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 FFmpeg.
   6  *
   7  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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\n", 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\n", 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->avg_frame_rate.num = stream->info.dwRate;
 124                   st->avg_frame_rate.den = stream->info.dwScale;
 125 #if FF_API_R_FRAME_RATE
 126                   st->r_frame_rate = st->avg_frame_rate;
 127 #endif
 128
 129                   st->codec->width = imgfmt.bmiHeader.biWidth;
 130                   st->codec->height = imgfmt.bmiHeader.biHeight;
 131
 132                   st->codec->bits_per_coded_sample = imgfmt.bmiHeader.biBitCount;
 133                   st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale;
 134                   st->codec->codec_tag = imgfmt.bmiHeader.biCompression;
 135                   st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, imgfmt.bmiHeader.biCompression);
 136                   if (st->codec->codec_id == AV_CODEC_ID_RAWVIDEO && imgfmt.bmiHeader.biCompression== BI_RGB) {
 137                     st->codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
 138                     if (st->codec->extradata) {
 139                       st->codec->extradata_size = 9;
 140                       memcpy(st->codec->extradata, "BottomUp", 9);
 141                     }
 142                   }
 143
 144
 145                   st->duration = stream->info.dwLength;
 146                 }
 147               else
 148                 {
 149                   AVIStreamRelease(stream->handle);
 150                   continue;
 151                 }
 152
 153               avs->nb_streams++;
 154
 155               st->codec->stream_codec_tag = stream->info.fccHandler;
 156
 157               avpriv_set_pts_info(st, 64, info.dwScale, info.dwRate);
 158               st->start_time = stream->info.dwStart;
 159             }
 160         }
 161     }
 162
 163   return 0;
 164 }
 165
 166 static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
 167 {
 168   AVISynthContext *avs = s->priv_data;
 169   HRESULT res;
 170   AVISynthStream *stream;
 171   int stream_id = avs->next_stream;
 172   LONG read_size;
 173
 174   // handle interleaving manually...
 175   stream = &avs->streams[stream_id];
 176
 177   if (stream->read >= stream->info.dwLength)
 178     return AVERROR(EIO);
 179
 180   if (av_new_packet(pkt, stream->chunck_size))
 181     return AVERROR(EIO);
 182   pkt->stream_index = stream_id;
 183   pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples;
 184
 185   res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL);
 186
 187   pkt->size = read_size;
 188
 189   stream->read += stream->chunck_samples;
 190
 191   // prepare for the next stream to read
 192   do {
 193     avs->next_stream = (avs->next_stream+1) % avs->nb_streams;
 194   } while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
 195
 196   return (res == S_OK) ? pkt->size : -1;
 197 }
 198
 199 static int avisynth_read_close(AVFormatContext *s)
 200 {
 201   AVISynthContext *avs = s->priv_data;
 202   int i;
 203
 204   for (i=0;i<avs->nb_streams;i++)
 205     {
 206       AVIStreamRelease(avs->streams[i].handle);
 207     }
 208
 209   av_free(avs->streams);
 210   AVIFileRelease(avs->file);
 211   AVIFileExit();
 212   return 0;
 213 }
 214
 215 static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 216 {
 217   AVISynthContext *avs = s->priv_data;
 218   int stream_id;
 219
 220   for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
 221     {
 222       avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples;
 223     }
 224
 225   return 0;
 226 }
 227
 228 AVInputFormat ff_avisynth_demuxer = {
 229     .name           = "avs",
 230     .long_name      = NULL_IF_CONFIG_SMALL("AVISynth"),
 231     .priv_data_size = sizeof(AVISynthContext),
 232     .read_header    = avisynth_read_header,
 233     .read_packet    = avisynth_read_packet,
 234     .read_close     = avisynth_read_close,
 235     .read_seek      = avisynth_read_seek,
 236     .extensions     = "avs",
 237 };