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zoneminder/src/zm_mpeg.cpp

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/*
* ZoneMinder MPEG class implementation, $Date$, $Revision$
* Copyright (C) 2001-2008 Philip Coombes
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "zm_mpeg.h"
#include "zm_logger.h"
#include "zm_rgb.h"
#include "zm_time.h"
bool VideoStream::initialised = false;
VideoStream::MimeData VideoStream::mime_data[] = {
{ "asf", "video/x-ms-asf" },
{ "swf", "application/x-shockwave-flash" },
{ "flv", "video/x-flv" },
{ "mov", "video/quicktime" }
};
void VideoStream::Initialise( ) {
FFMPEGInit();
initialised = true;
}
void VideoStream::SetupFormat( ) {
/* allocate the output media context */
ofc = nullptr;
avformat_alloc_output_context2(&ofc, nullptr, format, filename);
if (!ofc) {
Fatal("avformat_alloc_..._context failed");
}
of = ofc->oformat;
Debug(1, "Using output format: %s (%s)", of->name, of->long_name);
}
int VideoStream::SetupCodec(
int colours,
int subpixelorder,
int width,
int height,
int bitrate,
double frame_rate
) {
/* ffmpeg format matching */
switch (colours) {
case ZM_COLOUR_RGB24:
if (subpixelorder == ZM_SUBPIX_ORDER_BGR) {
/* BGR subpixel order */
pf = AV_PIX_FMT_BGR24;
} else {
/* Assume RGB subpixel order */
pf = AV_PIX_FMT_RGB24;
}
break;
case ZM_COLOUR_RGB32:
if (subpixelorder == ZM_SUBPIX_ORDER_ARGB) {
/* ARGB subpixel order */
pf = AV_PIX_FMT_ARGB;
} else if (subpixelorder == ZM_SUBPIX_ORDER_ABGR) {
/* ABGR subpixel order */
pf = AV_PIX_FMT_ABGR;
} else if (subpixelorder == ZM_SUBPIX_ORDER_BGRA) {
/* BGRA subpixel order */
pf = AV_PIX_FMT_BGRA;
} else {
/* Assume RGBA subpixel order */
pf = AV_PIX_FMT_RGBA;
}
break;
case ZM_COLOUR_GRAY8:
pf = AV_PIX_FMT_GRAY8;
break;
default:
Panic("Unexpected colours: %d",colours);
break;
}
if (strcmp("rtp", of->name) == 0) {
// RTP must have a packet_size.
// Not sure what this value should be really...
ofc->packet_size = width*height;
Debug(1,"Setting packet_size to %d", ofc->packet_size);
}
_AVCODECID codec_id = of->video_codec;
if (codec_name) {
const AVCodec *a = avcodec_find_encoder_by_name(codec_name);
if (a) {
codec_id = a->id;
Debug(1, "Using codec \"%s\"", codec_name);
} else {
Debug(1, "Could not find codec \"%s\". Using default \"%s\"", codec_name, avcodec_get_name(codec_id));
}
}
/* add the video streams using the default format codecs
and initialize the codecs */
ost = nullptr;
if (codec_id != AV_CODEC_ID_NONE) {
codec = avcodec_find_encoder(codec_id);
if (!codec) {
Error("Could not find encoder for '%s'", avcodec_get_name(codec_id));
return -1;
}
Debug(1, "Found encoder for '%s'", avcodec_get_name(codec_id));
ost = avformat_new_stream(ofc, codec);
if (!ost) {
Error("Could not alloc stream");
return -1;
}
Debug(1, "Allocated stream (%d) !=? (%d)", ost->id , ofc->nb_streams - 1);
ost->id = ofc->nb_streams - 1;
codec_context = avcodec_alloc_context3(nullptr);
//avcodec_parameters_to_context(codec_context, ost->codecpar);
codec_context->codec_id = codec->id;
codec_context->codec_type = codec->type;
codec_context->pix_fmt = strcmp("mjpeg", ofc->oformat->name) == 0 ? AV_PIX_FMT_YUVJ422P : AV_PIX_FMT_YUV420P;
if (bitrate <= 100) {
// Quality based bitrate control (VBR). Scale is 1..31 where 1 is best.
