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
  53   AVIFileInit();
  54
  55   res = AVIFileOpen(&avs->file, s->filename, OF_READ|OF_SHARE_DENY_WRITE, NULL);
  56   if (res != S_OK)
  57     {
  58       av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld", res);
  59       AVIFileExit();
  60       return -1;
  61     }
  62
  63   res = AVIFileInfo(avs->file, &info, sizeof(info));
  64   if (res != S_OK)
  65     {
  66       av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld", res);
  67       AVIFileExit();
  68       return -1;
  69     }
  70
  71   avs->streams = av_mallocz(info.dwStreams * sizeof(AVISynthStream));
  72
  73   for (id=0; id<info.dwStreams; id++)
  74     {
  75       stream = &avs->streams[id];
  76       stream->read = 0;
  77       if (AVIFileGetStream(avs->file, &stream->handle, 0, id) == S_OK)
  78         {
  79           if (AVIStreamInfo(stream->handle, &stream->info, sizeof(stream->info)) == S_OK)
  80             {
  81               if (stream->info.fccType == streamtypeAUDIO)
  82                 {
  83                   WAVEFORMATEX wvfmt;
  84                   LONG struct_size = sizeof(WAVEFORMATEX);
  85                   if (AVIStreamReadFormat(stream->handle, 0, &wvfmt, &struct_size) != S_OK)
  86                     continue;
  87
  88                   st = avformat_new_stream(s, NULL);
  89                   st->id = id;
  90                   st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  91
  92                   st->codec->block_align = wvfmt.nBlockAlign;
  93                   st->codec->channels = wvfmt.nChannels;
  94                   st->codec->sample_rate = wvfmt.nSamplesPerSec;
  95                   st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8;
  96                   st->codec->bits_per_coded_sample = wvfmt.wBitsPerSample;
  97
  98                   stream->chunck_samples = wvfmt.nSamplesPerSec * (uint64_t)info.dwScale / (uint64_t)info.dwRate;
  99                   stream->chunck_size = stream->chunck_samples * wvfmt.nChannels * wvfmt.wBitsPerSample / 8;
 100
 101                   st->codec->codec_tag = wvfmt.wFormatTag;
 102                   st->codec->codec_id = ff_wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_coded_sample);
 103                 }
 104               else if (stream->info.fccType == streamtypeVIDEO)
 105                 {
 106                   BITMAPINFO imgfmt;
 107                   LONG struct_size = sizeof(BITMAPINFO);
 108
 109                   stream->chunck_size = stream->info.dwSampleSize;
 110                   stream->chunck_samples = 1;
 111
 112                   if (AVIStreamReadFormat(stream->handle, 0, &imgfmt, &struct_size) != S_OK)
 113                     continue;
 114
 115                   st = avformat_new_stream(s, NULL);
 116                   st->id = id;
 117                   st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
 118                   st->r_frame_rate.num = stream->info.dwRate;
 119                   st->r_frame_rate.den = stream->info.dwScale;
 120
 121                   st->codec->width = imgfmt.bmiHeader.biWidth;
 122                   st->codec->height = imgfmt.bmiHeader.biHeight;
 123
 124                   st->codec->bits_per_coded_sample = imgfmt.bmiHeader.biBitCount;
 125                   st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale;
 126                   st->codec->codec_tag = imgfmt.bmiHeader.biCompression;
 127                   st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, imgfmt.bmiHeader.biCompression);
 128                   if (st->codec->codec_id == CODEC_ID_RAWVIDEO && imgfmt.bmiHeader.biCompression== BI_RGB) {
 129                     st->codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
 130                     if (st->codec->extradata) {
 131                       st->codec->extradata_size = 9;
 132                       memcpy(st->codec->extradata, "BottomUp", 9);
 133                     }
 134                   }
 135
 136
 137                   st->duration = stream->info.dwLength;
 138                 }
 139               else
 140                 {
 141                   AVIStreamRelease(stream->handle);
 142                   continue;
 143                 }
 144
 145               avs->nb_streams++;
 146
 147               st->codec->stream_codec_tag = stream->info.fccHandler;
 148
 149               avpriv_set_pts_info(st, 64, info.dwScale, info.dwRate);
 150               st->start_time = stream->info.dwStart;
 151             }
 152         }
 153     }
 154
 155   return 0;
 156 }
 157
 158 static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
 159 {
 160   AVISynthContext *avs = s->priv_data;
 161   HRESULT res;
 162   AVISynthStream *stream;
 163   int stream_id = avs->next_stream;
 164   LONG read_size;
 165
 166   // handle interleaving manually...
 167   stream = &avs->streams[stream_id];
 168
 169   if (stream->read >= stream->info.dwLength)
 170     return AVERROR(EIO);
 171
 172   if (av_new_packet(pkt, stream->chunck_size))
 173     return AVERROR(EIO);
 174   pkt->stream_index = stream_id;
 175   pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples;
 176
 177   res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL);
 178
 179   pkt->size = read_size;
 180
 181   stream->read += stream->chunck_samples;
 182
 183   // prepare for the next stream to read
 184   do {
 185     avs->next_stream = (avs->next_stream+1) % avs->nb_streams;
 186   } while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
 187
 188   return (res == S_OK) ? pkt->size : -1;
 189 }
 190
 191 static int avisynth_read_close(AVFormatContext *s)
 192 {
 193   AVISynthContext *avs = s->priv_data;
 194   int i;
 195
 196   for (i=0;i<avs->nb_streams;i++)
 197     {
 198       AVIStreamRelease(avs->streams[i].handle);
 199     }
 200
 201   av_free(avs->streams);
 202   AVIFileRelease(avs->file);
 203   AVIFileExit();
 204   return 0;
 205 }
 206
 207 static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 208 {
 209   AVISynthContext *avs = s->priv_data;
 210   int stream_id;
 211
 212   for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
 213     {
 214       avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples;
 215     }
 216
 217   return 0;
 218 }
 219
 220 AVInputFormat ff_avisynth_demuxer = {
 221     .name           = "avs",
 222     .long_name      = NULL_IF_CONFIG_SMALL("AVISynth"),
 223     .priv_data_size = sizeof(AVISynthContext),
 224     .read_header    = avisynth_read_header,
 225     .read_packet    = avisynth_read_packet,
 226     .read_close     = avisynth_read_close,
 227     .read_seek      = avisynth_read_seek,
 228     .extensions     = "avs",
 229 };