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gstreamer/gst-libs/gst/vaapi/gstvaapidecoder_mpeg4.c
Víctor Manuel Jáquez Leal a6518f6888 decoder: mpeg4: remove an spurious comparison 
The member size in GstMpeg4Packet is gsize which is unsigned, which cannot be
less than zero. Hence this pre-condition test is a no-op. This patch removes
that code.

https://bugzilla.gnome.org/show_bug.cgi?id=747312
2015-04-08 16:20:55 +02:00

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/*
* gstvaapidecoder_mpeg4.c - MPEG-4 decoder
*
* Copyright (C) 2011-2013 Intel Corporation
* Author: Halley Zhao <halley.zhao@intel.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
/**
* SECTION:gstvaapidecoder_mpeg4
* @short_description: MPEG-4 decoder, include h263/divx/xvid support
*/
#include "sysdeps.h"
#include <string.h>
#include <gst/base/gstbitreader.h>
#include <gst/codecparsers/gstmpeg4parser.h>
#include "gstvaapidecoder_mpeg4.h"
#include "gstvaapidecoder_objects.h"
#include "gstvaapidecoder_priv.h"
#include "gstvaapidisplay_priv.h"
#include "gstvaapiobject_priv.h"
#define DEBUG 1
#include "gstvaapidebug.h"
#define GST_VAAPI_DECODER_MPEG4_CAST(decoder) \
((GstVaapiDecoderMpeg4 *)(decoder))
typedef struct _GstVaapiDecoderMpeg4Private GstVaapiDecoderMpeg4Private;
typedef struct _GstVaapiDecoderMpeg4Class GstVaapiDecoderMpeg4Class;
struct _GstVaapiDecoderMpeg4Private {
GstVaapiProfile profile;
guint level;
guint width;
guint height;
guint fps_n;
guint fps_d;
guint coding_type;
GstMpeg4VisualObjectSequence vos_hdr;
GstMpeg4VisualObject vo_hdr;
GstMpeg4VideoSignalType signal_type;
GstMpeg4VideoObjectLayer vol_hdr;
GstMpeg4VideoObjectPlane vop_hdr;
GstMpeg4VideoPlaneShortHdr svh_hdr;
GstMpeg4VideoPacketHdr packet_hdr;
GstMpeg4SpriteTrajectory sprite_trajectory;
VAIQMatrixBufferMPEG4 iq_matrix;
GstVaapiPicture *curr_picture;
// forward reference pic
GstVaapiPicture *next_picture;
// backward reference pic
GstVaapiPicture *prev_picture;
GstClockTime seq_pts;
GstClockTime gop_pts;
GstClockTime pts_diff;
GstClockTime max_pts;
// anchor sync time base for any picture type,
// it is time base of backward reference frame
GstClockTime last_sync_time;
// time base for recent I/P/S frame,
// it is time base of forward reference frame for B frame
GstClockTime sync_time;
/* last non-b-frame time by resolution */
GstClockTime last_non_b_scale_time;
GstClockTime non_b_scale_time;
GstClockTime trb;
GstClockTime trd;
// temporal_reference of previous frame of svh
guint8 prev_t_ref;
guint is_opened : 1;
guint is_first_field : 1;
guint size_changed : 1;
guint profile_changed : 1;
guint progressive_sequence : 1;
guint closed_gop : 1;
guint broken_link : 1;
guint calculate_pts_diff : 1;
guint is_svh : 1;
};
/**
* GstVaapiDecoderMpeg4:
*
* A decoder based on Mpeg4.
*/
struct _GstVaapiDecoderMpeg4 {
/*< private >*/
GstVaapiDecoder parent_instance;
GstVaapiDecoderMpeg4Private priv;
};
/**
* GstVaapiDecoderMpeg4Class:
*
* A decoder class based on Mpeg4.
