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Monorepo for Aesthetic.Computer aesthetic.computer
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C
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#ifdef HAVE_AVCODEC
#include "audio-decode.h"#include <stdio.h>#include <stdlib.h>#include <string.h>#include <math.h>
#include <libavcodec/avcodec.h>#include <libavformat/avformat.h>#include <libavutil/opt.h>#include <libavutil/imgutils.h>#include <libavutil/channel_layout.h>#include <libavutil/time.h>#include <libswscale/swscale.h>#include <libswresample/swresample.h>
extern void ac_log(const char *fmt, ...);
// --- Internal helpers ---
// A path is a live network stream (radio) if it's an http(s) URL. Streams// have no duration, can't be seeked, and must not be peak-scanned (that// reads to EOF, which never comes). avformat_network_init() is required// before opening any network protocol; call it once, lazily.static int decoder_network_ready = 0;static int path_is_stream(const char *path) { return path && (strncmp(path, "http://", 7) == 0 || strncmp(path, "https://", 8) == 0);}
static void extract_metadata(ACDeckDecoder *d, AVFormatContext *fmt) { const AVDictionaryEntry *tag = NULL; tag = av_dict_get(fmt->metadata, "title", NULL, 0); if (tag) snprintf(d->title, sizeof(d->title), "%s", tag->value); tag = av_dict_get(fmt->metadata, "artist", NULL, 0); if (tag) snprintf(d->artist, sizeof(d->artist), "%s", tag->value);}
static int ring_available(ACDeckDecoder *d) { return d->ring_write - d->ring_read;}
static int ring_free(ACDeckDecoder *d) { return d->ring_size - ring_available(d);}
static void free_video_preview(ACDeckDecoder *d) { if (!d) return; if (d->video_frames) { free(d->video_frames); d->video_frames = NULL; } d->video_frame_count = 0; d->video_width = 0; d->video_height = 0; d->video_fps = 0.0; d->video_ready = 0;}
// --- Decoder thread ---
static void *decoder_thread_fn(void *arg) { ACDeckDecoder *d = (ACDeckDecoder *)arg; AVFormatContext *fmt_ctx = (AVFormatContext *)d->fmt_ctx; AVCodecContext *codec_ctx = (AVCodecContext *)d->codec_ctx; SwrContext *swr = (SwrContext *)d->swr;
AVPacket *pkt = av_packet_alloc(); AVFrame *frame = av_frame_alloc(); int max_out_samples = 8192; float *resample_buf = NULL; int stream_errs = 0; // consecutive read failures on a live stream
if (!pkt || !frame) { d->error = 1; snprintf(d->error_msg, sizeof(d->error_msg), "alloc failed"); goto done; }
// Temporary buffer for resampled output (enough for one decoded frame) resample_buf = malloc(max_out_samples * 2 * sizeof(float)); // stereo if (!resample_buf) { d->error = 1; snprintf(d->error_msg, sizeof(d->error_msg), "resample buf alloc failed"); goto done; }
while (d->thread_running) { // Handle seek requests if (d->seek_requested) { int64_t ts = (int64_t)(d->seek_target * AV_TIME_BASE); av_seek_frame(fmt_ctx, -1, ts, AVSEEK_FLAG_BACKWARD); avcodec_flush_buffers(codec_ctx); // Reset ring buffer d->ring_write = 0; d->ring_read = 0; d->ring_frac = 0.0; d->position = d->seek_target; d->finished = 0; d->seek_requested = 0; }
// Pause: wait for signal if (!d->decoding) { pthread_mutex_lock(&d->mutex); while (!d->decoding && d->thread_running && !d->seek_requested) { pthread_cond_wait(&d->cond, &d->mutex); } pthread_mutex_unlock(&d->mutex); continue; }
// Ring buffer full: wait until consumer drains below 80% if (ring_free(d) < d->ring_size / 5) { pthread_mutex_lock(&d->mutex); while (ring_free(d) < d->ring_size / 2 && d->thread_running && !d->seek_requested) { pthread_cond_wait(&d->cond, &d->mutex); } pthread_mutex_unlock(&d->mutex); continue; }
