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#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavfilter/avfilter.h>
#include <libavfilter/buffersink.h>
#include <libavfilter/buffersrc.h>
#include <string.h>
#ifdef _WIN32
#include <windows.h>
#else
#include <pthread.h>
#endif
#ifdef _WIN32
static CRITICAL_SECTION json_mutex;
static CONDITION_VARIABLE json_cond;
static int mutex_initialized = 0;
#else
static pthread_mutex_t json_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t json_cond = PTHREAD_COND_INITIALIZER;
#endif
static char json_buffer[2048] = {0};
static int json_captured = 0;
// Custom logging callback
static void logging_callback(void *ptr, int level, const char *fmt, va_list vl) {
char line[2048];
vsnprintf(line, sizeof(line), fmt, vl);
const char *json_start = strstr(line, "{");
if (json_start) {
#ifdef _WIN32
EnterCriticalSection(&json_mutex);
#else
pthread_mutex_lock(&json_mutex);
#endif
strncpy(json_buffer, json_start, sizeof(json_buffer) - 1);
json_captured = 1;
#ifdef _WIN32
WakeConditionVariable(&json_cond);
LeaveCriticalSection(&json_mutex);
#else
pthread_cond_signal(&json_cond);
pthread_mutex_unlock(&json_mutex);
#endif
}
}
char* loudnorm_get_stats(
AVFormatContext* fmt_ctx,
int audio_stream_index,
const char* loudnorm_args
) {
char* result = NULL;
json_captured = 0; // Reset the captured flag
memset(json_buffer, 0, sizeof(json_buffer)); // Clear the buffer
#ifdef _WIN32
// Initialize synchronization objects if needed
if (!mutex_initialized) {
InitializeCriticalSection(&json_mutex);
InitializeConditionVariable(&json_cond);
mutex_initialized = 1;
}
#endif
av_log_set_callback(logging_callback);
AVFilterGraph *filter_graph = NULL;
AVFilterContext *src_ctx = NULL, *sink_ctx = NULL, *loudnorm_ctx = NULL;
AVCodec *codec = NULL;
AVCodecContext *codec_ctx = NULL;
int ret;
AVCodecParameters *codecpar = fmt_ctx->streams[audio_stream_index]->codecpar;
codec = (AVCodec *)avcodec_find_decoder(codecpar->codec_id);
codec_ctx = avcodec_alloc_context3(codec);
avcodec_parameters_to_context(codec_ctx, codecpar);
avcodec_open2(codec_ctx, codec, NULL);
char ch_layout_str[64];
av_channel_layout_describe(&codecpar->ch_layout, ch_layout_str, sizeof(ch_layout_str));
filter_graph = avfilter_graph_alloc();
char args[512];
snprintf(args, sizeof(args),
"time_base=%d/%d:sample_rate=%d:sample_fmt=%s:channel_layout=%s",
fmt_ctx->streams[audio_stream_index]->time_base.num,
fmt_ctx->streams[audio_stream_index]->time_base.den,
codecpar->sample_rate,
av_get_sample_fmt_name(codec_ctx->sample_fmt),
ch_layout_str);
avfilter_graph_create_filter(&src_ctx, avfilter_get_by_name("abuffer"),
"src", args, NULL, filter_graph);
avfilter_graph_create_filter(&sink_ctx, avfilter_get_by_name("abuffersink"),
"sink", NULL, NULL, filter_graph);
avfilter_graph_create_filter(&loudnorm_ctx, avfilter_get_by_name("loudnorm"),
"loudnorm", loudnorm_args, NULL, filter_graph);
avfilter_link(src_ctx, 0, loudnorm_ctx, 0);
avfilter_link(loudnorm_ctx, 0, sink_ctx, 0);
avfilter_graph_config(filter_graph, NULL);
AVPacket *packet = av_packet_alloc();
AVFrame *frame = av_frame_alloc();
AVFrame *filt_frame = av_frame_alloc();
while ((ret = av_read_frame(fmt_ctx, packet)) >= 0) {
if (packet->stream_index != audio_stream_index) {
av_packet_unref(packet);
continue;
}
ret = avcodec_send_packet(codec_ctx, packet);
if (ret < 0) {
av_packet_unref(packet);
continue;
}
while (ret >= 0) {
ret = avcodec_receive_frame(codec_ctx, frame);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) break;
if (ret < 0) goto end;
ret = av_buffersrc_add_frame_flags(src_ctx, frame, AV_BUFFERSRC_FLAG_KEEP_REF);
if (ret < 0) goto end;
while (1) {
ret = av_buffersink_get_frame(sink_ctx, filt_frame);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) break;
if (ret < 0) goto end;
av_frame_unref(filt_frame);
}
}
av_packet_unref(packet);
}
// Flush decoder
avcodec_send_packet(codec_ctx, NULL);
while (avcodec_receive_frame(codec_ctx, frame) >= 0) {
ret = av_buffersrc_add_frame(src_ctx, frame);
if (ret < 0) goto end;
}
// Flush filter
ret = av_buffersrc_add_frame(src_ctx, NULL);
if (ret < 0) goto end;
while (av_buffersink_get_frame(sink_ctx, filt_frame) >= 0) {
av_frame_unref(filt_frame);
}
// Pushes graph
avfilter_graph_free(&filter_graph);
end:
avcodec_free_context(&codec_ctx);
avformat_close_input(&fmt_ctx);
av_frame_free(&filt_frame);
av_frame_free(&frame);
av_packet_free(&packet);
#ifdef _WIN32
EnterCriticalSection(&json_mutex);
while (!json_captured) {
if (!SleepConditionVariableCS(&json_cond, &json_mutex, 5000)) { // 5 second timeout
fprintf(stderr, "Timeout waiting for JSON data\n");
break;
}
}
if (json_captured) {
result = _strdup(json_buffer); // Use _strdup on Windows
}
LeaveCriticalSection(&json_mutex);
#else
struct timespec timeout;
clock_gettime(CLOCK_REALTIME, &timeout);
timeout.tv_sec += 5; // 5 second timeout
pthread_mutex_lock(&json_mutex);
while (json_captured == 0) {
int ret = pthread_cond_timedwait(&json_cond, &json_mutex, &timeout);
if (ret == ETIMEDOUT) {
fprintf(stderr, "Timeout waiting for JSON data\n");
break;
}
}
if (json_captured) {
result = strdup(json_buffer);
}
pthread_mutex_unlock(&json_mutex);
#endif
av_log_set_callback(av_log_default_callback);
return result;
}
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