2004-03-04 23:05:54 +08:00
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/*
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* ZoneMinder MPEG class implementation, $Date$, $Revision$
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* Copyright (C) 2003 Philip Coombes
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "zm.h"
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#include "zm_mpeg.h"
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#if HAVE_LIBAVCODEC
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bool VideoStream::initialised = false;
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void VideoStream::Initialise()
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{
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av_register_all();
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initialised = true;
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}
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void VideoStream::SetupFormat( const char *p_filename, const char *format )
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{
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filename = p_filename;
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/* auto detect the output format from the name. default is mpeg. */
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of = guess_format( format, NULL, NULL);
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if ( !of )
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{
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Warning(( "Could not deduce output format from file extension: using MPEG." ));
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of = guess_format("mpeg", NULL, NULL);
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}
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if ( !of )
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{
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Fatal(( "Could not find suitable output format" ));
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}
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/* allocate the output media context */
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ofc = (AVFormatContext *)av_mallocz(sizeof(AVFormatContext));
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if ( !ofc )
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{
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Fatal(( "Memory error" ));
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}
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ofc->oformat = of;
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snprintf(ofc->filename, sizeof(ofc->filename), "%s", filename);
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}
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2004-03-05 18:40:45 +08:00
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void VideoStream::SetupCodec( int colours, int width, int height, int bitrate, int frame_rate )
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2004-03-04 23:05:54 +08:00
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{
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pf = (colours==1?PIX_FMT_GRAY8:PIX_FMT_RGB24);
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/* add the video streams using the default format codecs
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and initialize the codecs */
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ost = NULL;
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if (of->video_codec != CODEC_ID_NONE)
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{
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ost = av_new_stream(ofc, 0);
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if (!ost)
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{
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Fatal(( "Could not alloc stream" ));
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}
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AVCodecContext *c = &ost->codec;
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c->codec_id = of->video_codec;
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c->codec_type = CODEC_TYPE_VIDEO;
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/* put sample parameters */
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2004-03-05 18:40:45 +08:00
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c->bit_rate = bitrate;
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2004-03-04 23:05:54 +08:00
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/* resolution must be a multiple of two */
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c->width = width;
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c->height = height;
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/* frames per second */
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c->frame_rate = frame_rate;
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c->frame_rate_base = 1;
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c->gop_size = frame_rate/2; /* emit one intra frame every half second or so */
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c->gop_size = 30;
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if ( c->gop_size < 3 )
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c->gop_size = 3;
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if (c->codec_id == CODEC_ID_MPEG1VIDEO ||
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c->codec_id == CODEC_ID_MPEG2VIDEO)
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{
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/* just for testing, we also add B frames */
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c->max_b_frames = 2;
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}
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}
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}
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void VideoStream::SetParameters()
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{
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/* set the output parameters (must be done even if no
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parameters). */
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if (av_set_parameters(ofc, NULL) < 0)
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{
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Fatal(( "Invalid output format parameters" ));
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}
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//dump_format(ofc, 0, filename, 1);
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}
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void VideoStream::OpenStream()
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{
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/* now that all the parameters are set, we can open the
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video codecs and allocate the necessary encode buffers */
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if (ost)
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{
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AVCodecContext *c = &ost->codec;
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/* find the video encoder */
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AVCodec *codec = avcodec_find_encoder(c->codec_id);
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if (!codec)
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{
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Fatal(( "codec not found" ));
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}
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/* open the codec */
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if (avcodec_open(c, codec) < 0)
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{
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Fatal(( "could not open codec" ));
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}
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/* allocate the encoded raw picture */
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opicture = avcodec_alloc_frame();
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if (!opicture)
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{
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Fatal(( "Could not allocate opicture" ));
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}
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int size = avpicture_get_size( c->pix_fmt, c->width, c->height);
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uint8_t *opicture_buf = (uint8_t *)malloc(size);
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if (!opicture_buf)
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{
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av_free(opicture);
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Fatal(( "Could not allocate opicture" ));
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}
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avpicture_fill((AVPicture *)opicture, opicture_buf, c->pix_fmt, c->width, c->height);
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/* if the output format is not RGB24, then a temporary RGB24
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picture is needed too. It is then converted to the required
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output format */
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tmp_opicture = NULL;
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if (c->pix_fmt != pf)
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{
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tmp_opicture = avcodec_alloc_frame();
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if (!tmp_opicture)
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{