// Read next packet int ret = av_read_frame(fmt_ctx, pkt); if (ret < 0) { if (d->is_stream && ret != AVERROR_EOF) { // Live stream hiccup — the reconnect options retry inside // av_read_frame; back off briefly and keep going rather than // killing the deck. Latch an error only after sustained // failure (~5s) so a dead station still surfaces. if (++stream_errs > 50) { d->error = 1; snprintf(d->error_msg, sizeof(d->error_msg), "stream lost"); d->decoding = 0; } else { av_usleep(100000); // 100 ms } } else if (ret == AVERROR_EOF) { d->finished = 1; d->decoding = 0; } else { d->error = 1; snprintf(d->error_msg, sizeof(d->error_msg), "read error: %d", ret); } continue; } stream_errs = 0;
if (pkt->stream_index != d->stream_idx) { av_packet_unref(pkt); continue; }
ret = avcodec_send_packet(codec_ctx, pkt); av_packet_unref(pkt); if (ret < 0) continue;
while (ret >= 0) { ret = avcodec_receive_frame(codec_ctx, frame); if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) break; if (ret < 0) { d->error = 1; break; }
// Resample: source rate -> output rate (always 1x, speed applied at playback) int out_samples = av_rescale_rnd( swr_get_delay(swr, d->src_sample_rate) + frame->nb_samples, d->out_rate, d->src_sample_rate, AV_ROUND_UP );
if (out_samples > max_out_samples) { max_out_samples = out_samples + 1024; float *newbuf = realloc(resample_buf, max_out_samples * 2 * sizeof(float)); if (!newbuf) { d->error = 1; break; } resample_buf = newbuf; }
uint8_t *out_planes[1] = { (uint8_t *)resample_buf }; int converted = swr_convert(swr, out_planes, out_samples, (const uint8_t **)frame->data, frame->nb_samples);
if (converted <= 0) continue;
// Write to ring buffer int free_frames = ring_free(d); int to_write = converted < free_frames ? converted : free_frames;
for (int i = 0; i < to_write; i++) { int wi = (d->ring_write % d->ring_size) * 2; d->ring[wi] = resample_buf[i * 2]; d->ring[wi + 1] = resample_buf[i * 2 + 1]; d->ring_write++; }
// Update position based on decoded frame PTS if (frame->pts != AV_NOPTS_VALUE) { AVStream *st = fmt_ctx->streams[d->stream_idx]; d->position = frame->pts * av_q2d(st->time_base); }
av_frame_unref(frame); } }
done: free(resample_buf); av_packet_free(&pkt); av_frame_free(&frame); return NULL;}
// --- Public API ---
ACDeckDecoder *deck_decoder_create(unsigned int output_rate) { ACDeckDecoder *d = calloc(1, sizeof(ACDeckDecoder)); if (!d) return NULL;
d->out_rate = output_rate; d->speed = 1.0; d->ring_frac = 0.0; d->ring_size = output_rate * DECK_RING_SECONDS; d->ring = calloc(d->ring_size * 2, sizeof(float)); // stereo interleaved if (!d->ring) { free(d); return NULL; }
pthread_mutex_init(&d->mutex, NULL); pthread_cond_init(&d->cond, NULL);
return d;}
int deck_decoder_load(ACDeckDecoder *d, const char *path) { if (!d) return -1;
// Unload any previous file deck_decoder_unload(d);
// Reset state d->loaded = 0; d->finished = 0; d->error = 0; d->error_msg[0] = '\0'; d->title[0] = '\0'; d->artist[0] = '\0'; d->position = 0.0; d->duration = 0.0; d->ring_write = 0; d->ring_read = 0; d->seek_requested = 0; d->speed = 1.0; d->is_stream = path_is_stream(path); snprintf(d->path, sizeof(d->path), "%s", path); free_video_preview(d);
