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9dc5607b GP |
1 | /* |
2 | * AVISynth support for ffmpeg system | |
3 | * Copyright (c) 2006 DivX, Inc. | |
4 | * | |
5 | * This library is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU Lesser General Public | |
7 | * License as published by the Free Software Foundation; either | |
8 | * version 2 of the License, or (at your option) any later version. | |
9 | * | |
10 | * This library is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * Lesser General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU Lesser General Public | |
16 | * License along with this library; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
19 | ||
20 | #include "avformat.h" | |
21 | #include "riff.h" | |
22 | ||
23 | #include <windows.h> | |
24 | #include <vfw.h> | |
25 | ||
26 | typedef struct { | |
27 | PAVISTREAM handle; | |
28 | AVISTREAMINFO info; | |
29 | DWORD read; | |
30 | LONG chunck_size; | |
31 | LONG chunck_samples; | |
32 | } AVISynthStream; | |
33 | ||
34 | typedef struct { | |
35 | PAVIFILE file; | |
36 | AVISynthStream *streams; | |
37 | int nb_streams; | |
38 | int next_stream; | |
39 | } AVISynthContext; | |
40 | ||
41 | static int avisynth_read_header(AVFormatContext *s, AVFormatParameters *ap) | |
42 | { | |
43 | AVISynthContext *avs = s->priv_data; | |
44 | HRESULT res; | |
45 | AVIFILEINFO info; | |
46 | DWORD id; | |
47 | AVStream *st; | |
48 | AVISynthStream *stream; | |
49 | ||
50 | AVIFileInit(); | |
51 | ||
52 | res = AVIFileOpen(&avs->file, s->filename, OF_READ|OF_SHARE_DENY_WRITE, NULL); | |
53 | if (res != S_OK) | |
54 | { | |
55 | av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld", res); | |
56 | AVIFileExit(); | |
57 | return -1; | |
58 | } | |
59 | ||
60 | res = AVIFileInfo(avs->file, &info, sizeof(info)); | |
61 | if (res != S_OK) | |
62 | { | |
63 | av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld", res); | |
64 | AVIFileExit(); | |
65 | return -1; | |
66 | } | |
67 | ||
68 | avs->streams = av_mallocz(info.dwStreams * sizeof(AVISynthStream)); | |
69 | ||
70 | for (id=0; id<info.dwStreams; id++) | |
71 | { | |
72 | stream = &avs->streams[id]; | |
73 | stream->read = 0; | |
74 | if (AVIFileGetStream(avs->file, &stream->handle, 0, id) == S_OK) | |
75 | { | |
76 | if (AVIStreamInfo(stream->handle, &stream->info, sizeof(stream->info)) == S_OK) | |
77 | { | |
78 | if (stream->info.fccType == streamtypeAUDIO) | |
79 | { | |
80 | WAVEFORMATEX wvfmt; | |
81 | LONG struct_size = sizeof(WAVEFORMATEX); | |
82 | if (AVIStreamReadFormat(stream->handle, 0, &wvfmt, &struct_size) != S_OK) | |
83 | continue; | |
84 | ||
85 | st = av_new_stream(s, id); | |
86 | st->codec->codec_type = CODEC_TYPE_AUDIO; | |
87 | ||
88 | st->codec->block_align = wvfmt.nBlockAlign; | |
89 | st->codec->channels = wvfmt.nChannels; | |
90 | st->codec->sample_rate = wvfmt.nSamplesPerSec; | |
91 | st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8; | |
92 | st->codec->bits_per_sample = wvfmt.wBitsPerSample; | |
93 | ||
94 | stream->chunck_samples = wvfmt.nSamplesPerSec * (uint64_t)info.dwScale / (uint64_t)info.dwRate; | |
95 | stream->chunck_size = stream->chunck_samples * wvfmt.nChannels * wvfmt.wBitsPerSample / 8; | |
96 | ||
97 | st->codec->codec_id = wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_sample); | |
98 | } | |
99 | else if (stream->info.fccType == streamtypeVIDEO) | |
100 | { | |
101 | BITMAPINFO imgfmt; | |
102 | LONG struct_size = sizeof(BITMAPINFO); | |
103 | ||
104 | stream->chunck_size = stream->info.dwSampleSize; | |
