Semi working version

.gitignore

@@ -1,2 +1,5 @@
 /build/sdlamp2
 /build/sdlamp2.dSYM
+*.mp3
+*.m4a
+

build.sh

@@ -1,11 +1,15 @@
 #!/bin/sh
 
-pushd build
+pushd build 2>&1 >/dev/null
 
-gcc -Wall -O0 -ggdb3 \
+gcc -Wall -Wno-unused -O0 -ggdb3 \
   -o sdlamp2 \
   `sdl2-config --cflags --libs` \
+  `pkgconf --cflags --libs libavformat` \
+  `pkgconf --cflags --libs libavcodec` \
+  `pkgconf --cflags --libs libavutil` \
+  `pkgconf --cflags --libs libswresample` \
   -lSDL2_image \
   ../src/sdlamp2.c
 
-popd
+popd 2>&1 >/dev/null

src/sdlamp2.c

@@ -1,25 +1,29 @@
+#include <libavcodec/avcodec.h>
+#include <libavformat/avformat.h>
+#include <libavutil/avutil.h>
+
 #include "SDL.h"
 #include "SDL_image.h"
 
-static SDL_Window *window = NULL;
+static SDL_Window* window = NULL;
-static SDL_Renderer *renderer = NULL;
+static SDL_Renderer* renderer = NULL;
 
 static SDL_AudioDeviceID audio_device = 0;
-static Uint8 *wavbuf = NULL;
+static Uint8* wavbuf = NULL;
 static Uint32 wavlen = 0;
 static SDL_AudioSpec wavspec;
-static SDL_AudioStream *stream = NULL;
+static SDL_AudioStream* stream = NULL;
 // static SDL_bool paused = SDL_TRUE;
 static SDL_bool paused = SDL_FALSE;
 
-static void panic_and_abort(const char *title, const char *text) {
+static void panic_and_abort(const char* title, const char* text) {
   fprintf(stderr, "PANIC: %s ... %s\n", title, text);
   SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, title, text, window);
   SDL_Quit();
   exit(1);
 }
 
-static SDL_bool load_audio_file(const char *fname) {
+static SDL_bool load_audio_file(const char* fname) {
   SDL_FreeAudioStream(stream);
   stream = NULL;
   SDL_FreeWAV(wavbuf);
@@ -27,24 +31,21 @@ static SDL_bool load_audio_file(const char *fname) {
   wavlen = 0;
 
   if (SDL_LoadWAV(fname, &wavspec, &wavbuf, &wavlen) == NULL) {
-    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't load wav file!",
+    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't load wav file!", SDL_GetError(),
-                             SDL_GetError(), window);
+                             window);
     return SDL_FALSE;
   }
 
-  stream = SDL_NewAudioStream(wavspec.format, wavspec.channels, wavspec.freq,
+  stream = SDL_NewAudioStream(wavspec.format, wavspec.channels, wavspec.freq, AUDIO_F32, 2, 48000);
-                              AUDIO_F32, 2, 48000);
   if (!stream) {
-    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR,
+    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't create audio stream!", SDL_GetError(),
-                             "Couldn't create audio stream!", SDL_GetError(),
                              window);
     SDL_FreeWAV(wavbuf);
     wavbuf = NULL;
     wavlen = 0;
   }
 
-  if (SDL_AudioStreamPut(stream, wavbuf, wavlen) ==
+  if (SDL_AudioStreamPut(stream, wavbuf, wavlen) == -1) {  // FIXME(m): graceful handling.
-      -1) { // FIXME(m): graceful handling.
     panic_and_abort("Audio stream put failed!", SDL_GetError());
   }
   SDL_AudioStreamFlush(stream);  // FIXME(m): error handling.
@@ -53,7 +54,76 @@ static SDL_bool load_audio_file(const char *fname) {
   return SDL_TRUE;
 }
 
-int main(int argc, char **argv) {
+static SDL_bool decode_audio() {
+  printf("libavutil version: %s\n", av_version_info());
+
+  // Trying to open and decode AAC / ALAC (.m4a file) with ffmpeg libraries
+  AVFormatContext* pFormatContext = avformat_alloc_context();
+  if (avformat_open_input(&pFormatContext, "./build/music.m4a", NULL, NULL) != 0) {
+    printf("ERROR: could not open the file!\n");
+    return SDL_FALSE;
+  }
+  printf("Format: %s\n", pFormatContext->iformat->long_name);
+
+  avformat_find_stream_info(pFormatContext, NULL);
+  if (pFormatContext->nb_streams < 1) {
+    printf("ERROR: no valid streams found in file!\n");
+    return SDL_FALSE;
+  }
+
+  AVCodecParameters* pLocalCodecParameters = pFormatContext->streams[0]->codecpar;
+  if (pLocalCodecParameters->codec_type != AVMEDIA_TYPE_AUDIO) {
+    printf("ERROR: no audio stream found in file!\n");
+    return SDL_FALSE;
+  }
+
+  printf("Audio stream: %d channels, sample rate %d\n",
+         pLocalCodecParameters->ch_layout.nb_channels, pLocalCodecParameters->sample_rate);
+
+  const AVCodec* pLocalCodec = avcodec_find_decoder(pLocalCodecParameters->codec_id);
+  printf("Codec: %s ID %d bit_rate %lld\n", pLocalCodec->long_name, pLocalCodec->id,
+         pLocalCodecParameters->bit_rate);
+
+  AVCodecContext* pCodecContext = avcodec_alloc_context3(pLocalCodec);
+  avcodec_parameters_to_context(pCodecContext, pLocalCodecParameters);
+  avcodec_open2(pCodecContext, pLocalCodec, NULL);
+
+  AVPacket* pPacket = av_packet_alloc();
+  AVFrame* pFrame = av_frame_alloc();
+
+  SDL_FreeAudioStream(stream);
+  stream = NULL;
+  wavlen = 0;
+
+  stream = SDL_NewAudioStream(AUDIO_F32, pLocalCodecParameters->ch_layout.nb_channels,
+                              pLocalCodecParameters->sample_rate, AUDIO_F32, 2, 48000);
+  if (!stream) {
+    SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Couldn't create audio stream!", SDL_GetError(),
+                             window);
+  }
+
+  while (av_read_frame(pFormatContext, pPacket) >= 0) {
+    if (!avcodec_send_packet(pCodecContext, pPacket)) {
+      avcodec_receive_frame(pCodecContext, pFrame);
+      if (pFrame->linesize[0] > 0) {
+        if (SDL_AudioStreamPut(stream, pFrame->data[0], pFrame->linesize[0]) ==
+            -1) {  // FIXME(m): graceful handling.
+          panic_and_abort("Audio stream put failed!", SDL_GetError());
+        }
+      }
+    }
+
+    // printf("Frame %c (%lld) pts %lld dts %lld\n", av_get_picture_type_char(pFrame->pict_type),
+    //        pCodecContext->frame_num, pFrame->pts, pFrame->pkt_dts);
+  }
+
+  SDL_AudioStreamFlush(stream);  // FIXME(m): error handling.
+  SDL_PauseAudioDevice(audio_device, paused);
+
+  return SDL_TRUE;
+}
+
+int main(int argc, char** argv) {
   SDL_AudioSpec desired;
   SDL_bool running = SDL_TRUE;
   const SDL_Rect rewind_rect = {10, 10, 100, 100};
@@ -71,8 +141,8 @@ int main(int argc, char **argv) {
     panic_and_abort("SDL_Init failed!", SDL_GetError());
   }
 
