FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/sierravmd.c
Date: 2026-09-04 04:29:05
Exec Total Coverage
Lines: 140 169 82.8%
Functions: 4 4 100.0%
Branches: 54 99 54.5%
Line Branch Exec Source
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 "libavutil/mem.h"
33 #include "avformat.h"
34 #include "avio_internal.h"
35 #include "demux.h"
36 #include "internal.h"
37 #include "avio_internal.h"
38
39 #define VMD_HEADER_SIZE 0x0330
40 #define BYTES_PER_FRAME_RECORD 16
41
42 typedef struct vmd_frame {
43 int stream_index;
44 unsigned int frame_size;
45 int64_t frame_offset;
46 int64_t pts;
47 unsigned char frame_record[BYTES_PER_FRAME_RECORD];
48 } vmd_frame;
49
50 typedef struct VmdDemuxContext {
51 int video_stream_index;
52 int audio_stream_index;
53
54 unsigned int frame_count;
55 unsigned int frames_per_block;
56 vmd_frame *frame_table;
57 unsigned int current_frame;
58 int is_indeo3;
59
60 int sample_rate;
61 int64_t audio_sample_counter;
62 int skiphdr;
63
64 unsigned char vmd_header[VMD_HEADER_SIZE];
65 } VmdDemuxContext;
66
67 7961 static int vmd_probe(const AVProbeData *p)
68 {
69 int w, h, sample_rate;
70
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 7961 if (p->buf_size < 806)
71 124 return 0;
72 /* check if the first 2 bytes of the file contain the appropriate size
73 * of a VMD header chunk */
74
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 7837 if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
75 7834 return 0;
76 3 w = AV_RL16(&p->buf[12]);
77 3 h = AV_RL16(&p->buf[14]);
78 3 sample_rate = AV_RL16(&p->buf[804]);
79
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 3 if ((!w || w > 2048 || !h || h > 2048) &&
80 sample_rate != 22050)
81 ✗ return 0;
82 /* the header of a file with a video stream carries the 6bit VGA
83 * palette that vmdvideo_decode_init() loads from offset 28 */
84
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 3 if (w && h)
85
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 2307 for (int i = 28; i < 28 + 3 * 256; i++)
86
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 2304 if (p->buf[i] > 0x3F)
87 ✗ return 0;
88
89 /* only return half certainty since this check is a bit sketchy */
90 3 return AVPROBE_SCORE_EXTENSION;
91 }
92
93 3 static int vmd_read_header(AVFormatContext *s)
94 {
95 3 VmdDemuxContext *vmd = s->priv_data;
96 3 AVIOContext *pb = s->pb;
97 3 AVStream *st = NULL, *vst = NULL;
98 unsigned int toc_offset;
99 unsigned char *raw_frame_table;
100 int raw_frame_table_size;
101 int64_t current_offset;
102 int i, j, ret;
103 int width, height;
104 unsigned int total_frames;
105 3 int64_t current_audio_pts = 0;
106 unsigned char chunk[BYTES_PER_FRAME_RECORD];
107 int num, den;
108 int sound_buffers;
109
110 /* fetch the main header, including the 2 header length bytes */
111 3 avio_seek(pb, 0, SEEK_SET);
112
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 3 if ((ret = ffio_read_size(pb, vmd->vmd_header, VMD_HEADER_SIZE)) < 0)
113 ✗ return ret;
114
115 3 width = AV_RL16(&vmd->vmd_header[12]);
116 3 height = AV_RL16(&vmd->vmd_header[14]);
117
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 3 if (width && height) {
118
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 3 if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') {
119 ✗ vmd->is_indeo3 = 1;
120 } else {
121 3 vmd->is_indeo3 = 0;
122 }
123 /* start up the decoders */
124 3 vst = avformat_new_stream(s, NULL);
125
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 3 if (!vst)
126 ✗ return AVERROR(ENOMEM);
127 3 avpriv_set_pts_info(vst, 33, 1, 10);
128 3 vmd->video_stream_index = vst->index;
129 3 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
130
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 3 vst->codecpar->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
131 3 vst->codecpar->codec_tag = 0; /* no fourcc */
132 3 vst->codecpar->width = width;
133 3 vst->codecpar->height = height;
134
