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FFmpegReader.cpp
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FFmpegReader.cpp
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/**
* @file
* @brief Source file for FFmpegReader class
* @author Jonathan Thomas <jonathan@openshot.org>, Fabrice Bellard
*
* @ref License
*/
/* LICENSE
*
* Copyright (c) 2008-2019 OpenShot Studios, LLC, Fabrice Bellard
* (http://www.openshotstudios.com). This file is part of
* OpenShot Library (http://www.openshot.org), an open-source project
* dedicated to delivering high quality video editing and animation solutions
* to the world.
*
* This file is originally based on the Libavformat API example, and then modified
* by the libopenshot project.
*
* OpenShot Library (libopenshot) 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 3 of the
* License, or (at your option) any later version.
*
* OpenShot Library (libopenshot) 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 OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "FFmpegReader.h"
#include "Exceptions.h"
#include <thread> // for std::this_thread::sleep_for
#include <chrono> // for std::chrono::milliseconds
#define ENABLE_VAAPI 0
#if HAVE_HW_ACCEL
#pragma message "You are compiling with experimental hardware decode"
#else
#pragma message "You are compiling only with software decode"
#endif
#if HAVE_HW_ACCEL
#define MAX_SUPPORTED_WIDTH 1950
#define MAX_SUPPORTED_HEIGHT 1100
#if ENABLE_VAAPI
#include "libavutil/hwcontext_vaapi.h"
typedef struct VAAPIDecodeContext {
VAProfile va_profile;
VAEntrypoint va_entrypoint;
VAConfigID va_config;
VAContextID va_context;
#if FF_API_STRUCT_VAAPI_CONTEXT
// FF_DISABLE_DEPRECATION_WARNINGS
int have_old_context;
struct vaapi_context *old_context;
AVBufferRef *device_ref;
// FF_ENABLE_DEPRECATION_WARNINGS
#endif
AVHWDeviceContext *device;
AVVAAPIDeviceContext *hwctx;
AVHWFramesContext *frames;
AVVAAPIFramesContext *hwfc;
enum AVPixelFormat surface_format;
int surface_count;
} VAAPIDecodeContext;
#endif // ENABLE_VAAPI
#endif // HAVE_HW_ACCEL
using namespace openshot;
int hw_de_on = 0;
#if HAVE_HW_ACCEL
AVPixelFormat hw_de_av_pix_fmt_global = AV_PIX_FMT_NONE;
AVHWDeviceType hw_de_av_device_type_global = AV_HWDEVICE_TYPE_NONE;
#endif
FFmpegReader::FFmpegReader(const std::string& path, bool inspect_reader)
: last_frame(0), is_seeking(0), seeking_pts(0), seeking_frame(0), seek_count(0),
audio_pts_offset(99999), video_pts_offset(99999), path(path), is_video_seek(true), check_interlace(false),
check_fps(false), enable_seek(true), is_open(false), seek_audio_frame_found(0), seek_video_frame_found(0),
prev_samples(0), prev_pts(0), pts_total(0), pts_counter(0), is_duration_known(false), largest_frame_processed(0),
current_video_frame(0), has_missing_frames(false), num_packets_since_video_frame(0), num_checks_since_final(0),
packet(NULL), max_concurrent_frames(OPEN_MP_NUM_PROCESSORS) {
// Initialize FFMpeg, and register all formats and codecs
AV_REGISTER_ALL
AVCODEC_REGISTER_ALL
// Init cache
working_cache.SetMaxBytesFromInfo(max_concurrent_frames * info.fps.ToDouble() * 2, info.width, info.height, info.sample_rate, info.channels);
missing_frames.SetMaxBytesFromInfo(max_concurrent_frames * 2, info.width, info.height, info.sample_rate, info.channels);
final_cache.SetMaxBytesFromInfo(max_concurrent_frames * 2, info.width, info.height, info.sample_rate, info.channels);
// Open and Close the reader, to populate its attributes (such as height, width, etc...)
if (inspect_reader) {
Open();
Close();
}
}
FFmpegReader::~FFmpegReader() {
if (is_open)
// Auto close reader if not already done
Close();
}
// This struct holds the associated video frame and starting sample # for an audio packet.
bool AudioLocation::is_near(AudioLocation location, int samples_per_frame, int64_t amount) {
// Is frame even close to this one?
if (abs(location.frame - frame) >= 2)
// This is too far away to be considered
return false;
// Note that samples_per_frame can vary slightly frame to frame when the
// audio sampling rate is not an integer multiple of the video fps.
