work on audio encoding

src/zm_videostore.cpp

@@ -206,6 +206,13 @@ Debug(2, "Have audio_output_context");
             av_strerror(ret, error_buffer, sizeof(error_buffer));
             Fatal( "could not open codec (%d) (%s)\n", ret, error_buffer );
           } else {
+    /** Create the FIFO buffer based on the specified output sample format. */
+    if (!(fifo = av_audio_fifo_alloc(audio_output_context->sample_fmt,
+                                      audio_output_context->channels, 1))) {
+        Error("Could not allocate FIFO\n");
+        return;
+    }
+  output_frame_size = audio_output_context->frame_size;
             Debug(2, "Success opening AAC codec");
           } 
           av_dict_free(&opts);
@@ -514,6 +521,44 @@ if ( 0 ) {
         zm_av_unref_packet(&opkt);
         return 0;
     }
+    if ( data_present ) {
+
+uint8_t **converted_input_samples = NULL;
+
+    /**
+     * Allocate as many pointers as there are audio channels.
+     * Each pointer will later point to the audio samples of the corresponding
+     * channels (although it may be NULL for interleaved formats).
+     */
+    if (!(converted_input_samples = calloc( audio_output_context->channels, sizeof(*converted_input_samples)))) {
+        Error( "Could not allocate converted input sample pointers\n");
+        return 0;
+    }
+    /**
+     * Allocate memory for the samples of all channels in one consecutive
+     * block for convenience.
+     */
+    if ((ret = av_samples_alloc(converted_input_samples, NULL,
+                                  audio_output_context->channels,
+                                  frame_size,
+                                  audio_output_context->sample_fmt, 0)) < 0) {
+Error( "Could not allocate converted input samples (error '%s')\n",
+av_make_error_string(ret).c_str() );
+               
+        av_freep(&(converted_input_samples)[0]);
+        free(*converted_input_samples);
+        return 0;
+    }
+
+        if ((ret = av_audio_fifo_realloc(fifo, av_audio_fifo_size(fifo) + frame_size)) < 0) {
+        Error( "Could not reallocate FIFO\n");
+        return 0;
+    }
+    /** Store the new samples in the FIFO buffer. */
+    if (av_audio_fifo_write(fifo, (void **)converted_input_samples, frame_size) < frame_size) {
+        Error( "Could not write data to FIFO\n");
+        return 0;
+    }
 
       /** Create a new frame to store the audio samples. */
       if (!(output_frame = av_frame_alloc())) {
@@ -568,6 +613,9 @@ output_frame->channel_layout, output_frame->format , output_frame->sample_rate
         zm_av_unref_packet(&opkt);
         return 0;
       }
+    } else {
+  Debug(2, "Not data present" );
+    } // end if data_present
 }
   } else {
     opkt.data = ipkt->data;

src/zm_videostore.h

@@ -2,6 +2,7 @@
 #define ZM_VIDEOSTORE_H
 
 #include "zm_ffmpeg.h"
+#include "libavutil/audio_fifo.h"
 
 #if HAVE_LIBAVCODEC
 
@@ -19,6 +20,8 @@ private:
   AVCodec *audio_output_codec;
   AVCodecContext *audio_output_context;
   int data_present;
+  AVAudioFifo *fifo;
+  int output_frame_size;
     
 	const char *filename;
 	const char *format;