FFmpeg/libavformat/avisynth.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

223 lines
6.7 KiB
C

/*
* AVISynth support for ffmpeg system
* Copyright (c) 2006 DivX, Inc.
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; 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 = AVMEDIA_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_coded_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 = ff_wav_codec_get_id(wvfmt.wFormatTag, st->codec->bits_per_coded_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 = AVMEDIA_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_coded_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 = ff_codec_get_id(ff_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(EIO);
if (av_new_packet(pkt, stream->chunck_size))
return AVERROR(EIO);
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",
NULL_IF_CONFIG_SMALL("AVISynth"),
sizeof(AVISynthContext),
NULL,
avisynth_read_header,
avisynth_read_packet,
avisynth_read_close,
avisynth_read_seek,
NULL,
0,
"avs",
};