int64_t diff = samples_per_frame * (location.frame - frame) + location.sample_start - sample_start;
if (abs(diff) <= amount)
// close
return true;
// not close
return false;
}
#if HAVE_HW_ACCEL
// Get hardware pix format
static enum AVPixelFormat get_hw_dec_format(AVCodecContext *ctx, const enum AVPixelFormat *pix_fmts)
{
const enum AVPixelFormat *p;
for (p = pix_fmts; *p != AV_PIX_FMT_NONE; p++) {
switch (*p) {
#if defined(__linux__)
// Linux pix formats
case AV_PIX_FMT_VAAPI:
hw_de_av_pix_fmt_global = AV_PIX_FMT_VAAPI;
hw_de_av_device_type_global = AV_HWDEVICE_TYPE_VAAPI;
return *p;
break;
case AV_PIX_FMT_VDPAU:
hw_de_av_pix_fmt_global = AV_PIX_FMT_VDPAU;
hw_de_av_device_type_global = AV_HWDEVICE_TYPE_VDPAU;
return *p;
break;
#endif
#if defined(_WIN32)
// Windows pix formats
case AV_PIX_FMT_DXVA2_VLD:
hw_de_av_pix_fmt_global = AV_PIX_FMT_DXVA2_VLD;
hw_de_av_device_type_global = AV_HWDEVICE_TYPE_DXVA2;
return *p;
break;
case AV_PIX_FMT_D3D11:
hw_de_av_pix_fmt_global = AV_PIX_FMT_D3D11;
hw_de_av_device_type_global = AV_HWDEVICE_TYPE_D3D11VA;
return *p;
break;
#endif
#if defined(__APPLE__)
// Apple pix formats
case AV_PIX_FMT_VIDEOTOOLBOX:
hw_de_av_pix_fmt_global = AV_PIX_FMT_VIDEOTOOLBOX;
hw_de_av_device_type_global = AV_HWDEVICE_TYPE_VIDEOTOOLBOX;
return *p;
break;
#endif
// Cross-platform pix formats
case AV_PIX_FMT_CUDA:
hw_de_av_pix_fmt_global = AV_PIX_FMT_CUDA;
hw_de_av_device_type_global = AV_HWDEVICE_TYPE_CUDA;
return *p;
break;
case AV_PIX_FMT_QSV:
hw_de_av_pix_fmt_global = AV_PIX_FMT_QSV;
hw_de_av_device_type_global = AV_HWDEVICE_TYPE_QSV;
return *p;
break;
default:
// This is only here to silence unused-enum warnings
break;
}
}
ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::get_hw_dec_format (Unable to decode this file using hardware decode)");
return AV_PIX_FMT_NONE;
}
int FFmpegReader::IsHardwareDecodeSupported(int codecid)
{
int ret;
switch (codecid) {
case AV_CODEC_ID_H264:
case AV_CODEC_ID_MPEG2VIDEO:
case AV_CODEC_ID_VC1:
case AV_CODEC_ID_WMV1:
case AV_CODEC_ID_WMV2:
case AV_CODEC_ID_WMV3:
ret = 1;
break;
default :
ret = 0;
break;
}
return ret;
}
#endif // HAVE_HW_ACCEL
void FFmpegReader::Open() {
// Open reader if not already open
if (!is_open) {
// Initialize format context
pFormatCtx = NULL;
{
hw_de_on = (openshot::Settings::Instance()->HARDWARE_DECODER == 0 ? 0 : 1);
}
// Open video file
if (avformat_open_input(&pFormatCtx, path.c_str(), NULL, NULL) != 0)
throw InvalidFile("File could not be opened.", path);
// Retrieve stream information
if (avformat_find_stream_info(pFormatCtx, NULL) < 0)
throw NoStreamsFound("No streams found in file.", path);
videoStream = -1;
audioStream = -1;
// Loop through each stream, and identify the video and audio stream index
for (unsigned int i = 0; i < pFormatCtx->nb_streams; i++) {
// Is this a video stream?
if (AV_GET_CODEC_TYPE(pFormatCtx->streams[i]) == AVMEDIA_TYPE_VIDEO && videoStream < 0) {
videoStream = i;
}
// Is this an audio stream?
if (AV_GET_CODEC_TYPE(pFormatCtx->streams[i]) == AVMEDIA_TYPE_AUDIO && audioStream < 0) {
audioStream = i;
}
}
if (videoStream == -1 && audioStream == -1)
throw NoStreamsFound("No video or audio streams found in this file.", path);
// Is there a video stream?
