avisynth: K&R formatting cosmetics
[libav.git] / libavformat / avisynth.c
1 /*
2 * AviSynth support
3 * Copyright (c) 2006 DivX, Inc.
4 *
5 * This file is part of Libav.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 #include <windows.h>
23 #include <vfw.h>
24
25 #include "libavutil/internal.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "riff.h"
29
30 typedef struct {
31 PAVISTREAM handle;
32 AVISTREAMINFO info;
33 DWORD read;
34 LONG chunck_size;
35 LONG chunck_samples;
36 } AviSynthStream;
37
38 typedef struct {
39 PAVIFILE file;
40 AviSynthStream *streams;
41 int nb_streams;
42 int next_stream;
43 } AviSynthContext;
44
45 static int avisynth_read_header(AVFormatContext *s)
46 {
47 AviSynthContext *avs = s->priv_data;
48 HRESULT res;
49 AVIFILEINFO info;
50 DWORD id;
51 AVStream *st;
52 AviSynthStream *stream;
53 wchar_t filename_wchar[1024] = { 0 };
54 char filename_char[1024] = { 0 };
55
56 AVIFileInit();
57
58 /* AviSynth cannot accept UTF-8 file names. */
59 MultiByteToWideChar(CP_UTF8, 0, s->filename, -1, filename_wchar, 1024);
60 WideCharToMultiByte(CP_THREAD_ACP, 0, filename_wchar, -1, filename_char,
61 1024, NULL, NULL);
62 res = AVIFileOpen(&avs->file, filename_char,
63 OF_READ | OF_SHARE_DENY_WRITE, NULL);
64 if (res != S_OK) {
65 av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld", res);
66 AVIFileExit();
67 return -1;
68 }
69
70 res = AVIFileInfo(avs->file, &info, sizeof(info));
71 if (res != S_OK) {
72 av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld", res);
73 AVIFileExit();
74 return -1;
75 }
76
77 avs->streams = av_mallocz(info.dwStreams * sizeof(AviSynthStream));
78
79 for (id = 0; id < info.dwStreams; id++) {
80 stream = &avs->streams[id];
81 stream->read = 0;
82 if (AVIFileGetStream(avs->file, &stream->handle, 0, id) == S_OK &&
83 AVIStreamInfo(stream->handle, &stream->info,
84 sizeof(stream->info)) == S_OK) {
85 if (stream->info.fccType == streamtypeAUDIO) {
86 WAVEFORMATEX wvfmt;
87 LONG struct_size = sizeof(WAVEFORMATEX);
88 if (AVIStreamReadFormat(stream->handle, 0,
89 &wvfmt, &struct_size) != S_OK)
90 continue;
91
92 st = avformat_new_stream(s, NULL);
93 st->id = id;
94 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
95
96 st->codec->block_align = wvfmt.nBlockAlign;
97 st->codec->channels = wvfmt.nChannels;
98 st->codec->sample_rate = wvfmt.nSamplesPerSec;
99 st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8;
100 st->codec->bits_per_coded_sample = wvfmt.wBitsPerSample;
101
102 stream->chunck_samples = wvfmt.nSamplesPerSec *
103 (uint64_t)info.dwScale /
104 (uint64_t)info.dwRate;
105 stream->chunck_size = stream->chunck_samples *
106 wvfmt.nChannels *
107 wvfmt.wBitsPerSample / 8;
108
109 st->codec->codec_tag = wvfmt.wFormatTag;
110 st->codec->codec_id =
111 ff_wav_codec_get_id(wvfmt.wFormatTag,
112 st->codec->bits_per_coded_sample);
113 } else if (stream->info.fccType == streamtypeVIDEO) {
114 BITMAPINFO imgfmt;
115 LONG struct_size = sizeof(BITMAPINFO);
116
117 stream->chunck_size = stream->info.dwSampleSize;
118 stream->chunck_samples = 1;
119
120 if (AVIStreamReadFormat(stream->handle, 0, &imgfmt,
121 &struct_size) != S_OK)
122 continue;
123
124 st = avformat_new_stream(s, NULL);
125 st->id = id;
126 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
127 st->avg_frame_rate.num = stream->info.dwRate;
128 st->avg_frame_rate.den = stream->info.dwScale;
129
130 st->codec->width = imgfmt.bmiHeader.biWidth;
131 st->codec->height = imgfmt.bmiHeader.biHeight;
132
133 st->codec->bits_per_coded_sample = imgfmt.bmiHeader.biBitCount;
134 st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize *
135 (uint64_t)stream->info.dwRate * 8 /
136 (uint64_t)stream->info.dwScale;
137 st->codec->codec_tag = imgfmt.bmiHeader.biCompression;
138 st->codec->codec_id =
139 ff_codec_get_id(ff_codec_bmp_tags,
140 imgfmt.bmiHeader.biCompression);
141
142 st->duration = stream->info.dwLength;
143 } else {
144 AVIStreamRelease(stream->handle);
145 continue;
146 }
147
148 avs->nb_streams++;
149
150 st->codec->stream_codec_tag = stream->info.fccHandler;
151
152 avpriv_set_pts_info(st, 64, info.dwScale, info.dwRate);
153 st->start_time = stream->info.dwStart;
154 }
155 }
156
157 return 0;
158 }
159
160 static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
161 {
162 AviSynthContext *avs = s->priv_data;
163 HRESULT res;
164 AviSynthStream *stream;
165 int stream_id = avs->next_stream;
166 LONG read_size;
167
168 // handle interleaving manually...
169 stream = &avs->streams[stream_id];
170
171 if (stream->read >= stream->info.dwLength)
172 return AVERROR(EIO);
173
174 if (av_new_packet(pkt, stream->chunck_size))
175 return AVERROR(EIO);
176 pkt->stream_index = stream_id;
177 pkt->pts = avs->streams[stream_id].read /
178 avs->streams[stream_id].chunck_samples;
179
180 res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples,
181 pkt->data, stream->chunck_size, &read_size, NULL);
182
183 pkt->pts = stream->read;
184 pkt->size = read_size;
185
186 stream->read += stream->chunck_samples;
187
188 // prepare for the next stream to read
189 do
190 avs->next_stream = (avs->next_stream + 1) % avs->nb_streams;
191 while (avs->next_stream != stream_id &&
192 s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
193
194 return (res == S_OK) ? pkt->size : -1;
195 }
196
197 static int avisynth_read_close(AVFormatContext *s)
198 {
199 AviSynthContext *avs = s->priv_data;
200 int i;
201
202 for (i = 0; i < avs->nb_streams; i++)
203 AVIStreamRelease(avs->streams[i].handle);
204
205 av_free(avs->streams);
206 AVIFileRelease(avs->file);
207 AVIFileExit();
208 return 0;
209 }
210
211 static int avisynth_read_seek(AVFormatContext *s, int stream_index,
212 int64_t pts, int flags)
213 {
214 AviSynthContext *avs = s->priv_data;
215 int stream_id;
216
217 for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
218 avs->streams[stream_id].read =
219 pts * avs->streams[stream_id].chunck_samples;
220
221 return 0;
222 }
223
224 AVInputFormat ff_avisynth_demuxer = {
225 .name = "avisynth",
226 .long_name = NULL_IF_CONFIG_SMALL("AviSynth"),
227 .priv_data_size = sizeof(AviSynthContext),
228 .read_header = avisynth_read_header,
229 .read_packet = avisynth_read_packet,
230 .read_close = avisynth_read_close,
231 .read_seek = avisynth_read_seek,
232 .extensions = "avs",
233 };