From 0f557857dd5245dc11375609a69fa8d128f6b324 Mon Sep 17 00:00:00 2001 From: Gwenole Beauchesne Date: Wed, 10 Oct 2012 09:45:03 +0200 Subject: [PATCH] mpeg2: add decode_packet() helper function. Split decode_buffer() into the core infrastructure that determines the packets contained in the adapter and the actual function that decodes the packet data. --- gst-libs/gst/vaapi/gstvaapidecoder_mpeg2.c | 163 +++++++++++++++-------------- 1 file changed, 87 insertions(+), 76 deletions(-) diff --git a/gst-libs/gst/vaapi/gstvaapidecoder_mpeg2.c b/gst-libs/gst/vaapi/gstvaapidecoder_mpeg2.c index a4544c6..928c64f 100644 --- a/gst-libs/gst/vaapi/gstvaapidecoder_mpeg2.c +++ b/gst-libs/gst/vaapi/gstvaapidecoder_mpeg2.c @@ -946,6 +946,92 @@ scan_for_start_code(GstAdapter *adapter, guint ofs, guint size, guint32 *scp) } static GstVaapiDecoderStatus +decode_packet(GstVaapiDecoderMpeg2 *decoder, guchar *buf, guint buf_size) +{ + GstVaapiDecoderMpeg2Private * const priv = decoder->priv; + GstVaapiDecoderStatus status; + guchar type; + + /* The packet defined by buf and buf_size contains the start code */ + type = buf[3]; + switch (type) { + case GST_MPEG_VIDEO_PACKET_PICTURE: + if (!priv->width || !priv->height) + goto unknown_picture_size; + status = decode_picture(decoder, buf, buf_size); + break; + case GST_MPEG_VIDEO_PACKET_SEQUENCE: + status = decode_sequence(decoder, buf, buf_size); + break; + case GST_MPEG_VIDEO_PACKET_EXTENSION: { + const guchar id = buf[4] >> 4; + switch (id) { + case GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE: + status = decode_sequence_ext(decoder, buf, buf_size); + break; + case GST_MPEG_VIDEO_PACKET_EXT_QUANT_MATRIX: + status = decode_quant_matrix_ext(decoder, buf, buf_size); + break; + case GST_MPEG_VIDEO_PACKET_EXT_PICTURE: + if (!priv->width || !priv->height) + goto unknown_picture_size; + status = decode_picture_ext(decoder, buf, buf_size); + break; + default: + // Ignore unknown start-code extensions + GST_WARNING("unsupported start code extension (0x%02x)", id); + status = GST_VAAPI_DECODER_STATUS_SUCCESS; + break; + } + break; + } + case GST_MPEG_VIDEO_PACKET_SEQUENCE_END: + status = decode_sequence_end(decoder); + break; + case GST_MPEG_VIDEO_PACKET_GOP: + status = decode_gop(decoder, buf, buf_size); + break; + case GST_MPEG_VIDEO_PACKET_USER_DATA: + // Ignore user-data packets + status = GST_VAAPI_DECODER_STATUS_SUCCESS; + break; + default: + if (type >= GST_MPEG_VIDEO_PACKET_SLICE_MIN && + type <= GST_MPEG_VIDEO_PACKET_SLICE_MAX) { + if (!priv->current_picture) + goto undefined_picture; + status = decode_slice( + decoder, + type - GST_MPEG_VIDEO_PACKET_SLICE_MIN, + buf, buf_size + ); + break; + } + else if (type >= 0xb9 && type <= 0xff) { + // Ignore system start codes (PES headers) + status = GST_VAAPI_DECODER_STATUS_SUCCESS; + break; + } + GST_WARNING("unsupported start code (0x%02x)", type); + status = GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER; + break; + } + return status; + +unknown_picture_size: + // Ignore packet while picture size is undefined + // i.e. missing sequence headers, or not parsed correctly + GST_WARNING("failed to parse picture of unknown