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 3 if(vmd->is_indeo3 && vst->codecpar->width > 320){
135 ✗ vst->codecpar->width >>= 1;
136 ✗ vst->codecpar->height >>= 1;
137 }
138
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 3 if ((ret = ff_alloc_extradata(vst->codecpar, VMD_HEADER_SIZE)) < 0)
139 ✗ return ret;
140 3 memcpy(vst->codecpar->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
141 }
142
143 /* if sample rate is 0, assume no audio */
144 3 vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
145
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 3 if (vmd->sample_rate) {
146 int channels;
147 3 st = avformat_new_stream(s, NULL);
148
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 3 if (!st)
149 ✗ return AVERROR(ENOMEM);
150 3 vmd->audio_stream_index = st->index;
151 3 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
152 3 st->codecpar->codec_id = AV_CODEC_ID_VMDAUDIO;
153 3 st->codecpar->codec_tag = 0; /* no fourcc */
154 3 st->codecpar->sample_rate = vmd->sample_rate;
155 3 st->codecpar->block_align = AV_RL16(&vmd->vmd_header[806]);
156
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 3 if (st->codecpar->block_align & 0x8000) {
157 ✗ st->codecpar->bits_per_coded_sample = 16;
158 ✗ st->codecpar->block_align = -(st->codecpar->block_align - 0x10000);
159 } else {
160 3 st->codecpar->bits_per_coded_sample = 8;
161 }
162
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 3 if (vmd->vmd_header[811] & 0x80) {
163 ✗ channels = 2;
164
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 3 } else if (vmd->vmd_header[811] & 0x2) {
165 /* Shivers 2 stereo audio */
166 /* Frame length is for 1 channel */
167 ✗ channels = 2;
168 ✗ st->codecpar->block_align = st->codecpar->block_align << 1;
169 } else {
170 3 channels = 1;
171 }
172 3 av_channel_layout_default(&st->codecpar->ch_layout, channels);
173 3 st->codecpar->bit_rate = st->codecpar->sample_rate *
174 3 st->codecpar->bits_per_coded_sample * channels;
175
176 /* calculate pts */
177 3 num = st->codecpar->block_align;
178 3 den = st->codecpar->sample_rate * channels;
179 3 av_reduce(&num, &den, num, den, (1UL<<31)-1);
180
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 3 if (vst)
181 3 avpriv_set_pts_info(vst, 33, num, den);
182 3 avpriv_set_pts_info(st, 33, num, den);
183 }
184
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 3 if (!s->nb_streams)
185 ✗ return AVERROR_INVALIDDATA;
186
187 3 toc_offset = AV_RL32(&vmd->vmd_header[812]);
188 3 vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
189 3 vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
190 3 avio_seek(pb, toc_offset, SEEK_SET);
191
192 3 raw_frame_table = NULL;
193 3 vmd->frame_table = NULL;
194 3 sound_buffers = AV_RL16(&vmd->vmd_header[808]);
195 3 raw_frame_table_size = vmd->frame_count * 6;
196 3 raw_frame_table = av_malloc(raw_frame_table_size);
197 3 vmd->frame_table = av_malloc_array(vmd->frame_count * vmd->frames_per_block + sound_buffers, sizeof(vmd_frame));
198
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 3 if (!raw_frame_table || !vmd->frame_table) {
199 ✗ ret = AVERROR(ENOMEM);
200 ✗ goto error;
201 }
202
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 3 if ((ret = ffio_read_size(pb, raw_frame_table, raw_frame_table_size)) < 0)
203 ✗ goto error;
204
205 3 total_frames = 0;
206
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 648 for (i = 0; i < vmd->frame_count; i++) {
207
208 645 current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
209
210 /* handle each entry in index block */
211
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 1935 for (j = 0; j < vmd->frames_per_block; j++) {
212 int type;
213 uint32_t size;
214
215
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 1290 if ((ret = avio_read(pb, chunk, BYTES_PER_FRAME_RECORD)) != BYTES_PER_FRAME_RECORD) {
216 ✗ av_log(s, AV_LOG_ERROR, "Failed to read frame record\n");
217 ✗ if (ret >= 0)
218 ✗ ret = AVERROR_INVALIDDATA;
219 ✗ goto error;
220 }
