wire up the playing screen with some real data

Includes implementing song duration calculation for CBR MP3 files

3 files changed, 19 insertions, 6 deletions

diff --git a/src/codecs/foxenflac.cpp b/src/codecs/foxenflac.cpp
index a2d6f000..ee21da65 100644
--- a/src/codecs/foxenflac.cpp
+++ b/src/codecs/foxenflac.cpp
@@ -43,6 +43,7 @@ auto FoxenFlacDecoder::BeginStream(const cpp::span<const std::byte> input)
               .num_channels = static_cast<uint8_t>(channels),
               .bits_per_sample = 32,  // libfoxenflac output is fixed-size.
               .sample_rate_hz = static_cast<uint32_t>(fs),
+              .duration_seconds = {},
           }};
 }
 
diff --git a/src/codecs/include/codec.hpp b/src/codecs/include/codec.hpp
index 4b5ab47f..299b16e4 100644
--- a/src/codecs/include/codec.hpp
+++ b/src/codecs/include/codec.hpp
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <stdint.h>
+#include <sys/_stdint.h>
 
 #include <cstddef>
 #include <cstdint>
@@ -50,6 +51,9 @@ class ICodec {
     uint8_t num_channels;
     uint8_t bits_per_sample;
     uint32_t sample_rate_hz;
+
+    std::optional<uint32_t> duration_seconds;
+    std::optional<uint32_t> bits_per_second;
   };
 
   /*
diff --git a/src/codecs/mad.cpp b/src/codecs/mad.cpp
index 23b4ccf6..81daeb9f 100644
--- a/src/codecs/mad.cpp
+++ b/src/codecs/mad.cpp
@@ -6,6 +6,7 @@
 
 #include "mad.hpp"
 #include <stdint.h>
+#include <sys/_stdint.h>
 
 #include <cstdint>
 #include <optional>
@@ -79,12 +80,19 @@ auto MadMp3Decoder::BeginStream(const cpp::span<const std::byte> input)
   }
 
   uint8_t channels = MAD_NCHANNELS(&header);
-  return {GetBytesUsed(input.size_bytes()),
-          OutputFormat{
-              .num_channels = channels,
-              .bits_per_sample = 24,  // We always scale to 24 bits
-              .sample_rate_hz = header.samplerate,
-          }};
+  OutputFormat output{
+      .num_channels = channels,
+      .bits_per_sample = 24,  // We always scale to 24 bits
+      .sample_rate_hz = header.samplerate,
+      .duration_seconds = {},
+      .bits_per_second = {},
+  };
+
+  // TODO(jacqueline): Support VBR. Although maybe libtags is the better place
+  // to handle this?
+  output.bits_per_second = header.bitrate;
+
+  return {GetBytesUsed(input.size_bytes()), output};
 }
 
 auto MadMp3Decoder::ContinueStream(cpp::span<const std::byte> input,