a056d9fbf3f78a5825094406b26efd10cfbc1c9d
[ffmpeg.git] / libavformat / sierravmd.c
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 sierravmd.c
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 "avformat.h"
31
32 #define VMD_HEADER_SIZE 0x0330
33 #define BYTES_PER_FRAME_RECORD 16
34
35 typedef struct {
36   int stream_index;
37   offset_t frame_offset;
38   unsigned int frame_size;
39   int64_t pts;
40   int keyframe;
41   unsigned char frame_record[BYTES_PER_FRAME_RECORD];
42 } vmd_frame_t;
43
44 typedef struct VmdDemuxContext {
45     int video_stream_index;
46     int audio_stream_index;
47
48     unsigned int frame_count;
49     unsigned int frames_per_block;
50     vmd_frame_t *frame_table;
51     unsigned int current_frame;
52
53     int sample_rate;
54     int64_t audio_sample_counter;
55     int skiphdr;
56
57     unsigned char vmd_header[VMD_HEADER_SIZE];
58 } VmdDemuxContext;
59
60 static int vmd_probe(AVProbeData *p)
61 {
62     if (p->buf_size < 2)
63         return 0;
64
65     /* check if the first 2 bytes of the file contain the appropriate size
66      * of a VMD header chunk */
67     if (LE_16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
68         return 0;
69
70     /* only return half certainty since this check is a bit sketchy */
71     return AVPROBE_SCORE_MAX / 2;
72 }
73
74 static int vmd_read_header(AVFormatContext *s,
75                            AVFormatParameters *ap)
76 {
77     VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
78     ByteIOContext *pb = &s->pb;
79     AVStream *st, *vst;
80     unsigned int toc_offset;
81     unsigned char *raw_frame_table;
82     int raw_frame_table_size;
83     offset_t current_offset;
84     int i, j;
85     unsigned int total_frames;
86     int64_t pts_inc = 1;
87     int64_t current_video_pts = 0, current_audio_pts = 0;
88     unsigned char chunk[BYTES_PER_FRAME_RECORD];
89     int num, den;
90     int sound_buffers;
91
92     /* fetch the main header, including the 2 header length bytes */
93     url_fseek(pb, 0, SEEK_SET);
94     if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
95         return AVERROR_IO;
96
97     /* start up the decoders */
98     vst = av_new_stream(s, 0);
99     if (!vst)
100         return AVERROR_NOMEM;
101     av_set_pts_info(vst, 33, 1, 10);
102     vmd->video_stream_index = vst->index;
103     vst->codec->codec_type = CODEC_TYPE_VIDEO;
104     vst->codec->codec_id = CODEC_ID_VMDVIDEO;
105     vst->codec->codec_tag = 0;  /* no fourcc */
106     vst->codec->width = LE_16(&vmd->vmd_header[12]);
107     vst->codec->height = LE_16(&vmd->vmd_header[14]);
108     vst->codec->extradata_size = VMD_HEADER_SIZE;
109     vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
110     memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
111
112     /* if sample rate is 0, assume no audio */
113     vmd->sample_rate = LE_16(&vmd->vmd_header[804]);
114     if (vmd->sample_rate) {
115         st = av_new_stream(s, 0);
116         if (!st)
117             return AVERROR_NOMEM;
118         vmd->audio_stream_index = st->index;
119         st->codec->codec_type = CODEC_TYPE_AUDIO;
120         st->codec->codec_id = CODEC_ID_VMDAUDIO;
121         st->codec->codec_tag = 0;  /* no fourcc */
122         st->codec->channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
123         st->codec->sample_rate = vmd->sample_rate;
124         st->codec->block_align = LE_16(&vmd->vmd_header[806]);
125         if (st->codec->block_align & 0x8000) {
126             st->codec->bits_per_sample = 16;
127             st->codec->block_align = -(st->codec->block_align - 0x10000);
128         } else {
129             st->codec->bits_per_sample = 8;
130         }
131         st->codec->bit_rate = st->codec->sample_rate *
132             st->codec->bits_per_sample * st->codec->channels;
133
134         /* calculate pts */
135         num = st->codec->block_align;
136         den = st->codec->sample_rate * st->codec->channels;
137         av_reduce(&den, &num, den, num, (1UL<<31)-1);
138         av_set_pts_info(vst, 33, num, den);
139         av_set_pts_info(st, 33, num, den);
140         pts_inc = num;
141     }
142
143     toc_offset = LE_32(&vmd->vmd_header[812]);
144     vmd->frame_count = LE_16(&vmd->vmd_header[6]);
145     vmd->frames_per_block = LE_16(&vmd->vmd_header[18]);
146     url_fseek(pb, toc_offset, SEEK_SET);
147
148     raw_frame_table = NULL;
149     vmd->frame_table = NULL;
150     sound_buffers = LE_16(&vmd->vmd_header[808]);
151     raw_frame_table_size = vmd->frame_count * 6;
152     raw_frame_table = av_malloc(raw_frame_table_size);
153     if(vmd->frame_count * vmd->frames_per_block  >= UINT_MAX / sizeof(vmd_frame_t)){
154         av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
155         return -1;
156     }
157     vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame_t));
158     if (!raw_frame_table || !vmd->frame_table) {
159         av_free(raw_frame_table);
160         av_free(vmd->frame_table);
161         return AVERROR_NOMEM;
162     }
163     if (get_buffer(pb, raw_frame_table, raw_frame_table_size) !=
164         raw_frame_table_size) {
