2 * AVISynth support for ffmpeg system
3 * Copyright (c) 2006 DivX, Inc.
5 * This file is part of Libav.
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.
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.
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
38 AVISynthStream *streams;
43 static int avisynth_read_header(AVFormatContext *s, AVFormatParameters *ap)
45 AVISynthContext *avs = s->priv_data;
50 AVISynthStream *stream;
54 res = AVIFileOpen(&avs->file, s->filename, OF_READ|OF_SHARE_DENY_WRITE, NULL);
57 av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld", res);
62 res = AVIFileInfo(avs->file, &info, sizeof(info));
65 av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld", res);
70 avs->streams = av_mallocz(info.dwStreams * sizeof(AVISynthStream));
72 for (id=0; id<info.dwStreams; id++)
74 stream = &avs->streams[id];
76 if (AVIFileGetStream(avs->file, &stream->handle, 0, id) == S_OK)
78 if (AVIStreamInfo(stream->handle, &stream->info, sizeof(stream->info)) == S_OK)
80 if (stream->info.fccType == streamtypeAUDIO)
83 LONG struct_size = sizeof(WAVEFORMATEX);
84 if (AVIStreamReadFormat(stream->handle, 0, &wvfmt, &struct_size) != S_OK)
87 st = avformat_new_stream(s, NULL);
89 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
91 st->codec->block_align = wvfmt.nBlockAlign;
92 st->codec->channels = wvfmt.nChannels;
93 st->codec->sample_rate = wvfmt.nSamplesPerSec;
94 st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8;
95 st->codec->bits_per_coded_sample = wvfmt.wBitsPerSample;
97 stream->chunck_samples = wvfmt.nSamplesPerSec * (uint64_t)info.dwScale / (uint64_t)info.dwRate;
98 stream->chunck_size = stream->chunck_samples * wvfmt.nChannels * wvfmt.wBitsPerSample / 8;
100 st->codec->codec_tag = wvfmt.wFormatTag;
101 st->codec->codec_id = ff_wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_coded_sample);
103 else if (stream->info.fccType == streamtypeVIDEO)
106 LONG struct_size = sizeof(BITMAPINFO);
108 stream->chunck_size = stream->info.dwSampleSize;
109 stream->chunck_samples = 1;
111 if (AVIStreamReadFormat(stream->handle, 0, &imgfmt, &struct_size) != S_OK)
114 st = avformat_new_stream(s, NULL);
116 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
117 st->r_frame_rate.num = stream->info.dwRate;
118 st->r_frame_rate.den = stream->info.dwScale;
120 st->codec->width = imgfmt.bmiHeader.biWidth;
121 st->codec->height = imgfmt.bmiHeader.biHeight;
123 st->codec->bits_per_coded_sample = imgfmt.bmiHeader.biBitCount;
124 st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale;
125 st->codec->codec_tag = imgfmt.bmiHeader.biCompression;
126 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, imgfmt.bmiHeader.biCompression);
128 st->duration = stream->info.dwLength;
132 AVIStreamRelease(stream->handle);
138 st->codec->stream_codec_tag = stream->info.fccHandler;
140 av_set_pts_info(st, 64, info.dwScale, info.dwRate);
141 st->start_time = stream->info.dwStart;
149 static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
151 AVISynthContext *avs = s->priv_data;
153 AVISynthStream *stream;
154 int stream_id = avs->next_stream;
157 // handle interleaving manually...
158 stream = &avs->streams[stream_id];
160 if (stream->read >= stream->info.dwLength)
163 if (av_new_packet(pkt, stream->chunck_size))
165 pkt->stream_index = stream_id;
166 pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples;
168 res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL);
170 pkt->pts = stream->read;
171 pkt->size = read_size;
173 stream->read += stream->chunck_samples;
175 // prepare for the next stream to read
177 avs->next_stream = (avs->next_stream+1) % avs->nb_streams;
178 } while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
180 return (res == S_OK) ? pkt->size : -1;
183 static int avisynth_read_close(AVFormatContext *s)
185 AVISynthContext *avs = s->priv_data;
188 for (i=0;i<avs->nb_streams;i++)
190 AVIStreamRelease(avs->streams[i].handle);
193 av_free(avs->streams);
194 AVIFileRelease(avs->file);
199 static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
201 AVISynthContext *avs = s->priv_data;
204 for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
206 avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples;
212 AVInputFormat ff_avisynth_demuxer = {
214 .long_name = NULL_IF_CONFIG_SMALL("AVISynth"),
215 .priv_data_size = sizeof(AVISynthContext),
216 .read_header = avisynth_read_header,
217 .read_packet = avisynth_read_packet,
218 .read_close = avisynth_read_close,
219 .read_seek = avisynth_read_seek,