static GstFlowReturn
gst_mulawdec_handle_frame (GstAudioDecoder * dec, GstBuffer * buffer)
{
GstMapInfo inmap, outmap;
gint16 *linear_data;
guint8 *mulaw_data;
gsize mulaw_size, linear_size;
GstBuffer *outbuf;
if (!buffer) {
return GST_FLOW_OK;
}
if (!gst_buffer_map (buffer, &inmap, GST_MAP_READ)) {
GST_ERROR ("failed to map input buffer");
goto error_failed_map_input_buffer;
}
mulaw_data = inmap.data;
mulaw_size = inmap.size;
linear_size = mulaw_size * 2;
outbuf = gst_audio_decoder_allocate_output_buffer (dec, linear_size);
if (!gst_buffer_map (outbuf, &outmap, GST_MAP_WRITE)) {
GST_ERROR ("failed to map input buffer");
goto error_failed_map_output_buffer;
}
linear_data = (gint16 *) outmap.data;
mulaw_decode (mulaw_data, linear_data, mulaw_size);
gst_buffer_unmap (outbuf, &outmap);
gst_buffer_unmap (buffer, &inmap);
return gst_audio_decoder_finish_frame (dec, outbuf, -1);
error_failed_map_output_buffer:
gst_buffer_unref (outbuf);
error_failed_map_input_buffer:
return GST_FLOW_ERROR;
}
static int convert_mulaw_pcm_sample_rate(char* out_buf, int out_buf_size, char* in_buf, int in_buf_size, int in_sr, int out_sr, int num_of_channels, int sample_size, int num_of_in_samples){
int result = 0;
int i,j,k;
if (sample_size == 8){
unsigned char* ip = (unsigned char*) in_buf;
short* op = (short*)out_buf;
int multiplier = out_sr / in_sr;
int iss = num_of_channels;
int oss = num_of_channels * multiplier;
int ocs = num_of_channels;
for(i = 0; i < num_of_in_samples; ++i){
for(k = 0; k < multiplier; ++k){
for(j = 0; j < num_of_channels; ++j){
op[i * oss + k * ocs + j] = mulaw_decode(ip[i * iss + j]);
}
}
}
if (((num_of_in_samples * multiplier) % MPEG_LAYER_2_PACKET_SIZE) == 0)
result = ((num_of_in_samples * multiplier) / MPEG_LAYER_2_PACKET_SIZE ) ;
else
result = ((num_of_in_samples * multiplier) / MPEG_LAYER_2_PACKET_SIZE + 1) * MPEG_LAYER_2_PACKET_SIZE;
}
return result;
}
static GstFlowReturn
gst_mulawdec_chain (GstPad * pad, GstBuffer * buffer)
{
GstMuLawDec *mulawdec;
gint16 *linear_data;
guint8 *mulaw_data;
guint mulaw_size;
GstBuffer *outbuf;
GstFlowReturn ret;
mulawdec = GST_MULAWDEC (GST_PAD_PARENT (pad));
if (G_UNLIKELY (mulawdec->rate == 0))
goto not_negotiated;
mulaw_data = (guint8 *) GST_BUFFER_DATA (buffer);
mulaw_size = GST_BUFFER_SIZE (buffer);
ret =
gst_pad_alloc_buffer_and_set_caps (mulawdec->srcpad,
GST_BUFFER_OFFSET_NONE, mulaw_size * 2, GST_PAD_CAPS (mulawdec->srcpad),
&outbuf);
if (ret != GST_FLOW_OK)
goto alloc_failed;
linear_data = (gint16 *) GST_BUFFER_DATA (outbuf);
/* copy discont flag */
if (GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DISCONT))
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DISCONT);
GST_BUFFER_TIMESTAMP (outbuf) = GST_BUFFER_TIMESTAMP (buffer);
if (GST_BUFFER_DURATION (outbuf) == GST_CLOCK_TIME_NONE)
GST_BUFFER_DURATION (outbuf) = gst_util_uint64_scale_int (GST_SECOND,
mulaw_size * 2, 2 * mulawdec->rate * mulawdec->channels);
else
GST_BUFFER_DURATION (outbuf) = GST_BUFFER_DURATION (buffer);
gst_buffer_set_caps (outbuf, GST_PAD_CAPS (mulawdec->srcpad));
mulaw_decode (mulaw_data, linear_data, mulaw_size);
gst_buffer_unref (buffer);
ret = gst_pad_push (mulawdec->srcpad, outbuf);
return ret;
/* ERRORS */
not_negotiated:
{
GST_WARNING_OBJECT (mulawdec, "no input format set: not-negotiated");
gst_buffer_unref (buffer);
return GST_FLOW_NOT_NEGOTIATED;
}
alloc_failed:
{
GST_DEBUG_OBJECT (mulawdec, "pad alloc failed, flow: %s",
gst_flow_get_name (ret));
gst_buffer_unref (buffer);
return ret;
}
}