165         av_free(raw_frame_table);
166         av_free(vmd->frame_table);
167         return AVERROR_IO;
168     }
169
170     total_frames = 0;
171     for (i = 0; i < vmd->frame_count; i++) {
172
173         current_offset = LE_32(&raw_frame_table[6 * i + 2]);
174
175         /* handle each entry in index block */
176         for (j = 0; j < vmd->frames_per_block; j++) {
177             int type;
178             uint32_t size;
179
180             get_buffer(pb, chunk, BYTES_PER_FRAME_RECORD);
181             type = chunk[0];
182             size = LE_32(&chunk[2]);
183             if(!size)
184                 continue;
185             switch(type) {
186             case 1: /* Audio Chunk */
187                 /* first audio chunk contains several audio buffers */
188                 if(current_audio_pts){
189                 vmd->frame_table[total_frames].frame_offset = current_offset;
190                 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
191                 vmd->frame_table[total_frames].frame_size = size;
192                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
193                 vmd->frame_table[total_frames].pts = current_audio_pts;
194                 total_frames++;
195                 current_audio_pts += pts_inc;
196                 }else{
197                     uint32_t flags;
198                     int k;
199                     int noff;
200                     int64_t pos;
201
202                     pos = url_ftell(pb);
203                     url_fseek(pb, current_offset, SEEK_SET);
204                     flags = get_le32(pb);
205                     noff = 4;
206                     url_fseek(pb, pos, SEEK_SET);
207                     av_log(s, AV_LOG_DEBUG, "Sound mapping = %08X (%i bufs)\n", flags, sound_buffers);
208                     for(k = 0; k < sound_buffers - 1; k++){
209                         if(flags & 1) { /* silent block */
210                             vmd->frame_table[total_frames].frame_size = 0;
211                         }else{
212                             vmd->frame_table[total_frames].frame_size = st->codec->block_align + (st->codec->block_align & 1);
213                         }
214                         noff += vmd->frame_table[total_frames].frame_size;
215                         vmd->frame_table[total_frames].frame_offset = current_offset + noff;
216                         vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
217                         memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
218                         vmd->frame_table[total_frames].pts = current_audio_pts;
219                         total_frames++;
220                         current_audio_pts += pts_inc;
221                         flags >>= 1;
222                     }
223                 }
224                 break;
225             case 2: /* Video Chunk */
226                 vmd->frame_table[total_frames].frame_offset = current_offset;
227                 vmd->frame_table[total_frames].stream_index = vmd->video_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_video_pts;
231                 total_frames++;
232                 break;
233             }
234             current_offset += size;
235         }
236         current_video_pts += pts_inc;
237     }
238
239     av_free(raw_frame_table);
240
241     vmd->current_frame = 0;
242     vmd->frame_count = total_frames;
243
244     return 0;
245 }
246
247 static int vmd_read_packet(AVFormatContext *s,
248                            AVPacket *pkt)
249 {
250     VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
251     ByteIOContext *pb = &s->pb;
252     int ret = 0;
253     vmd_frame_t *frame;
254
255     if (vmd->current_frame >= vmd->frame_count)
256         return AVERROR_IO;
257
258     frame = &vmd->frame_table[vmd->current_frame];
259     /* position the stream (will probably be there already) */
260     url_fseek(pb, frame->frame_offset, SEEK_SET);
261
262     if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
263         return AVERROR_NOMEM;
264     pkt->pos= url_ftell(pb);
265     memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
266     ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD,
267         frame->frame_size);
268
269     if (ret != frame->frame_size) {
270         av_free_packet(pkt);
271         ret = AVERROR_IO;
272     }
273     pkt->stream_index = frame->stream_index;
274     pkt->pts = frame->pts;
275     av_log(NULL, AV_LOG_INFO, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
276             (frame->frame_record[0] == 0x02) ? "video" : "audio",
277             frame->frame_size + BYTES_PER_FRAME_RECORD,
278             pkt->pts);
279
280     vmd->current_frame++;
281
282     return ret;
283 }
284
285 static int vmd_read_close(AVFormatContext *s)
286 {
287     VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data;
288
289     av_free(vmd->frame_table);
290
291     return 0;
292 }
293
294 AVInputFormat vmd_demuxer = {
295     "vmd",
296     "Sierra VMD format",
297     sizeof(VmdDemuxContext),
298     vmd_probe,
299     vmd_read_header,
300     vmd_read_packet,
301     vmd_read_close,
302 };