libavformat/avisynth.c

   1 /*
   2  * AVISynth support for ffmpeg system
   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 = av_new_stream(s, id);
  88                   st->codec->codec_type = CODEC_TYPE_AUDIO;
  89
  90                   st->codec->block_align = wvfmt.nBlockAlign;
  91                   st->codec->channels = wvfmt.nChannels;
  92                   st->codec->sample_rate = wvfmt.nSamplesPerSec;
  93                   st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8;
  94                   st->codec->bits_per_coded_sample = wvfmt.wBitsPerSample;
  95
  96                   stream->chunck_samples = wvfmt.nSamplesPerSec * (uint64_t)info.dwScale / (uint64_t)info.dwRate;
  97                   stream->chunck_size = stream->chunck_samples * wvfmt.nChannels * wvfmt.wBitsPerSample / 8;
  98
  99                   st->codec->codec_tag = wvfmt.wFormatTag;
 100                   st->codec->codec_id = wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_coded_sample);
 101                 }
 102               else if (stream->info.fccType == streamtypeVIDEO)
 103                 {
 104                   BITMAPINFO imgfmt;
 105                   LONG struct_size = sizeof(BITMAPINFO);
 106
 107                   stream->chunck_size = stream->info.dwSampleSize;
 108                   stream->chunck_samples = 1;
 109
 110                   if (AVIStreamReadFormat(stream->handle, 0, &imgfmt, &struct_size) != S_OK)
 111                     continue;
 112
 113                   st = av_new_stream(s, id);
 114                   st->codec->codec_type = CODEC_TYPE_VIDEO;
 115                   st->r_frame_rate.num = stream->info.dwRate;
 116                   st->r_frame_rate.den = stream->info.dwScale;
 117
 118                   st->codec->width = imgfmt.bmiHeader.biWidth;
 119                   st->codec->height = imgfmt.bmiHeader.biHeight;
 120
 121                   st->codec->bits_per_coded_sample = imgfmt.bmiHeader.biBitCount;
 122                   st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale;
 123                   st->codec->codec_tag = imgfmt.bmiHeader.biCompression;
 124                   st->codec->codec_id = codec_get_id(codec_bmp_tags, imgfmt.bmiHeader.biCompression);
 125
 126                   st->duration = stream->info.dwLength;
 127                 }
 128               else
 129                 {
 130                   AVIStreamRelease(stream->handle);
 131                   continue;
 132                 }
 133
 134               avs->nb_streams++;
 135
 136               st->codec->stream_codec_tag = stream->info.fccHandler;
 137
 138               av_set_pts_info(st, 64, info.dwScale, info.dwRate);
 139               st->start_time = stream->info.dwStart;
 140             }
 141         }
 142     }
 143
 144   return 0;
 145 }
 146
 147 static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
 148 {
 149   AVISynthContext *avs = s->priv_data;
 150   HRESULT res;
 151   AVISynthStream *stream;
 152   int stream_id = avs->next_stream;
 153   LONG read_size;
 154
 155   // handle interleaving manually...
 156   stream = &avs->streams[stream_id];
 157
 158   if (stream->read >= stream->info.dwLength)
 159     return AVERROR(EIO);
 160
 161   if (av_new_packet(pkt, stream->chunck_size))
 162     return AVERROR(EIO);
 163   pkt->stream_index = stream_id;
 164   pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples;
 165
 166   res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL);
 167
 168   pkt->pts = stream->read;
 169   pkt->size = read_size;
 170
 171   stream->read += stream->chunck_samples;
 172
 173   // prepare for the next stream to read
 174   do {
 175     avs->next_stream = (avs->next_stream+1) % avs->nb_streams;
 176   } while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
 177
 178   return (res == S_OK) ? pkt->size : -1;
 179 }
 180
 181 static int avisynth_read_close(AVFormatContext *s)
 182 {
 183   AVISynthContext *avs = s->priv_data;
 184   int i;
 185
 186   for (i=0;i<avs->nb_streams;i++)
 187     {
 188       AVIStreamRelease(avs->streams[i].handle);
 189     }
 190
 191   av_free(avs->streams);
 192   AVIFileRelease(avs->file);
 193   AVIFileExit();
 194   return 0;
 195 }
 196
 197 static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
 198 {
 199   AVISynthContext *avs = s->priv_data;
 200   int stream_id;
 201
 202   for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
 203     {
 204       avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples;
 205     }
 206
 207   return 0;
 208 }
 209
 210 AVInputFormat avisynth_demuxer = {
 211   "avs",
 212   NULL_IF_CONFIG_SMALL("AVISynth"),
 213   sizeof(AVISynthContext),
 214   NULL,
 215   avisynth_read_header,
 216   avisynth_read_packet,
 217   avisynth_read_close,
 218   avisynth_read_seek,
 219   NULL,
 220   0,
 221   "avs",
 222 };