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ffmpeg / libavformat / avisynth.c @ 3abe5fbd

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/*
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 * AVISynth support for ffmpeg system
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 * Copyright (c) 2006 DivX, Inc.
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "avformat.h"
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#include "riff.h"
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#include <windows.h>
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#include <vfw.h>
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typedef struct {
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  PAVISTREAM handle;
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  AVISTREAMINFO info;
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  DWORD read;
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  LONG chunck_size;
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  LONG chunck_samples;
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} AVISynthStream;
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typedef struct {
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  PAVIFILE file;
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  AVISynthStream *streams;
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  int nb_streams;
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  int next_stream;
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} AVISynthContext;
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static int avisynth_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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  AVISynthContext *avs = s->priv_data;
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  HRESULT res;
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  AVIFILEINFO info;
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  DWORD id;
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  AVStream *st;
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  AVISynthStream *stream;
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  AVIFileInit();
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  res = AVIFileOpen(&avs->file, s->filename, OF_READ|OF_SHARE_DENY_WRITE, NULL);
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  if (res != S_OK)
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    {
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      av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld", res);
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      AVIFileExit();
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      return -1;
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    }
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  res = AVIFileInfo(avs->file, &info, sizeof(info));
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  if (res != S_OK)
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    {
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      av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld", res);
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      AVIFileExit();
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      return -1;
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    }
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  avs->streams = av_mallocz(info.dwStreams * sizeof(AVISynthStream));
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  for (id=0; id<info.dwStreams; id++)
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    {
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      stream = &avs->streams[id];
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      stream->read = 0;
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      if (AVIFileGetStream(avs->file, &stream->handle, 0, id) == S_OK)
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        {
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          if (AVIStreamInfo(stream->handle, &stream->info, sizeof(stream->info)) == S_OK)
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            {
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              if (stream->info.fccType == streamtypeAUDIO)
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                {
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                  WAVEFORMATEX wvfmt;
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                  LONG struct_size = sizeof(WAVEFORMATEX);
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                  if (AVIStreamReadFormat(stream->handle, 0, &wvfmt, &struct_size) != S_OK)
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                    continue;
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                  st = av_new_stream(s, id);
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                  st->codec->codec_type = CODEC_TYPE_AUDIO;
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                  st->codec->block_align = wvfmt.nBlockAlign;
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                  st->codec->channels = wvfmt.nChannels;
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                  st->codec->sample_rate = wvfmt.nSamplesPerSec;
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                  st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8;
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                  st->codec->bits_per_sample = wvfmt.wBitsPerSample;
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                  stream->chunck_samples = wvfmt.nSamplesPerSec * (uint64_t)info.dwScale / (uint64_t)info.dwRate;
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                  stream->chunck_size = stream->chunck_samples * wvfmt.nChannels * wvfmt.wBitsPerSample / 8;
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                  st->codec->codec_tag = wvfmt.wFormatTag;
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                  st->codec->codec_id = wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_sample);
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                }
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              else if (stream->info.fccType == streamtypeVIDEO)
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                {
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                  BITMAPINFO imgfmt;
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                  LONG struct_size = sizeof(BITMAPINFO);
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                  stream->chunck_size = stream->info.dwSampleSize;
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                  stream->chunck_samples = 1;
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                  if (AVIStreamReadFormat(stream->handle, 0, &imgfmt, &struct_size) != S_OK)
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                    continue;
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                  st = av_new_stream(s, id);
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                  st->codec->codec_type = CODEC_TYPE_VIDEO;
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                  st->r_frame_rate.num = stream->info.dwRate;
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                  st->r_frame_rate.den = stream->info.dwScale;
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                  st->codec->width = imgfmt.bmiHeader.biWidth;
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                  st->codec->height = imgfmt.bmiHeader.biHeight;
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                  st->codec->bits_per_sample = imgfmt.bmiHeader.biBitCount;
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                  st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale;
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                  st->codec->codec_tag = imgfmt.bmiHeader.biCompression;
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                  st->codec->codec_id = codec_get_id(codec_bmp_tags, imgfmt.bmiHeader.biCompression);
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                  st->duration = stream->info.dwLength;
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                }
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              else
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                {
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                  AVIStreamRelease(stream->handle);
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                  continue;
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                }
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              avs->nb_streams++;
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              st->codec->stream_codec_tag = stream->info.fccHandler;
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              av_set_pts_info(st, 64, info.dwScale, info.dwRate);
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              st->start_time = stream->info.dwStart;
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            }
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        }
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    }
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  return 0;
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}
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static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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  AVISynthContext *avs = s->priv_data;
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  HRESULT res;
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  AVISynthStream *stream;
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  int stream_id = avs->next_stream;
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  LONG read_size;
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  // handle interleaving manually...
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  stream = &avs->streams[stream_id];
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  if (stream->read >= stream->info.dwLength)
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    return AVERROR(EIO);
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  if (av_new_packet(pkt, stream->chunck_size))
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    return AVERROR(EIO);
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  pkt->stream_index = stream_id;
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  pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples;
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  res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL);
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  pkt->pts = stream->read;
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  pkt->size = read_size;
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  stream->read += stream->chunck_samples;
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  // prepare for the next stream to read
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  do {
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    avs->next_stream = (avs->next_stream+1) % avs->nb_streams;
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  } while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
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  return (res == S_OK) ? pkt->size : -1;
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}
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static int avisynth_read_close(AVFormatContext *s)
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{
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  AVISynthContext *avs = s->priv_data;
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  int i;
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  for (i=0;i<avs->nb_streams;i++)
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    {
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      AVIStreamRelease(avs->streams[i].handle);
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    }
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  av_free(avs->streams);
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  AVIFileRelease(avs->file);
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  AVIFileExit();
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  return 0;
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}
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static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
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{
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  AVISynthContext *avs = s->priv_data;
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  int stream_id;
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  for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
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    {
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      avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples;
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    }
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  return 0;
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}
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AVInputFormat avisynth_demuxer = {
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  "avs",
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  "AVISynth",
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  sizeof(AVISynthContext),
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  NULL,
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  avisynth_read_header,
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  avisynth_read_packet,
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  avisynth_read_close,
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  avisynth_read_seek,
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  NULL,
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  0,
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  "avs",
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};