// Open file (or network stream). For radio URLs, set HTTP reconnect + // timeout options so a dropped connection retries instead of erroring // out, and cap the probe so find_stream_info returns quickly on an // endless Icecast MP3. AVDictionary *opts = NULL; if (d->is_stream) { if (!decoder_network_ready) { avformat_network_init(); decoder_network_ready = 1; } av_dict_set(&opts, "reconnect", "1", 0); av_dict_set(&opts, "reconnect_streamed", "1", 0); av_dict_set(&opts, "reconnect_on_network_error", "1", 0); av_dict_set(&opts, "reconnect_delay_max", "5", 0); av_dict_set(&opts, "rw_timeout", "15000000", 0); // 15s in microseconds av_dict_set(&opts, "user_agent", "aesthetic-computer-native", 0); av_dict_set(&opts, "probesize", "131072", 0); // 128 KB av_dict_set(&opts, "analyzeduration", "2000000", 0); // 2s } AVFormatContext *fmt_ctx = NULL; int ret = avformat_open_input(&fmt_ctx, path, NULL, opts ? &opts : NULL); if (opts) av_dict_free(&opts); if (ret < 0) { snprintf(d->error_msg, sizeof(d->error_msg), d->is_stream ? "cannot open stream (TLS/network?)" : "cannot open: %s", path); d->error = 1; return -1; }
ret = avformat_find_stream_info(fmt_ctx, NULL); if (ret < 0) { snprintf(d->error_msg, sizeof(d->error_msg), "no stream info"); avformat_close_input(&fmt_ctx); d->error = 1; return -1; }
// Find best audio stream int stream_idx = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_AUDIO, -1, -1, NULL, 0); if (stream_idx < 0) { snprintf(d->error_msg, sizeof(d->error_msg), "no audio stream"); avformat_close_input(&fmt_ctx); d->error = 1; return -1; }
AVStream *st = fmt_ctx->streams[stream_idx]; const AVCodec *codec = avcodec_find_decoder(st->codecpar->codec_id); if (!codec) { snprintf(d->error_msg, sizeof(d->error_msg), "unsupported codec"); avformat_close_input(&fmt_ctx); d->error = 1; return -1; }
AVCodecContext *codec_ctx = avcodec_alloc_context3(codec); avcodec_parameters_to_context(codec_ctx, st->codecpar); ret = avcodec_open2(codec_ctx, codec, NULL); if (ret < 0) { snprintf(d->error_msg, sizeof(d->error_msg), "codec open failed"); avcodec_free_context(&codec_ctx); avformat_close_input(&fmt_ctx); d->error = 1; return -1; }
// Setup resampler: source format -> stereo float at output rate SwrContext *swr = NULL; AVChannelLayout out_layout = AV_CHANNEL_LAYOUT_STEREO; ret = swr_alloc_set_opts2(&swr, &out_layout, AV_SAMPLE_FMT_FLT, d->out_rate, &codec_ctx->ch_layout, codec_ctx->sample_fmt, codec_ctx->sample_rate, 0, NULL); if (ret < 0 || !swr) { snprintf(d->error_msg, sizeof(d->error_msg), "resampler alloc failed"); avcodec_free_context(&codec_ctx); avformat_close_input(&fmt_ctx); d->error = 1; return -1; } ret = swr_init(swr); if (ret < 0) { snprintf(d->error_msg, sizeof(d->error_msg), "resampler init failed"); swr_free(&swr); avcodec_free_context(&codec_ctx); avformat_close_input(&fmt_ctx); d->error = 1; return -1; }
// Store FFmpeg state d->fmt_ctx = fmt_ctx; d->codec_ctx = codec_ctx; d->swr = swr; d->stream_idx = stream_idx; d->src_sample_rate = codec_ctx->sample_rate; d->src_channels = codec_ctx->ch_layout.nb_channels;
// Duration if (fmt_ctx->duration > 0) d->duration = (double)fmt_ctx->duration / AV_TIME_BASE; else if (st->duration > 0) d->duration = st->duration * av_q2d(st->time_base);
// Metadata extract_metadata(d, fmt_ctx);
// Extract filename as fallback title if (d->title[0] == '\0') { const char *slash = strrchr(path, '/'); const char *name = slash ? slash + 1 : path; snprintf(d->title, sizeof(d->title), "%s", name); // Strip extension char *dot = strrchr(d->title, '.'); if (dot) *dot = '\0'; }
d->loaded = 1; d->decoding = 0; // paused until play() is called
// Start decoder thread d->thread_running = 1; pthread_create(&d->thread, NULL, decoder_thread_fn, d);