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Fatal(( "Could not allocate temporary opicture" ));
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}
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int size = avpicture_get_size( pf, c->width, c->height);
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uint8_t *tmp_opicture_buf = (uint8_t *)malloc(size);
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if (!tmp_opicture_buf)
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{
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av_free(tmp_opicture);
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Fatal(( "Could not allocate temporary opicture" ));
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}
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avpicture_fill((AVPicture *)tmp_opicture, tmp_opicture_buf, pf, c->width, c->height);
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}
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}
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/* open the output file, if needed */
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if (!(of->flags & AVFMT_NOFILE))
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{
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if (url_fopen(&ofc->pb, filename, URL_WRONLY) < 0)
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{
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Fatal(( "Could not open '%s'", filename ));
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}
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}
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video_outbuf = NULL;
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if (!(ofc->oformat->flags & AVFMT_RAWPICTURE))
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{
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/* allocate output buffer */
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/* XXX: API change will be done */
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video_outbuf_size = 200000;
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video_outbuf = (uint8_t *)malloc(video_outbuf_size);
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}
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/* write the stream header, if any */
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av_write_header(ofc);
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}
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2004-03-05 18:40:45 +08:00
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VideoStream::VideoStream( const char *filename, const char *format, int bitrate, int frame_rate, int colours, int width, int height )
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2004-03-04 23:05:54 +08:00
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{
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if ( !initialised )
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{
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Initialise();
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}
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SetupFormat( filename, format );
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2004-03-05 18:40:45 +08:00
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SetupCodec( colours, width, height, bitrate, frame_rate );
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2004-03-04 23:05:54 +08:00
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SetParameters();
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OpenStream();
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}
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VideoStream::~VideoStream()
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{
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/* close each codec */
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if (ost)
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{
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avcodec_close(&ost->codec);
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av_free(opicture->data[0]);
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av_free(opicture);
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if (tmp_opicture)
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{
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av_free(tmp_opicture->data[0]);
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av_free(tmp_opicture);
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}
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av_free(video_outbuf);
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}
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/* write the trailer, if any */
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av_write_trailer(ofc);
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/* free the streams */
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for( int i = 0; i < ofc->nb_streams; i++)
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{
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av_freep(&ofc->streams[i]);
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}
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if (!(of->flags & AVFMT_NOFILE))
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{
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/* close the output file */
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url_fclose(&ofc->pb);
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}
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/* free the stream */
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av_free(ofc);
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}
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double VideoStream::EncodeFrame( uint8_t *buffer, int buffer_size )
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{
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double pts = 0.0;
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/* compute current video time */
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if (ost)
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pts = (double)ost->pts.val * ofc->pts_num / ofc->pts_den;
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//if (!ost || pts >= STREAM_DURATION)
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//break;
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/* write video frames */
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AVCodecContext *c = &ost->codec;
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if (c->pix_fmt != pf)
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{
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/* as we only access a RGB24 picture, we must convert it
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to the codec pixel format if needed */
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//tmp_opicture->data[0] = snap_image->Buffer();
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memcpy( tmp_opicture->data[0], buffer, buffer_size );
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img_convert((AVPicture *)opicture, c->pix_fmt,
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(AVPicture *)tmp_opicture, pf,
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c->width, c->height);
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}
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else
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{
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//opicture->data[0] = snap_image->Buffer();
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memcpy( opicture->data[0], buffer, buffer_size );
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}
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AVFrame *opicture_ptr = opicture;
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int ret = 0;
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if (ofc->oformat->flags & AVFMT_RAWPICTURE)
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{
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/* raw video case. The API will change slightly in the near
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futur for that */
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ret = av_write_frame(ofc, ost->index, (uint8_t *)opicture_ptr, sizeof(AVPicture));
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}
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else
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{
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/* encode the image */
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int out_size = avcodec_encode_video(c, video_outbuf, video_outbuf_size, opicture_ptr);
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/* if zero size, it means the image was buffered */
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if (out_size != 0)
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{
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/* write the compressed frame in the media file */
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/* XXX: in case of B frames, the pts is not yet valid */
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ret = av_write_frame(ofc, ost->index, video_outbuf, out_size);
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}
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}
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if (ret != 0)
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{
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Fatal(( "Error while writing video frame" ));
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}
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}
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#endif // HAVE_LIBAVCODEC
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