// This gets rid of artifacts in the beginning of the movie; and well, even quality.
codec_context->flags |= AV_CODEC_FLAG_QSCALE;
codec_context->global_quality = FF_QP2LAMBDA * (31 - (31 * (bitrate / 100.0)));
} else {
codec_context->bit_rate = bitrate;
}
/* resolution must be a multiple of two */
codec_context->width = width;
codec_context->height = height;
/* time base: this is the fundamental unit of time (in seconds) in terms
of which frame timestamps are represented. for fixed-fps content,
timebase should be 1/framerate and timestamp increments should be
identically 1. */
codec_context->time_base.den = frame_rate;
codec_context->time_base.num = 1;
ost->time_base.den = frame_rate;
ost->time_base.num = 1;
Debug( 1, "Will encode in %d fps. %dx%d", codec_context->time_base.den, width, height );
/* emit one intra frame every second */
codec_context->gop_size = frame_rate;
// some formats want stream headers to be separate
if (of->flags & AVFMT_GLOBALHEADER)
codec_context->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
avcodec_parameters_from_context(ost->codecpar, codec_context);
zm_dump_codecpar(ost->codecpar);
} else {
Error("of->video_codec == AV_CODEC_ID_NONE");
return -1;
}
return 0;
}
void VideoStream::SetParameters( ) {
}
const char *VideoStream::MimeType() const {
for ( unsigned int i = 0; i < sizeof (mime_data) / sizeof (*mime_data); i++ ) {
if ( strcmp(format, mime_data[i].format) == 0 ) {
Debug(1, "MimeType is \"%s\"", mime_data[i].mime_type);
return mime_data[i].mime_type;
}
}
const char *mime_type = of->mime_type;
if ( !mime_type ) {
std::string mime = std::string("video/") + format;
mime_type = strdup(mime.c_str()); // mem leak
Warning( "Unable to determine mime type for '%s' format, using '%s' as default", format, mime_type);
}
Debug(1, "MimeType is \"%s\"", mime_type);
return mime_type;
}
bool VideoStream::OpenStream( ) {
int ret;
/* now that all the parameters are set, we can open the
video codecs and allocate the necessary encode buffers */
if ( ost ) {
Debug(1,"Opening codec");
/* open the codec */
if ((ret = avcodec_open2(codec_context, codec, nullptr)) < 0) {
Error("Could not open codec. Error code %d \"%s\"", ret, av_err2str(ret));
return false;
}
Debug( 1, "Opened codec" );
/* allocate the encoded raw picture */
opicture = av_frame_ptr{zm_av_frame_alloc()};
if (!opicture) {
Error("Could not allocate opicture");
return false;
}
opicture->width = codec_context->width;
opicture->height = codec_context->height;
opicture->format = codec_context->pix_fmt;
int size = av_image_get_buffer_size(codec_context->pix_fmt, codec_context->width, codec_context->height, 1);
opicture->buf[0] = av_buffer_alloc(size);
if (!opicture->buf[0]) {
Error( "Could not allocate opicture buffer" );
return false;
}
av_image_fill_arrays(opicture->data, opicture->linesize,
opicture->buf[0]->data, codec_context->pix_fmt, codec_context->width, codec_context->height, 1);
/* if the output format is not identical to the input format, then a temporary
picture is needed too. It is then converted to the required
output format */
if ( codec_context->pix_fmt != pf ) {
tmp_opicture = av_frame_ptr{av_frame_alloc()};
if (!tmp_opicture) {
Error("Could not allocate tmp_opicture");
return false;
}
size = av_image_get_buffer_size(pf, codec_context->width, codec_context->height, 1);
tmp_opicture->buf[0] = av_buffer_alloc(size);
if (!tmp_opicture->buf[0]) {
Error( "Could not allocate tmp_opicture buffer" );
return false;
}
av_image_fill_arrays(tmp_opicture->data,
tmp_opicture->linesize, tmp_opicture->buf[0]->data, pf,
codec_context->width, codec_context->height, 1);
}
} // end if ost
/* open the output file, if needed */
if ( !(of->flags & AVFMT_NOFILE) ) {
ret = avio_open2( &ofc->pb, filename, AVIO_FLAG_WRITE, nullptr, nullptr );
if ( ret < 0 ) {
Error("Could not open '%s'", filename);
return false;
}
Debug(1, "Opened output \"%s\"", filename);
} else {
Error( "of->flags & AVFMT_NOFILE" );
return false;
}
video_outbuf = nullptr;
if (codec_context->codec_type == AVMEDIA_TYPE_VIDEO &&
codec_context->codec_id == AV_CODEC_ID_RAWVIDEO) {
/* allocate output buffer */
/* XXX: API change will be done */
// TODO: Make buffer dynamic.