ac_log("[deck] loaded: %s (%s - %s, %.1fs, %dHz %dch)\n", path, d->artist, d->title, d->duration, d->src_sample_rate, d->src_channels);
return 0;}
void deck_decoder_play(ACDeckDecoder *d) { if (!d || !d->loaded) return; if (d->finished) { // Restart from beginning d->seek_requested = 1; d->seek_target = 0.0; } d->decoding = 1; pthread_mutex_lock(&d->mutex); pthread_cond_signal(&d->cond); pthread_mutex_unlock(&d->mutex);}
void deck_decoder_pause(ACDeckDecoder *d) { if (!d) return; d->decoding = 0;}
void deck_decoder_seek(ACDeckDecoder *d, double seconds) { if (!d || !d->loaded) return; if (seconds < 0) seconds = 0; if (seconds > d->duration) seconds = d->duration; d->seek_target = seconds; d->seek_requested = 1; // Wake thread if paused pthread_mutex_lock(&d->mutex); pthread_cond_signal(&d->cond); pthread_mutex_unlock(&d->mutex);}
void deck_decoder_set_speed(ACDeckDecoder *d, double speed) { if (!d) return; if (speed < -4.0) speed = -4.0; if (speed > 4.0) speed = 4.0; d->speed = speed;}
void deck_decoder_unload(ACDeckDecoder *d) { if (!d) return;
// Stop thread if (d->thread_running) { d->thread_running = 0; d->decoding = 0; pthread_mutex_lock(&d->mutex); pthread_cond_signal(&d->cond); pthread_mutex_unlock(&d->mutex); pthread_join(d->thread, NULL); }
// Free FFmpeg state if (d->swr) { SwrContext *swr = (SwrContext *)d->swr; swr_free(&swr); d->swr = NULL; } if (d->codec_ctx) { AVCodecContext *ctx = (AVCodecContext *)d->codec_ctx; avcodec_free_context(&ctx); d->codec_ctx = NULL; } if (d->fmt_ctx) { AVFormatContext *fmt = (AVFormatContext *)d->fmt_ctx; avformat_close_input(&fmt); d->fmt_ctx = NULL; }
// Free peaks if (d->peaks) { free(d->peaks); d->peaks = NULL; d->peak_count = 0; } free_video_preview(d);
d->loaded = 0; d->finished = 0; d->decoding = 0; d->ring_write = 0; d->ring_read = 0;}
// Generate decimated max-amplitude peaks for the loaded file.// Opens a SECOND independent FFmpeg context (so it doesn't disturb playback)// and decodes the entire file once, recording max abs value per chunk.int deck_decoder_generate_peaks(ACDeckDecoder *d, int target_count) { if (!d || !d->loaded || !d->path[0]) return -1; if (d->peaks) { free(d->peaks); d->peaks = NULL; d->peak_count = 0; } if (target_count <= 0) target_count = 1024;
AVFormatContext *fmt = NULL; if (avformat_open_input(&fmt, d->path, NULL, NULL) < 0) return -1; if (avformat_find_stream_info(fmt, NULL) < 0) { avformat_close_input(&fmt); return -1; } int sidx = av_find_best_stream(fmt, AVMEDIA_TYPE_AUDIO, -1, -1, NULL, 0); if (sidx < 0) { avformat_close_input(&fmt); return -1; } AVStream *st = fmt->streams[sidx]; const AVCodec *codec = avcodec_find_decoder(st->codecpar->codec_id); if (!codec) { avformat_close_input(&fmt); return -1; } AVCodecContext *cctx = avcodec_alloc_context3(codec); avcodec_parameters_to_context(cctx, st->codecpar); if (avcodec_open2(cctx, codec, NULL) < 0) { avcodec_free_context(&cctx); avformat_close_input(&fmt); return -1; }
// Estimate total samples for chunking double duration = d->duration; if (duration <= 0) duration = 60.0; // fallback int sample_rate = cctx->sample_rate; long total_samples = (long)(duration * sample_rate); if (total_samples < target_count) total_samples = target_count; long samples_per_chunk = total_samples / target_count; if (samples_per_chunk < 1) samples_per_chunk = 1;
d->peaks = (float *)calloc(target_count, sizeof(float)); if (!d->peaks) { avcodec_free_context(&cctx); avformat_close_input(&fmt); return -1; } d->peak_count = target_count;