221 1290 type = chunk[0];
222 1290 size = AV_RL32(&chunk[2]);
223
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 1290 if (size > INT_MAX / 2) {
224 ✗ av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
225 ✗ ret = AVERROR_INVALIDDATA;
226 ✗ goto error;
227 }
228
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 1290 if(!size && type != 1)
229 294 continue;
230
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 996 switch(type) {
231 645 case 1: /* Audio Chunk */
232
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 645 if (!st) break;
233 /* first audio chunk contains several audio buffers */
234 645 vmd->frame_table[total_frames].frame_offset = current_offset;
235 645 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
236 645 vmd->frame_table[total_frames].frame_size = size;
237 645 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
238 645 vmd->frame_table[total_frames].pts = current_audio_pts;
239 645 total_frames++;
240
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 645 if(!current_audio_pts)
241 3 current_audio_pts += sound_buffers - 1;
242 else
243 642 current_audio_pts++;
244 645 break;
245 351 case 2: /* Video Chunk */
246
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 351 if (!vst)
247 ✗ break;
248 351 vmd->frame_table[total_frames].frame_offset = current_offset;
249 351 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
250 351 vmd->frame_table[total_frames].frame_size = size;
251 351 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
252 351 vmd->frame_table[total_frames].pts = i;
253 351 total_frames++;
254 351 break;
255 }
256 996 current_offset += size;
257 }
258 }
259
260
261 3 vmd->current_frame = 0;
262 3 vmd->frame_count = total_frames;
263
264 3 ret = 0;
265 3 error:
266 3 av_freep(&raw_frame_table);
267 3 return ret;
268 }
269
270 731 static int vmd_read_packet(AVFormatContext *s,
271 AVPacket *pkt)
272 {
273 731 VmdDemuxContext *vmd = s->priv_data;
274 731 AVIOContext *pb = s->pb;
275 731 int ret = 0;
276 vmd_frame *frame;
277
278
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 731 if (vmd->current_frame >= vmd->frame_count)
279 2 return AVERROR_EOF;
280
281 729 frame = &vmd->frame_table[vmd->current_frame];
282 /* position the stream (will probably be there already) */
283 729 avio_seek(pb, frame->frame_offset, SEEK_SET);
284
285
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 729 if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
286 ✗ return AVERROR_INVALIDDATA;
287 729 ret = av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD);
288
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 729 if (ret < 0)
289 ✗ return ret;
290 729 pkt->pos= avio_tell(pb);
291 729 memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
292
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 729 if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
293 ✗ ret = ffio_read_size(pb, pkt->data, frame->frame_size);
294 else
295 729 ret = ffio_read_size(pb, pkt->data + BYTES_PER_FRAME_RECORD,
296 729 frame->frame_size);
297
298 729 pkt->stream_index = frame->stream_index;
299 729 pkt->pts = frame->pts;
300 729 av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
301 729 (frame->frame_record[0] == 0x02) ? "video" : "audio",
302
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 729 frame->frame_size + BYTES_PER_FRAME_RECORD,
303 pkt->pts);
304
305 729 vmd->current_frame++;
306
307 729 return ret;
308 }
309
310 3 static int vmd_read_close(AVFormatContext *s)
311 {
312 3 VmdDemuxContext *vmd = s->priv_data;
313
314 3 av_freep(&vmd->frame_table);
315
316 3 return 0;
317 }
318
319 const FFInputFormat ff_vmd_demuxer = {
320 .p.name = "vmd",
321 .p.long_name = NULL_IF_CONFIG_SMALL("Sierra VMD"),
322 .priv_data_size = sizeof(VmdDemuxContext),
323 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
324 .read_probe = vmd_probe,
325 .read_header = vmd_read_header,
326 .read_packet = vmd_read_packet,
327 .read_close = vmd_read_close,
328 };
329