08679e5de7198563fa910507aa57fd91bc414209
[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 "libavutil/internal.h"
23 #include "avformat.h"
24 #include "internal.h"
25 #include "riff.h"
26
27 #include <windows.h>
28 #include <vfw.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, 1024, NULL, NULL);
61 res = AVIFileOpen(&avs->file, filename_char, OF_READ|OF_SHARE_DENY_WRITE, NULL);
62 if (res != S_OK)
63 {
64 av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld", res);
65 AVIFileExit();
66 return -1;
67 }
68
69 res = AVIFileInfo(avs->file, &info, sizeof(info));
70 if (res != S_OK)
71 {
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 {
81 stream = &avs->streams[id];
82 stream->read = 0;
83 if (AVIFileGetStream(avs->file, &stream->handle, 0, id) == S_OK)
84 {
85 if (AVIStreamInfo(stream->handle, &stream->info, sizeof(stream->info)) == S_OK)
86 {
87 if (stream->info.fccType == streamtypeAUDIO)
88 {
89 WAVEFORMATEX wvfmt;
90 LONG struct_size = sizeof(WAVEFORMATEX);
91 if (AVIStreamReadFormat(stream->handle, 0, &wvfmt, &struct_size) != S_OK)
92 continue;
93
94 st = avformat_new_stream(s, NULL);
95 st->id = id;
96 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
97
98 st->codec->block_align = wvfmt.nBlockAlign;
99 st->codec->channels = wvfmt.nChannels;
100 st->codec->sample_rate = wvfmt.nSamplesPerSec;
101 st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8;
102 st->codec->bits_per_coded_sample = wvfmt.wBitsPerSample;
103
104 stream->chunck_samples = wvfmt.nSamplesPerSec * (uint64_t)info.dwScale / (uint64_t)info.dwRate;
105 stream->chunck_size = stream->chunck_samples * wvfmt.nChannels * wvfmt.wBitsPerSample / 8;
106
107 st->codec->codec_tag = wvfmt.wFormatTag;
108 st->codec->codec_id = ff_wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_coded_sample);
109 }
110 else if (stream->info.fccType == streamtypeVIDEO)
111 {
112 BITMAPINFO imgfmt;
113 LONG struct_size = sizeof(BITMAPINFO);
114
115 stream->chunck_size = stream->info.dwSampleSize;
116 stream->chunck_samples = 1;
117
118 if (AVIStreamReadFormat(stream->handle, 0, &imgfmt, &struct_size) != S_OK)
119 continue;
120
121 st = avformat_new_stream(s, NULL);
122 st->id = id;
123 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
124 st->avg_frame_rate.num = stream->info.dwRate;
125 st->avg_frame_rate.den = stream->info.dwScale;
126
127 st->codec->width = imgfmt.bmiHeader.biWidth;
128 st->codec->height = imgfmt.bmiHeader.biHeight;
129
130 st->codec->bits_per_coded_sample = imgfmt.bmiHeader.biBitCount;
131 st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale;
132 st->codec->codec_tag = imgfmt.bmiHeader.biCompression;
133 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, imgfmt.bmiHeader.biCompression);
134
135 st->duration = stream->info.dwLength;
136 }
137 else
138 {
139 AVIStreamRelease(stream->handle);
140 continue;
141 }
142
143 avs->nb_streams++;
144
145 st->codec->stream_codec_tag = stream->info.fccHandler;
146
147 avpriv_set_pts_info(st, 64, info.dwScale, info.dwRate);
148 st->start_time = stream->info.dwStart;
149 }
150 }
151 }
152
153 return 0;
154 }
155
156 static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
157 {
158 AviSynthContext *avs = s->priv_data;
159 HRESULT res;
160 AviSynthStream *stream;
161 int stream_id = avs->next_stream;
162 LONG read_size;
163
164 // handle interleaving manually...
165 stream = &avs->streams[stream_id];
166
167 if (stream->read >= stream->info.dwLength)
168 return AVERROR(EIO);
169
170 if (av_new_packet(pkt, stream->chunck_size))
171 return AVERROR(EIO);
172 pkt->stream_index = stream_id;
173 pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples;
174
175 res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL);
176
177 pkt->pts = stream->read;
178 pkt->size = read_size;
179
180 stream->read += stream->chunck_samples;
181
182 // prepare for the next stream to read
183 do {
184 avs->next_stream = (avs->next_stream+1) % avs->nb_streams;
185 } while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
186
187 return (res == S_OK) ? pkt->size : -1;
188 }
189
190 static int avisynth_read_close(AVFormatContext *s)
191 {
192 AviSynthContext *avs = s->priv_data;
193 int i;
194
195 for (i=0;i<avs->nb_streams;i++)
196 {
197 AVIStreamRelease(avs->streams[i].handle);
198 }
199
200 av_free(avs->streams);
201 AVIFileRelease(avs->file);
202 AVIFileExit();
203 return 0;
204 }
205
206 static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
207 {
208 AviSynthContext *avs = s->priv_data;
209 int stream_id;
210
211 for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
212 {
213 avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples;
214 }
215
216 return 0;
217 }
218
219 AVInputFormat ff_avisynth_demuxer = {
220 .name = "avisynth",
221 .long_name = NULL_IF_CONFIG_SMALL("AviSynth"),
222 .priv_data_size = sizeof(AviSynthContext),
223 .read_header = avisynth_read_header,
224 .read_packet = avisynth_read_packet,
225 .read_close = avisynth_read_close,
226 .read_seek = avisynth_read_seek,
227 .extensions = "avs",
228 };