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libavformat/avisynth.c

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00001 /*
00002  * AVISynth support
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 "internal.h"
00024 #include "riff.h"
00025 
00026 #include <windows.h>
00027 #include <vfw.h>
00028 
00029 typedef struct {
00030   PAVISTREAM handle;
00031   AVISTREAMINFO info;
00032   DWORD read;
00033   LONG chunck_size;
00034   LONG chunck_samples;
00035 } AVISynthStream;
00036 
00037 typedef struct {
00038   PAVIFILE file;
00039   AVISynthStream *streams;
00040   int nb_streams;
00041   int next_stream;
00042 } AVISynthContext;
00043 
00044 static int avisynth_read_header(AVFormatContext *s, AVFormatParameters *ap)
00045 {
00046   AVISynthContext *avs = s->priv_data;
00047   HRESULT res;
00048   AVIFILEINFO info;
00049   DWORD id;
00050   AVStream *st;
00051   AVISynthStream *stream;
00052 
00053   AVIFileInit();
00054 
00055   res = AVIFileOpen(&avs->file, s->filename, OF_READ|OF_SHARE_DENY_WRITE, NULL);
00056   if (res != S_OK)
00057     {
00058       av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld", res);
00059       AVIFileExit();
00060       return -1;
00061     }
00062 
00063   res = AVIFileInfo(avs->file, &info, sizeof(info));
00064   if (res != S_OK)
00065     {
00066       av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld", res);
00067       AVIFileExit();
00068       return -1;
00069     }
00070 
00071   avs->streams = av_mallocz(info.dwStreams * sizeof(AVISynthStream));
00072 
00073   for (id=0; id<info.dwStreams; id++)
00074     {
00075       stream = &avs->streams[id];
00076       stream->read = 0;
00077       if (AVIFileGetStream(avs->file, &stream->handle, 0, id) == S_OK)
00078         {
00079           if (AVIStreamInfo(stream->handle, &stream->info, sizeof(stream->info)) == S_OK)
00080             {
00081               if (stream->info.fccType == streamtypeAUDIO)
00082                 {
00083                   WAVEFORMATEX wvfmt;
00084                   LONG struct_size = sizeof(WAVEFORMATEX);
00085                   if (AVIStreamReadFormat(stream->handle, 0, &wvfmt, &struct_size) != S_OK)
00086                     continue;
00087 
00088                   st = avformat_new_stream(s, NULL);
00089                   st->id = id;
00090                   st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00091 
00092                   st->codec->block_align = wvfmt.nBlockAlign;
00093                   st->codec->channels = wvfmt.nChannels;
00094                   st->codec->sample_rate = wvfmt.nSamplesPerSec;
00095                   st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8;
00096                   st->codec->bits_per_coded_sample = wvfmt.wBitsPerSample;
00097 
00098                   stream->chunck_samples = wvfmt.nSamplesPerSec * (uint64_t)info.dwScale / (uint64_t)info.dwRate;
00099                   stream->chunck_size = stream->chunck_samples * wvfmt.nChannels * wvfmt.wBitsPerSample / 8;
00100 
00101                   st->codec->codec_tag = wvfmt.wFormatTag;
00102                   st->codec->codec_id = ff_wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_coded_sample);
00103                 }
00104               else if (stream->info.fccType == streamtypeVIDEO)
00105                 {
00106                   BITMAPINFO imgfmt;
00107                   LONG struct_size = sizeof(BITMAPINFO);
00108 
00109                   stream->chunck_size = stream->info.dwSampleSize;
00110                   stream->chunck_samples = 1;
00111 
00112                   if (AVIStreamReadFormat(stream->handle, 0, &imgfmt, &struct_size) != S_OK)
00113                     continue;
00114 
00115                   st = avformat_new_stream(s, NULL);
00116                   st->id = id;
00117                   st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00118                   st->r_frame_rate.num = stream->info.dwRate;
00119                   st->r_frame_rate.den = stream->info.dwScale;
00120 
00121                   st->codec->width = imgfmt.bmiHeader.biWidth;
00122                   st->codec->height = imgfmt.bmiHeader.biHeight;
00123 
00124                   st->codec->bits_per_coded_sample = imgfmt.bmiHeader.biBitCount;
00125                   st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale;
00126                   st->codec->codec_tag = imgfmt.bmiHeader.biCompression;
00127                   st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, imgfmt.bmiHeader.biCompression);
00128                   if (st->codec->codec_id == CODEC_ID_RAWVIDEO && imgfmt.bmiHeader.biCompression== BI_RGB) {
00129                     st->codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
00130                     if (st->codec->extradata) {
00131                       st->codec->extradata_size = 9;
00132                       memcpy(st->codec->extradata, "BottomUp", 9);
00133                     }
00134                   }
00135 
00136 
00137                   st->duration = stream->info.dwLength;
00138                 }
00139               else
00140                 {
00141                   AVIStreamRelease(stream->handle);
00142                   continue;
00143                 }
00144 
00145               avs->nb_streams++;
00146 
00147               st->codec->stream_codec_tag = stream->info.fccHandler;
00148 
00149               avpriv_set_pts_info(st, 64, info.dwScale, info.dwRate);
00150               st->start_time = stream->info.dwStart;
00151             }
00152         }
00153     }
00154 
00155   return 0;
00156 }
00157 
00158 static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
00159 {
00160   AVISynthContext *avs = s->priv_data;
00161   HRESULT res;
00162   AVISynthStream *stream;
00163   int stream_id = avs->next_stream;
00164   LONG read_size;
00165 
00166   // handle interleaving manually...
00167   stream = &avs->streams[stream_id];
00168 
00169   if (stream->read >= stream->info.dwLength)
00170     return AVERROR(EIO);
00171 
00172   if (av_new_packet(pkt, stream->chunck_size))
00173     return AVERROR(EIO);
00174   pkt->stream_index = stream_id;
00175   pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples;
00176 
00177   res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL);
00178 
00179   pkt->size = read_size;
00180 
00181   stream->read += stream->chunck_samples;
00182 
00183   // prepare for the next stream to read
00184   do {
00185     avs->next_stream = (avs->next_stream+1) % avs->nb_streams;
00186   } while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
00187 
00188   return (res == S_OK) ? pkt->size : -1;
00189 }
00190 
00191 static int avisynth_read_close(AVFormatContext *s)
00192 {
00193   AVISynthContext *avs = s->priv_data;
00194   int i;
00195 
00196   for (i=0;i<avs->nb_streams;i++)
00197     {
00198       AVIStreamRelease(avs->streams[i].handle);
00199     }
00200 
00201   av_free(avs->streams);
00202   AVIFileRelease(avs->file);
00203   AVIFileExit();
00204   return 0;
00205 }
00206 
00207 static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
00208 {
00209   AVISynthContext *avs = s->priv_data;
00210   int stream_id;
00211 
00212   for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
00213     {
00214       avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples;
00215     }
00216 
00217   return 0;
00218 }
00219 
00220 AVInputFormat ff_avisynth_demuxer = {
00221     .name           = "avs",
00222     .long_name      = NULL_IF_CONFIG_SMALL("AVISynth"),
00223     .priv_data_size = sizeof(AVISynthContext),
00224     .read_header    = avisynth_read_header,
00225     .read_packet    = avisynth_read_packet,
00226     .read_close     = avisynth_read_close,
00227     .read_seek      = avisynth_read_seek,
00228     .extensions     = "avs",
00229 };
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