*/
struct _GstVaapiDecoderMpeg4Class {
/*< private >*/
GstVaapiDecoderClass parent_class;
};
static void
gst_vaapi_decoder_mpeg4_close(GstVaapiDecoderMpeg4 *decoder)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
gst_vaapi_picture_replace(&priv->curr_picture, NULL);
gst_vaapi_picture_replace(&priv->next_picture, NULL);
gst_vaapi_picture_replace(&priv->prev_picture, NULL);
}
static gboolean
gst_vaapi_decoder_mpeg4_open(GstVaapiDecoderMpeg4 *decoder)
{
GstVaapiDecoder *const base_decoder = GST_VAAPI_DECODER(decoder);
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstCaps *caps = NULL;
GstStructure *structure = NULL;
gst_vaapi_decoder_mpeg4_close(decoder);
priv->is_svh = 0;
caps = gst_vaapi_decoder_get_caps(base_decoder);
if (caps) {
structure = gst_caps_get_structure(caps, 0);
if (structure) {
if (gst_structure_has_name(structure, "video/x-h263")) {
priv->is_svh = 1;
priv->profile = GST_VAAPI_PROFILE_MPEG4_SIMPLE;
priv->prev_t_ref = -1;
}
}
}
return TRUE;
}
static void
gst_vaapi_decoder_mpeg4_destroy(GstVaapiDecoder *base_decoder)
{
GstVaapiDecoderMpeg4 * const decoder =
GST_VAAPI_DECODER_MPEG4_CAST(base_decoder);
gst_vaapi_decoder_mpeg4_close(decoder);
}
static gboolean
gst_vaapi_decoder_mpeg4_create(GstVaapiDecoder *base_decoder)
{
GstVaapiDecoderMpeg4 * const decoder =
GST_VAAPI_DECODER_MPEG4_CAST(base_decoder);
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
priv->profile = GST_VAAPI_PROFILE_MPEG4_SIMPLE;
priv->seq_pts = GST_CLOCK_TIME_NONE;
priv->gop_pts = GST_CLOCK_TIME_NONE;
priv->max_pts = GST_CLOCK_TIME_NONE;
priv->calculate_pts_diff = TRUE;
priv->size_changed = TRUE;
priv->profile_changed = TRUE;
return TRUE;
}
static inline void
copy_quant_matrix(guint8 dst[64], const guint8 src[64])
{
memcpy(dst, src, 64);
}
static GstVaapiDecoderStatus
ensure_context(GstVaapiDecoderMpeg4 *decoder)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstVaapiProfile profiles[2];
GstVaapiEntrypoint entrypoint = GST_VAAPI_ENTRYPOINT_VLD;
guint i, n_profiles = 0;
gboolean reset_context = FALSE;
if (priv->profile_changed) {
GST_DEBUG("profile changed");
priv->profile_changed = FALSE;
reset_context = TRUE;
profiles[n_profiles++] = priv->profile;
if (priv->profile == GST_VAAPI_PROFILE_MPEG4_SIMPLE)
profiles[n_profiles++] = GST_VAAPI_PROFILE_MPEG4_ADVANCED_SIMPLE;
for (i = 0; i < n_profiles; i++) {
if (gst_vaapi_display_has_decoder(GST_VAAPI_DECODER_DISPLAY(decoder),
profiles[i], entrypoint))
break;
}
if (i == n_profiles)
return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_PROFILE;
priv->profile = profiles[i];
}
if (priv->size_changed) {
GST_DEBUG("size changed");
priv->size_changed = FALSE;
reset_context = TRUE;
}
if (reset_context) {
GstVaapiContextInfo info;
info.profile = priv->profile;
info.entrypoint = entrypoint;
info.chroma_type = GST_VAAPI_CHROMA_TYPE_YUV420;
info.width = priv->width;
info.height = priv->height;
info.ref_frames = 2;
reset_context = gst_vaapi_decoder_ensure_context(
GST_VAAPI_DECODER(decoder),
&info
);
if (!reset_context)
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
}
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
ensure_quant_matrix(GstVaapiDecoderMpeg4 *decoder, GstVaapiPicture *picture)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
VAIQMatrixBufferMPEG4 *iq_matrix;
if (!priv->vol_hdr.load_intra_quant_mat && !priv->vol_hdr.load_non_intra_quant_mat) {
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
picture->iq_matrix = GST_VAAPI_IQ_MATRIX_NEW(MPEG4, decoder);
if (!picture->iq_matrix) {