if (videoStream != -1) {
// Set the stream index
info.video_stream_index = videoStream;
// Set the codec and codec context pointers
pStream = pFormatCtx->streams[videoStream];
// Find the codec ID from stream
AVCodecID codecId = AV_FIND_DECODER_CODEC_ID(pStream);
// Get codec and codec context from stream
AVCodec *pCodec = avcodec_find_decoder(codecId);
AVDictionary *opts = NULL;
int retry_decode_open = 2;
// If hw accel is selected but hardware cannot handle repeat with software decoding
do {
pCodecCtx = AV_GET_CODEC_CONTEXT(pStream, pCodec);
#if HAVE_HW_ACCEL
if (hw_de_on && (retry_decode_open==2)) {
// Up to here no decision is made if hardware or software decode
hw_de_supported = IsHardwareDecodeSupported(pCodecCtx->codec_id);
}
#endif
retry_decode_open = 0;
// Set number of threads equal to number of processors (not to exceed 16)
pCodecCtx->thread_count = std::min(FF_NUM_PROCESSORS, 16);
if (pCodec == NULL) {
throw InvalidCodec("A valid video codec could not be found for this file.", path);
}
// Init options
av_dict_set(&opts, "strict", "experimental", 0);
#if HAVE_HW_ACCEL
if (hw_de_on && hw_de_supported) {
// Open Hardware Acceleration
int i_decoder_hw = 0;
char adapter[256];
char *adapter_ptr = NULL;
int adapter_num;
adapter_num = openshot::Settings::Instance()->HW_DE_DEVICE_SET;
fprintf(stderr, "Hardware decoding device number: %d\n", adapter_num);
// Set hardware pix format (callback)
pCodecCtx->get_format = get_hw_dec_format;
if (adapter_num < 3 && adapter_num >=0) {
#if defined(__linux__)
snprintf(adapter,sizeof(adapter),"/dev/dri/renderD%d", adapter_num+128);
adapter_ptr = adapter;
i_decoder_hw = openshot::Settings::Instance()->HARDWARE_DECODER;
switch (i_decoder_hw) {
case 1:
hw_de_av_device_type = AV_HWDEVICE_TYPE_VAAPI;
break;
case 2:
hw_de_av_device_type = AV_HWDEVICE_TYPE_CUDA;
break;
case 6:
hw_de_av_device_type = AV_HWDEVICE_TYPE_VDPAU;
break;
case 7:
hw_de_av_device_type = AV_HWDEVICE_TYPE_QSV;
break;
default:
hw_de_av_device_type = AV_HWDEVICE_TYPE_VAAPI;
break;
}
#elif defined(_WIN32)
adapter_ptr = NULL;
i_decoder_hw = openshot::Settings::Instance()->HARDWARE_DECODER;
switch (i_decoder_hw) {
case 2:
hw_de_av_device_type = AV_HWDEVICE_TYPE_CUDA;
break;
case 3:
hw_de_av_device_type = AV_HWDEVICE_TYPE_DXVA2;
break;
case 4:
hw_de_av_device_type = AV_HWDEVICE_TYPE_D3D11VA;
break;
case 7:
hw_de_av_device_type = AV_HWDEVICE_TYPE_QSV;
break;
default:
hw_de_av_device_type = AV_HWDEVICE_TYPE_DXVA2;
break;
}
#elif defined(__APPLE__)
adapter_ptr = NULL;
i_decoder_hw = openshot::Settings::Instance()->HARDWARE_DECODER;
switch (i_decoder_hw) {
case 5:
hw_de_av_device_type = AV_HWDEVICE_TYPE_VIDEOTOOLBOX;
break;
case 7:
hw_de_av_device_type = AV_HWDEVICE_TYPE_QSV;
break;
default:
hw_de_av_device_type = AV_HWDEVICE_TYPE_VIDEOTOOLBOX;
break;
}
#endif
} else {
adapter_ptr = NULL; // Just to be sure
}
// Check if it is there and writable
#if defined(__linux__)
if( adapter_ptr != NULL && access( adapter_ptr, W_OK ) == 0 ) {
#elif defined(_WIN32)
if( adapter_ptr != NULL ) {
#elif defined(__APPLE__)
if( adapter_ptr != NULL ) {
#endif
ZmqLogger::Instance()->AppendDebugMethod("Decode Device present using device");
}
else {
adapter_ptr = NULL; // use default
ZmqLogger::Instance()->AppendDebugMethod("Decode Device not present using default");
}
hw_device_ctx = NULL;
// Here the first hardware initialisations are made
if (av_hwdevice_ctx_create(&hw_device_ctx, hw_de_av_device_type, adapter_ptr, NULL, 0) >= 0) {
if (!(pCodecCtx->hw_device_ctx = av_buffer_ref(hw_device_ctx))) {
throw InvalidCodec("Hardware device reference create failed.", path);
}
/*
av_buffer_unref(&ist->hw_frames_ctx);
ist->hw_frames_ctx = av_hwframe_ctx_alloc(hw_device_ctx);
if (!ist->hw_frames_ctx) {
av_log(avctx, AV_LOG_ERROR, "Error creating a CUDA frames context\n");
return AVERROR(ENOMEM);
}
frames_ctx = (AVHWFramesContext*)ist->hw_frames_ctx->data;
frames_ctx->format = AV_PIX_FMT_CUDA;
frames_ctx->sw_format = avctx->sw_pix_fmt;
