 | sound_buffers = AV_RL16(&vmd->vmd_header[808]); | |
180 | raw_frame_table_size = vmd->frame_count * 6; | |
181 | if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){ | |
182 | av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n"); | |
183 | return -1; | |
184 | } | |
185 | raw_frame_table = av_malloc(raw_frame_table_size); | |
186 | vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame)); | |
187 | if (!raw_frame_table || !vmd->frame_table) { | |
188 | ret = AVERROR(ENOMEM); | |
189 | goto error; | |
190 | } | |
191 | if (avio_read(pb, raw_frame_table, raw_frame_table_size) != | |
192 | raw_frame_table_size) { | |
193 | ret = AVERROR(EIO); | |
194 | goto error; | |
195 | } | |
196 | ||
197 | total_frames = 0; | |
198 | for (i = 0; i < vmd->frame_count; i++) { | |
199 | ||
200 | current_offset = AV_RL32(&raw_frame_table[6 * i + 2]); | |
201 | ||
202 | /* handle each entry in index block */ | |
203 | for (j = 0; j < vmd->frames_per_block; j++) { | |
204 | int type; | |
205 | uint32_t size; | |
206 | ||
207 | if ((ret = avio_read(pb, chunk, BYTES_PER_FRAME_RECORD)) != BYTES_PER_FRAME_RECORD) { | |
208 | av_log(s, AV_LOG_ERROR, "Failed to read frame record\n"); | |
209 | if (ret >= 0) | |
210 | ret = AVERROR_INVALIDDATA; | |
211 | goto error; | |
212 | } | |
213 | type = chunk[0]; | |
214 | size = AV_RL32(&chunk[2]); | |
215 | if (size > INT_MAX / 2) { | |
216 | av_log(s, AV_LOG_ERROR, "Invalid frame size\n"); | |
217 | ret = AVERROR_INVALIDDATA; | |
218 | goto error; | |
219 | } | |
220 | if(!size && type != 1) | |
221 | continue; | |
222 | switch(type) { | |
223 | case 1: /* Audio Chunk */ | |
224 | if (!st) break; | |
225 | /* first audio chunk contains several audio buffers */ | |
226 | vmd->frame_table[total_frames].frame_offset = current_offset; | |
227 | vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index; | |
228 | vmd->frame_table[total_frames].frame_size = size; | |
229 | memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD); | |
230 | vmd->frame_table[total_frames].pts = current_audio_pts; | |
231 | total_frames++; | |
232 | if(!current_audio_pts) | |
233 | current_audio_pts += sound_buffers - 1; | |
234 | else | |
235 | current_audio_pts++; | |
236 | break; | |
237 | case 2: /* Video Chunk */ | |
238 | vmd->frame_table[total_frames].frame_offset = current_offset; | |
239 | vmd->frame_table[total_frames].stream_index = vmd->video_stream_index; | |
240 | vmd->frame_table[total_frames].frame_size = size; | |
241 | memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD); | |
242 | vmd->frame_table[total_frames].pts = i; | |
243 | total_frames++; | |
244 | break; | |
245 | } | |
246 | current_offset += size; | |
247 | } | |
248 | } | |
249 | ||
250 | av_free(raw_frame_table); | |
251 | ||
252 | vmd->current_frame = 0; | |
253 | vmd->frame_count = total_frames; | |
254 | ||
255 | return 0; | |
256 | ||
257 | error: | |
258 | av_freep(&raw_frame_table); | |
259 | av_freep(&vmd->frame_table); | |
260 | return ret; | |
261 | } | |
262 | ||
263 | static int vmd_read_packet(AVFormatContext *s, | |
264 | AVPacket *pkt) | |
265 | { | |
266 | VmdDemuxContext *vmd = s->priv_data; | |
267 | AVIOContext *pb = s->pb; | |
268 | int ret = 0; | |
269 | vmd_frame *frame; | |
270 | ||
271 | if (vmd->current_frame >= vmd->frame_count) | |
272 | return AVERROR_EOF; | |
273 | ||
274 | frame = &vmd->frame_table[vmd->current_frame]; | |
275 | /* position the stream (will probably be there already) */ | |
276 | avio_seek(pb, frame->frame_offset, SEEK_SET); | |
277 | ||
278 | if(ffio_limit(pb, frame->frame_size) != frame->frame_size) | |
279 | return AVERROR(EIO); | |
280 | if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD)) | |
281 | return AVERROR(ENOMEM); | |
282 | pkt->pos= avio_tell(pb); | |
283 | memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD); | |
284 | if(vmd->is_indeo3 && frame->frame_record[0] == 0x02) | |
285 | ret = avio_read(pb, pkt->data, frame->frame_size); | |
286 | else | |
287 | ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD, | |
288 | frame->frame_size); | |
289 | ||
290 | if (ret != frame->frame_size) { | |
291 | av_free_packet(pkt); | |
292 | ret = AVERROR(EIO); | |
293 | } | |
294 | pkt->stream_index = frame->stream_index; | |
295 | pkt->pts = frame->pts; | |
296 | av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n", | |
297 | (frame->frame_record[0] == 0x02) ? "video" : "audio", | |
298 | frame->frame_size + BYTES_PER_FRAME_RECORD, | |
299 | pkt->pts); | |
300 | ||
301 | vmd->current_frame++; | |
302 | ||
303 | return ret; | |
304 | } | |
305 | ||
306 | static int vmd_read_close(AVFormatContext *s) | |
307 | { | |
308 | VmdDemuxContext *vmd = s->priv_data; | |
309 | ||
310 | av_freep(&vmd->frame_table); | |
311 | ||
312 | return 0; | |
313 | } | |
314 | ||
315 | AVInputFormat ff_vmd_demuxer = { | |
316 | .name = "vmd", | |
317 | .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD"), | |
318 | .priv_data_size = sizeof(VmdDemuxContext), | |
319 | .read_probe = vmd_probe, | |
320 | .read_header = vmd_read_header, | |
321 | .read_packet = vmd_read_packet, | |
322 | .read_close = vmd_read_close, | |
323 | }; |