mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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vdpau: extract mpeg2 profile from codec_data
This commit is contained in:
Carl-Anton Ingmarsson
Jan Schmidt
parent
090638ccec
commit
29d0c5bdd8
6 changed files with 325 additions and 12 deletions
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@ -1,8 +1,9 @@
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plugin_LTLIBRARIES = libgstvdpau.la
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libgstvdpau_la_SOURCES = \
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gstvdpaudecoder.c\
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gstvdpaumpegdecoder.c
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gstvdpaudecoder.c \
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gstvdpaumpegdecoder.c \
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mpegutil.c
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libgstvdpau_la_CFLAGS = $(GST_CFLAGS) $(X11_CFLAGS) -Ivdpau
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libgstvdpau_la_LIBADD = $(GST_LIBS) $(X11_LIBS) -lvdpau
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@ -10,8 +11,9 @@ libgstvdpau_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
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libgstvdpau_la_LIBTOOLFLAGS = --tag=disable-static
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noinst_HEADERS = \
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gstvdpaudecoder.h\
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gstvdpaudecoder.h \
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vdpauvariables.h \
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gstvdpaumpegdecoder.h
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gstvdpaumpegdecoder.h \
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mpegutil.h
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@ -302,6 +302,8 @@ gst_vdpaudecoder_sink_set_caps (GstPad * pad, GstCaps * caps)
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&framerate_numerator, &framerate_denominator);
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src_caps = gst_pad_get_allowed_caps (dec->src);
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if (G_UNLIKELY (!src_caps))
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return FALSE;
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structure = gst_caps_get_structure (src_caps, 0);
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gst_structure_get_fourcc (structure, "format", &fourcc_format);
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@ -318,7 +320,7 @@ gst_vdpaudecoder_sink_set_caps (GstPad * pad, GstCaps * caps)
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gst_caps_unref (new_caps);
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if (!res)
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if (G_UNLIKELY (!res))
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return FALSE;
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dec->width = width;
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@ -1,7 +1,5 @@
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/*
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* GStreamer
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* Copyright (C) 2005 Thomas Vander Stichele <thomas@apestaart.org>
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* Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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* Copyright (C) 2009 Carl-Anton Ingmarsson <ca.ingmarsson@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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@ -62,6 +60,7 @@
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#include <gst/gst.h>
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#include "mpegutil.h"
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#include "gstvdpaumpegdecoder.h"
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GST_DEBUG_CATEGORY_STATIC (gst_vdpau_mpeg_decoder_debug);
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@ -88,7 +87,7 @@ static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("video/mpeg, mpegversion = (int) [ 1, 2 ], "
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"systemstream = (boolean) false")
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"systemstream = (boolean) false, parsed = (boolean) true")
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);
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GST_BOILERPLATE (GstVdpauMpegDecoder, gst_vdpau_mpeg_decoder, GstVdpauDecoder,
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@ -104,11 +103,33 @@ gst_vdpau_mpeg_decoder_set_caps (GstVdpauDecoder * dec, GstCaps * caps)
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{
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GstVdpauMpegDecoder *mpeg_dec;
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GstStructure *structure;
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gint version;
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mpeg_dec = GST_VDPAU_MPEG_DECODER (dec);
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structure = gst_caps_get_structure (caps, 0);
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gst_structure_get_int (structure, "mpegversion", &mpeg_dec->version);
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gst_structure_get_int (structure, "mpegversion", &version);
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if (version == 1)
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mpeg_dec->profile = VDP_DECODER_PROFILE_MPEG1;
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else {
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const GValue *value;
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GstBuffer *codec_data;
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MPEGSeqHdr hdr = { 0, };
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value = gst_structure_get_value (structure, "codec_data");
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codec_data = gst_value_get_buffer (value);
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mpeg_util_parse_sequence_hdr (&hdr, GST_BUFFER_DATA (codec_data),
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GST_BUFFER_DATA (codec_data) + GST_BUFFER_SIZE (codec_data));
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switch (hdr.profile) {
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case 5:
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mpeg_dec->profile = VDP_DECODER_PROFILE_MPEG2_SIMPLE;
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break;
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default:
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mpeg_dec->profile = VDP_DECODER_PROFILE_MPEG2_MAIN;
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break;
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}
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}
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return TRUE;
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}
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@ -1,7 +1,5 @@
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/*
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* GStreamer
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* Copyright (C) 2005 Thomas Vander Stichele <thomas@apestaart.org>
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* Copyright (C) 2005 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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* Copyright (C) 2009 Carl-Anton Ingmarsson <ca.ingmarsson@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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@ -68,7 +66,7 @@ struct _GstVdpauMpegDecoder
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gboolean silent;
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gint version;
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VdpDecoderProfile profile;
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};
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struct _GstVdpauMpegDecoderClass
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227
sys/vdpau/mpegutil.c
Normal file
227
sys/vdpau/mpegutil.c
Normal file
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@ -0,0 +1,227 @@