frames_ctx->width = avctx->width;
frames_ctx->height = avctx->height;
av_log(avctx, AV_LOG_DEBUG, "Initializing CUDA frames context: sw_format = %s, width = %d, height = %d\n",
av_get_pix_fmt_name(frames_ctx->sw_format), frames_ctx->width, frames_ctx->height);
ret = av_hwframe_ctx_init(pCodecCtx->hw_device_ctx);
ret = av_hwframe_ctx_init(ist->hw_frames_ctx);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Error initializing a CUDA frame pool\n");
return ret;
}
*/
}
else {
throw InvalidCodec("Hardware device create failed.", path);
}
}
#endif // HAVE_HW_ACCEL
// Disable per-frame threading for album arts
// Using FF_THREAD_FRAME adds one frame decoding delay per thread,
// but there's only one frame in this case.
if (HasAlbumArt())
{
pCodecCtx->thread_type &= ~FF_THREAD_FRAME;
}
// Open video codec
if (avcodec_open2(pCodecCtx, pCodec, &opts) < 0)
throw InvalidCodec("A video codec was found, but could not be opened.", path);
#if HAVE_HW_ACCEL
if (hw_de_on && hw_de_supported) {
AVHWFramesConstraints *constraints = NULL;
void *hwconfig = NULL;
hwconfig = av_hwdevice_hwconfig_alloc(hw_device_ctx);
// TODO: needs va_config!
#if ENABLE_VAAPI
((AVVAAPIHWConfig *)hwconfig)->config_id = ((VAAPIDecodeContext *)(pCodecCtx->priv_data))->va_config;
constraints = av_hwdevice_get_hwframe_constraints(hw_device_ctx,hwconfig);
#endif // ENABLE_VAAPI
if (constraints) {
if (pCodecCtx->coded_width < constraints->min_width ||
pCodecCtx->coded_height < constraints->min_height ||
pCodecCtx->coded_width > constraints->max_width ||
pCodecCtx->coded_height > constraints->max_height) {
ZmqLogger::Instance()->AppendDebugMethod("DIMENSIONS ARE TOO LARGE for hardware acceleration\n");
hw_de_supported = 0;
retry_decode_open = 1;
AV_FREE_CONTEXT(pCodecCtx);
if (hw_device_ctx) {
av_buffer_unref(&hw_device_ctx);
hw_device_ctx = NULL;
}
}
else {
// All is just peachy
ZmqLogger::Instance()->AppendDebugMethod("\nDecode hardware acceleration is used\n", "Min width :", constraints->min_width, "Min Height :", constraints->min_height, "MaxWidth :", constraints->max_width, "MaxHeight :", constraints->max_height, "Frame width :", pCodecCtx->coded_width, "Frame height :", pCodecCtx->coded_height);
retry_decode_open = 0;
}
av_hwframe_constraints_free(&constraints);
if (hwconfig) {
av_freep(&hwconfig);
}
}
else {
int max_h, max_w;
//max_h = ((getenv( "LIMIT_HEIGHT_MAX" )==NULL) ? MAX_SUPPORTED_HEIGHT : atoi(getenv( "LIMIT_HEIGHT_MAX" )));
max_h = openshot::Settings::Instance()->DE_LIMIT_HEIGHT_MAX;
//max_w = ((getenv( "LIMIT_WIDTH_MAX" )==NULL) ? MAX_SUPPORTED_WIDTH : atoi(getenv( "LIMIT_WIDTH_MAX" )));
max_w = openshot::Settings::Instance()->DE_LIMIT_WIDTH_MAX;
ZmqLogger::Instance()->AppendDebugMethod("Constraints could not be found using default limit\n");
//cerr << "Constraints could not be found using default limit\n";
if (pCodecCtx->coded_width < 0 ||
pCodecCtx->coded_height < 0 ||
pCodecCtx->coded_width > max_w ||
pCodecCtx->coded_height > max_h ) {
ZmqLogger::Instance()->AppendDebugMethod("DIMENSIONS ARE TOO LARGE for hardware acceleration\n", "Max Width :", max_w, "Max Height :", max_h, "Frame width :", pCodecCtx->coded_width, "Frame height :", pCodecCtx->coded_height);
hw_de_supported = 0;
retry_decode_open = 1;
AV_FREE_CONTEXT(pCodecCtx);
if (hw_device_ctx) {
av_buffer_unref(&hw_device_ctx);
hw_device_ctx = NULL;
}
}
else {
ZmqLogger::Instance()->AppendDebugMethod("\nDecode hardware acceleration is used\n", "Max Width :", max_w, "Max Height :", max_h, "Frame width :", pCodecCtx->coded_width, "Frame height :", pCodecCtx->coded_height);
retry_decode_open = 0;
}
}
} // if hw_de_on && hw_de_supported
else {
ZmqLogger::Instance()->AppendDebugMethod("\nDecode in software is used\n");
}
#else
retry_decode_open = 0;
#endif // HAVE_HW_ACCEL
} while (retry_decode_open); // retry_decode_open
// Free options
av_dict_free(&opts);
// Update the File Info struct with video details (if a video stream is found)
UpdateVideoInfo();
}