// Setup converter to mono float SwrContext *swr = NULL; AVChannelLayout out_layout = AV_CHANNEL_LAYOUT_MONO; swr_alloc_set_opts2(&swr, &out_layout, AV_SAMPLE_FMT_FLT, sample_rate, &cctx->ch_layout, cctx->sample_fmt, cctx->sample_rate, 0, NULL); swr_init(swr);
AVPacket *pkt = av_packet_alloc(); AVFrame *frame = av_frame_alloc(); float chunk_max = 0.0f; long sample_idx = 0; int peak_idx = 0; float *outbuf = (float *)malloc(sample_rate * sizeof(float)); int outbuf_size = sample_rate;
while (av_read_frame(fmt, pkt) >= 0 && peak_idx < target_count) { if (pkt->stream_index != sidx) { av_packet_unref(pkt); continue; } if (avcodec_send_packet(cctx, pkt) < 0) { av_packet_unref(pkt); continue; } while (avcodec_receive_frame(cctx, frame) >= 0) { int max_out = frame->nb_samples + 256; if (max_out > outbuf_size) { outbuf = (float *)realloc(outbuf, max_out * sizeof(float)); outbuf_size = max_out; } uint8_t *out_ptr[1] = { (uint8_t *)outbuf }; int out_n = swr_convert(swr, out_ptr, max_out, (const uint8_t **)frame->data, frame->nb_samples); for (int i = 0; i < out_n; i++) { float v = outbuf[i]; if (v < 0) v = -v; if (v > chunk_max) chunk_max = v; sample_idx++; if (sample_idx >= samples_per_chunk) { if (peak_idx < target_count) { d->peaks[peak_idx++] = chunk_max; } chunk_max = 0.0f; sample_idx = 0; } } } av_packet_unref(pkt); } // Final chunk if (peak_idx < target_count && chunk_max > 0) { d->peaks[peak_idx++] = chunk_max; } // Fill remaining while (peak_idx < target_count) d->peaks[peak_idx++] = 0;
free(outbuf); av_frame_free(&frame); av_packet_free(&pkt); swr_free(&swr); avcodec_free_context(&cctx); avformat_close_input(&fmt);
return target_count;}
int deck_decoder_generate_video_preview(ACDeckDecoder *d, int width, int height, int fps) { if (!d || !d->loaded || !d->path[0]) return -1; if (width <= 0) width = 96; if (height <= 0) height = 54; if (fps <= 0) fps = 12; if (fps > 24) fps = 24;
// Reuse cached preview when the request matches the existing buffer. if (d->video_ready && d->video_frames && d->video_width == width && d->video_height == height && fabs(d->video_fps - (double)fps) < 0.001) { return d->video_frame_count; }
free_video_preview(d);
AVFormatContext *fmt = NULL; if (avformat_open_input(&fmt, d->path, NULL, NULL) < 0) return -1; if (avformat_find_stream_info(fmt, NULL) < 0) { avformat_close_input(&fmt); return -1; }
int sidx = av_find_best_stream(fmt, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0); if (sidx < 0) { avformat_close_input(&fmt); return -1; }
AVStream *st = fmt->streams[sidx]; const AVCodec *codec = avcodec_find_decoder(st->codecpar->codec_id); if (!codec) { avformat_close_input(&fmt); return -1; }
AVCodecContext *cctx = avcodec_alloc_context3(codec); if (!cctx) { avformat_close_input(&fmt); return -1; } avcodec_parameters_to_context(cctx, st->codecpar); if (avcodec_open2(cctx, codec, NULL) < 0) { avcodec_free_context(&cctx); avformat_close_input(&fmt); return -1; }
double duration = d->duration; if (duration <= 0.0 && fmt->duration > 0) duration = (double)fmt->duration / AV_TIME_BASE; if (duration <= 0.0 && st->duration > 0) duration = st->duration * av_q2d(st->time_base); if (duration <= 0.0) duration = 30.0;
int target_count = (int)ceil(duration * (double)fps) + 1; if (target_count < 1) target_count = 1; if (target_count > 900) target_count = 900;
size_t pixels_per_frame = (size_t)width * (size_t)height; size_t total_pixels = pixels_per_frame * (size_t)target_count; uint32_t *frames = (uint32_t *)calloc(total_pixels, sizeof(uint32_t)); if (!frames) { avcodec_free_context(&cctx); avformat_close_input(&fmt); return -1; }
