/* * 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 = 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", };