video_outbuf_size = 4000000;
video_outbuf = (uint8_t *)malloc( video_outbuf_size );
if ( video_outbuf == nullptr ) {
Fatal("Unable to malloc memory for outbuf");
}
}
av_dump_format(ofc, 0, filename, 1);
ret = avformat_write_header(ofc, nullptr);
if ( ret < 0 ) {
Error("?_write_header failed with error %d \"%s\"", ret, av_err2str(ret));
return false;
}
return true;
}
VideoStream::VideoStream( const char *in_filename, const char *in_format, int bitrate, double frame_rate, int colours, int subpixelorder, int width, int height ) :
filename(in_filename),
format(in_format),
video_outbuf(nullptr),
video_outbuf_size(0),
last_pts( -1 ),
streaming_thread(0),
do_streaming(true),
add_timestamp(false),
timestamp(0),
buffer_copy(nullptr),
buffer_copy_lock(new pthread_mutex_t),
buffer_copy_size(0),
buffer_copy_used(0),
packet_index(0)
{
if ( !initialised ) {
Initialise( );
}
if ( format ) {
int length = strlen(format);
codec_and_format = new char[length+1];;
strcpy( codec_and_format, format );
format = codec_and_format;
codec_name = nullptr;
char *f = strchr(codec_and_format, '/');
if (f != nullptr) {
*f = 0;
codec_name = f+1;
}
}
codec_context = nullptr;
SetupFormat( );
SetupCodec( colours, subpixelorder, width, height, bitrate, frame_rate );
SetParameters( );
// Allocate buffered packets.
for (auto &pkt : packet_buffers)
pkt = av_packet_ptr{av_packet_alloc()};
// Initialize mutex used by streaming thread.
if ( pthread_mutex_init( buffer_copy_lock, nullptr ) != 0 ) {
Fatal("pthread_mutex_init failed");
}
}
VideoStream::~VideoStream( ) {
Debug( 1, "VideoStream destructor." );
// Stop streaming thread.
if ( streaming_thread ) {
do_streaming = false;
void* thread_exit_code;
Debug( 1, "Asking streaming thread to exit." );
// Wait for thread to exit.
pthread_join(streaming_thread, &thread_exit_code);
}
if ( buffer_copy != nullptr ) {
av_free( buffer_copy );
}
if ( buffer_copy_lock ) {
if ( pthread_mutex_destroy( buffer_copy_lock ) != 0 ) {
Error( "pthread_mutex_destroy failed" );
}
delete buffer_copy_lock;
}
/* close each codec */
if ( ost ) {
avcodec_close( codec_context );
av_free( video_outbuf );
}
/* write the trailer, if any */
av_write_trailer( ofc );
/* free the streams */
for ( unsigned int i = 0; i < ofc->nb_streams; i++ ) {
av_freep( &ofc->streams[i] );
}
if ( !(of->flags & AVFMT_NOFILE) ) {
/* close the output file */
avio_close( ofc->pb );
}
/* free the stream */
av_free( ofc );
/* free format and codec_name data. */
if ( codec_and_format ) {
delete codec_and_format;
}
}
double VideoStream::EncodeFrame( const uint8_t *buffer, int buffer_size, bool _add_timestamp, unsigned int _timestamp ) {
if ( pthread_mutex_lock(buffer_copy_lock) != 0 ) {
Fatal( "EncodeFrame: pthread_mutex_lock failed." );
}
if (buffer_copy_size < buffer_size) {
if ( buffer_copy ) {
av_free(buffer_copy);
}
// Allocate a buffer to store source images for the streaming thread to encode.
buffer_copy = (uint8_t *)av_malloc(buffer_size);
if ( !buffer_copy ) {
Error( "Could not allocate buffer_copy" );
pthread_mutex_unlock(buffer_copy_lock);
return 0;
}
buffer_copy_size = buffer_size;
}
add_timestamp = _add_timestamp;
timestamp = _timestamp;
buffer_copy_used = buffer_size;
memcpy(buffer_copy, buffer, buffer_size);
if ( pthread_mutex_unlock(buffer_copy_lock) != 0 ) {
Fatal( "EncodeFrame: pthread_mutex_unlock failed." );
}
if ( streaming_thread == 0 ) {
Debug( 1, "Starting streaming thread" );
// Start a thread for streaming encoded video.
if (pthread_create( &streaming_thread, nullptr, StreamingThreadCallback, (void*) this) != 0){
// Log a fatal error and exit the process.
