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  unsigned int frame_size;
42  int64_t frame_offset;
43  int64_t pts;
44  unsigned char frame_record[BYTES_PER_FRAME_RECORD];
45} vmd_frame;
46
47typedef struct VmdDemuxContext {
48    int video_stream_index;
49    int audio_stream_index;
50
51    unsigned int frame_count;
52    unsigned int frames_per_block;
53    vmd_frame *frame_table;
54    unsigned int current_frame;
55    int is_indeo3;
56
57    int sample_rate;
58    int64_t audio_sample_counter;
59    int skiphdr;
60
61    unsigned char vmd_header[VMD_HEADER_SIZE];
62} VmdDemuxContext;
63
64static int vmd_probe(const AVProbeData *p)
65{
66    int w, h, sample_rate;
67    if (p->buf_size < 806)
68        return 0;
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)
72        return 0;
73    w = AV_RL16(&p->buf[12]);
74    h = AV_RL16(&p->buf[14]);
75    sample_rate = AV_RL16(&p->buf[804]);
76    if ((!w || w > 2048 || !h || h > 2048) &&
77        sample_rate != 22050)
78        return 0;
79
80    /* only return half certainty since this check is a bit sketchy */
81    return AVPROBE_SCORE_EXTENSION;
82}
83
84static int vmd_read_header(AVFormatContext *s)
85{
86    VmdDemuxContext *vmd = s->priv_data;
87    AVIOContext *pb = s->pb;
88    AVStream *st = NULL, *vst = NULL;
89    unsigned int toc_offset;
90    unsigned char *raw_frame_table;
91    int raw_frame_table_size;
92    int64_t current_offset;
93    int i, j, ret;
94    int width, height;
95    unsigned int total_frames;
96    int64_t current_audio_pts = 0;
97    unsigned char chunk[BYTES_PER_FRAME_RECORD];
98    int num, den;
99    int sound_buffers;
100
101    /* fetch the main header, including the 2 header length bytes */
102    avio_seek(pb, 0, SEEK_SET);
103    if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
104        return AVERROR(EIO);
105
106    width = AV_RL16(&vmd->vmd_header[12]);
107    height = AV_RL16(&vmd->vmd_header[14]);
108    if (width && height) {
109        if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') {
110            vmd->is_indeo3 = 1;
111        } else {
112            vmd->is_indeo3 = 0;
113        }
114        /* start up the decoders */
115        vst = avformat_new_stream(s, NULL);
116        if (!vst)
117            return AVERROR(ENOMEM);
118        avpriv_set_pts_info(vst, 33, 1, 10);
119        vmd->video_stream_index = vst->index;
120        vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
121        vst->codecpar->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
122        vst->codecpar->codec_tag = 0;  /* no fourcc */
123        vst->codecpar->width = width;
124        vst->codecpar->height = height;
125        if(vmd->is_indeo3 && vst->codecpar->width > 320){
126            vst->codecpar->width >>= 1;
127            vst->codecpar->height >>= 1;
128        }
129        if ((ret = ff_alloc_extradata(vst->codecpar, VMD_HEADER_SIZE)) < 0)
130            return ret;
131        memcpy(vst->codecpar->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
132    }
133
134    /* if sample rate is 0, assume no audio */
135    vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
136    if (vmd->sample_rate) {
137        int channels;
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            channels = 2;
155        } else if (vmd->vmd_header[811] & 0x2) {
156            /* Shivers 2 stereo audio */
157            /* Frame length is for 1 channel */
158            channels        = 2;
159            st->codecpar->block_align = st->codecpar->block_align << 1;
160        } else {
161            channels = 1;
162        }
163        av_channel_layout_default(&st->codecpar->ch_layout, channels);
164        st->codecpar->bit_rate = st->codecpar->sample_rate *
165            st->codecpar->bits_per_coded_sample * channels;
166
167        /* calculate pts */
168        num = st->codecpar->block_align;
169        den = st->codecpar->sample_rate * channels;
170        av_reduce(&num, &den, num, den, (1UL<<31)-1);
171        if (vst)
172            avpriv_set_pts_info(vst, 33, num, den);
173        avpriv_set_pts_info(st, 33, num, den);
174    }
175    if (!s->nb_streams)
176        return AVERROR_INVALIDDATA;
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    raw_frame_table = av_malloc(raw_frame_table_size);
188    vmd->frame_table = av_malloc_array(vmd->frame_count * vmd->frames_per_block + sound_buffers, sizeof(vmd_frame));
189    if (!raw_frame_table || !vmd->frame_table) {
190        ret = AVERROR(ENOMEM);
191        goto error;
192    }
193    if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
194        raw_frame_table_size) {
