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decoder: optimize and clean decode_step() up.

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Avoid usage of goto. Simplify decode_step() process to first accumulate all
pending buffers into the GstAdapter, and then parse and decode units from
that input adapter. Stop the process once a frame is fully decoded or an
error occurred.
This commit is contained in:
Gwenole Beauchesne 2013-01-18 16:56:15 +01:00
parent cd52fa315a
commit a811a5de3d
1 changed files with 50 additions and 45 deletions
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95
gst-libs/gst/vaapi/gstvaapidecoder.c
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@ -275,67 +275,72 @@ decode_step(GstVaapiDecoder *decoder)
GstVaapiDecoderStatus status;
GstBuffer *buffer;
gboolean got_frame;
guint got_unit_size;
if (G_UNLIKELY(ps->at_eos))
return GST_VAAPI_DECODER_STATUS_END_OF_STREAM;
guint got_unit_size, input_size;
status = gst_vaapi_decoder_check_status(decoder);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
if (ps->current_frame)
goto parse;
do {
/* Fill adapter with all buffers we have in the queue */
for (;;) {
buffer = pop_buffer(decoder);
if (!buffer)
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
break;
ps->at_eos = GST_BUFFER_IS_EOS(buffer);
if (!ps->at_eos)
gst_adapter_push(ps->input_adapter, buffer);
}
do {
if (!ps->current_frame) {
ps->current_frame = g_slice_new0(GstVideoCodecFrame);
if (!ps->current_frame)
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
ps->current_frame->ref_count = 1;
/* Parse and decode all decode units */
input_size = gst_adapter_available(ps->input_adapter);
if (input_size == 0) {
if (ps->at_eos)
return GST_VAAPI_DECODER_STATUS_END_OF_STREAM;
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
}
do {
if (!ps->current_frame) {
ps->current_frame = g_slice_new0(GstVideoCodecFrame);
if (!ps->current_frame)
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
ps->current_frame->ref_count = 1;
}
status = do_parse(decoder, ps->current_frame, ps->input_adapter,
ps->at_eos, &got_unit_size, &got_frame);
GST_DEBUG("parse frame (status = %d)", status);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS) {
if (status == GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA && ps->at_eos)
status = GST_VAAPI_DECODER_STATUS_END_OF_STREAM;
break;
}
if (got_unit_size > 0) {
buffer = gst_adapter_take_buffer(ps->input_adapter, got_unit_size);
input_size -= got_unit_size;
if (gst_adapter_available(ps->output_adapter) == 0) {
ps->current_frame->pts =
gst_adapter_prev_timestamp(ps->input_adapter, NULL);
}
gst_adapter_push(ps->output_adapter, buffer);
}
parse:
status = do_parse(decoder, ps->current_frame,
ps->input_adapter, ps->at_eos, &got_unit_size, &got_frame);
GST_DEBUG("parse frame (status = %d)", status);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
break;
if (got_frame) {
ps->current_frame->input_buffer = gst_adapter_take_buffer(
ps->output_adapter,
gst_adapter_available(ps->output_adapter));
if (got_unit_size > 0) {
buffer = gst_adapter_take_buffer(ps->input_adapter,
got_unit_size);
if (gst_adapter_available(ps->output_adapter) == 0) {
ps->current_frame->pts =
gst_adapter_prev_timestamp(ps->input_adapter, NULL);
}
gst_adapter_push(ps->output_adapter, buffer);
}
status = do_decode(decoder, ps->current_frame);
GST_DEBUG("decode frame (status = %d)", status);
if (got_frame) {
ps->current_frame->input_buffer = gst_adapter_take_buffer(
ps->output_adapter,
gst_adapter_available(ps->output_adapter));
status = do_decode(decoder, ps->current_frame);
GST_DEBUG("decode frame (status = %d)", status);
gst_video_codec_frame_unref(ps->current_frame);
ps->current_frame = NULL;
break;
}
} while (status == GST_VAAPI_DECODER_STATUS_SUCCESS &&
gst_adapter_available(ps->input_adapter) > 0);
} while (status == GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA);
gst_video_codec_frame_unref(ps->current_frame);
ps->current_frame = NULL;
break;
}
} while (input_size > 0);
return status;
}