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/*
* AVISynth support for ffmpeg system
* Copyright (c) 2006 DivX, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "riff.h"
#include <windows.h>
#include <vfw.h>
typedef struct {
PAVISTREAM handle;
AVISTREAMINFO info;
DWORD read;
LONG chunck_size;
LONG chunck_samples;
} AVISynthStream;
typedef struct {
PAVIFILE file;
AVISynthStream *streams;
int nb_streams;
int next_stream;
} AVISynthContext;
static int avisynth_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
AVISynthContext *avs = s->priv_data;
HRESULT res;
AVIFILEINFO info;
DWORD id;
AVStream *st;
AVISynthStream *stream;
AVIFileInit();
res = AVIFileOpen(&avs->file, s->filename, OF_READ|OF_SHARE_DENY_WRITE, NULL);
if (res != S_OK)
{
av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld", res);
AVIFileExit();
return -1;
}
res = AVIFileInfo(avs->file, &info, sizeof(info));
if (res != S_OK)
{
av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld", res);
AVIFileExit();
return -1;
}
avs->streams = av_mallocz(info.dwStreams * sizeof(AVISynthStream));
for (id=0; id<info.dwStreams; id++)
{
stream = &avs->streams[id];
stream->read = 0;
if (AVIFileGetStream(avs->file, &stream->handle, 0, id) == S_OK)
{
if (AVIStreamInfo(stream->handle, &stream->info, sizeof(stream->info)) == S_OK)
{
if (stream->info.fccType == streamtypeAUDIO)
{
WAVEFORMATEX wvfmt;
LONG struct_size = sizeof(WAVEFORMATEX);
if (AVIStreamReadFormat(stream->handle, 0, &wvfmt, &struct_size) != S_OK)
continue;
st = av_new_stream(s, id);
st->codec->codec_type = CODEC_TYPE_AUDIO;
st->codec->block_align = wvfmt.nBlockAlign;
st->codec->channels = wvfmt.nChannels;
st->codec->sample_rate = wvfmt.nSamplesPerSec;
st->codec->bit_rate = wvfmt.nAvgBytesPerSec * 8;
st->codec->bits_per_sample = wvfmt.wBitsPerSample;
stream->chunck_samples = wvfmt.nSamplesPerSec * (uint64_t)info.dwScale / (uint64_t)info.dwRate;
stream->chunck_size = stream->chunck_samples * wvfmt.nChannels * wvfmt.wBitsPerSample / 8;
st->codec->codec_tag = wvfmt.wFormatTag;
st->codec->codec_id = wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_sample);
}
else if (stream->info.fccType == streamtypeVIDEO)
{
BITMAPINFO imgfmt;
LONG struct_size = sizeof(BITMAPINFO);
stream->chunck_size = stream->info.dwSampleSize;
stream->chunck_samples = 1;
if (AVIStreamReadFormat(stream->handle, 0, &imgfmt, &struct_size) != S_OK)
continue;
st = av_new_stream(s, id);
st->codec->codec_type = CODEC_TYPE_VIDEO;
st->r_frame_rate.num = stream->info.dwRate;
st->r_frame_rate.den = stream->info.dwScale;
st->codec->width = imgfmt.bmiHeader.biWidth;
st->codec->height = imgfmt.bmiHeader.biHeight;
st->codec->bits_per_sample = imgfmt.bmiHeader.biBitCount;
st->codec->bit_rate = (uint64_t)stream->info.dwSampleSize * (uint64_t)stream->info.dwRate * 8 / (uint64_t)stream->info.dwScale;
st->codec->codec_tag = imgfmt.bmiHeader.biCompression;
st->codec->codec_id = codec_get_id(codec_bmp_tags, imgfmt.bmiHeader.biCompression);
st->duration = stream->info.dwLength;
}
else
{
AVIStreamRelease(stream->handle);
continue;
}
avs->nb_streams++;
st->codec->stream_codec_tag = stream->info.fccHandler;
av_set_pts_info(st, 64, info.dwScale, info.dwRate);
st->start_time = stream->info.dwStart;
}
}
}
return 0;
}
static int avisynth_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AVISynthContext *avs = s->priv_data;
HRESULT res;
AVISynthStream *stream;
int stream_id = avs->next_stream;
LONG read_size;
// handle interleaving manually...
stream = &avs->streams[stream_id];
if (stream->read >= stream->info.dwLength)
return AVERROR_IO;
if (av_new_packet(pkt, stream->chunck_size))
return AVERROR_IO;
pkt->stream_index = stream_id;
pkt->pts = avs->streams[stream_id].read / avs->streams[stream_id].chunck_samples;
res = AVIStreamRead(stream->handle, stream->read, stream->chunck_samples, pkt->data, stream->chunck_size, &read_size, NULL);
pkt->pts = stream->read;
pkt->size = read_size;
stream->read += stream->chunck_samples;
// prepare for the next stream to read
do {
avs->next_stream = (avs->next_stream+1) % avs->nb_streams;
} while (avs->next_stream != stream_id && s->streams[avs->next_stream]->discard >= AVDISCARD_ALL);
return (res == S_OK) ? pkt->size : -1;
}
static int avisynth_read_close(AVFormatContext *s)
{
AVISynthContext *avs = s->priv_data;
int i;
for (i=0;i<avs->nb_streams;i++)
{
AVIStreamRelease(avs->streams[i].handle);
}
av_free(avs->streams);
AVIFileRelease(avs->file);
AVIFileExit();
return 0;
}
static int avisynth_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
{
AVISynthContext *avs = s->priv_data;
int stream_id;
for (stream_id = 0; stream_id < avs->nb_streams; stream_id++)
{
avs->streams[stream_id].read = pts * avs->streams[stream_id].chunck_samples;
}
return 0;
}
AVInputFormat avisynth_demuxer = {
"avs",
"AVISynth",
sizeof(AVISynthContext),
NULL,
avisynth_read_header,
avisynth_read_packet,
avisynth_read_close,
avisynth_read_seek,
NULL,
0,
"avs",
};
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