2 * Sierra VMD Format Demuxer
3 * Copyright (c) 2004 The ffmpeg Project
5 * This file is part of Libav.
7 * Libav 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.
12 * Libav 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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/
30 #include "libavutil/channel_layout.h"
31 #include "libavutil/intreadwrite.h"
35 #define VMD_HEADER_SIZE 0x0330
36 #define BYTES_PER_FRAME_RECORD 16
38 typedef struct vmd_frame {
41 unsigned int frame_size;
44 unsigned char frame_record[BYTES_PER_FRAME_RECORD];
47 typedef struct VmdDemuxContext {
48 int video_stream_index;
49 int audio_stream_index;
51 unsigned int frame_count;
52 unsigned int frames_per_block;
53 vmd_frame *frame_table;
54 unsigned int current_frame;
58 int64_t audio_sample_counter;
61 unsigned char vmd_header[VMD_HEADER_SIZE];
64 static int vmd_probe(AVProbeData *p)
69 /* check if the first 2 bytes of the file contain the appropriate size
70 * of a VMD header chunk */
71 if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
73 w = AV_RL16(&p->buf[12]);
74 h = AV_RL16(&p->buf[14]);
75 if (!w || w > 2048 || !h || h > 2048)
78 /* only return half certainty since this check is a bit sketchy */
79 return AVPROBE_SCORE_EXTENSION;
82 static int vmd_read_header(AVFormatContext *s)
84 VmdDemuxContext *vmd = s->priv_data;
85 AVIOContext *pb = s->pb;
86 AVStream *st = NULL, *vst;
87 unsigned int toc_offset;
88 unsigned char *raw_frame_table;
89 int raw_frame_table_size;
90 int64_t current_offset;
92 unsigned int total_frames;
93 int64_t current_audio_pts = 0;
94 unsigned char chunk[BYTES_PER_FRAME_RECORD];
98 /* fetch the main header, including the 2 header length bytes */
99 avio_seek(pb, 0, SEEK_SET);
100 if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
103 if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3')
107 /* start up the decoders */
108 vst = avformat_new_stream(s, NULL);
110 return AVERROR(ENOMEM);
111 avpriv_set_pts_info(vst, 33, 1, 10);
112 vmd->video_stream_index = vst->index;
113 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
114 vst->codec->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
115 vst->codec->codec_tag = 0; /* no fourcc */
116 vst->codec->width = AV_RL16(&vmd->vmd_header[12]);
117 vst->codec->height = AV_RL16(&vmd->vmd_header[14]);
118 if(vmd->is_indeo3 && vst->codec->width > 320){
119 vst->codec->width >>= 1;
120 vst->codec->height >>= 1;
122 vst->codec->extradata_size = VMD_HEADER_SIZE;
123 vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE);
124 memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
126 /* if sample rate is 0, assume no audio */
127 vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
128 if (vmd->sample_rate) {
129 st = avformat_new_stream(s, NULL);
131 return AVERROR(ENOMEM);
132 vmd->audio_stream_index = st->index;
133 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
134 st->codec->codec_id = AV_CODEC_ID_VMDAUDIO;
135 st->codec->codec_tag = 0; /* no fourcc */
136 if (vmd->vmd_header[811] & 0x80) {
137 st->codec->channels = 2;
138 st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
140 st->codec->channels = 1;
141 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
143 st->codec->sample_rate = vmd->sample_rate;
144 st->codec->block_align = AV_RL16(&vmd->vmd_header[806]);
145 if (st->codec->block_align & 0x8000) {
146 st->codec->bits_per_coded_sample = 16;
147 st->codec->block_align = -(st->codec->block_align - 0x10000);
149 st->codec->bits_per_coded_sample = 8;
151 st->codec->bit_rate = st->codec->sample_rate *
152 st->codec->bits_per_coded_sample * st->codec->channels;
155 num = st->codec->block_align;
156 den = st->codec->sample_rate * st->codec->channels;
157 av_reduce(&den, &num, den, num, (1UL<<31)-1);
158 avpriv_set_pts_info(vst, 33, num, den);
159 avpriv_set_pts_info(st, 33, num, den);
162 toc_offset = AV_RL32(&vmd->vmd_header[812]);
163 vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
164 vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
165 avio_seek(pb, toc_offset, SEEK_SET);
167 raw_frame_table = NULL;
168 vmd->frame_table = NULL;
169 sound_buffers = AV_RL16(&vmd->vmd_header[808]);
170 raw_frame_table_size = vmd->frame_count * 6;
171 if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
172 av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
175 raw_frame_table = av_malloc(raw_frame_table_size);
176 vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame));
177 if (!raw_frame_table || !vmd->frame_table) {
178 ret = AVERROR(ENOMEM);
181 if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
182 raw_frame_table_size) {
188 for (i = 0; i < vmd->frame_count; i++) {
190 current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
192 /* handle each entry in index block */
193 for (j = 0; j < vmd->frames_per_block; j++) {
197 avio_read(pb, chunk, BYTES_PER_FRAME_RECORD);
199 size = AV_RL32(&chunk[2]);
200 if (size > INT_MAX / 2) {
201 av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
202 ret = AVERROR_INVALIDDATA;
205 if(!size && type != 1)
208 case 1: /* Audio Chunk */
210 /* first audio chunk contains several audio buffers */
211 vmd->frame_table[total_frames].frame_offset = current_offset;
212 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
213 vmd->frame_table[total_frames].frame_size = size;
214 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
215 vmd->frame_table[total_frames].pts = current_audio_pts;
217 if(!current_audio_pts)
218 current_audio_pts += sound_buffers - 1;
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 = i;
231 current_offset += size;
235 av_free(raw_frame_table);
237 vmd->current_frame = 0;
238 vmd->frame_count = total_frames;
243 av_free(raw_frame_table);
244 av_free(vmd->frame_table);
248 static int vmd_read_packet(AVFormatContext *s,
251 VmdDemuxContext *vmd = s->priv_data;
252 AVIOContext *pb = s->pb;
256 if (vmd->current_frame >= vmd->frame_count)
259 frame = &vmd->frame_table[vmd->current_frame];
260 /* position the stream (will probably be there already) */
261 avio_seek(pb, frame->frame_offset, SEEK_SET);
263 if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
264 return AVERROR(ENOMEM);
265 pkt->pos= avio_tell(pb);
266 memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
267 if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
268 ret = avio_read(pb, pkt->data, frame->frame_size);
270 ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
273 if (ret != frame->frame_size) {
274 av_packet_unref(pkt);
277 pkt->stream_index = frame->stream_index;
278 pkt->pts = frame->pts;
279 av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
280 (frame->frame_record[0] == 0x02) ? "video" : "audio",
281 frame->frame_size + BYTES_PER_FRAME_RECORD,
284 vmd->current_frame++;
289 static int vmd_read_close(AVFormatContext *s)
291 VmdDemuxContext *vmd = s->priv_data;
293 av_free(vmd->frame_table);
298 AVInputFormat ff_vmd_demuxer = {
300 .long_name = NULL_IF_CONFIG_SMALL("Sierra VMD"),
301 .priv_data_size = sizeof(VmdDemuxContext),
302 .read_probe = vmd_probe,
303 .read_header = vmd_read_header,
304 .read_packet = vmd_read_packet,
305 .read_close = vmd_read_close,