1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*
* AVISynth support for ffmpeg system
* Copyright (c) 2006 DivX, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "riff.h"
#include <windows.h>
#include <vfw.h>
typedef struct {
PAVISTREAM handle;
AVISTREAMINFO info;
DWORD read;
LONG chunck_size;
LONG chunck_samples;
} AVISynthStream;
typedef struct {
PAVIFILE file;
AVISynthStream *streams;
int nb_streams;
int next_stream;
} AVISynthContext;
static int avisynth_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
AVISynthContext *avs = s->priv_data;
HRESULT res;
AVIFILEINFO info;
DWORD id;
AVStream *st;
AVISynthStream *stream;
AVIFileInit();
res = AVIFileOpen(&avs->file, s->filename, OF_READ|OF_SHARE_DENY_WRITE, NULL);
if (res != S_OK)
{
av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld", res);
AVIFileExit();
return -1;
}
res = AVIFileInfo(avs->file, &info, sizeof(info));
if (res != S_OK)
{
av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld", res);
AVIFileExit();
return -1;
}
avs->streams = av_mallocz(info.dwStreams * sizeof(AVISynthStream));
for (id=0; id<info.dwStreams; id++)
{
stream = &avs->streams[id];
stream->read = 0;
if (AVIFileGetStream(avs->file, &stream->handle, 0, id) == S_OK)
{
if (AVIStreamInfo(stream->handle, &stream->info, sizeof(stream->info)) == S_OK)
{
if (stream->info.fccType == streamtypeAUDIO)
{
WAVEFORMATEX wvfmt;
LONG struct_size = sizeof(WAVEFORMATEX);
if (AVIStreamReadFormat(stream->handle, 0, &wvfmt, &struct_size) != S_OK)
continue;
st = av_new_stream(s, id);
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->block_align = wvfmt.nBlockAlign;
st->codec->channels = wvfmt.nChannels;
st->codec->sample_rate = wvfmt.nSamplesPerSec;
st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8;
st->codec->bits_per_sample = wvfmt.wBitsPerSample;
stream->chunck_samples = wvfmt.nSamplesPerSec * (uint64_t)info.dwScale / (uint64_t)info.dwRate;
stream->chunck_size = stream->chunck_samples * wvfmt.nChannels * wvfmt.wBitsPerSample / 8;
st->codec->codec_id = wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_sample);
}
else if (stream->info.fccType == streamtypeVIDEO)
{
BITMAPINFO imgfmt;
LONG struct_size = sizeof(BITMAPINFO);
stream->chunck_size = stream->info.dwSampleSize;
stream->chunck_samples = 1;
if (AVIStreamReadFormat(stream->handle, 0, &imgfmt, &struct_size) != S_OK)
continue;
st = av_new_stream(s, id);
st->codec->codec_type = CODEC_TYPE_VIDEO;
st->r_frame_rate.num = stream->info.dwRate;
st->r_frame_rate.den = stream->info.dwScale;
st->codec->width = imgfmt.bmiHeader.biWidth;
st->codec->height = imgfmt.bmiHeader.biHeight;
st->codec->bits_per_sample = stream->info.dwSampleSize * 8;
st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale;
st->codec->codec_id = codec_get_id(codec_bmp_tags, stream->info.fccHandler);
st->duration = stream->info.dwLength;
}
else
{
AVIStreamRelease(stream->handle);
continue;
}
avs->nb_streams++;
st->codec->codec_tag = stream->info.fccHandler;
st->codec->stream_codec_tag = stream->info.fccHandler;
av_set_pts_info(st, 64, info.dwScale, info.dwRate);
st->start_time = stream->info.dwStart;
}
}
}
return 0;
}
static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVISynthContext *avs = s->priv_data;
HRESULT res;
AVISynthStream *stream;
int stream_id = avs->next_stream;
LONG read_size;
// handle interleaving manually...
stream = &avs->streams[stream_id];
if (stream->read >= stream->info.dwLength)
return AVERROR_IO;
if (av_new_packet(pkt, stream->chunck_size))
return AVERROR_IO;
pkt->stream_index = stream_id;
pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples;
res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL);
pkt->pts = stream->read;
pkt->size = read_size;
stream->read += stream->chunck_samples;
// prepare for the next stream to read
do {
avs->next_stream = (avs->next_stream+1) % avs->nb_streams;
} while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
return (res == S_OK) ? pkt->size : -1;
}
static int avisynth_read_close(AVFormatContext *s)
{
AVISynthContext *avs = s->priv_data;
int i;
for (i=0;i<avs->nb_streams;i++)
{
AVIStreamRelease(avs->streams[i].handle);
}
av_free(avs->streams);
AVIFileRelease(avs->file);
AVIFileExit();
return 0;
}
static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
{
AVISynthContext *avs = s->priv_data;
int stream_id;
for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
{
avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples;
}
return 0;
}
AVInputFormat avisynth_demuxer = {
"avs",
"AVISynth",
sizeof(AVISynthContext),
NULL,
avisynth_read_header,
avisynth_read_packet,
avisynth_read_close,
avisynth_read_seek,
NULL,
0,
"avs",
};
|
