#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <sys/stat.h>
#include <unistd.h>
extern "C" {
#include "bmusb/bmusb.h"
#include "ffmpeg_raii.h"
+#include "ffmpeg_util.h"
#include "flags.h"
#include "image_input.h"
return origin + duration_cast<steady_clock::duration>(pts / rate);
}
+bool changed_since(const std::string &pathname, const timespec &ts)
+{
+ if (ts.tv_sec < 0) {
+ return false;
+ }
+ struct stat buf;
+ if (stat(pathname.c_str(), &buf) != 0) {
+ fprintf(stderr, "%s: Couldn't check for new version, leaving the old in place.\n", pathname.c_str());
+ return false;
+ }
+ return (buf.st_mtim.tv_sec != ts.tv_sec || buf.st_mtim.tv_nsec != ts.tv_nsec);
+}
+
} // namespace
FFmpegCapture::FFmpegCapture(const string &filename, unsigned width, unsigned height)
{
// Not really used for anything.
description = "Video: " + filename;
+
+ avformat_network_init(); // In case someone wants this.
}
FFmpegCapture::~FFmpegCapture()
string pathname = search_for_file(filename);
if (filename.empty()) {
fprintf(stderr, "%s not found, sleeping one second and trying again...\n", filename.c_str());
+ send_disconnected_frame();
producer_thread_should_quit.sleep_for(seconds(1));
continue;
}
if (!play_video(pathname)) {
// Error.
fprintf(stderr, "Error when playing %s, sleeping one second and trying again...\n", pathname.c_str());
+ send_disconnected_frame();
producer_thread_should_quit.sleep_for(seconds(1));
continue;
}
}
}
+void FFmpegCapture::send_disconnected_frame()
+{
+ // Send an empty frame to signal that we have no signal anymore.
+ FrameAllocator::Frame video_frame = video_frame_allocator->alloc_frame();
+ if (video_frame.data) {
+ VideoFormat video_format;
+ video_format.width = width;
+ video_format.height = height;
+ video_format.stride = width * 4;
+ video_format.frame_rate_nom = 60;
+ video_format.frame_rate_den = 1;
+ video_format.is_connected = false;
+
+ video_frame.len = width * height * 4;
+ memset(video_frame.data, 0, video_frame.len);
+
+ frame_callback(timecode++,
+ video_frame, /*video_offset=*/0, video_format,
+ FrameAllocator::Frame(), /*audio_offset=*/0, AudioFormat());
+ }
+}
+
bool FFmpegCapture::play_video(const string &pathname)
{
+ // Note: Call before open, not after; otherwise, there's a race.
+ // (There is now, too, but it tips the correct way. We could use fstat()
+ // if we had the file descriptor.)
+ timespec last_modified;
+ struct stat buf;
+ if (stat(pathname.c_str(), &buf) != 0) {
+ // Probably some sort of protocol, so can't stat.
+ last_modified.tv_sec = -1;
+ } else {
+ last_modified = buf.st_mtim;
+ }
+
auto format_ctx = avformat_open_input_unique(pathname.c_str(), nullptr, nullptr);
if (format_ctx == nullptr) {
fprintf(stderr, "%s: Error opening file\n", pathname.c_str());
return false;
}
- int video_stream_index = -1, audio_stream_index = -1;
- AVRational video_timebase{ 1, 1 };
- for (unsigned i = 0; i < format_ctx->nb_streams; ++i) {
- if (format_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO &&
- video_stream_index == -1) {
- video_stream_index = i;
- video_timebase = format_ctx->streams[i]->time_base;
- }
- if (format_ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO &&
- audio_stream_index == -1) {
- audio_stream_index = i;
- }
- }
+ int video_stream_index = find_stream_index(format_ctx.get(), AVMEDIA_TYPE_VIDEO);
if (video_stream_index == -1) {
fprintf(stderr, "%s: No video stream found\n", pathname.c_str());
return false;
}
const AVCodecParameters *codecpar = format_ctx->streams[video_stream_index]->codecpar;
+ AVRational video_timebase = format_ctx->streams[video_stream_index]->time_base;
AVCodecContextWithDeleter codec_ctx = avcodec_alloc_context3_unique(nullptr);
if (avcodec_parameters_to_context(codec_ctx.get(), codecpar) < 0) {
fprintf(stderr, "%s: Cannot fill codec parameters\n", pathname.c_str());
if (av_seek_frame(format_ctx.get(), /*stream_index=*/-1, /*timestamp=*/0, /*flags=*/0) < 0) {
fprintf(stderr, "%s: Rewind failed, stopping play.\n", pathname.c_str());
}
+ // If the file has changed since last time, return to get it reloaded.
+ // Note that depending on how you move the file into place, you might
+ // end up corrupting the one you're already playing, so this path
+ // might not trigger.
+ if (changed_since(pathname, last_modified)) {
+ return true;
+ }
internal_rewind();
break;
fprintf(stderr, "%s: Rewind failed, not looping.\n", pathname.c_str());
return true;
}
+ // If the file has changed since last time, return to get it reloaded.
+ // Note that depending on how you move the file into place, you might
+ // end up corrupting the one you're already playing, so this path
+ // might not trigger.
+ if (changed_since(pathname, last_modified)) {
+ return true;
+ }
internal_rewind();
continue;
}
if (sws_ctx == nullptr || sws_last_width != frame->width || sws_last_height != frame->height) {
sws_ctx.reset(
sws_getContext(frame->width, frame->height, (AVPixelFormat)frame->format,
- width, height, AV_PIX_FMT_RGBA,
+ width, height, AV_PIX_FMT_BGRA,
SWS_BICUBIC, nullptr, nullptr, nullptr));
sws_last_width = frame->width;
sws_last_height = frame->height;
video_format.stride = width * 4;
video_format.frame_rate_nom = video_timebase.den;
video_format.frame_rate_den = av_frame_get_pkt_duration(frame.get()) * video_timebase.num;
+ if (video_format.frame_rate_nom == 0 || video_format.frame_rate_den == 0) {
+ // Invalid frame rate.
+ video_format.frame_rate_nom = 60;
+ video_format.frame_rate_den = 1;
+ }
video_format.has_signal = true;
video_format.is_connected = true;
projects / nageru / blobdiff