summaryrefslogtreecommitdiff
path: root/libavformat/sierravmd.c (plain)
blob: 6960c2868fbeefd0f249da42179e8fe5939e6b1d
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
39typedef struct vmd_frame {
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
48typedef 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
65static 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
85static 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->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
122 vst->codecpar->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
123 vst->codecpar->codec_tag = 0; /* no fourcc */
124 vst->codecpar->width = width;
125 vst->codecpar->height = height;
126 if(vmd->is_indeo3 && vst->codecpar->width > 320){
127 vst->codecpar->width >>= 1;
128 vst->codecpar->height >>= 1;
129 }
130 if (ff_alloc_extradata(vst->codecpar, VMD_HEADER_SIZE))
131 return AVERROR(ENOMEM);
132 memcpy(vst->codecpar->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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
143 st->codecpar->codec_id = AV_CODEC_ID_VMDAUDIO;
144 st->codecpar->codec_tag = 0; /* no fourcc */
145 st->codecpar->sample_rate = vmd->sample_rate;
146 st->codecpar->block_align = AV_RL16(&vmd->vmd_header[806]);
147 if (st->codecpar->block_align & 0x8000) {
148 st->codecpar->bits_per_coded_sample = 16;
149 st->codecpar->block_align = -(st->codecpar->block_align - 0x10000);
150 } else {
151 st->codecpar->bits_per_coded_sample = 8;
152 }
153 if (vmd->vmd_header[811] & 0x80) {
154 st->codecpar->channels = 2;
155 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
156 } else if (vmd->vmd_header[811] & 0x2) {
157 /* Shivers 2 stereo audio */
158 /* Frame length is for 1 channel */
159 st->codecpar->channels = 2;
160 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
161 st->codecpar->block_align = st->codecpar->block_align << 1;
162 } else {
163 st->codecpar->channels = 1;
164 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
165 }
166 st->codecpar->bit_rate = st->codecpar->sample_rate *
167 st->codecpar->bits_per_coded_sample * st->codecpar->channels;
168
169 /* calculate pts */
170 num = st->codecpar->block_align;
171 den = st->codecpar->sample_rate * st->codecpar->channels;
172 av_reduce(&num, &den, num, den, (1UL<<31)-1);
173 if (vst)
174 avpriv_set_pts_info(vst, 33, num, den);
175 avpriv_set_pts_info(st, 33, num, den);
176 }
177
178 toc_offset = AV_RL32(&vmd->vmd_header[812]);
179 vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
180 vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
181 avio_seek(pb, toc_offset, SEEK_SET);
182
183 raw_frame_table = NULL;
184 vmd->frame_table = NULL;
185 sound_buffers = AV_RL16(&vmd->vmd_header[808]);
186 raw_frame_table_size = vmd->frame_count * 6;
187 if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
188 av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
189 return -1;
190 }
191 raw_frame_table = av_malloc(raw_frame_table_size);
192 vmd->frame_table = av_malloc_array(vmd->frame_count * vmd->frames_per_block + sound_buffers, sizeof(vmd_frame));
193 if (!raw_frame_table || !vmd->frame_table) {
194 ret = AVERROR(ENOMEM);
195 goto error;
196 }
197 if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
198 raw_frame_table_size) {
199 ret = AVERROR(EIO);
200 goto error;
201 }
202
203 total_frames = 0;
204 for (i = 0; i < vmd->frame_count; i++) {
205
206 current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
207
208 /* handle each entry in index block */
209 for (j = 0; j < vmd->frames_per_block; j++) {
210 int type;
211 uint32_t size;
212
213 if ((ret = avio_read(pb, chunk, BYTES_PER_FRAME_RECORD)) != BYTES_PER_FRAME_RECORD) {
214 av_log(s, AV_LOG_ERROR, "Failed to read frame record\n");
215 if (ret >= 0)
216 ret = AVERROR_INVALIDDATA;
217 goto error;
218 }
219 type = chunk[0];
220 size = AV_RL32(&chunk[2]);
221 if (size > INT_MAX / 2) {
222 av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
223 ret = AVERROR_INVALIDDATA;
224 goto error;
225 }
226 if(!size && type != 1)
227 continue;
228 switch(type) {
229 case 1: /* Audio Chunk */
230 if (!st) break;
231 /* first audio chunk contains several audio buffers */
232 vmd->frame_table[total_frames].frame_offset = current_offset;
233 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
234 vmd->frame_table[total_frames].frame_size = size;
235 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
236 vmd->frame_table[total_frames].pts = current_audio_pts;
237 total_frames++;
238 if(!current_audio_pts)
239 current_audio_pts += sound_buffers - 1;
240 else
241 current_audio_pts++;
242 break;
243 case 2: /* Video Chunk */
244 vmd->frame_table[total_frames].frame_offset = current_offset;
245 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
246 vmd->frame_table[total_frames].frame_size = size;
247 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
248 vmd->frame_table[total_frames].pts = i;
249 total_frames++;
250 break;
251 }
252 current_offset += size;
253 }
254 }
255
256 av_free(raw_frame_table);
257
258 vmd->current_frame = 0;
259 vmd->frame_count = total_frames;
260
261 return 0;
262
263error:
264 av_freep(&raw_frame_table);
265 av_freep(&vmd->frame_table);
266 return ret;
267}
268
269static int vmd_read_packet(AVFormatContext *s,
270 AVPacket *pkt)
271{
272 VmdDemuxContext *vmd = s->priv_data;
273 AVIOContext *pb = s->pb;
274 int ret = 0;
275 vmd_frame *frame;
276
277 if (vmd->current_frame >= vmd->frame_count)
278 return AVERROR_EOF;
279
280 frame = &vmd->frame_table[vmd->current_frame];
281 /* position the stream (will probably be there already) */
282 avio_seek(pb, frame->frame_offset, SEEK_SET);
283
284 if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
285 return AVERROR(EIO);
286 if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
287 return AVERROR(ENOMEM);
288 pkt->pos= avio_tell(pb);
289 memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
290 if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
291 ret = avio_read(pb, pkt->data, frame->frame_size);
292 else
293 ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
294 frame->frame_size);
295
296 if (ret != frame->frame_size) {
297 av_packet_unref(pkt);
298 ret = AVERROR(EIO);
299 }
300 pkt->stream_index = frame->stream_index;
301 pkt->pts = frame->pts;
302 av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
303 (frame->frame_record[0] == 0x02) ? "video" : "audio",
304 frame->frame_size + BYTES_PER_FRAME_RECORD,
305 pkt->pts);
306
307 vmd->current_frame++;
308
309 return ret;
310}
311
312static int vmd_read_close(AVFormatContext *s)
313{
314 VmdDemuxContext *vmd = s->priv_data;
315
316 av_freep(&vmd->frame_table);
317
318 return 0;
319}
320
321AVInputFormat ff_vmd_demuxer = {
322 .name = "vmd",
323 .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD"),
324 .priv_data_size = sizeof(VmdDemuxContext),
325 .read_probe = vmd_probe,
326 .read_header = vmd_read_header,
327 .read_packet = vmd_read_packet,
328 .read_close = vmd_read_close,
329};
330
generated by cgit at 2024-05-17 02:10:45 (GMT)