Changeset 2620 for pjproject/trunk/pjmedia/src/pjmedia-codec/g7221.c

Timestamp:

Apr 20, 2009 2:19:11 PM (15 years ago)

Author:

bennylp

Message:

More ticket #774: added option to shift PCM input to encoder right by some value (default is 1) to make it compatible with some other app

File:

• pjproject/trunk/pjmedia/src/pjmedia-codec/g7221.c (modified) (8 diffs)

pjproject/trunk/pjmedia/src/pjmedia-codec/g7221.c

@@ -138 +138 @@
     pj_mutex_t              *mutex;         /**< Codec factory mutex.       */
 
+    int                      pcm_shift;     /**< Level adjustment           */
     unsigned                 mode_count;    /**< Number of G722.1 modes.    */
     codec_mode               modes[MAX_CODEC_MODES]; /**< The G722.1 modes. */
@@ -165 +166 @@
     pj_uint16_t          frame_size_bits;   /**< Coded frame size in bits.  */
     pj_uint16_t          number_of_regions; /**< Number of regions.         */
+    int                  pcm_shift;         /**< Adjustment for PCM in/out  */
     
     /* Encoder specific state */
+    Word16              *enc_frame;         /**< 16bit to 14bit buffer      */
     Word16              *enc_old_frame;
     
@@ -252 +255 @@
     /* Initialize codec modes, by default all standard bitrates are enabled */
     codec_factory.mode_count = 0;
+    codec_factory.pcm_shift = PJMEDIA_G7221_DEFAULT_PCM_SHIFT;
 
     mode = &codec_factory.modes[codec_factory.mode_count++];
@@ -409 +413 @@
 
 /*
+ * Set level adjustment.
+ */
+PJ_DEF(pj_status_t)  pjmedia_codec_g7221_set_pcm_shift(int val)
+{
+    codec_factory.pcm_shift = val;
+    return PJ_SUCCESS;
+}
+
+/*
  * Unregister G722.1 codec factory from pjmedia endpoint.
  */
@@ -645 +658 @@
                                     (attr->info.clock_rate <= WB_SAMPLE_RATE?
                                      NUMBER_OF_REGIONS:MAX_NUMBER_OF_REGIONS);
+    codec_data->pcm_shift = codec_factory.pcm_shift;
 
     /* Initialize encoder state */
     tmp = codec_data->samples_per_frame << 1;
     codec_data->enc_old_frame = (Word16*)pj_pool_zalloc(pool, tmp);
+    codec_data->enc_frame = (Word16*)pj_pool_alloc(pool, tmp);
 
     /* Initialize decoder state */
@@ -734 +749 @@
 {
     codec_private_t *codec_data = (codec_private_t*) codec->codec_data;
+    const Word16 *pcm_input;
     Word16 mlt_coefs[MAX_SAMPLES_PER_FRAME];
     Word16 mag_shift;
@@ -773 +789 @@
     }
 
+    /* Encoder adjust the input signal level */
+    if (codec_data->pcm_shift) {
+        unsigned i;
+        pcm_input = (const Word16*)input->buf;
+        for (i=0; i<codec_data->samples_per_frame; ++i) {
+            codec_data->enc_frame[i] = 
+                (pj_int16_t)(pcm_input[i] >> codec_data->pcm_shift);
+        }
+        pcm_input = codec_data->enc_frame;
+    } else {
+        pcm_input = (const Word16*)input->buf;
+    }
+
     /* Convert input samples to rmlt coefs */
-    mag_shift = samples_to_rmlt_coefs((Word16*)input->buf,
+    mag_shift = samples_to_rmlt_coefs(pcm_input,
                                       codec_data->enc_old_frame, 
                                       mlt_coefs, 
@@ -856 +885 @@
                           mag_shift);
 
+    /* Decoder adjust PCM signal */
+    if (codec_data->pcm_shift) {
+        unsigned i;
+        pj_int16_t *buf = (Word16*)output->buf;
+
+        for (i=0; i<codec_data->samples_per_frame; ++i) {
+            buf[i] <<= codec_data->pcm_shift;
+        }
+    }
+
     output->type = PJMEDIA_FRAME_TYPE_AUDIO;
     output->size = codec_data->samples_per_frame << 1;