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gstreamer/sys/vdpau/mpegutil.c
Carl-Anton Ingmarsson d65d4c40f5 vdpaumpegdec: small cleanups
2009-06-20 15:21:45 +01:00

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/* GStreamer
* Copyright (C) 2007 Jan Schmidt <thaytan@mad.scientist.com>
* Copyright (C) 2009 Carl-Anton Ingmarsson <ca.ingmarsson@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <gst/base/gstbitreader.h>
#include <string.h>
#include "mpegutil.h"
/* default intra quant matrix, in zig-zag order */
static const guint8 default_intra_quantizer_matrix[64] = {
8,
16, 16,
19, 16, 19,
22, 22, 22, 22,
22, 22, 26, 24, 26,
27, 27, 27, 26, 26, 26,
26, 27, 27, 27, 29, 29, 29,
34, 34, 34, 29, 29, 29, 27, 27,
29, 29, 32, 32, 34, 34, 37,
38, 37, 35, 35, 34, 35,
38, 38, 40, 40, 40,
48, 48, 46, 46,
56, 56, 58,
69, 69,
83
};
guint8 mpeg2_scan[64] = {
/* Zig-Zag scan pattern */
0, 1, 8, 16, 9, 2, 3, 10,
17, 24, 32, 25, 18, 11, 4, 5,
12, 19, 26, 33, 40, 48, 41, 34,
27, 20, 13, 6, 7, 14, 21, 28,
35, 42, 49, 56, 57, 50, 43, 36,
29, 22, 15, 23, 30, 37, 44, 51,
58, 59, 52, 45, 38, 31, 39, 46,
53, 60, 61, 54, 47, 55, 62, 63
};
static void
set_fps_from_code (MPEGSeqHdr * hdr, guint8 fps_code)
{
const gint framerates[][2] = {
{30, 1}, {24000, 1001}, {24, 1}, {25, 1},
{30000, 1001}, {30, 1}, {50, 1}, {60000, 1001},
{60, 1}, {30, 1}
};
if (fps_code < 10) {
hdr->fps_n = framerates[fps_code][0];
hdr->fps_d = framerates[fps_code][1];
} else {
/* Force a valid framerate */
hdr->fps_n = 30000;
hdr->fps_d = 1001;
}
}
/* Set the Pixel Aspect Ratio in our hdr from a DAR code in the data */
static void
set_par_from_dar (MPEGSeqHdr * hdr, guint8 asr_code)
{
/* Pixel_width = DAR_width * display_vertical_size */
/* Pixel_height = DAR_height * display_horizontal_size */
switch (asr_code) {
case 0x02: /* 3:4 DAR = 4:3 pixels */
hdr->par_w = 4 * hdr->height;
hdr->par_h = 3 * hdr->width;
break;
case 0x03: /* 9:16 DAR */
hdr->par_w = 16 * hdr->height;
hdr->par_h = 9 * hdr->width;
break;
case 0x04: /* 1:2.21 DAR */
hdr->par_w = 221 * hdr->height;
hdr->par_h = 100 * hdr->width;
break;
case 0x01: /* Square pixels */
default:
hdr->par_w = hdr->par_h = 1;
break;
}
}
gboolean
mpeg_util_parse_sequence_extension (MPEGSeqExtHdr * hdr, GstBuffer * buffer)
{
GstBitReader reader = GST_BIT_READER_INIT_FROM_BUFFER (buffer);;
/* skip sync word */
if (!gst_bit_reader_skip (&reader, 8 * 4))
return FALSE;
/* skip extension code */
if (!gst_bit_reader_skip (&reader, 4))
return FALSE;
/* skip profile and level escape bit */
if (!gst_bit_reader_skip (&reader, 1))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &hdr->profile, 3))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &hdr->level, 4))
return FALSE;
/* progressive */
if (!gst_bit_reader_get_bits_uint8 (&reader, &hdr->progressive, 1))
return FALSE;
/* chroma format */
if (!gst_bit_reader_get_bits_uint8 (&reader, &hdr->chroma_format, 2))
return FALSE;
/* resolution extension */
if (!gst_bit_reader_get_bits_uint8 (&reader, &hdr->horiz_size_ext, 2))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &hdr->vert_size_ext, 2))
return FALSE;
if (!gst_bit_reader_get_bits_uint16 (&reader, &hdr->bitrate_ext, 12))
return FALSE;
/* skip to framerate extension */
if (!gst_bit_reader_skip (&reader, 9))
return FALSE;
/* framerate extension */
if (!gst_bit_reader_get_bits_uint8 (&reader, &hdr->fps_n_ext, 2))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &hdr->fps_d_ext, 2))
return FALSE;
return TRUE;
}
gboolean