105 | stream->chunck_samples = 1; | |
106 | ||
107 | if (AVIStreamReadFormat(stream->handle, 0, &imgfmt, &struct_size) != S_OK) | |
108 | continue; | |
109 | ||
110 | st = av_new_stream(s, id); | |
111 | st->codec->codec_type = CODEC_TYPE_VIDEO; | |
112 | st->r_frame_rate.num = stream->info.dwRate; | |
113 | st->r_frame_rate.den = stream->info.dwScale; | |
114 | ||
115 | st->codec->width = imgfmt.bmiHeader.biWidth; | |
116 | st->codec->height = imgfmt.bmiHeader.biHeight; | |
117 | ||
118 | st->codec->bits_per_sample = stream->info.dwSampleSize * 8; | |
119 | st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale; | |
120 | st->codec->codec_id = codec_get_id(codec_bmp_tags, stream->info.fccHandler); | |
121 | ||
122 | st->duration = stream->info.dwLength; | |
123 | } | |
124 | else | |
125 | { | |
126 | AVIStreamRelease(stream->handle); | |
127 | continue; | |
128 | } | |
129 | ||
130 | avs->nb_streams++; | |
131 | st->codec->codec_tag = stream->info.fccHandler; | |
132 | ||
133 | st->codec->stream_codec_tag = stream->info.fccHandler; | |
134 | ||
135 | av_set_pts_info(st, 64, info.dwScale, info.dwRate); | |
136 | st->start_time = stream->info.dwStart; | |
137 | } | |
138 | } | |
139 | } | |
140 | ||
141 | return 0; | |
142 | } | |
143 | ||
144 | static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt) | |
145 | { | |
146 | AVISynthContext *avs = s->priv_data; | |
147 | HRESULT res; | |
148 | AVISynthStream *stream; | |
149 | int stream_id = avs->next_stream; | |
150 | LONG read_size; | |
151 | ||
152 | // handle interleaving manually... | |
153 | stream = &avs->streams[stream_id]; | |
154 | ||
155 | if (stream->read >= stream->info.dwLength) | |
156 | return AVERROR_IO; | |
157 | ||
158 | if (av_new_packet(pkt, stream->chunck_size)) | |
159 | return AVERROR_IO; | |
160 | pkt->stream_index = stream_id; | |
161 | pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples; | |
162 | ||
163 | res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL); | |
164 | ||
165 | pkt->pts = stream->read; | |
166 | pkt->size = read_size; | |
167 | ||
168 | stream->read += stream->chunck_samples; | |
169 | ||
170 | // prepare for the next stream to read | |
171 | do { | |
172 | avs->next_stream = (avs->next_stream+1) % avs->nb_streams; | |
173 | } while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL); | |
174 | ||
175 | return (res == S_OK) ? pkt->size : -1; | |
176 | } | |
177 | ||
178 | static int avisynth_read_close(AVFormatContext *s) | |
179 | { | |
180 | AVISynthContext *avs = s->priv_data; | |
181 | int i; | |
182 | ||
183 | for (i=0;i<avs->nb_streams;i++) | |
184 | { | |
185 | AVIStreamRelease(avs->streams[i].handle); | |
186 | } | |
187 | ||
188 | av_free(avs->streams); | |
189 | AVIFileRelease(avs->file); | |
190 | AVIFileExit(); | |
191 | return 0; | |
192 | } | |
193 | ||
194 | static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags) | |
195 | { | |
196 | AVISynthContext *avs = s->priv_data; | |
197 | int stream_id; | |
198 | ||
199 | for (stream_id = 0; stream_id < avs->nb_streams; stream_id++) | |
200 | { | |
201 | avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples; | |
202 | } | |
203 | ||
204 | return 0; | |
205 | } | |
206 | ||
207 | AVInputFormat avisynth_demuxer = { | |
208 | "avs", | |
209 | "AVISynth", | |
210 | sizeof(AVISynthContext), | |
211 | NULL, | |
212 | avisynth_read_header, | |
213 | avisynth_read_packet, | |
214 | avisynth_read_close, | |
215 | avisynth_read_seek, | |
216 | NULL, | |
217 | 0, | |
218 | "avs", | |
219 | }; |