// Is there an audio stream?
if (audioStream != -1) {
// Set the stream index
info.audio_stream_index = audioStream;
// Get a pointer to the codec context for the audio stream
aStream = pFormatCtx->streams[audioStream];
// Find the codec ID from stream
AVCodecID codecId = AV_FIND_DECODER_CODEC_ID(aStream);
// Get codec and codec context from stream
AVCodec *aCodec = avcodec_find_decoder(codecId);
aCodecCtx = AV_GET_CODEC_CONTEXT(aStream, aCodec);
// Set number of threads equal to number of processors (not to exceed 16)
aCodecCtx->thread_count = std::min(FF_NUM_PROCESSORS, 16);
if (aCodec == NULL) {
throw InvalidCodec("A valid audio codec could not be found for this file.", path);
}
// Init options
AVDictionary *opts = NULL;
av_dict_set(&opts, "strict", "experimental", 0);
// Open audio codec
if (avcodec_open2(aCodecCtx, aCodec, &opts) < 0)
throw InvalidCodec("An audio codec was found, but could not be opened.", path);
// Free options
av_dict_free(&opts);
// Update the File Info struct with audio details (if an audio stream is found)
UpdateAudioInfo();
}
// Add format metadata (if any)
AVDictionaryEntry *tag = NULL;
while ((tag = av_dict_get(pFormatCtx->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
QString str_key = tag->key;
QString str_value = tag->value;
info.metadata[str_key.toStdString()] = str_value.trimmed().toStdString();
}
// Init previous audio location to zero
previous_packet_location.frame = -1;
previous_packet_location.sample_start = 0;
// Adjust cache size based on size of frame and audio
working_cache.SetMaxBytesFromInfo(max_concurrent_frames * info.fps.ToDouble() * 2, info.width, info.height, info.sample_rate, info.channels);
missing_frames.SetMaxBytesFromInfo(max_concurrent_frames * 2, info.width, info.height, info.sample_rate, info.channels);
final_cache.SetMaxBytesFromInfo(max_concurrent_frames * 2, info.width, info.height, info.sample_rate, info.channels);
// Mark as "open"
is_open = true;
}
}
void FFmpegReader::Close() {
// Close all objects, if reader is 'open'
if (is_open) {
// Mark as "closed"
is_open = false;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::Close");
if (packet) {
// Remove previous packet before getting next one
RemoveAVPacket(packet);
packet = NULL;
}
// Close the codec
if (info.has_video) {
avcodec_flush_buffers(pCodecCtx);
AV_FREE_CONTEXT(pCodecCtx);
#if HAVE_HW_ACCEL
if (hw_de_on) {
if (hw_device_ctx) {
av_buffer_unref(&hw_device_ctx);
hw_device_ctx = NULL;
}
}
#endif // HAVE_HW_ACCEL
}
if (info.has_audio) {
avcodec_flush_buffers(aCodecCtx);
AV_FREE_CONTEXT(aCodecCtx);
}
// Clear final cache
final_cache.Clear();
working_cache.Clear();
missing_frames.Clear();
// Clear processed lists
{
const GenericScopedLock <CriticalSection> lock(processingCriticalSection);
processed_video_frames.clear();
processed_audio_frames.clear();
processing_video_frames.clear();
processing_audio_frames.clear();
missing_audio_frames.clear();
missing_video_frames.clear();
missing_audio_frames_source.clear();
missing_video_frames_source.clear();
checked_frames.clear();
}
// Close the video file
avformat_close_input(&pFormatCtx);
av_freep(&pFormatCtx);
// Reset some variables
last_frame = 0;
largest_frame_processed = 0;
seek_audio_frame_found = 0;
seek_video_frame_found = 0;
current_video_frame = 0;
has_missing_frames = false;
last_video_frame.reset();
}
}
bool FFmpegReader::HasAlbumArt() {
// Check if the video stream we use is an attached picture
// This won't return true if the file has a cover image as a secondary stream
// like an MKV file with an attached image file
return pFormatCtx && videoStream >= 0 && pFormatCtx->streams[videoStream]
&& (pFormatCtx->streams[videoStream]->disposition & AV_DISPOSITION_ATTACHED_PIC);
}
void FFmpegReader::UpdateAudioInfo() {
// Set values of FileInfo struct
info.has_audio = true;
info.file_size = pFormatCtx->pb ? avio_size(pFormatCtx->pb) : -1;
info.acodec = aCodecCtx->codec->name;
info.channels = AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->channels;