GST_DEBUG("failed to allocate IQ matrix");
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
}
iq_matrix = picture->iq_matrix->param;
if (priv->vol_hdr.load_intra_quant_mat) {
iq_matrix->load_intra_quant_mat = 1;
copy_quant_matrix(iq_matrix->intra_quant_mat,
priv->vol_hdr.intra_quant_mat);
}
else
iq_matrix->load_intra_quant_mat = 0;
if (priv->vol_hdr.load_non_intra_quant_mat) {
iq_matrix->load_non_intra_quant_mat = 1;
copy_quant_matrix(iq_matrix->non_intra_quant_mat,
priv->vol_hdr.non_intra_quant_mat);
}
else
iq_matrix->load_non_intra_quant_mat = 0;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static inline GstVaapiDecoderStatus
render_picture(GstVaapiDecoderMpeg4 *decoder, GstVaapiPicture *picture)
{
if (!gst_vaapi_picture_output(picture))
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
/* decode_picture() start to decode a frame/picture
* decode_current_picture() finishe decoding a frame/picture
* (commit buffer to driver for decoding)
*/
static GstVaapiDecoderStatus
decode_current_picture(GstVaapiDecoderMpeg4 *decoder)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstVaapiPicture * const picture = priv->curr_picture;
GstVaapiDecoderStatus status = GST_VAAPI_DECODER_STATUS_SUCCESS;
if (picture) {
if (!gst_vaapi_picture_decode(picture))
status = GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
if (!GST_VAAPI_PICTURE_IS_REFERENCE(picture)) {
if ((priv->prev_picture && priv->next_picture) ||
(priv->closed_gop && priv->next_picture))
status = render_picture(decoder, picture);
}
gst_vaapi_picture_replace(&priv->curr_picture, NULL);
}
return status;
}
static GstVaapiDecoderStatus
decode_sequence(GstVaapiDecoderMpeg4 *decoder, const guint8 *buf, guint buf_size)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstMpeg4VisualObjectSequence * const vos_hdr = &priv->vos_hdr;
GstVaapiProfile profile;
if (gst_mpeg4_parse_visual_object_sequence(vos_hdr, buf, buf_size) != GST_MPEG4_PARSER_OK) {
GST_DEBUG("failed to parse sequence header");
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
priv->level = vos_hdr->level;
switch (vos_hdr->profile) {
case GST_MPEG4_PROFILE_SIMPLE:
profile = GST_VAAPI_PROFILE_MPEG4_SIMPLE;
break;
case GST_MPEG4_PROFILE_ADVANCED_SIMPLE:
case GST_MPEG4_PROFILE_SIMPLE_SCALABLE: /* shared profile with ADVANCED_SIMPLE */
profile = GST_VAAPI_PROFILE_MPEG4_ADVANCED_SIMPLE;
break;
default:
GST_DEBUG("unsupported profile %d", vos_hdr->profile);
return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_PROFILE;
}
if (priv->profile != profile) {
priv->profile = profile;
priv->profile_changed = TRUE;
}
priv->seq_pts = GST_VAAPI_DECODER_CODEC_FRAME(decoder)->pts;
priv->size_changed = TRUE;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
decode_sequence_end(GstVaapiDecoderMpeg4 *decoder)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstVaapiDecoderStatus status;
if (priv->curr_picture) {
status = decode_current_picture(decoder);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
status = render_picture(decoder, priv->curr_picture);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
}
if (priv->next_picture) {
status = render_picture(decoder, priv->next_picture);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
}
return GST_VAAPI_DECODER_STATUS_END_OF_STREAM;
}
static GstVaapiDecoderStatus
decode_visual_object(GstVaapiDecoderMpeg4 *decoder, const guint8 *buf, guint buf_size)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstMpeg4VisualObject * vo_hdr = &priv->vo_hdr;
GstMpeg4VideoSignalType * signal_type = &priv->signal_type;