-  window = SDL_CreateWindow("SDLamp2", SDL_WINDOWPOS_UNDEFINED,
+  window =
-                            SDL_WINDOWPOS_UNDEFINED, 640, 480, 0);
+      SDL_CreateWindow("SDLamp2", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 640, 480, 0);
   if (!window) {
     panic_and_abort("SDL_CreateWindow failed!", SDL_GetError());
   }
@@ -94,15 +164,15 @@ int main(int argc, char **argv) {
     panic_and_abort("Could not open audio device!", SDL_GetError());
   }
 
-  load_audio_file("music.wav");
+  // load_audio_file("music.wav");
+  decode_audio();
 
-  SDL_Surface *controls_surface = IMG_Load("controls.png");
+  SDL_Surface* controls_surface = IMG_Load("controls.png");
   if (controls_surface == NULL) {
     panic_and_abort("Could not load controls asset!", SDL_GetError());
   }
 
-  SDL_Texture *controls_texture =
+  SDL_Texture* controls_texture = SDL_CreateTextureFromSurface(renderer, controls_surface);
-      SDL_CreateTextureFromSurface(renderer, controls_surface);
   SDL_FreeSurface(controls_surface);
   if (controls_texture == NULL) {
     panic_and_abort("Could not load controls asset!", SDL_GetError());
@@ -119,16 +189,15 @@ int main(int argc, char **argv) {
 
         case SDL_MOUSEBUTTONDOWN: {
           const SDL_Point pt = {e.button.x, e.button.y};
-        if (SDL_PointInRect(&pt, &rewind_rect)) { // Pressed the "rewind" button
+          if (SDL_PointInRect(&pt,
+                              &rewind_rect)) {  // Pressed the "rewind" button
             SDL_ClearQueuedAudio(audio_device);
             SDL_AudioStreamClear(stream);
-          if (SDL_AudioStreamPut(stream, wavbuf, wavlen) ==
+            if (SDL_AudioStreamPut(stream, wavbuf, wavlen) == -1) {  // FIXME(m): graceful handling.
-              -1) { // FIXME(m): graceful handling.
               panic_and_abort("Audio stream put failed!", SDL_GetError());
             }
             SDL_AudioStreamFlush(stream);  // FIXME(m): error handling.
-        } else if (SDL_PointInRect(
+          } else if (SDL_PointInRect(&pt,
-                       &pt,
                                      &play_pause_rect)) {  // Pressed the "pause" button
             paused = paused ? SDL_FALSE : SDL_TRUE;
             SDL_PauseAudioDevice(audio_device, paused);
@@ -160,18 +229,14 @@ int main(int argc, char **argv) {
     SDL_RenderFillRect(renderer, &play_pause_rect);
     SDL_RenderFillRect(renderer, &fast_forward_rect);
 
-    SDL_RenderCopy(renderer, controls_texture, &rewind_symbol_rect,
+    SDL_RenderCopy(renderer, controls_texture, &rewind_symbol_rect, &rewind_rect);
-                   &rewind_rect);
     SDL_RenderCopy(renderer, controls_texture, &stop_symbol_rect, &stop_rect);
     if (paused) {
-      SDL_RenderCopy(renderer, controls_texture, &play_symbol_rect,
+      SDL_RenderCopy(renderer, controls_texture, &play_symbol_rect, &play_pause_rect);
-                     &play_pause_rect);
     } else {
-      SDL_RenderCopy(renderer, controls_texture, &pause_symbol_rect,
+      SDL_RenderCopy(renderer, controls_texture, &pause_symbol_rect, &play_pause_rect);
-                     &play_pause_rect);
     }
-    SDL_RenderCopy(renderer, controls_texture, &fast_forward_symbol_rect,
+    SDL_RenderCopy(renderer, controls_texture, &fast_forward_symbol_rect, &fast_forward_rect);
-                   &fast_forward_rect);
 
     SDL_RenderPresent(renderer);
   }