if (AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->channel_layout == 0)
AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->channel_layout = av_get_default_channel_layout(AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->channels);
info.channel_layout = (ChannelLayout) AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->channel_layout;
info.sample_rate = AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->sample_rate;
info.audio_bit_rate = AV_GET_CODEC_ATTRIBUTES(aStream, aCodecCtx)->bit_rate;
// Set audio timebase
info.audio_timebase.num = aStream->time_base.num;
info.audio_timebase.den = aStream->time_base.den;
// Get timebase of audio stream (if valid) and greater than the current duration
if (aStream->duration > 0.0f && aStream->duration > info.duration)
info.duration = aStream->duration * info.audio_timebase.ToDouble();
// Check for an invalid video length
if (info.has_video && info.video_length <= 0) {
// Calculate the video length from the audio duration
info.video_length = info.duration * info.fps.ToDouble();
}
// Set video timebase (if no video stream was found)
if (!info.has_video) {
// Set a few important default video settings (so audio can be divided into frames)
info.fps.num = 24;
info.fps.den = 1;
info.video_timebase.num = 1;
info.video_timebase.den = 24;
info.video_length = info.duration * info.fps.ToDouble();
info.width = 720;
info.height = 480;
}
// Fix invalid video lengths for certain types of files (MP3 for example)
if (info.has_video && ((info.duration * info.fps.ToDouble()) - info.video_length > 60)) {
info.video_length = info.duration * info.fps.ToDouble();
}
// Add audio metadata (if any found)
AVDictionaryEntry *tag = NULL;
while ((tag = av_dict_get(aStream->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
QString str_key = tag->key;
QString str_value = tag->value;
info.metadata[str_key.toStdString()] = str_value.trimmed().toStdString();
}
}
void FFmpegReader::UpdateVideoInfo() {
if (check_fps)
// Already initialized all the video metadata, no reason to do it again
return;
// Set values of FileInfo struct
info.has_video = true;
info.file_size = pFormatCtx->pb ? avio_size(pFormatCtx->pb) : -1;
info.height = AV_GET_CODEC_ATTRIBUTES(pStream, pCodecCtx)->height;
info.width = AV_GET_CODEC_ATTRIBUTES(pStream, pCodecCtx)->width;
info.vcodec = pCodecCtx->codec->name;
info.video_bit_rate = (pFormatCtx->bit_rate / 8);
// Frame rate from the container and codec
AVRational framerate = av_guess_frame_rate(pFormatCtx, pStream, NULL);
info.fps.num = framerate.num;
info.fps.den = framerate.den;
ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::UpdateVideoInfo", "info.fps.num", info.fps.num, "info.fps.den", info.fps.den);
// TODO: remove excessive debug info in the next releases
// The debug info below is just for comparison and troubleshooting on users side during the transition period
ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::UpdateVideoInfo (pStream->avg_frame_rate)", "num", pStream->avg_frame_rate.num, "den", pStream->avg_frame_rate.den);
if (pStream->sample_aspect_ratio.num != 0) {
info.pixel_ratio.num = pStream->sample_aspect_ratio.num;
info.pixel_ratio.den = pStream->sample_aspect_ratio.den;
} else if (AV_GET_CODEC_ATTRIBUTES(pStream, pCodecCtx)->sample_aspect_ratio.num != 0) {
info.pixel_ratio.num = AV_GET_CODEC_ATTRIBUTES(pStream, pCodecCtx)->sample_aspect_ratio.num;
info.pixel_ratio.den = AV_GET_CODEC_ATTRIBUTES(pStream, pCodecCtx)->sample_aspect_ratio.den;
} else {
info.pixel_ratio.num = 1;
info.pixel_ratio.den = 1;
}
info.pixel_format = AV_GET_CODEC_PIXEL_FORMAT(pStream, pCodecCtx);
// Calculate the DAR (display aspect ratio)
Fraction size(info.width * info.pixel_ratio.num, info.height * info.pixel_ratio.den);
// Reduce size fraction
size.Reduce();
// Set the ratio based on the reduced fraction
info.display_ratio.num = size.num;
info.display_ratio.den = size.den;