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/* GStreamer
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* Copyright (C) 2007 Jan Schmidt <thaytan@mad.scientist.com>
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* Copyright (C) 2009 Carl-Anton Ingmarsson <ca.ingmarsson@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "mpegutil.h"
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guint8 bits[] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01 };
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guint32
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read_bits (guint8 * buf, gint start_bit, gint n_bits)
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{
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gint i;
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guint32 ret = 0x00;
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buf += start_bit / 8;
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start_bit %= 8;
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for (i = 0; i < n_bits; i++) {
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guint32 tmp;
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tmp = ((*buf & bits[start_bit]) >> (7 - start_bit));
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ret = (ret | (tmp << (n_bits - i - 1)));
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if (++start_bit == 8) {
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buf += 1;
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start_bit = 0;
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}
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}
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return ret;
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}
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guint8 *
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mpeg_util_find_start_code (guint32 * sync_word, guint8 * cur, guint8 * end)
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{
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guint32 code;
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if (G_UNLIKELY (cur == NULL))
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return NULL;
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code = *sync_word;
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while (cur < end) {
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code <<= 8;
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if (code == 0x00000100) {
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/* Reset the sync word accumulator */
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*sync_word = 0xffffffff;
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return cur;
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}
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/* Add the next available byte to the collected sync word */
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code |= *cur++;
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}
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*sync_word = code;
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return NULL;
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}
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static void
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set_fps_from_code (MPEGSeqHdr * hdr, guint8 fps_code)
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{
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const gint framerates[][2] = {
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{30, 1}, {24000, 1001}, {24, 1}, {25, 1},
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{30000, 1001}, {30, 1}, {50, 1}, {60000, 1001},
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{60, 1}, {30, 1}
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};
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if (fps_code < 10) {
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hdr->fps_n = framerates[fps_code][0];
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hdr->fps_d = framerates[fps_code][1];
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} else {
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/* Force a valid framerate */
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hdr->fps_n = 30000;
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hdr->fps_d = 1001;
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}
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}
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/* Set the Pixel Aspect Ratio in our hdr from a DAR code in the data */
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static void
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set_par_from_dar (MPEGSeqHdr * hdr, guint8 asr_code)
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{
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/* Pixel_width = DAR_width * display_vertical_size */
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/* Pixel_height = DAR_height * display_horizontal_size */
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switch (asr_code) {
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case 0x02: /* 3:4 DAR = 4:3 pixels */
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hdr->par_w = 4 * hdr->height;
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hdr->par_h = 3 * hdr->width;
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break;
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case 0x03: /* 9:16 DAR */
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hdr->par_w = 16 * hdr->height;
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hdr->par_h = 9 * hdr->width;
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break;
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case 0x04: /* 1:2.21 DAR */
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hdr->par_w = 221 * hdr->height;
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hdr->par_h = 100 * hdr->width;
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break;
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case 0x01: /* Square pixels */
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default:
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hdr->par_w = hdr->par_h = 1;
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break;
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}
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}
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static gboolean
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mpeg_util_parse_extension_packet (MPEGSeqHdr * hdr, guint8 * data, guint8 * end)
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{
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guint8 ext_code;
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if (G_UNLIKELY (data >= end))
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return FALSE; /* short extension packet */
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ext_code = data[0] >> 4;
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switch (ext_code) {
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case MPEG_PACKET_EXT_SEQUENCE:
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{
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/* Parse a Sequence Extension */
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guint8 horiz_size_ext, vert_size_ext;
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guint8 fps_n_ext, fps_d_ext;
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if (G_UNLIKELY ((end - data) < 6))
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/* need at least 10 bytes, minus 4 for the start code 000001b5 */
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return FALSE;
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horiz_size_ext = ((data[1] << 1) & 0x02) | ((data[2] >> 7) & 0x01);
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vert_size_ext = (data[2] >> 5) & 0x03;
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hdr->profile = read_bits (data, 7, 3);
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fps_n_ext = (data[5] >> 5) & 0x03;
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fps_d_ext = data[5] & 0x1f;
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hdr->fps_n *= (fps_n_ext + 1);
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hdr->fps_d *= (fps_d_ext + 1);
