git.sesse.net Git - ffmpeg/blob - libavformat/avisynth.c

   1 /*
   2  * AVISynth support
   3  * Copyright (c) 2006 DivX, Inc.
   4  *
   5  * This file is part of Libav.
   6  *
   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.
  11  *
  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.
  16  *
  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
  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;
  33   LONG chunck_size;
  34   LONG chunck_samples;
  35 } AVISynthStream;
  36
  37 typedef struct {
  38   PAVIFILE file;
  39   AVISynthStream *streams;
  40   int nb_streams;
  41   int next_stream;
  42 } AVISynthContext;
  43
  44 static int avisynth_read_header(AVFormatContext *s)
  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", 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", 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;
  95                   st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  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;
 122                   st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
 123                   st->r_frame_rate.num = stream->info.dwRate;
 124                   st->r_frame_rate.den = stream->info.dwScale;
 125
 126                   st->codec->width = imgfmt.bmiHeader.biWidth;
 127                   st->codec->height = imgfmt.bmiHeader.biHeight;
 128
 129                   st->codec->bits_per_coded_sample = imgfmt.bmiHeader.biBitCount;
 130                   st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale;
 131                   st->codec->codec_tag = imgfmt.bmiHeader.biCompression;
 132                   st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, imgfmt.bmiHeader.biCompression);
 133
 134                   st->duration = stream->info.dwLength;
 135                 }
 136               else
 137                 {
 138                   AVIStreamRelease(stream->handle);
 139                   continue;
 140                 }
 141
 142               avs->nb_streams++;
 143
 144               st->codec->stream_codec_tag = stream->info.fccHandler;
 145
 146               avpriv_set_pts_info(st, 64, info.dwScale, info.dwRate);
 147               st->start_time = stream->info.dwStart;
 148             }
 149         }
 150     }
 151
 152   return 0;
 153 }
 154
 155 static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
 156 {
 157   AVISynthContext *avs = s->priv_data;
 158   HRESULT res;
 159   AVISynthStream *stream;
 160   int stream_id = avs->next_stream;
 161   LONG read_size;
 162
 163   // handle interleaving manually...
 164   stream = &avs->streams[stream_id];
 165
 166   if (stream->read >= stream->info.dwLength)
 167     return AVERROR(EIO);
 168
 169   if (av_new_packet(pkt, stream->chunck_size))
 170     return AVERROR(EIO);
 171   pkt->stream_index = stream_id;
 172   pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples;
 173
 174   res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL);
 175
 176   pkt->pts = stream->read;
 177   pkt->size = read_size;
 178
 179   stream->read += stream->chunck_samples;
 180
 181   // prepare for the next stream to read
 182   do {
 183     avs->next_stream = (avs->next_stream+1) % avs->nb_streams;
 184   } while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
 185
 186   return (res == S_OK) ? pkt->size : -1;
 187 }
 188
 189 static int avisynth_read_close(AVFormatContext *s)
 190 {
 191   AVISynthContext *avs = s->priv_data;
 192   int i;
 193
 194   for (i=0;i<avs->nb_streams;i++)
 195     {
 196       AVIStreamRelease(avs->streams[i].handle);
 197     }
 198
 199   av_free(avs->streams);
 200   AVIFileRelease(avs->file);
 201   AVIFileExit();
 202   return 0;
 203 }
 204
 205 static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 206 {
 207   AVISynthContext *avs = s->priv_data;
 208   int stream_id;
 209
 210   for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
 211     {
 212       avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples;
 213     }
 214
 215   return 0;
 216 }
 217
 218 AVInputFormat ff_avisynth_demuxer = {
 219     .name           = "avs",
 220     .long_name      = NULL_IF_CONFIG_SMALL("AVISynth"),
 221     .priv_data_size = sizeof(AVISynthContext),
 222     .read_header    = avisynth_read_header,
 223     .read_packet    = avisynth_read_packet,
 224     .read_close     = avisynth_read_close,
 225     .read_seek      = avisynth_read_seek,
 226     .extensions     = "avs",
 227 };