size"); + return GST_VAAPI_DECODER_STATUS_SUCCESS; + +undefined_picture: + // Ignore packet while picture is undefined + // i.e. missing picture headers, or not parsed correctly + GST_WARNING("failed to parse slice with undefined picture"); + return GST_VAAPI_DECODER_STATUS_SUCCESS; +} + +static GstVaapiDecoderStatus decode_buffer(GstVaapiDecoderMpeg2 *decoder, GstBuffer *buffer) { GstVaapiDecoderMpeg2Private * const priv = decoder->priv; @@ -954,7 +1040,6 @@ decode_buffer(GstVaapiDecoderMpeg2 *decoder, GstBuffer *buffer) guchar *buf; guint buf_size, size; guint32 start_code; - guint8 type; gint ofs; buf = GST_BUFFER_DATA(buffer); @@ -998,82 +1083,8 @@ decode_buffer(GstVaapiDecoderMpeg2 *decoder, GstBuffer *buffer) buf = GST_BUFFER_DATA(buffer); buf_size = GST_BUFFER_SIZE(buffer); + status = decode_packet(decoder, buf, buf_size); - type = start_code & 0xff; - switch (type) { - case GST_MPEG_VIDEO_PACKET_PICTURE: - if (priv->width > 0 && priv->height > 0) { - status = decode_picture(decoder, buf, buf_size); - break; - } - - // Ignore packet while picture size is undefined - // i.e. missing sequence headers, or not parsed correctly - skip_picture_unknown_size: - GST_WARNING("failed to parse picture of unknown size"); - status = GST_VAAPI_DECODER_STATUS_SUCCESS; - break; - case GST_MPEG_VIDEO_PACKET_SEQUENCE: - status = decode_sequence(decoder, buf, buf_size); - break; - case GST_MPEG_VIDEO_PACKET_EXTENSION: { - const guchar id = buf[4] >> 4; - switch (id) { - case GST_MPEG_VIDEO_PACKET_EXT_SEQUENCE: - status = decode_sequence_ext(decoder, buf, buf_size); - break; - case GST_MPEG_VIDEO_PACKET_EXT_QUANT_MATRIX: - status = decode_quant_matrix_ext(decoder, buf, buf_size); - break; - case GST_MPEG_VIDEO_PACKET_EXT_PICTURE: - if (priv->width > 0 && priv->height > 0) { - status = decode_picture_ext(decoder, buf, buf_size); - break; - } - goto skip_picture_unknown_size; - default: - // Ignore unknown extensions - GST_WARNING("unsupported start-code extension (0x%02x)", id); - status = GST_VAAPI_DECODER_STATUS_SUCCESS; - break; - } - break; - } - case GST_MPEG_VIDEO_PACKET_SEQUENCE_END: - status = decode_sequence_end(decoder); - break; - case GST_MPEG_VIDEO_PACKET_GOP: - status = decode_gop(decoder, buf, buf_size); - break; - case GST_MPEG_VIDEO_PACKET_USER_DATA: - // Ignore user-data packets - status = GST_VAAPI_DECODER_STATUS_SUCCESS; - break; - default: - if (type >= GST_MPEG_VIDEO_PACKET_SLICE_MIN && - type <= GST_MPEG_VIDEO_PACKET_SLICE_MAX) { - if (!priv->current_picture) { - // Ignore packet while picture is undefined - // i.e. missing picture headers, or not parsed correctly - status = GST_VAAPI_DECODER_STATUS_SUCCESS; - break; - } - status = decode_slice( - decoder, - type - GST_MPEG_VIDEO_PACKET_SLICE_MIN, - buf, buf_size - ); - break; - } - else if (type >= 0xb9 && type <= 0xff) { - // Ignore system start codes (PES headers) - status = GST_VAAPI_DECODER_STATUS_SUCCESS; - break; - } - GST_WARNING("unsupported start code (0x%02x)", type); - status = GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER; - break; - } gst_buffer_unref(buffer); } while (status == GST_VAAPI_DECODER_STATUS_SUCCESS); -- 2.7.4