if (gst_mpeg4_parse_visual_object (vo_hdr, signal_type, buf, buf_size) != GST_MPEG4_PARSER_OK) {
GST_DEBUG("failed to parse visual object");
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
/* XXX: video_signal_type isn't used for decoding */
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
decode_video_object_layer(GstVaapiDecoderMpeg4 *decoder, const guint8 *buf, guint buf_size)
{
GstVaapiDecoder * const base_decoder = GST_VAAPI_DECODER(decoder);
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstMpeg4VisualObject * vo_hdr = &priv->vo_hdr;
GstMpeg4VideoObjectLayer * vol_hdr = &priv->vol_hdr;
if (gst_mpeg4_parse_video_object_layer (vol_hdr, vo_hdr, buf, buf_size) != GST_MPEG4_PARSER_OK) {
GST_DEBUG("failed to parse video object layer");
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
priv->width = vol_hdr->width;
priv->height = vol_hdr->height;
priv->progressive_sequence = !vol_hdr->interlaced;
if (vol_hdr->fixed_vop_rate) {
priv->fps_n = vol_hdr->vop_time_increment_resolution;
priv->fps_d = vol_hdr->fixed_vop_time_increment;
gst_vaapi_decoder_set_framerate(base_decoder, priv->fps_n, priv->fps_d);
}
gst_vaapi_decoder_set_pixel_aspect_ratio(base_decoder, priv->vol_hdr.par_width, priv->vol_hdr.par_height);
gst_vaapi_decoder_set_picture_size(base_decoder, priv->width, priv->height);
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
decode_gop(GstVaapiDecoderMpeg4 *decoder, const guint8 *buf, guint buf_size)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstMpeg4GroupOfVOP gop;
GstClockTime gop_time;
if (buf_size >4) {
if (gst_mpeg4_parse_group_of_vop(&gop, buf, buf_size) != GST_MPEG4_PARSER_OK) {
GST_DEBUG("failed to parse GOP");
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
}
else {
gop.closed = 1;
gop.broken_link = 0;
gop.hours = 0;
gop.minutes = 0;
gop.seconds = 0;
}
priv->closed_gop = gop.closed;
priv->broken_link = gop.broken_link;
GST_DEBUG("GOP %02u:%02u:%02u (closed_gop %d, broken_link %d)",
gop.hours, gop.minutes, gop.seconds,
priv->closed_gop, priv->broken_link);
gop_time = gop.hours * 3600 + gop.minutes * 60 + gop.seconds;
priv->last_sync_time = gop_time;
priv->sync_time = gop_time;
if (priv->gop_pts != GST_CLOCK_TIME_NONE)
priv->pts_diff += gop_time * GST_SECOND - priv->gop_pts;
priv->gop_pts = gop_time * GST_SECOND;
priv->calculate_pts_diff = TRUE;
priv->is_first_field = TRUE;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
void
calculate_pts_diff(GstVaapiDecoderMpeg4 *decoder,
GstMpeg4VideoObjectLayer *vol_hdr,
GstMpeg4VideoObjectPlane *vop_hdr)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstClockTime frame_timestamp;
frame_timestamp = GST_VAAPI_DECODER_CODEC_FRAME(decoder)->pts;
if (frame_timestamp && frame_timestamp != GST_CLOCK_TIME_NONE) {
/* Buffer with timestamp */
if (priv->max_pts != GST_CLOCK_TIME_NONE &&
frame_timestamp < priv->max_pts) {
frame_timestamp = priv->max_pts +
gst_util_uint64_scale((vol_hdr->fixed_vop_rate ?
vol_hdr->fixed_vop_time_increment : 1),
GST_SECOND,
vol_hdr->vop_time_increment_resolution);
}
} else {
/* Buffer without timestamp set */
if (priv->max_pts == GST_CLOCK_TIME_NONE) /* first buffer */
frame_timestamp = 0;
else {
GstClockTime tmp_pts;
tmp_pts = priv->pts_diff + priv->gop_pts +
vop_hdr->modulo_time_base * GST_SECOND +
gst_util_uint64_scale(vop_hdr->time_increment,
GST_SECOND,
vol_hdr->vop_time_increment_resolution);
if (tmp_pts > priv->max_pts)
frame_timestamp = tmp_pts;
else
frame_timestamp = priv->max_pts +
gst_util_uint64_scale((vol_hdr->fixed_vop_rate ?
