Fix a typo that made VMD demuxer always assume Indeo 3 as video codec.
[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   int64_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;
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 *frame_table;
51     unsigned int current_frame;
52     int is_indeo3;
53
54     int sample_rate;
55     int64_t audio_sample_counter;
56     int skiphdr;
57
58     unsigned char vmd_header[VMD_HEADER_SIZE];
59 } VmdDemuxContext;
60
61 static int vmd_probe(AVProbeData *p)
62 {
63     /* check if the first 2 bytes of the file contain the appropriate size
64      * of a VMD header chunk */
65     if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
66         return 0;
67
68     /* only return half certainty since this check is a bit sketchy */
69     return AVPROBE_SCORE_MAX / 2;
70 }
71
72 static int vmd_read_header(AVFormatContext *s,
73                            AVFormatParameters *ap)
74 {
75     VmdDemuxContext *vmd = s->priv_data;
76     ByteIOContext *pb = s->pb;
77     AVStream *st = NULL, *vst;
78     unsigned int toc_offset;
79     unsigned char *raw_frame_table;
80     int raw_frame_table_size;
81     int64_t current_offset;
82     int i, j;
83     unsigned int total_frames;
84     int64_t pts_inc = 1;
85     int64_t current_video_pts = 0, current_audio_pts = 0;
86     unsigned char chunk[BYTES_PER_FRAME_RECORD];
87     int num, den;
88     int sound_buffers;
89
90     /* fetch the main header, including the 2 header length bytes */
91     url_fseek(pb, 0, SEEK_SET);
92     if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
93         return AVERROR(EIO);
94
95     if(vmd->vmd_header[16] == 'i' && vmd->vmd_header[17] == 'v' && vmd->vmd_header[18] == '3')
96         vmd->is_indeo3 = 1;
97     else
98         vmd->is_indeo3 = 0;
99     /* start up the decoders */
100     vst = av_new_stream(s, 0);
101     if (!vst)
102         return AVERROR(ENOMEM);
103     av_set_pts_info(vst, 33, 1, 10);
104     vmd->video_stream_index = vst->index;
105     vst->codec->codec_type = CODEC_TYPE_VIDEO;
106     vst->codec->codec_id = vmd->is_indeo3 ? CODEC_ID_INDEO3 : CODEC_ID_VMDVIDEO;
107     vst->codec->codec_tag = 0;  /* no fourcc */
108     vst->codec->width = AV_RL16(&vmd->vmd_header[12]);
109     vst->codec->height = AV_RL16(&vmd->vmd_header[14]);
110     if(vmd->is_indeo3 && vst->codec->width > 320){
111         vst->codec->width >>= 1;
112         vst->codec->height >>= 1;
113     }
114     vst->codec->extradata_size = VMD_HEADER_SIZE;
115     vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
116     memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
117
118     /* if sample rate is 0, assume no audio */
119     vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
120     if (vmd->sample_rate) {
121         st = av_new_stream(s, 0);
122         if (!st)
123             return AVERROR(ENOMEM);
124         vmd->audio_stream_index = st->index;
125         st->codec->codec_type = CODEC_TYPE_AUDIO;
126         st->codec->codec_id = CODEC_ID_VMDAUDIO;
127         st->codec->codec_tag = 0;  /* no fourcc */
128         st->codec->channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1;
129         st->codec->sample_rate = vmd->sample_rate;
130         st->codec->block_align = AV_RL16(&vmd->vmd_header[806]);
131         if (st->codec->block_align & 0x8000) {
132             st->codec->bits_per_coded_sample = 16;
133             st->codec->block_align = -(st->codec->block_align - 0x10000);
134         } else {
135             st->codec->bits_per_coded_sample = 8;
136         }
137         st->codec->bit_rate = st->codec->sample_rate *
138             st->codec->bits_per_coded_sample * st->codec->channels;
139
140         /* calculate pts */
141         num = st->codec->block_align;
142         den = st->codec->sample_rate * st->codec->channels;
143         av_reduce(&den, &num, den, num, (1UL<<31)-1);
144         av_set_pts_info(vst, 33, num, den);
145         av_set_pts_info(st, 33, num, den);
146         pts_inc = num;
147     }
148
149     toc_offset = AV_RL32(&vmd->vmd_header[812]);
150     vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
151     vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
152     url_fseek(pb, toc_offset, SEEK_SET);
153
154     raw_frame_table = NULL;
155     vmd->frame_table = NULL;
156     sound_buffers = AV_RL16(&vmd->vmd_header[808]);
157     raw_frame_table_size = vmd->frame_count * 6;
158     if(vmd->frame_count * vmd->frames_per_block  >= UINT_MAX / sizeof(vmd_frame)){
159         av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
160         return -1;
161     }
162     raw_frame_table = av_malloc(raw_frame_table_size);
163     vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame));
164     if (!raw_frame_table || !vmd->frame_table) {
165         av_free(raw_frame_table);
166         av_free(vmd->frame_table);
167         return AVERROR(ENOMEM);
168     }
169     if (get_buffer(pb, raw_frame_table, raw_frame_table_size) !=
170         raw_frame_table_size) {
171         av_free(raw_frame_table);
172         av_free(vmd->frame_table);
173         return AVERROR(EIO);
174     }
175
176     total_frames = 0;
177     for (i = 0; i < vmd->frame_count; i++) {
178