Fatal( "VideoStream failed to create streaming thread." );
}
}
//return ActuallyEncodeFrame( buffer, buffer_size, add_timestamp, timestamp);
return _timestamp;
}
double VideoStream::ActuallyEncodeFrame( const uint8_t *buffer, int buffer_size, bool add_timestamp, unsigned int timestamp ) {
if ( codec_context->pix_fmt != pf ) {
static struct SwsContext *img_convert_ctx = nullptr;
memcpy( tmp_opicture->data[0], buffer, buffer_size );
if ( !img_convert_ctx ) {
img_convert_ctx = sws_getCachedContext( nullptr, codec_context->width, codec_context->height, pf, codec_context->width, codec_context->height, codec_context->pix_fmt, SWS_BICUBIC, nullptr, nullptr, nullptr );
if ( !img_convert_ctx )
Panic( "Unable to initialise image scaling context" );
}
sws_scale( img_convert_ctx, tmp_opicture->data, tmp_opicture->linesize, 0, codec_context->height, opicture->data, opicture->linesize );
} else {
memcpy( opicture->data[0], buffer, buffer_size );
}
AVFrame *opicture_ptr = opicture.get();
AVPacket *pkt = packet_buffers[packet_index].get();
if (codec_context->codec_type == AVMEDIA_TYPE_VIDEO &&
codec_context->codec_id == AV_CODEC_ID_RAWVIDEO) {
pkt->flags |= AV_PKT_FLAG_KEY;
pkt->stream_index = ost->index;
pkt->data = (uint8_t *)opicture_ptr;
pkt->size = buffer_size;
} else {
opicture_ptr->pts = codec_context->frame_number;
opicture_ptr->quality = codec_context->global_quality;
avcodec_send_frame(codec_context, opicture_ptr);
int ret = avcodec_receive_packet(codec_context, pkt);
if (ret < 0) {
if (AVERROR_EOF != ret) {
Error("Error encoding video (%d) (%s)", ret, av_err2str(ret));
}
} else {
// if ( c->coded_frame->key_frame )
// {
// pkt->flags |= AV_PKT_FLAG_KEY;
// }
if ( pkt->pts != (int64_t)AV_NOPTS_VALUE ) {
pkt->pts = av_rescale_q( pkt->pts, codec_context->time_base, ost->time_base );
}
if ( pkt->dts != (int64_t)AV_NOPTS_VALUE ) {
pkt->dts = av_rescale_q( pkt->dts, codec_context->time_base, ost->time_base );
}
pkt->duration = av_rescale_q( pkt->duration, codec_context->time_base, ost->time_base );
pkt->stream_index = ost->index;
}
}
return opicture_ptr->pts;
}
int VideoStream::SendPacket(AVPacket *packet) {
int ret = av_write_frame(ofc, packet);
if (ret < 0) {
Error("Error %d while writing video frame: %s", ret, av_err2str(errno));
}
av_packet_unref(packet);
return ret;
}
void *VideoStream::StreamingThreadCallback(void *ctx) {
Debug(1, "StreamingThreadCallback started");
if (ctx == nullptr) {
return nullptr;
}
VideoStream *videoStream = reinterpret_cast<VideoStream *>(ctx);
TimePoint::duration target_interval = std::chrono::duration_cast<TimePoint::duration>(FPSeconds(
videoStream->codec_context->time_base.num / static_cast<double>(videoStream->codec_context->time_base.den)));
uint64_t frame_count = 0;
TimePoint start_time = std::chrono::steady_clock::now();
while (videoStream->do_streaming) {
TimePoint current_time = std::chrono::steady_clock::now();
TimePoint target = start_time + (target_interval * frame_count);
if (current_time < target) {
// It's not time to render a frame yet.
std::this_thread::sleep_for(target - current_time);
}
// By sending the last rendered frame we deliver frames to the client more accurate.
// If we're encoding the frame before sending it there will be lag.
// Since this lag is not constant the client may skip frames.
// Get the last rendered packet.
AVPacket *packet = videoStream->packet_buffers[videoStream->packet_index].get();
if (packet->size) {
videoStream->SendPacket(packet);
}
av_packet_unref(packet);
videoStream->packet_index = videoStream->packet_index ? 0 : 1;
// Lock buffer and render next frame.
if (pthread_mutex_lock(videoStream->buffer_copy_lock) != 0) {
Fatal("StreamingThreadCallback: pthread_mutex_lock failed.");
}
if (videoStream->buffer_copy) {
// Encode next frame.
videoStream->ActuallyEncodeFrame(videoStream->buffer_copy,
videoStream->buffer_copy_used,
videoStream->add_timestamp,
videoStream->timestamp);
}
if (pthread_mutex_unlock(videoStream->buffer_copy_lock) != 0) {
Fatal("StreamingThreadCallback: pthread_mutex_unlock failed.");
}
frame_count++;
}
return nullptr;
}
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