mpeg_util_parse_sequence_hdr (MPEGSeqHdr * hdr, GstBuffer * buffer)
{
GstBitReader reader = GST_BIT_READER_INIT_FROM_BUFFER (buffer);
guint8 dar_idx, par_idx;
guint8 load_intra_flag, load_non_intra_flag;
/* skip sync word */
if (!gst_bit_reader_skip (&reader, 8 * 4))
return FALSE;
/* resolution */
if (!gst_bit_reader_get_bits_uint16 (&reader, &hdr->width, 12))
return FALSE;
if (!gst_bit_reader_get_bits_uint16 (&reader, &hdr->height, 12))
return FALSE;
/* aspect ratio */
if (!gst_bit_reader_get_bits_uint8 (&reader, &dar_idx, 4))
return FALSE;
set_par_from_dar (hdr, dar_idx);
/* framerate */
if (!gst_bit_reader_get_bits_uint8 (&reader, &par_idx, 4))
return FALSE;
set_fps_from_code (hdr, par_idx);
/* bitrate */
if (!gst_bit_reader_get_bits_uint32 (&reader, &hdr->bitrate, 18))
return FALSE;
if (!gst_bit_reader_skip (&reader, 1))
return FALSE;
/* VBV buffer size */
if (!gst_bit_reader_get_bits_uint16 (&reader, &hdr->vbv_buffer, 10))
return FALSE;
/* constrained parameters flag */
if (!gst_bit_reader_get_bits_uint8 (&reader,
&hdr->constrained_parameters_flag, 1))
return FALSE;
/* intra quantizer matrix */
if (!gst_bit_reader_get_bits_uint8 (&reader, &load_intra_flag, 1))
return FALSE;
if (load_intra_flag) {
gint i;
for (i = 0; i < 64; i++) {
if (!gst_bit_reader_get_bits_uint8 (&reader,
&hdr->intra_quantizer_matrix[mpeg2_scan[i]], 8))
return FALSE;
}
} else
memcpy (hdr->intra_quantizer_matrix, default_intra_quantizer_matrix, 64);
/* non intra quantizer matrix */
if (!gst_bit_reader_get_bits_uint8 (&reader, &load_non_intra_flag, 1))
return FALSE;
if (load_non_intra_flag) {
gint i;
for (i = 0; i < 64; i++) {
if (!gst_bit_reader_get_bits_uint8 (&reader,
&hdr->non_intra_quantizer_matrix[mpeg2_scan[i]], 8))
return FALSE;
}
} else
memset (hdr->non_intra_quantizer_matrix, 16, 64);
return TRUE;
}
gboolean
mpeg_util_parse_picture_hdr (MPEGPictureHdr * hdr, GstBuffer * buffer)
{
GstBitReader reader = GST_BIT_READER_INIT_FROM_BUFFER (buffer);
/* skip sync word */
if (!gst_bit_reader_skip (&reader, 8 * 4))
return FALSE;
/* temperal sequence number */
if (!gst_bit_reader_get_bits_uint16 (&reader, &hdr->tsn, 10))
return FALSE;
/* frame type */
if (!gst_bit_reader_get_bits_uint8 (&reader, &hdr->pic_type, 3))
return FALSE;
if (hdr->pic_type == 0 || hdr->pic_type > 4)
return FALSE; /* Corrupted picture packet */
/* VBV delay */
if (!gst_bit_reader_get_bits_uint16 (&reader, &hdr->vbv_delay, 16))
return FALSE;
if (hdr->pic_type == P_FRAME || hdr->pic_type == B_FRAME) {
if (!gst_bit_reader_get_bits_uint8 (&reader, &hdr->full_pel_forward_vector,
1))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &hdr->f_code[0][0], 3))
return FALSE;
hdr->f_code[0][1] = hdr->f_code[0][0];
} else {
hdr->full_pel_forward_vector = 0;
hdr->f_code[0][0] = hdr->f_code[0][1] = 0;
}
if (hdr->pic_type == B_FRAME) {
if (!gst_bit_reader_get_bits_uint8 (&reader,
&hdr->full_pel_backward_vector, 1))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &hdr->f_code[1][0], 3))
return FALSE;
hdr->f_code[1][1] = hdr->f_code[1][0];
} else {
hdr->full_pel_backward_vector = 0;
hdr->f_code[1][0] = hdr->f_code[1][1] = 0;
}
return TRUE;
}
gboolean
mpeg_util_parse_picture_coding_extension (MPEGPictureExt * ext,
GstBuffer * buffer)
{
GstBitReader reader = GST_BIT_READER_INIT_FROM_BUFFER (buffer);
/* skip sync word */
if (!gst_bit_reader_skip (&reader, 8 * 4))
return FALSE;
/* skip extension code */
if (!gst_bit_reader_skip (&reader, 4))
return FALSE;
/* f_code */