struct SwsContext *sws = sws_getContext( cctx->width, cctx->height, cctx->pix_fmt, width, height, AV_PIX_FMT_BGRA, SWS_BILINEAR, NULL, NULL, NULL); if (!sws) { free(frames); avcodec_free_context(&cctx); avformat_close_input(&fmt); return -1; }
AVPacket *pkt = av_packet_alloc(); AVFrame *frame = av_frame_alloc(); if (!pkt || !frame) { av_packet_free(&pkt); av_frame_free(&frame); sws_freeContext(sws); free(frames); avcodec_free_context(&cctx); avformat_close_input(&fmt); return -1; }
uint8_t *last_frame = NULL; int frame_idx = 0; double next_time = 0.0;
while (av_read_frame(fmt, pkt) >= 0 && frame_idx < target_count) { if (pkt->stream_index != sidx) { av_packet_unref(pkt); continue; } if (avcodec_send_packet(cctx, pkt) < 0) { av_packet_unref(pkt); continue; } av_packet_unref(pkt);
while (avcodec_receive_frame(cctx, frame) >= 0 && frame_idx < target_count) { double frame_time = 0.0; if (frame->best_effort_timestamp != AV_NOPTS_VALUE) frame_time = frame->best_effort_timestamp * av_q2d(st->time_base); else if (frame->pts != AV_NOPTS_VALUE) frame_time = frame->pts * av_q2d(st->time_base);
uint8_t *dst_data[4] = {0}; int dst_linesize[4] = {0}; uint32_t *dst = frames + ((size_t)frame_idx * pixels_per_frame); av_image_fill_arrays(dst_data, dst_linesize, (uint8_t *)dst, AV_PIX_FMT_BGRA, width, height, 1);
// Fill every preview sample point that this decoded frame covers. while (frame_idx < target_count && (frame_time >= next_time || frame_idx == 0)) { dst = frames + ((size_t)frame_idx * pixels_per_frame); av_image_fill_arrays(dst_data, dst_linesize, (uint8_t *)dst, AV_PIX_FMT_BGRA, width, height, 1); sws_scale(sws, (const uint8_t * const *)frame->data, frame->linesize, 0, cctx->height, dst_data, dst_linesize); last_frame = (uint8_t *)dst; frame_idx++; next_time = (double)frame_idx / (double)fps; }
av_frame_unref(frame); } }
// Flush decoder for the tail of the file. avcodec_send_packet(cctx, NULL); while (avcodec_receive_frame(cctx, frame) >= 0 && frame_idx < target_count) { uint8_t *dst_data[4] = {0}; int dst_linesize[4] = {0}; uint32_t *dst = frames + ((size_t)frame_idx * pixels_per_frame); av_image_fill_arrays(dst_data, dst_linesize, (uint8_t *)dst, AV_PIX_FMT_BGRA, width, height, 1); sws_scale(sws, (const uint8_t * const *)frame->data, frame->linesize, 0, cctx->height, dst_data, dst_linesize); last_frame = (uint8_t *)dst; frame_idx++; av_frame_unref(frame); }
// Pad remaining preview slots with the final decoded frame so playback // keeps showing a still image once audio reaches the tail. if (last_frame) { while (frame_idx < target_count) { uint32_t *dst = frames + ((size_t)frame_idx * pixels_per_frame); memcpy(dst, last_frame, pixels_per_frame * sizeof(uint32_t)); frame_idx++; } }
av_packet_free(&pkt); av_frame_free(&frame); sws_freeContext(sws); avcodec_free_context(&cctx); avformat_close_input(&fmt);
if (frame_idx <= 0) { free(frames); return -1; }
d->video_frames = frames; d->video_frame_count = frame_idx; d->video_width = width; d->video_height = height; d->video_fps = (double)fps; d->video_ready = 1;
ac_log("[deck] video preview ready: %s (%d frames @ %dx%d %.1ffps)\n", d->path, d->video_frame_count, d->video_width, d->video_height, d->video_fps); return d->video_frame_count;}
void deck_decoder_destroy(ACDeckDecoder *d) { if (!d) return; deck_decoder_unload(d); free(d->ring); pthread_mutex_destroy(&d->mutex); pthread_cond_destroy(&d->cond); free(d);}
#endif // HAVE_AVCODEC