comment vorbis objectype id
[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     /* check if the first 2 bytes of the file contain the appropriate size
63      * of a VMD header chunk */
64     if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
65         return 0;
66
67     /* only return half certainty since this check is a bit sketchy */
68     return AVPROBE_SCORE_MAX / 2;
69 }
70
71 static int vmd_read_header(AVFormatContext *s,
72                            AVFormatParameters *ap)
73 {
74     VmdDemuxContext *vmd = s->priv_data;
75     ByteIOContext *pb = s->pb;
76     AVStream *st, *vst;
77     unsigned int toc_offset;
78     unsigned char *raw_frame_table;
79     int raw_frame_table_size;
80     offset_t current_offset;
81     int i, j;
82     unsigned int total_frames;
83     int64_t pts_inc = 1;
84     int64_t current_video_pts = 0, current_audio_pts = 0;
85     unsigned char chunk[BYTES_PER_FRAME_RECORD];
86     int num, den;
87     int sound_buffers;
88
89     /* fetch the main header, including the 2 header length bytes */
90     url_fseek(pb, 0, SEEK_SET);
91     if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
92         return AVERROR(EIO);
93
94     /* start up the decoders */
95     vst = av_new_stream(s, 0);
96     if (!vst)
97         return AVERROR(ENOMEM);
98     av_set_pts_info(vst, 33, 1, 10);
99     vmd->video_stream_index = vst->index;
100     vst->codec->codec_type = CODEC_TYPE_VIDEO;
101     vst->codec->codec_id = CODEC_ID_VMDVIDEO;
102     vst->codec->codec_tag = 0;  /* no fourcc */
103     vst->codec->width = AV_RL16(&vmd->vmd_header[12]);
104     vst->codec->height = AV_RL16(&vmd->vmd_header[14]);
105     vst->codec->extradata_size = VMD_HEADER_SIZE;
106     vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
107     memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
108
109     /* if sample rate is 0, assume no audio */
110     vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
111     if (vmd->sample_rate) {
112         st = av_new_stream(s, 0);
113         if (!st)
114             return AVERROR(ENOMEM);
115         vmd->audio_stream_index = st->index;
116         st->codec->codec_type = CODEC_TYPE_AUDIO;
117         st->codec->codec_id = CODEC_ID_VMDAUDIO;
118         st->codec->codec_tag = 0;  /* no fourcc */
119         st->codec->channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
120         st->codec->sample_rate = vmd->sample_rate;
121         st->codec->block_align = AV_RL16(&vmd->vmd_header[806]);
122         if (st->codec->block_align & 0x8000) {
123             st->codec->bits_per_sample = 16;
124             st->codec->block_align = -(st->codec->block_align - 0x10000);
125         } else {
126             st->codec->bits_per_sample = 8;
127         }
128         st->codec->bit_rate = st->codec->sample_rate *
129             st->codec->bits_per_sample * st->codec->channels;
130
131         /* calculate pts */
132         num = st->codec->block_align;
133         den = st->codec->sample_rate * st->codec->channels;
134         av_reduce(&den, &num, den, num, (1UL<<31)-1);
135         av_set_pts_info(vst, 33, num, den);
136         av_set_pts_info(st, 33, num, den);
137         pts_inc = num;
138     }
139
140     toc_offset = AV_RL32(&vmd->vmd_header[812]);
141     vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
142     vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
143     url_fseek(pb, toc_offset, SEEK_SET);
144
145     raw_frame_table = NULL;
146     vmd->frame_table = NULL;
147     sound_buffers = AV_RL16(&vmd->vmd_header[808]);
148     raw_frame_table_size = vmd->frame_count * 6;
149     raw_frame_table = av_malloc(raw_frame_table_size);
150     if(vmd->frame_count * vmd->frames_per_block  >= UINT_MAX / sizeof(vmd_frame_t)){
151         av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
152         return -1;
153     }
154     vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame_t));
155     if (!raw_frame_table || !vmd->frame_table) {
156         av_free(raw_frame_table);
157         av_free(vmd->frame_table);
158         return AVERROR(ENOMEM);
159     }
160     if (get_buffer(pb, raw_frame_table, raw_frame_table_size) !=
161         raw_frame_table_size) {
162         av_free(raw_frame_table);
163         av_free(vmd->frame_table);
164         return AVERROR(EIO);
165     }
166
167     total_frames = 0;
168     for (i = 0; i < vmd->frame_count; i++) {
169
170         current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
171
172         /* handle each entry in index block */
173         for (j = 0; j < vmd->frames_per_block; j++) {
174             int type;
175             uint32_t size;
176
177             get_buffer(pb, chunk, BYTES_PER_FRAME_RECORD);
178             type = chunk[0];