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->f_code[0][0], 4))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->f_code[0][1], 4))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->f_code[1][0], 4))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->f_code[1][1], 4))
return FALSE;
/* intra DC precision */
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->intra_dc_precision, 2))
return FALSE;
/* picture structure */
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->picture_structure, 2))
return FALSE;
/* top field first */
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->top_field_first, 1))
return FALSE;
/* frame pred frame dct */
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->frame_pred_frame_dct, 1))
return FALSE;
/* concealment motion vectors */
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->concealment_motion_vectors,
1))
return FALSE;
/* q scale type */
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->q_scale_type, 1))
return FALSE;
/* intra vlc format */
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->intra_vlc_format, 1))
return FALSE;
/* alternate scan */
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->alternate_scan, 1))
return FALSE;
/* repeat first field */
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->repeat_first_field, 1))
return FALSE;
/* chroma_420_type */
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->chroma_420_type, 1))
return FALSE;
/* progressive_frame */
if (!gst_bit_reader_get_bits_uint8 (&reader, &ext->progressive_frame, 1))
return FALSE;
return TRUE;
}
gboolean
mpeg_util_parse_gop (MPEGGop * gop, GstBuffer * buffer)
{
GstBitReader reader = GST_BIT_READER_INIT_FROM_BUFFER (buffer);
/* skip sync word */
if (!gst_bit_reader_skip (&reader, 8 * 4))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &gop->drop_frame_flag, 1))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &gop->hour, 5))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &gop->minute, 6))
return FALSE;
/* skip unused bit */
if (!gst_bit_reader_skip (&reader, 1))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &gop->second, 6))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &gop->frame, 6))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &gop->closed_gop, 1))
return FALSE;
if (!gst_bit_reader_get_bits_uint8 (&reader, &gop->broken_gop, 1))
return FALSE;
return TRUE;
}
gboolean
mpeg_util_parse_quant_matrix (MPEGQuantMatrix * qm, GstBuffer * buffer)
{
GstBitReader reader = GST_BIT_READER_INIT_FROM_BUFFER (buffer);
guint8 load_intra_flag, load_non_intra_flag;
/* skip sync word */
if (!gst_bit_reader_skip (&reader, 8 * 4))
return FALSE;
/* skip extension code */
if (!gst_bit_reader_skip (&reader, 4))
return FALSE;
/* intra quantizer matrix */
if (!gst_bit_reader_get_bits_uint8 (&reader, &load_intra_flag, 1))
return FALSE;
if (load_intra_flag) {
gint i;
for (i = 0; i < 64; i++) {
if (!gst_bit_reader_get_bits_uint8 (&reader,
&qm->intra_quantizer_matrix[mpeg2_scan[i]], 8))
return FALSE;
}
} else
memcpy (qm->intra_quantizer_matrix, default_intra_quantizer_matrix, 64);
/* non intra quantizer matrix */
if (!gst_bit_reader_get_bits_uint8 (&reader, &load_non_intra_flag, 1))
return FALSE;
if (load_non_intra_flag) {
gint i;
for (i = 0; i < 64; i++) {
if (!gst_bit_reader_get_bits_uint8 (&reader,
&qm->non_intra_quantizer_matrix[mpeg2_scan[i]], 8))
return FALSE;
}
} else
memset (qm->non_intra_quantizer_matrix, 16, 64);
return TRUE;
}
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