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
  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
 129                   st->duration = stream->info.dwLength;
 130                 }
 131               else
 132                 {
 133                   AVIStreamRelease(stream->handle);
 134                   continue;
 135                 }
 136
 137               avs->nb_streams++;
 138
 139               st->codec->stream_codec_tag = stream->info.fccHandler;
 140
 141               avpriv_set_pts_info(st, 64, info.dwScale, info.dwRate);
 142               st->start_time = stream->info.dwStart;
 143             }
 144         }
 145     }
 146
 147   return 0;
 148 }
 149
 150 static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
 151 {
 152   AVISynthContext *avs = s->priv_data;
 153   HRESULT res;
 154   AVISynthStream *stream;
 155   int stream_id = avs->next_stream;
 156   LONG read_size;
 157
 158   // handle interleaving manually...
 159   stream = &avs->streams[stream_id];
 160
 161   if (stream->read >= stream->info.dwLength)
 162     return AVERROR(EIO);
 163
 164   if (av_new_packet(pkt, stream->chunck_size))
 165     return AVERROR(EIO);
 166   pkt->stream_index = stream_id;
 167   pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples;
 168
 169   res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL);
 170
 171   pkt->pts = stream->read;
 172   pkt->size = read_size;
 173
 174   stream->read += stream->chunck_samples;
 175
 176   // prepare for the next stream to read
 177   do {
 178     avs->next_stream = (avs->next_stream+1) % avs->nb_streams;
 179   } while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
 180
 181   return (res == S_OK) ? pkt->size : -1;
 182 }
 183
 184 static int avisynth_read_close(AVFormatContext *s)
 185 {
 186   AVISynthContext *avs = s->priv_data;
 187   int i;
 188
 189   for (i=0;i<avs->nb_streams;i++)
 190     {
 191       AVIStreamRelease(avs->streams[i].handle);
 192     }
 193
 194   av_free(avs->streams);
 195   AVIFileRelease(avs->file);
 196   AVIFileExit();
 197   return 0;
 198 }
 199
 200 static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 201 {
 202   AVISynthContext *avs = s->priv_data;
 203   int stream_id;
 204
 205   for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
 206     {
 207       avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples;
 208     }
 209
 210   return 0;
 211 }
 212
 213 AVInputFormat ff_avisynth_demuxer = {
 214     .name           = "avs",
 215     .long_name      = NULL_IF_CONFIG_SMALL("AVISynth"),
 216     .priv_data_size = sizeof(AVISynthContext),
 217     .read_header    = avisynth_read_header,
 218     .read_packet    = avisynth_read_packet,
 219     .read_close     = avisynth_read_close,
 220     .read_seek      = avisynth_read_seek,
 221     .extensions     = "avs",
 222 };