179             size = AV_RL32(&chunk[2]);
180             if(!size)
181                 continue;
182             switch(type) {
183             case 1: /* Audio Chunk */
184                 /* first audio chunk contains several audio buffers */
185                 if(current_audio_pts){
186                     vmd->frame_table[total_frames].frame_offset = current_offset;
187                     vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
188                     vmd->frame_table[total_frames].frame_size = size;
189                     memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
190                     vmd->frame_table[total_frames].pts = current_audio_pts;
191                     total_frames++;
192                     current_audio_pts += pts_inc;
193                 }else{
194                     uint32_t flags;
195                     int k;
196                     int noff;
197                     int64_t pos;
198
199                     pos = url_ftell(pb);
200                     url_fseek(pb, current_offset, SEEK_SET);
201                     flags = get_le32(pb);
202                     noff = 4;
203                     url_fseek(pb, pos, SEEK_SET);
204                     av_log(s, AV_LOG_DEBUG, "Sound mapping = %08X (%i bufs)\n", flags, sound_buffers);
205                     for(k = 0; k < sound_buffers - 1; k++){
206                         if(flags & 1) { /* silent block */
207                             vmd->frame_table[total_frames].frame_size = 0;
208                         }else{
209                             vmd->frame_table[total_frames].frame_size = st->codec->block_align + (st->codec->block_align & 1);
210                         }
211                         noff += vmd->frame_table[total_frames].frame_size;
212                         vmd->frame_table[total_frames].frame_offset = current_offset + noff;
213                         vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
214                         memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
215                         vmd->frame_table[total_frames].pts = current_audio_pts;
216                         total_frames++;
217                         current_audio_pts += pts_inc;
218                         flags >>= 1;
219                     }
220                 }
221                 break;
222             case 2: /* Video Chunk */
223                 vmd->frame_table[total_frames].frame_offset = current_offset;
224                 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
225                 vmd->frame_table[total_frames].frame_size = size;
226                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
227                 vmd->frame_table[total_frames].pts = current_video_pts;
228                 total_frames++;
229                 break;
230             }
231             current_offset += size;
232         }
233         current_video_pts += pts_inc;
234     }
235
236     av_free(raw_frame_table);
237
238     vmd->current_frame = 0;
239     vmd->frame_count = total_frames;
240
241     return 0;
242 }
243
244 static int vmd_read_packet(AVFormatContext *s,
245                            AVPacket *pkt)
246 {
247     VmdDemuxContext *vmd = s->priv_data;
248     ByteIOContext *pb = s->pb;
249     int ret = 0;
250     vmd_frame_t *frame;
251
252     if (vmd->current_frame >= vmd->frame_count)
253         return AVERROR(EIO);
254
255     frame = &vmd->frame_table[vmd->current_frame];
256     /* position the stream (will probably be there already) */
257     url_fseek(pb, frame->frame_offset, SEEK_SET);
258
259     if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
260         return AVERROR(ENOMEM);
261     pkt->pos= url_ftell(pb);
262     memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
263     ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD,
264         frame->frame_size);
265
266     if (ret != frame->frame_size) {
267         av_free_packet(pkt);
268         ret = AVERROR(EIO);
269     }
270     pkt->stream_index = frame->stream_index;
271     pkt->pts = frame->pts;
272     av_log(NULL, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
273             (frame->frame_record[0] == 0x02) ? "video" : "audio",
274             frame->frame_size + BYTES_PER_FRAME_RECORD,
275             pkt->pts);
276
277     vmd->current_frame++;
278
279     return ret;
280 }
281
282 static int vmd_read_close(AVFormatContext *s)
283 {
284     VmdDemuxContext *vmd = s->priv_data;
285
286     av_free(vmd->frame_table);
287
288     return 0;
289 }
290
291 AVInputFormat vmd_demuxer = {
292     "vmd",
293     "Sierra VMD format",
294     sizeof(VmdDemuxContext),
295     vmd_probe,
296     vmd_read_header,
297     vmd_read_packet,
298     vmd_read_close,
299 };