// Get scan type and order from codec context/params
if (!check_interlace) {
check_interlace = true;
AVFieldOrder field_order = AV_GET_CODEC_ATTRIBUTES(pStream, pCodecCtx)->field_order;
switch(field_order) {
case AV_FIELD_PROGRESSIVE:
info.interlaced_frame = false;
break;
case AV_FIELD_TT:
case AV_FIELD_TB:
info.interlaced_frame = true;
info.top_field_first = true;
break;
case AV_FIELD_BT:
case AV_FIELD_BB:
info.interlaced_frame = true;
info.top_field_first = false;
break;
case AV_FIELD_UNKNOWN:
// Check again later?
check_interlace = false;
break;
}
// check_interlace will prevent these checks being repeated,
// unless it was cleared because we got an AV_FIELD_UNKNOWN response.
}
// Set the video timebase
info.video_timebase.num = pStream->time_base.num;
info.video_timebase.den = pStream->time_base.den;
// Set the duration in seconds, and video length (# of frames)
info.duration = pStream->duration * info.video_timebase.ToDouble();
// Check for valid duration (if found)
if (info.duration <= 0.0f && pFormatCtx->duration >= 0)
// Use the format's duration
info.duration = pFormatCtx->duration / AV_TIME_BASE;
// Calculate duration from filesize and bitrate (if any)
if (info.duration <= 0.0f && info.video_bit_rate > 0 && info.file_size > 0)
// Estimate from bitrate, total bytes, and framerate
info.duration = (info.file_size / info.video_bit_rate);
// No duration found in stream of file
if (info.duration <= 0.0f) {
// No duration is found in the video stream
info.duration = -1;
info.video_length = -1;
is_duration_known = false;
} else {
// Yes, a duration was found
is_duration_known = true;
// Calculate number of frames
info.video_length = round(info.duration * info.fps.ToDouble());
}
// Override an invalid framerate
if (info.fps.ToFloat() > 240.0f || (info.fps.num <= 0 || info.fps.den <= 0) || info.video_length <= 0) {
// Calculate FPS, duration, video bit rate, and video length manually
// by scanning through all the video stream packets
CheckFPS();
}
// Add video metadata (if any)
AVDictionaryEntry *tag = NULL;
while ((tag = av_dict_get(pStream->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
QString str_key = tag->key;
QString str_value = tag->value;
info.metadata[str_key.toStdString()] = str_value.trimmed().toStdString();
}
}
bool FFmpegReader::GetIsDurationKnown() {
return this->is_duration_known;
}
std::shared_ptr<Frame> FFmpegReader::GetFrame(int64_t requested_frame) {
// Check for open reader (or throw exception)
if (!is_open)
throw ReaderClosed("The FFmpegReader is closed. Call Open() before calling this method.", path);
// Adjust for a requested frame that is too small or too large
if (requested_frame < 1)
requested_frame = 1;
if (requested_frame > info.video_length && is_duration_known)
requested_frame = info.video_length;
if (info.has_video && info.video_length == 0)
// Invalid duration of video file
throw InvalidFile("Could not detect the duration of the video or audio stream.", path);
// Debug output
ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::GetFrame", "requested_frame", requested_frame, "last_frame", last_frame);
// Check the cache for this frame
std::shared_ptr<Frame> frame = final_cache.GetFrame(requested_frame);
if (frame) {
// Debug output
ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::GetFrame", "returned cached frame", requested_frame);
// Return the cached frame
return frame;
} else {
// Check the cache a 2nd time (due to a potential previous lock)
frame = final_cache.GetFrame(requested_frame);
if (frame) {
// Debug output
ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::GetFrame", "returned cached frame on 2nd look", requested_frame);
// Return the cached frame
} else {
// Frame is not in cache
// Reset seek count
seek_count = 0;
// Check for first frame (always need to get frame 1 before other frames, to correctly calculate offsets)
if (last_frame == 0 && requested_frame != 1)
// Get first frame
ReadStream(1);
// Are we within X frames of the requested frame?
