Libav
|
00001 /* 00002 * AVISynth support for ffmpeg system 00003 * Copyright (c) 2006 DivX, Inc. 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "avformat.h" 00023 #include "riff.h" 00024 00025 #include <windows.h> 00026 #include <vfw.h> 00027 00028 typedef struct { 00029 PAVISTREAM handle; 00030 AVISTREAMINFO info; 00031 DWORD read; 00032 LONG chunck_size; 00033 LONG chunck_samples; 00034 } AVISynthStream; 00035 00036 typedef struct { 00037 PAVIFILE file; 00038 AVISynthStream *streams; 00039 int nb_streams; 00040 int next_stream; 00041 } AVISynthContext; 00042 00043 static int avisynth_read_header(AVFormatContext *s, AVFormatParameters *ap) 00044 { 00045 AVISynthContext *avs = s->priv_data; 00046 HRESULT res; 00047 AVIFILEINFO info; 00048 DWORD id; 00049 AVStream *st; 00050 AVISynthStream *stream; 00051 00052 AVIFileInit(); 00053 00054 res = AVIFileOpen(&avs->file, s->filename, OF_READ|OF_SHARE_DENY_WRITE, NULL); 00055 if (res != S_OK) 00056 { 00057 av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld", res); 00058 AVIFileExit(); 00059 return -1; 00060 } 00061 00062 res = AVIFileInfo(avs->file, &info, sizeof(info)); 00063 if (res != S_OK) 00064 { 00065 av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld", res); 00066 AVIFileExit(); 00067 return -1; 00068 } 00069 00070 avs->streams = av_mallocz(info.dwStreams * sizeof(AVISynthStream)); 00071 00072 for (id=0; id<info.dwStreams; id++) 00073 { 00074 stream = &avs->streams[id]; 00075 stream->read = 0; 00076 if (AVIFileGetStream(avs->file, &stream->handle, 0, id) == S_OK) 00077 { 00078 if (AVIStreamInfo(stream->handle, &stream->info, sizeof(stream->info)) == S_OK) 00079 { 00080 if (stream->info.fccType == streamtypeAUDIO) 00081 { 00082 WAVEFORMATEX wvfmt; 00083 LONG struct_size = sizeof(WAVEFORMATEX); 00084 if (AVIStreamReadFormat(stream->handle, 0, &wvfmt, &struct_size) != S_OK) 00085 continue; 00086 00087 st = av_new_stream(s, id); 00088 st->codec->codec_type = AVMEDIA_TYPE_AUDIO; 00089 00090 st->codec->block_align = wvfmt.nBlockAlign; 00091 st->codec->channels = wvfmt.nChannels; 00092 st->codec->sample_rate = wvfmt.nSamplesPerSec; 00093 st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8; 00094 st->codec->bits_per_coded_sample = wvfmt.wBitsPerSample; 00095 00096 stream->chunck_samples = wvfmt.nSamplesPerSec * (uint64_t)info.dwScale / (uint64_t)info.dwRate; 00097 stream->chunck_size = stream->chunck_samples * wvfmt.nChannels * wvfmt.wBitsPerSample / 8; 00098 00099 st->codec->codec_tag = wvfmt.wFormatTag; 00100 st->codec->codec_id = ff_wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_coded_sample); 00101 } 00102 else if (stream->info.fccType == streamtypeVIDEO) 00103 { 00104 BITMAPINFO imgfmt; 00105 LONG struct_size = sizeof(BITMAPINFO); 00106 00107 stream->chunck_size = stream->info.dwSampleSize; 00108 stream->chunck_samples = 1; 00109 00110 if (AVIStreamReadFormat(stream->handle, 0, &imgfmt, &struct_size) != S_OK) 00111 continue; 00112 00113 st = av_new_stream(s, id); 00114 st->codec->codec_type = AVMEDIA_TYPE_VIDEO; 00115 st->r_frame_rate.num = stream->info.dwRate; 00116 st->r_frame_rate.den = stream->info.dwScale; 00117 00118 st->codec->width = imgfmt.bmiHeader.biWidth; 00119 st->codec->height = imgfmt.bmiHeader.biHeight; 00120 00121 st->codec->bits_per_coded_sample = imgfmt.bmiHeader.biBitCount; 00122 st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale; 00123 st->codec->codec_tag = imgfmt.bmiHeader.biCompression; 00124 st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, imgfmt.bmiHeader.biCompression); 00125 00126 st->duration = stream->info.dwLength; 00127 } 00128 else 00129 { 00130 AVIStreamRelease(stream->handle); 00131 continue; 00132 } 00133 00134 avs->nb_streams++; 00135 00136 st->codec->stream_codec_tag = stream->info.fccHandler; 00137 00138 av_set_pts_info(st, 64, info.dwScale, info.dwRate); 00139 st->start_time = stream->info.dwStart; 00140 } 00141 } 00142 } 00143 00144 return 0; 00145 } 00146 00147 static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt) 00148 { 00149 AVISynthContext *avs = s->priv_data; 00150 HRESULT res; 00151 AVISynthStream *stream; 00152 int stream_id = avs->next_stream; 00153 LONG read_size; 00154 00155 // handle interleaving manually... 00156 stream = &avs->streams[stream_id]; 00157 00158 if (stream->read >= stream->info.dwLength) 00159 return AVERROR(EIO); 00160 00161 if (av_new_packet(pkt, stream->chunck_size)) 00162 return AVERROR(EIO); 00163 pkt->stream_index = stream_id; 00164 pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples; 00165 00166 res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL); 00167 00168 pkt->pts = stream->read; 00169 pkt->size = read_size; 00170 00171 stream->read += stream->chunck_samples; 00172 00173 // prepare for the next stream to read 00174 do { 00175 avs->next_stream = (avs->next_stream+1) % avs->nb_streams; 00176 } while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL); 00177 00178 return (res == S_OK) ? pkt->size : -1; 00179 } 00180 00181 static int avisynth_read_close(AVFormatContext *s) 00182 { 00183 AVISynthContext *avs = s->priv_data; 00184 int i; 00185 00186 for (i=0;i<avs->nb_streams;i++) 00187 { 00188 AVIStreamRelease(avs->streams[i].handle); 00189 } 00190 00191 av_free(avs->streams); 00192 AVIFileRelease(avs->file); 00193 AVIFileExit(); 00194 return 0; 00195 } 00196 00197 static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags) 00198 { 00199 AVISynthContext *avs = s->priv_data; 00200 int stream_id; 00201 00202 for (stream_id = 0; stream_id < avs->nb_streams; stream_id++) 00203 { 00204 avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples; 00205 } 00206 00207 return 0; 00208 } 00209 00210 AVInputFormat avisynth_demuxer = { 00211 "avs", 00212 NULL_IF_CONFIG_SMALL("AVISynth"), 00213 sizeof(AVISynthContext), 00214 NULL, 00215 avisynth_read_header, 00216 avisynth_read_packet, 00217 avisynth_read_close, 00218 avisynth_read_seek, 00219 NULL, 00220 0, 00221 "avs", 00222 };