195        ret = AVERROR(EIO);
196        goto error;
197    }
198
199    total_frames = 0;
200    for (i = 0; i < vmd->frame_count; i++) {
201
202        current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
203
204        /* handle each entry in index block */
205        for (j = 0; j < vmd->frames_per_block; j++) {
206            int type;
207            uint32_t size;
208
209            if ((ret = avio_read(pb, chunk, BYTES_PER_FRAME_RECORD)) != BYTES_PER_FRAME_RECORD) {
210                av_log(s, AV_LOG_ERROR, "Failed to read frame record\n");
211                if (ret >= 0)
212                    ret = AVERROR_INVALIDDATA;
213                goto error;
214            }
215            type = chunk[0];
216            size = AV_RL32(&chunk[2]);
217            if (size > INT_MAX / 2) {
218                av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
219                ret = AVERROR_INVALIDDATA;
220                goto error;
221            }
222            if(!size && type != 1)
223                continue;
224            switch(type) {
225            case 1: /* Audio Chunk */
226                if (!st) break;
227                /* first audio chunk contains several audio buffers */
228                vmd->frame_table[total_frames].frame_offset = current_offset;
229                vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
230                vmd->frame_table[total_frames].frame_size = size;
231                memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
232                vmd->frame_table[total_frames].pts = current_audio_pts;
233                total_frames++;
234                if(!current_audio_pts)
235                    current_audio_pts += sound_buffers - 1;
236                else
237                    current_audio_pts++;
238                break;
239            case 2: /* Video Chunk */
240                if (!vst)
241                    break;
242                vmd->frame_table[total_frames].frame_offset = current_offset;
243                vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
244                vmd->frame_table[total_frames].frame_size = size;
245                memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
246                vmd->frame_table[total_frames].pts = i;
247                total_frames++;
248                break;
249            }
250            current_offset += size;
251        }
252    }
253
254
255    vmd->current_frame = 0;
256    vmd->frame_count = total_frames;
257
258    ret = 0;
259error:
260    av_freep(&raw_frame_table);
261    return ret;
262}
263
264static int vmd_read_packet(AVFormatContext *s,
265                           AVPacket *pkt)
266{
267    VmdDemuxContext *vmd = s->priv_data;
268    AVIOContext *pb = s->pb;
269    int ret = 0;
270    vmd_frame *frame;
271
272    if (vmd->current_frame >= vmd->frame_count)
273        return AVERROR_EOF;
274
275    frame = &vmd->frame_table[vmd->current_frame];
276    /* position the stream (will probably be there already) */
277    avio_seek(pb, frame->frame_offset, SEEK_SET);
278
279    if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
280        return AVERROR(EIO);
281    ret = av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD);
282    if (ret < 0)
283        return ret;
284    pkt->pos= avio_tell(pb);
285    memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
286    if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
287        ret = avio_read(pb, pkt->data, frame->frame_size);
288    else
289        ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
290            frame->frame_size);
291
292    if (ret != frame->frame_size) {
293        ret = AVERROR(EIO);
294    }
295    pkt->stream_index = frame->stream_index;
296    pkt->pts = frame->pts;
297    av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
298            (frame->frame_record[0] == 0x02) ? "video" : "audio",
299            frame->frame_size + BYTES_PER_FRAME_RECORD,
300            pkt->pts);
301
302    vmd->current_frame++;
303
304    return ret;
305}
306
307static int vmd_read_close(AVFormatContext *s)
308{
309    VmdDemuxContext *vmd = s->priv_data;
310
311    av_freep(&vmd->frame_table);
312
313    return 0;
314}
315
316const AVInputFormat ff_vmd_demuxer = {
317    .name           = "vmd",
318    .long_name      = NULL_IF_CONFIG_SMALL("Sierra VMD"),
319    .priv_data_size = sizeof(VmdDemuxContext),
320    .flags_internal = FF_FMT_INIT_CLEANUP,
321    .read_probe     = vmd_probe,
322    .read_header    = vmd_read_header,
323    .read_packet    = vmd_read_packet,
324    .read_close     = vmd_read_close,
325};
326