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vc1parse: add some asf related stream-format conversions

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This commit introduces an helper to convert an ASF frame to BDUs format with
startcodes and use this helper to implements following stream-format
conversions:
- asf --> bdu
- asf --> sequence-layer-bdu
- asf --> sequence-layer-raw-frame

https://bugzilla.gnome.org/show_bug.cgi?id=738526
This commit is contained in:
Aurélien Zanelli 2014-09-30 15:35:38 +02:00 committed by Sebastian Dröge
parent f2c5900c6d
commit 5eadb05fab
1 changed files with 94 additions and 0 deletions
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94
gst/videoparsers/gstvc1parse.c
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@ -1394,6 +1394,63 @@ gst_vc1_parse_push_sequence_layer (GstVC1Parse * vc1parse)
return gst_pad_push (GST_BASE_PARSE_SRC_PAD (vc1parse), seq_layer);
}
static GstFlowReturn
gst_vc1_parse_convert_asf_to_bdu (GstVC1Parse * vc1parse,
GstBaseParseFrame * frame)
{
GstByteWriter bw;
GstBuffer *buffer;
GstBuffer *tmp;
GstMemory *mem;
guint8 sc_data[4];
guint32 startcode;
gboolean ok;
GstFlowReturn ret = GST_FLOW_OK;
buffer = frame->buffer;
/* Simple profile doesn't have start codes so bdu format is not possible */
if (vc1parse->profile == GST_VC1_PROFILE_SIMPLE) {
GST_ERROR_OBJECT (vc1parse, "can't convert to bdu in simple profile");
ret = GST_FLOW_NOT_NEGOTIATED;
goto done;
}
/* ASF frame could have a start code at the beginning or not. So we first
* check for a start code if we have at least 4 bytes in the buffer. */
if (gst_buffer_extract (buffer, 0, sc_data, 4) == 4) {
startcode = GST_READ_UINT32_BE (sc_data);
if (((startcode & 0xffffff00) == 0x00000100)) {
/* Start code found */
goto done;
}
}
/* Yes, a frame could be smaller than 4 bytes and valid, for instance
* black video. */
/* We will prepend 4 bytes to buffer */
gst_byte_writer_init_with_size (&bw, 4, TRUE);
/* Set start code and suffixe, we assume raw asf data is a frame */
ok = gst_byte_writer_put_uint24_be (&bw, 0x000001);
ok &= gst_byte_writer_put_uint8 (&bw, 0x0D);
tmp = gst_byte_writer_reset_and_get_buffer (&bw);
/* Prepend startcode buffer to frame buffer */
mem = gst_buffer_get_all_memory (tmp);
gst_buffer_prepend_memory (buffer, mem);
gst_buffer_unref (tmp);
if (G_UNLIKELY (!ok)) {
GST_ERROR_OBJECT (vc1parse, "convert asf to bdu failed");
ret = GST_FLOW_ERROR;
}
done:
return ret;
}
static GstFlowReturn
gst_vc1_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
@ -1441,7 +1498,11 @@ gst_vc1_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
case VC1_STREAM_FORMAT_SEQUENCE_LAYER_BDU_FRAME:
case VC1_STREAM_FORMAT_SEQUENCE_LAYER_RAW_FRAME:
case VC1_STREAM_FORMAT_SEQUENCE_LAYER_FRAME_LAYER:
goto conversion_not_supported;
break;
case VC1_STREAM_FORMAT_ASF:
ret = gst_vc1_parse_convert_asf_to_bdu (vc1parse, frame);
break;
case VC1_STREAM_FORMAT_FRAME_LAYER:
goto conversion_not_supported;
break;
@ -1502,7 +1563,22 @@ gst_vc1_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
case VC1_STREAM_FORMAT_SEQUENCE_LAYER_BDU_FRAME:
case VC1_STREAM_FORMAT_SEQUENCE_LAYER_RAW_FRAME:
case VC1_STREAM_FORMAT_SEQUENCE_LAYER_FRAME_LAYER:
goto conversion_not_supported;
break;
case VC1_STREAM_FORMAT_ASF:
/* We just need to send the sequence-layer first */
if (!vc1parse->seq_layer_sent) {
ret = gst_vc1_parse_push_sequence_layer (vc1parse);
if (ret != GST_FLOW_OK) {
GST_ERROR_OBJECT (vc1parse, "push sequence layer failed");
break;
}
vc1parse->seq_layer_sent = TRUE;
}
/* FIXME: We may only authorize this when header-format is set to
* none and we should add the entrypoint for advanced profile. */
ret = gst_vc1_parse_convert_asf_to_bdu (vc1parse, frame);
break;
case VC1_STREAM_FORMAT_FRAME_LAYER:
goto conversion_not_supported;
break;
@ -1547,6 +1623,12 @@ gst_vc1_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
break;
case VC1_STREAM_FORMAT_SEQUENCE_LAYER_RAW_FRAME:
if (vc1parse->profile != GST_VC1_PROFILE_SIMPLE &&
vc1parse->profile != GST_VC1_PROFILE_MAIN) {
GST_ERROR_OBJECT (vc1parse,
"sequence-layer-raw-frame is only for simple/main profile");
goto conversion_not_supported;
}
switch (vc1parse->input_stream_format) {
case VC1_STREAM_FORMAT_BDU:
case VC1_STREAM_FORMAT_BDU_FRAME:
@ -1558,7 +1640,19 @@ gst_vc1_parse_pre_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
g_assert_not_reached ();
break;
case VC1_STREAM_FORMAT_SEQUENCE_LAYER_FRAME_LAYER:
goto conversion_not_supported;
case VC1_STREAM_FORMAT_ASF:
/* ASF contains raw frame for simple/main profile, so we just
* have to send sequence-layer before frames */
if (!vc1parse->seq_layer_sent) {
ret = gst_vc1_parse_push_sequence_layer (vc1parse);
if (ret != GST_FLOW_OK) {
GST_ERROR_OBJECT (vc1parse, "push sequence layer failed");
break;
}
vc1parse->seq_layer_sent = TRUE;
}
break;
case VC1_STREAM_FORMAT_FRAME_LAYER:
goto conversion_not_supported;
break;