179         current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
180
181         /* handle each entry in index block */
182         for (j = 0; j < vmd->frames_per_block; j++) {
183             int type;
184             uint32_t size;
185
186             get_buffer(pb, chunk, BYTES_PER_FRAME_RECORD);
187             type = chunk[0];
188             size = AV_RL32(&chunk[2]);
189             if(!size)
190                 continue;
191             switch(type) {
192             case 1: /* Audio Chunk */
193                 if (!st) break;
194                 /* first audio chunk contains several audio buffers */
195                 if(current_audio_pts){
196                     vmd->frame_table[total_frames].frame_offset = current_offset;
197                     vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
198                     vmd->frame_table[total_frames].frame_size = size;
199                     memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
200                     vmd->frame_table[total_frames].pts = current_audio_pts;
201                     total_frames++;
202                     current_audio_pts += pts_inc;
203                 }else{
204                     uint32_t flags;
205                     int k;
206                     int noff;
207                     int64_t pos;
208
209                     pos = url_ftell(pb);
210                     url_fseek(pb, current_offset, SEEK_SET);
211                     flags = get_le32(pb);
212                     noff = 4;
213                     url_fseek(pb, pos, SEEK_SET);
214                     av_log(s, AV_LOG_DEBUG, "Sound mapping = %08X (%i bufs)\n", flags, sound_buffers);
215                     for(k = 0; k < sound_buffers - 1; k++){
216                         if(flags & 1) { /* silent block */
217                             vmd->frame_table[total_frames].frame_size = 0;
218                         }else{
219                             vmd->frame_table[total_frames].frame_size = st->codec->block_align + (st->codec->block_align & 1);
220                         }
221                         noff += vmd->frame_table[total_frames].frame_size;
222                         vmd->frame_table[total_frames].frame_offset = current_offset + noff;
223                         vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
224                         memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
225                         vmd->frame_table[total_frames].pts = current_audio_pts;
226                         total_frames++;
227                         current_audio_pts += pts_inc;
228                         flags >>= 1;
229                     }
230                 }
231                 break;
232             case 2: /* Video Chunk */
233                 vmd->frame_table[total_frames].frame_offset = current_offset;
234                 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
235                 vmd->frame_table[total_frames].frame_size = size;
236                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
237                 vmd->frame_table[total_frames].pts = current_video_pts;
238                 total_frames++;
239                 break;
240             }
241             current_offset += size;
242         }
243         current_video_pts += pts_inc;
244     }
245
246     av_free(raw_frame_table);
247
248     vmd->current_frame = 0;
249     vmd->frame_count = total_frames;
250
251     return 0;
252 }
253
254 static int vmd_read_packet(AVFormatContext *s,
255                            AVPacket *pkt)
256 {
257     VmdDemuxContext *vmd = s->priv_data;
258     ByteIOContext *pb = s->pb;
259     int ret = 0;
260     vmd_frame *frame;
261
262     if (vmd->current_frame >= vmd->frame_count)
263         return AVERROR(EIO);
264
265     frame = &vmd->frame_table[vmd->current_frame];
266     /* position the stream (will probably be there already) */
267     url_fseek(pb, frame->frame_offset, SEEK_SET);
268
269     if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
270         return AVERROR(ENOMEM);
271     pkt->pos= url_ftell(pb);
272     memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
273     if(vmd->is_indeo3)
274         ret = get_buffer(pb, pkt->data, frame->frame_size);
275     else
276         ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD,
277             frame->frame_size);
278
279     if (ret != frame->frame_size) {
280         av_free_packet(pkt);
281         ret = AVERROR(EIO);
282     }
283     pkt->stream_index = frame->stream_index;
284     pkt->pts = frame->pts;
285     av_log(NULL, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
286             (frame->frame_record[0] == 0x02) ? "video" : "audio",
287             frame->frame_size + BYTES_PER_FRAME_RECORD,
288             pkt->pts);
289
290     vmd->current_frame++;
291
292     return ret;
293 }
294
295 static int vmd_read_close(AVFormatContext *s)
296 {
297     VmdDemuxContext *vmd = s->priv_data;
298
299     av_free(vmd->frame_table);
300
301     return 0;
302 }
303
304 AVInputFormat vmd_demuxer = {
305     "vmd",
306     NULL_IF_CONFIG_SMALL("Sierra VMD format"),
307     sizeof(VmdDemuxContext),
308     vmd_probe,
309     vmd_read_header,
310     vmd_read_packet,
311     vmd_read_close,
312 };