vol_hdr->fixed_vop_time_increment : 1),
GST_SECOND,
vol_hdr->vop_time_increment_resolution);
}
}
priv->pts_diff = frame_timestamp -
(priv->gop_pts + vop_hdr->modulo_time_base * GST_SECOND +
gst_util_uint64_scale(vop_hdr->time_increment, GST_SECOND,
vol_hdr->vop_time_increment_resolution));
}
static GstVaapiDecoderStatus
decode_picture(GstVaapiDecoderMpeg4 *decoder, const guint8 *buf, guint buf_size)
{
GstMpeg4ParseResult parser_result = GST_MPEG4_PARSER_OK;
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstMpeg4VideoObjectPlane * const vop_hdr = &priv->vop_hdr;
GstMpeg4VideoObjectLayer * const vol_hdr = &priv->vol_hdr;
GstMpeg4SpriteTrajectory * const sprite_trajectory = &priv->sprite_trajectory;
GstVaapiPicture *picture;
GstVaapiDecoderStatus status;
GstClockTime pts;
// context depends on priv->width and priv->height, so we move parse_vop a little earlier
if (priv->is_svh) {
parser_result = gst_mpeg4_parse_video_plane_short_header(&priv->svh_hdr, buf, buf_size);
}
else {
parser_result = gst_mpeg4_parse_video_object_plane(vop_hdr, sprite_trajectory, vol_hdr, buf, buf_size);
/* Need to skip this frame if VOP was not coded */
if (GST_MPEG4_PARSER_OK == parser_result && !vop_hdr->coded)
return (GstVaapiDecoderStatus) GST_VAAPI_DECODER_STATUS_DROP_FRAME;
}
if (parser_result != GST_MPEG4_PARSER_OK) {
GST_DEBUG("failed to parse picture header");
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
if (priv->is_svh) {
priv->width = priv->svh_hdr.vop_width;
priv->height = priv->svh_hdr.vop_height;
}
else {
if (!vop_hdr->width && !vop_hdr->height) {
vop_hdr->width = vol_hdr->width;
vop_hdr->height = vol_hdr->height;
}
priv->width = vop_hdr->width;
priv->height = vop_hdr->height;
}
status = ensure_context(decoder);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS) {
GST_DEBUG("failed to reset context");
return status;
}
if (priv->curr_picture) {
status = decode_current_picture(decoder);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
}
priv->curr_picture = GST_VAAPI_PICTURE_NEW(MPEG4, decoder);
if (!priv->curr_picture) {
GST_DEBUG("failed to allocate picture");
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
}
picture = priv->curr_picture;
status = ensure_quant_matrix(decoder, picture);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS) {
GST_DEBUG("failed to reset quantizer matrix");
return status;
}
/* 7.6.7 Temporal prediction structure
* forward reference frame B B B B B B backward reference frame
* | |
* nearest I/P/S in the past with vop_coded ==1 |
* nearest I/P/S in the future with any vop_coded
* fixme, it said that B frame shouldn't use backward reference frame
* when backward reference frame coded is 0
*/
if (priv->is_svh) {
priv->coding_type = priv->svh_hdr.picture_coding_type;
}
else {
priv->coding_type = priv->vop_hdr.coding_type;
}
switch (priv->coding_type) {
case GST_MPEG4_I_VOP:
picture->type = GST_VAAPI_PICTURE_TYPE_I;
if (priv->is_svh || vop_hdr->coded)
GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_REFERENCE);
break;
case GST_MPEG4_P_VOP:
picture->type = GST_VAAPI_PICTURE_TYPE_P;
if (priv->is_svh || vop_hdr->coded)
GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_REFERENCE);
break;
case GST_MPEG4_B_VOP:
picture->type = GST_VAAPI_PICTURE_TYPE_B;
break;
case GST_MPEG4_S_VOP:
picture->type = GST_VAAPI_PICTURE_TYPE_S;
// see 3.175 reference VOP
if (vop_hdr->coded)
GST_VAAPI_PICTURE_FLAG_SET(picture, GST_VAAPI_PICTURE_FLAG_REFERENCE);
break;
default:
GST_DEBUG("unsupported picture type %d", priv->coding_type);
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
}
if (!priv->is_svh && !vop_hdr->coded) {
status = render_picture(decoder, priv->prev_picture);
return status;
}
if (priv->is_svh) {
guint temp_ref = priv->svh_hdr.temporal_reference;
if (temp_ref < priv->prev_t_ref) {
temp_ref += 256;
}
guint delta_ref = temp_ref - priv->prev_t_ref;
pts = priv->sync_time;
// see temporal_reference definition in spec, 30000/1001Hz
pts += gst_util_uint64_scale(delta_ref, GST_SECOND*1001, 30000);
priv->sync_time = pts;
priv->prev_t_ref = priv->svh_hdr.temporal_reference;
}
else {
/* Update priv->pts_diff */
if (priv->calculate_pts_diff) {
calculate_pts_diff(decoder, vol_hdr, vop_hdr);
priv->calculate_pts_diff = FALSE;
}
/* Update presentation time, 6.3.5 */
if(vop_hdr->coding_type != GST_MPEG4_B_VOP) {
// increment basing on decoding order
priv->last_sync_time = priv->sync_time;
priv->sync_time = priv->last_sync_time + vop_hdr->modulo_time_base;
pts = priv->sync_time * GST_SECOND;
pts += gst_util_uint64_scale(vop_hdr->time_increment, GST_SECOND, vol_hdr->vop_time_increment_resolution);
priv->last_non_b_scale_time = priv->non_b_scale_time;
priv->non_b_scale_time = priv->sync_time * vol_hdr->vop_time_increment_resolution + vop_hdr->time_increment;
priv->trd = priv->non_b_scale_time - priv->last_non_b_scale_time;
}
else {
// increment basing on display oder
pts = (priv->last_sync_time + vop_hdr->modulo_time_base) * GST_SECOND;
pts += gst_util_uint64_scale(vop_hdr->time_increment, GST_SECOND, vol_hdr->vop_time_increment_resolution);
priv->trb = (priv->last_sync_time + vop_hdr->modulo_time_base) * vol_hdr->vop_time_increment_resolution +
vop_hdr->time_increment - priv->last_non_b_scale_time;
}
}
picture->pts = pts + priv->pts_diff;
if (priv->max_pts == GST_CLOCK_TIME_NONE || priv->max_pts < picture->pts)
priv->max_pts = picture->pts;
/* Update reference pictures */
/* XXX: consider priv->vol_hdr.low_delay, consider packed video frames for DivX/XviD */
if (GST_VAAPI_PICTURE_IS_REFERENCE(picture)) {
if (priv->next_picture)
status = render_picture(decoder, priv->next_picture);
gst_vaapi_picture_replace(&priv->prev_picture, priv->next_picture);
gst_vaapi_picture_replace(&priv->next_picture, picture);
}
return status;
}
static inline guint
get_vop_coding_type(GstVaapiPicture *picture)
{
return picture->type - GST_VAAPI_PICTURE_TYPE_I;
}
static gboolean
fill_picture(GstVaapiDecoderMpeg4 *decoder, GstVaapiPicture *picture)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
VAPictureParameterBufferMPEG4 * const pic_param = picture->param;
GstMpeg4VideoObjectPlane * const vop_hdr = &priv->vop_hdr;
/* Fill in VAPictureParameterBufferMPEG4 */
pic_param->forward_reference_picture = VA_INVALID_ID;
pic_param->backward_reference_picture = VA_INVALID_ID;
pic_param->vol_fields.value = 0;
pic_param->vop_fields.value = 0;
if(priv->is_svh) {
// vol_hdr Parameters
pic_param->vol_fields.bits.short_video_header = 1;
// does the following vol_hdr parameters matter for short video header?
pic_param->vol_fields.bits.chroma_format = 1; // I420, see table 6-15.