int64_t diff = requested_frame - last_frame;
if (diff >= 1 && diff <= 20) {
// Continue walking the stream
frame = ReadStream(requested_frame);
} else {
// Greater than 30 frames away, or backwards, we need to seek to the nearest key frame
if (enable_seek)
// Only seek if enabled
Seek(requested_frame);
else if (!enable_seek && diff < 0) {
// Start over, since we can't seek, and the requested frame is smaller than our position
Close();
Open();
}
// Then continue walking the stream
frame = ReadStream(requested_frame);
}
}
return frame;
}
}
// Read the stream until we find the requested Frame
std::shared_ptr<Frame> FFmpegReader::ReadStream(int64_t requested_frame) {
// Allocate video frame
bool end_of_stream = false;
bool check_seek = false;
bool frame_finished = false;
int packet_error = -1;
// Minimum number of packets to process (for performance reasons)
int packets_processed = 0;
int minimum_packets = 1;
int max_packets = 4096;
// Debug output
ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::ReadStream", "requested_frame", requested_frame, "max_concurrent_frames", max_concurrent_frames);
// Loop through the stream until the correct frame is found
while (true) {
// Get the next packet into a local variable called packet
packet_error = GetNextPacket();
int processing_video_frames_size = 0;
int processing_audio_frames_size = 0;
{
const GenericScopedLock <CriticalSection> lock(processingCriticalSection);
processing_video_frames_size = processing_video_frames.size();
processing_audio_frames_size = processing_audio_frames.size();
}
// Wait if too many frames are being processed
while (processing_video_frames_size + processing_audio_frames_size >= minimum_packets) {
std::this_thread::sleep_for(std::chrono::milliseconds(3));
const GenericScopedLock <CriticalSection> lock(processingCriticalSection);
processing_video_frames_size = processing_video_frames.size();
processing_audio_frames_size = processing_audio_frames.size();
}
// Get the next packet (if any)
if (packet_error < 0) {
// Break loop when no more packets found
end_of_stream = true;
break;
}
// Debug output
ZmqLogger::Instance()->AppendDebugMethod("FFmpegReader::ReadStream (GetNextPacket)", "requested_frame", requested_frame, "processing_video_frames_size", processing_video_frames_size, "processing_audio_frames_size", processing_audio_frames_size, "minimum_packets", minimum_packets, "packets_processed", packets_processed, "is_seeking", is_seeking);
// Video packet
if (info.has_video && packet->stream_index == videoStream) {
// Reset this counter, since we have a video packet
num_packets_since_video_frame = 0;
// Check the status of a seek (if any)
if (is_seeking) {
check_seek = CheckSeek(true);
} else {
check_seek = false;
}
if (check_seek) {
// Jump to the next iteration of this loop
continue;
}
// Packet may become NULL on Close inside Seek if CheckSeek returns false
if (!packet) {
// Jump to the next iteration of this loop
continue;
}
// Get the AVFrame from the current packet
frame_finished = GetAVFrame();
// Check if the AVFrame is finished and set it
if (frame_finished) {
// Update PTS / Frame Offset (if any)
UpdatePTSOffset(true);
// Process Video Packet
ProcessVideoPacket(requested_frame);
}
}
// Audio packet
else if (info.has_audio && packet->stream_index == audioStream) {
// Increment this (to track # of packets since the last video packet)
num_packets_since_video_frame++;
// Check the status of a seek (if any)
if (is_seeking) {
check_seek = CheckSeek(false);
} else {
check_seek = false;
}
if (check_seek) {
// Jump to the next iteration of this loop
continue;
}
// Packet may become NULL on Close inside Seek if CheckSeek returns false
if (!packet) {
// Jump to the next iteration of this loop
continue;
}
// Update PTS / Frame Offset (if any)
UpdatePTSOffset(false);
// Determine related video frame and starting sample # from audio PTS
AudioLocation location = GetAudioPTSLocation(packet->pts);
// Process Audio Packet
ProcessAudioPacket(requested_frame, location.frame, location.sample_start);
}