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avisynth.c
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1 /*
2  * AVISynth support
3  * Copyright (c) 2006 DivX, Inc.
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 #include "avformat.h"
23 #include "internal.h"
24 #include "riff.h"
25 
26 #include <windows.h>
27 #include <vfw.h>
28 
29 typedef struct {
30  PAVISTREAM handle;
31  AVISTREAMINFO info;
32  DWORD read;
36 
37 typedef struct {
38  PAVIFILE file;
43 
45 {
46  AVISynthContext *avs = s->priv_data;
47  HRESULT res;
48  AVIFILEINFO info;
49  DWORD id;
50  AVStream *st;
51  AVISynthStream *stream;
52  wchar_t filename_wchar[1024] = { 0 };
53  char filename_char[1024] = { 0 };
54 
55  AVIFileInit();
56 
57  /* avisynth can't accept UTF-8 filename */
58  MultiByteToWideChar(CP_UTF8, 0, s->filename, -1, filename_wchar, 1024);
59  WideCharToMultiByte(CP_THREAD_ACP, 0, filename_wchar, -1, filename_char, 1024, NULL, NULL);
60  res = AVIFileOpen(&avs->file, filename_char, OF_READ|OF_SHARE_DENY_WRITE, NULL);
61  if (res != S_OK)
62  {
63  av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld\n", res);
64  AVIFileExit();
65  return -1;
66  }
67 
68  res = AVIFileInfo(avs->file, &info, sizeof(info));
69  if (res != S_OK)
70  {
71  av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld\n", res);
72  AVIFileExit();
73  return -1;
74  }
75 
76  avs->streams = av_mallocz(info.dwStreams * sizeof(AVISynthStream));
77 
78  for (id=0; id<info.dwStreams; id++)
79  {
80  stream = &avs->streams[id];
81  stream->read = 0;
82  if (AVIFileGetStream(avs->file, &stream->handle, 0, id) == S_OK)
83  {
84  if (AVIStreamInfo(stream->handle, &stream->info, sizeof(stream->info)) == S_OK)
85  {
86  if (stream->info.fccType == streamtypeAUDIO)
87  {
88  WAVEFORMATEX wvfmt;
89  LONG struct_size = sizeof(WAVEFORMATEX);
90  if (AVIStreamReadFormat(stream->handle, 0, &wvfmt, &struct_size) != S_OK)
91  continue;
92 
93  st = avformat_new_stream(s, NULL);
94  st->id = id;
96 
97  st->codec->block_align = wvfmt.nBlockAlign;
98  st->codec->channels = wvfmt.nChannels;
99  st->codec->sample_rate = wvfmt.nSamplesPerSec;
100  st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8;
101  st->codec->bits_per_coded_sample = wvfmt.wBitsPerSample;
102 
103  stream->chunck_samples = wvfmt.nSamplesPerSec * (uint64_t)info.dwScale / (uint64_t)info.dwRate;
104  stream->chunck_size = stream->chunck_samples * wvfmt.nChannels * wvfmt.wBitsPerSample / 8;
105 
106  st->codec->codec_tag = wvfmt.wFormatTag;
107  st->codec->codec_id = ff_wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_coded_sample);
108  }
109  else if (stream->info.fccType == streamtypeVIDEO)
110  {
111  BITMAPINFO imgfmt;
112  LONG struct_size = sizeof(BITMAPINFO);
113 
114  stream->chunck_size = stream->info.dwSampleSize;
115  stream->chunck_samples = 1;
116 
117  if (AVIStreamReadFormat(stream->handle, 0, &imgfmt, &struct_size) != S_OK)
118  continue;
119 
120  st = avformat_new_stream(s, NULL);
121  st->id = id;
123  st->avg_frame_rate.num = stream->info.dwRate;
124  st->avg_frame_rate.den = stream->info.dwScale;
125 #if FF_API_R_FRAME_RATE
126  st->r_frame_rate = st->avg_frame_rate;
127 #endif
128 
129  st->codec->width = imgfmt.bmiHeader.biWidth;
130  st->codec->height = imgfmt.bmiHeader.biHeight;
131 
132  st->codec->bits_per_coded_sample = imgfmt.bmiHeader.biBitCount;
133  st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale;
134  st->codec->codec_tag = imgfmt.bmiHeader.biCompression;
135  st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, imgfmt.bmiHeader.biCompression);
136  if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && imgfmt.bmiHeader.biCompression== BI_RGB) {
138  if (st->codec->extradata) {
139  st->codec->extradata_size = 9;
140  memcpy(st->codec->extradata, "BottomUp", 9);
141  }
142  }
143 
144 
145  st->duration = stream->info.dwLength;
146  }
147  else
148  {
149  AVIStreamRelease(stream->handle);
150  continue;
151  }
152 
153  avs->nb_streams++;
154 
155  st->codec->stream_codec_tag = stream->info.fccHandler;
156 
157  avpriv_set_pts_info(st, 64, info.dwScale, info.dwRate);
158  st->start_time = stream->info.dwStart;
159  }
160  }
161  }
162 
163  return 0;
164 }
165 
167 {
168  AVISynthContext *avs = s->priv_data;
169  HRESULT res;
170  AVISynthStream *stream;
171  int stream_id = avs->next_stream;
172  LONG read_size;
173 
174  // handle interleaving manually...
175  stream = &avs->streams[stream_id];
176 
177  if (stream->read >= stream->info.dwLength)
178  return AVERROR(EIO);
179 
180  if (av_new_packet(pkt, stream->chunck_size))
181  return AVERROR(EIO);
182  pkt->stream_index = stream_id;
183  pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples;
184 
185  res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL);
186 
187  pkt->size = read_size;
188 
189  stream->read += stream->chunck_samples;
190 
191  // prepare for the next stream to read
192  do {
193  avs->next_stream = (avs->next_stream+1) % avs->nb_streams;
194  } while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
195 
196  return (res == S_OK) ? pkt->size : -1;
197 }
198 
200 {
201  AVISynthContext *avs = s->priv_data;
202  int i;
203 
204  for (i=0;i<avs->nb_streams;i++)
205  {
206  AVIStreamRelease(avs->streams[i].handle);
207  }
208 
209  av_free(avs->streams);
210  AVIFileRelease(avs->file);
211  AVIFileExit();
212  return 0;
213 }
214 
215 static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
216 {
217  AVISynthContext *avs = s->priv_data;
218  int stream_id;
219 
220  for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
221  {
222  avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples;
223  }
224 
225  return 0;
226 }
227 
229  .name = "avs",
230  .long_name = NULL_IF_CONFIG_SMALL("AVISynth"),
231  .priv_data_size = sizeof(AVISynthContext),
236  .extensions = "avs",
237 };