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hdr->width += (horiz_size_ext << 12);
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hdr->height += (vert_size_ext << 12);
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break;
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}
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default:
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break;
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}
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return TRUE;
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}
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gboolean
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mpeg_util_parse_sequence_hdr (MPEGSeqHdr * hdr, guint8 * data, guint8 * end)
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{
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guint32 code;
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guint8 dar_idx, fps_idx;
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guint32 sync_word = 0xffffffff;
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gboolean constrained_flag;
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gboolean load_intra_flag;
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gboolean load_non_intra_flag;
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if (G_UNLIKELY ((end - data) < 12))
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return FALSE; /* Too small to be a sequence header */
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code = GST_READ_UINT32_BE (data);
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if (G_UNLIKELY (code != (0x00000100 | MPEG_PACKET_SEQUENCE)))
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return FALSE;
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/* Skip the sync word */
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data += 4;
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/* Parse the MPEG 1 bits */
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hdr->mpeg_version = 1;
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code = GST_READ_UINT32_BE (data);
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hdr->width = (code >> 20) & 0xfff;
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hdr->height = (code >> 8) & 0xfff;
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dar_idx = (code >> 4) & 0xf;
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set_par_from_dar (hdr, dar_idx);
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fps_idx = code & 0xf;
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set_fps_from_code (hdr, fps_idx);
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constrained_flag = (data[7] >> 2) & 0x01;
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load_intra_flag = (data[7] >> 1) & 0x01;
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if (load_intra_flag) {
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if (G_UNLIKELY ((end - data) < 64))
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return FALSE;
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data += 64;
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}
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load_non_intra_flag = data[7] & 0x01;
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if (load_non_intra_flag) {
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if (G_UNLIKELY ((end - data) < 64))
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return FALSE;
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data += 64;
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}
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/* Advance past the rest of the MPEG-1 header */
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data += 8;
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/* Read MPEG-2 sequence extensions */
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data = mpeg_util_find_start_code (&sync_word, data, end);
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while (data != NULL) {
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if (G_UNLIKELY (data >= end))
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return FALSE;
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/* data points at the last byte of the start code */
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if (data[0] == MPEG_PACKET_EXTENSION) {
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if (!mpeg_util_parse_extension_packet (hdr, data + 1, end))
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return FALSE;
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hdr->mpeg_version = 2;
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}
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data = mpeg_util_find_start_code (&sync_word, data, end);
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}
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return TRUE;
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}
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63
sys/vdpau/mpegutil.h
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63
sys/vdpau/mpegutil.h
Normal file
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@ -0,0 +1,63 @@
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/* GStreamer
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* Copyright (C) 2007 Jan Schmidt <thaytan@mad.scientist.com>
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* Copyright (C) 2009 Carl-Anton Ingmarsson <ca.ingmarsson@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __MPEGUTIL_H__
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#define __MPEGUTIL_H__
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#include <gst/gst.h>
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typedef struct MPEGSeqHdr MPEGSeqHdr;
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/* Packet ID codes for different packet types we
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* care about */
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#define MPEG_PACKET_PICTURE 0x00
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#define MPEG_PACKET_SLICE_MIN 0x01
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#define MPEG_PACKET_SLICE_MAX 0xaf
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#define MPEG_PACKET_SEQUENCE 0xb3
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#define MPEG_PACKET_EXTENSION 0xb5
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#define MPEG_PACKET_SEQUENCE_END 0xb7
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#define MPEG_PACKET_GOP 0xb8
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#define MPEG_PACKET_NONE 0xff
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/* Extension codes we care about */
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#define MPEG_PACKET_EXT_SEQUENCE 0x01
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#define MPEG_PACKET_EXT_SEQUENCE_DISPLAY 0x02
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#define MPEG_PACKET_EXT_QUANT_MATRIX 0x03
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struct MPEGSeqHdr
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{
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/* 0 for unknown, else 1 or 2 */
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guint8 mpeg_version;
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/* Pixel-Aspect Ratio from DAR code via set_par_from_dar */
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gint par_w, par_h;
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/* Width and Height of the video */
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gint width, height;
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/* Framerate */
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gint fps_n, fps_d;
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/* mpeg2 decoder profile */
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gint profile;
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};
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gboolean mpeg_util_parse_sequence_hdr (MPEGSeqHdr *hdr,
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guint8 *data, guint8 *end);
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#endif
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