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 "riff.h"
  24
  25 #include <windows.h>
  26 #include <vfw.h>
  27
  28 typedef struct {
  29   PAVISTREAM handle;
  30   AVISTREAMINFO info;
  31   DWORD read;
  32   LONG chunck_size;
  33   LONG chunck_samples;
  34 } AVISynthStream;
  35
  36 typedef struct {
  37   PAVIFILE file;
  38   AVISynthStream *streams;
  39   int nb_streams;
  40   int next_stream;
  41 } AVISynthContext;
  42
  43 static int avisynth_read_header(AVFormatContext *s, AVFormatParameters *ap)
  44 {
  45   AVISynthContext *avs = s->priv_data;
  46   HRESULT res;
  47   AVIFILEINFO info;
  48   DWORD id;
  49   AVStream *st;
  50   AVISynthStream *stream;
  51
  52   AVIFileInit();
  53
  54   res = AVIFileOpen(&avs->file, s->filename, OF_READ|OF_SHARE_DENY_WRITE, NULL);
  55   if (res != S_OK)
  56     {
  57       av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld", res);
  58       AVIFileExit();
  59       return -1;
  60     }
  61
  62   res = AVIFileInfo(avs->file, &info, sizeof(info));
  63   if (res != S_OK)
  64     {
  65       av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld", res);
  66       AVIFileExit();
  67       return -1;
  68     }
  69
  70   avs->streams = av_mallocz(info.dwStreams * sizeof(AVISynthStream));
  71
  72   for (id=0; id<info.dwStreams; id++)
  73     {
  74       stream = &avs->streams[id];
  75       stream->read = 0;
  76       if (AVIFileGetStream(avs->file, &stream->handle, 0, id) == S_OK)
  77         {
  78           if (AVIStreamInfo(stream->handle, &stream->info, sizeof(stream->info)) == S_OK)
  79             {
  80               if (stream->info.fccType == streamtypeAUDIO)
  81                 {
  82                   WAVEFORMATEX wvfmt;
  83                   LONG struct_size = sizeof(WAVEFORMATEX);
  84                   if (AVIStreamReadFormat(stream->handle, 0, &wvfmt, &struct_size) != S_OK)
  85                     continue;
  86
  87                   st = avformat_new_stream(s, NULL);
  88                   st->id = id;
  89                   st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  90
  91                   st->codec->block_align = wvfmt.nBlockAlign;
  92                   st->codec->channels = wvfmt.nChannels;
  93                   st->codec->sample_rate = wvfmt.nSamplesPerSec;
  94                   st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8;
  95                   st->codec->bits_per_coded_sample = wvfmt.wBitsPerSample;
  96
  97                   stream->chunck_samples = wvfmt.nSamplesPerSec * (uint64_t)info.dwScale / (uint64_t)info.dwRate;
  98                   stream->chunck_size = stream->chunck_samples * wvfmt.nChannels * wvfmt.wBitsPerSample / 8;
  99
 100                   st->codec->codec_tag = wvfmt.wFormatTag;
 101                   st->codec->codec_id = ff_wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_coded_sample);
 102                 }
 103               else if (stream->info.fccType == streamtypeVIDEO)
 104                 {
 105                   BITMAPINFO imgfmt;
 106                   LONG struct_size = sizeof(BITMAPINFO);
 107
 108                   stream->chunck_size = stream->info.dwSampleSize;
 109                   stream->chunck_samples = 1;
 110
 111                   if (AVIStreamReadFormat(stream->handle, 0, &imgfmt, &struct_size) != S_OK)
 112                     continue;
 113
 114                   st = avformat_new_stream(s, NULL);
 115                   st->id = id;
 116                   st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
 117                   st->r_frame_rate.num = stream->info.dwRate;
 118                   st->r_frame_rate.den = stream->info.dwScale;
 119
 120                   st->codec->width = imgfmt.bmiHeader.biWidth;
 121                   st->codec->height = imgfmt.bmiHeader.biHeight;
 122
 123                   st->codec->bits_per_coded_sample = imgfmt.bmiHeader.biBitCount;
 124                   st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale;
 125                   st->codec->codec_tag = imgfmt.bmiHeader.biCompression;
 126                   st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, imgfmt.bmiHeader.biCompression);
 127                   if (st->codec->codec_id == CODEC_ID_RAWVIDEO && imgfmt.bmiHeader.biCompression== BI_RGB) {
 128                     st->codec->extradata = av_malloc(9 + FF_INPUT_BUFFER_PADDING_SIZE);
 129                     if (st->codec->extradata) {
 130                       st->codec->extradata_size = 9;
 131                       memcpy(st->codec->extradata, "BottomUp", 9);
 132                     }
 133                   }
 134
 135
 136                   st->duration = stream->info.dwLength;
 137                 }
 138               else
 139                 {
 140                   AVIStreamRelease(stream->handle);
 141                   continue;
 142                 }
 143
 144               avs->nb_streams++;
 145
 146               st->codec->stream_codec_tag = stream->info.fccHandler;
 147
 148               av_set_pts_info(st, 64, info.dwScale, info.dwRate);
 149               st->start_time = stream->info.dwStart;
 150             }
 151         }
 152     }
 153
 154   return 0;
 155 }
 156
 157 static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
 158 {
 159   AVISynthContext *avs = s->priv_data;
 160   HRESULT res;
 161   AVISynthStream *stream;
 162   int stream_id = avs->next_stream;
 163   LONG read_size;
 164
 165   // handle interleaving manually...
 166   stream = &avs->streams[stream_id];
 167
 168   if (stream->read >= stream->info.dwLength)
 169     return AVERROR(EIO);
 170
 171   if (av_new_packet(pkt, stream->chunck_size))
 172     return AVERROR(EIO);
 173   pkt->stream_index = stream_id;
 174   pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples;
 175
 176   res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL);
 177
 178   pkt->size = read_size;
 179
 180   stream->read += stream->chunck_samples;
 181
 182   // prepare for the next stream to read
 183   do {
 184     avs->next_stream = (avs->next_stream+1) % avs->nb_streams;
 185   } while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
 186
 187   return (res == S_OK) ? pkt->size : -1;
 188 }
 189
 190 static int avisynth_read_close(AVFormatContext *s)
 191 {
 192   AVISynthContext *avs = s->priv_data;
 193   int i;
 194
 195   for (i=0;i<avs->nb_streams;i++)
 196     {
 197       AVIStreamRelease(avs->streams[i].handle);
 198     }
 199
 200   av_free(avs->streams);
 201   AVIFileRelease(avs->file);
 202   AVIFileExit();
 203   return 0;
 204 }
 205
 206 static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 207 {
 208   AVISynthContext *avs = s->priv_data;
 209   int stream_id;
 210
 211   for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
 212     {
 213       avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples;
 214     }
 215
 216   return 0;
 217 }
 218
 219 AVInputFormat ff_avisynth_demuxer = {
 220     .name           = "avs",
 221     .long_name      = NULL_IF_CONFIG_SMALL("AVISynth"),
 222     .priv_data_size = sizeof(AVISynthContext),
 223     .read_header    = avisynth_read_header,
 224     .read_packet    = avisynth_read_packet,
 225     .read_close     = avisynth_read_close,
 226     .read_seek      = avisynth_read_seek,
 227     .extensions     = "avs",
 228 };