pic_param->vol_fields.bits.interlaced = 0;
pic_param->vol_fields.bits.obmc_disable = 1;
pic_param->vol_fields.bits.sprite_enable = 0;
pic_param->vol_fields.bits.sprite_warping_accuracy = 0;
pic_param->vol_fields.bits.quant_type = 0; //method 1; $7.4.4
pic_param->vol_fields.bits.quarter_sample = 0;
pic_param->vol_fields.bits.data_partitioned = 0;
pic_param->vol_fields.bits.reversible_vlc = 0;
pic_param->vol_fields.bits.resync_marker_disable = 1;
pic_param->no_of_sprite_warping_points = 0;
pic_param->quant_precision = 5;
// VOP parameters
pic_param->vop_width = priv->svh_hdr.vop_width;
pic_param->vop_height = priv->svh_hdr.vop_height;
pic_param->vop_fields.bits.vop_coding_type = priv->svh_hdr.picture_coding_type;
pic_param->vop_time_increment_resolution = priv->vol_hdr.vop_time_increment_resolution;
pic_param->num_gobs_in_vop = priv->svh_hdr.num_gobs_in_vop;
pic_param->num_macroblocks_in_gob = priv->svh_hdr.num_macroblocks_in_gob;
}
else {
// VOL parameters
pic_param->vol_fields.bits.short_video_header = 0;
pic_param->vol_fields.bits.chroma_format = priv->vol_hdr.chroma_format;
pic_param->vol_fields.bits.interlaced = priv->vol_hdr.interlaced;
pic_param->vol_fields.bits.obmc_disable = priv->vol_hdr.obmc_disable;
pic_param->vol_fields.bits.sprite_enable = priv->vol_hdr.sprite_enable;
pic_param->vol_fields.bits.sprite_warping_accuracy = priv->vol_hdr.sprite_warping_accuracy;
pic_param->vol_fields.bits.quant_type = priv->vol_hdr.quant_type;
pic_param->vol_fields.bits.quarter_sample = priv->vol_hdr.quarter_sample;
pic_param->vol_fields.bits.data_partitioned = priv->vol_hdr.data_partitioned;
pic_param->vol_fields.bits.reversible_vlc = priv->vol_hdr.reversible_vlc;
pic_param->vol_fields.bits.resync_marker_disable = priv->vol_hdr.resync_marker_disable;
pic_param->no_of_sprite_warping_points = priv->vol_hdr.no_of_sprite_warping_points;
int i =0;
for (i=0; i<3 && i<priv->vol_hdr.no_of_sprite_warping_points ; i++) {
pic_param->sprite_trajectory_du[i] = priv->sprite_trajectory.vop_ref_points[i];
pic_param->sprite_trajectory_dv[i] = priv->sprite_trajectory.sprite_ref_points[i];
}
pic_param->quant_precision = priv->vol_hdr.quant_precision;
// VOP parameters
pic_param->vop_width = vop_hdr->width;
pic_param->vop_height = vop_hdr->height;
pic_param->vop_fields.bits.vop_coding_type = vop_hdr->coding_type;
pic_param->vop_fields.bits.vop_rounding_type = vop_hdr->rounding_type;
pic_param->vop_fields.bits.intra_dc_vlc_thr = vop_hdr->intra_dc_vlc_thr;
pic_param->vop_fields.bits.top_field_first = vop_hdr->top_field_first;
pic_param->vop_fields.bits.alternate_vertical_scan_flag = vop_hdr->alternate_vertical_scan_flag;
pic_param->vop_fcode_forward = vop_hdr->fcode_forward;
pic_param->vop_fcode_backward = vop_hdr->fcode_backward;
pic_param->vop_time_increment_resolution = priv->vol_hdr.vop_time_increment_resolution;
}
pic_param->TRB = 0;
pic_param->TRD = 0;
switch (priv->coding_type) {
case GST_MPEG4_B_VOP:
pic_param->TRB = priv->trb;
pic_param->backward_reference_picture = priv->next_picture->surface_id;
pic_param->vop_fields.bits.backward_reference_vop_coding_type = get_vop_coding_type(priv->next_picture);
// fall-through
case GST_MPEG4_P_VOP:
pic_param->TRD = priv->trd;
if (priv->prev_picture)
pic_param->forward_reference_picture = priv->prev_picture->surface_id;
break;
}
if (priv->vol_hdr.interlaced) {
priv->is_first_field ^= 1;
}
return TRUE;
}
static GstVaapiDecoderStatus
decode_slice(
GstVaapiDecoderMpeg4 *decoder,
const guint8 *buf,
guint buf_size,
gboolean has_packet_header
)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstVaapiPicture * const picture = priv->curr_picture;
GstVaapiSlice *slice;
VASliceParameterBufferMPEG4 *slice_param;
GST_DEBUG("decoder silce: %p, %u bytes)", buf, buf_size);
// has_packet_header is ture for the 2+ slice
if (!has_packet_header && !fill_picture(decoder, picture))
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
slice = GST_VAAPI_SLICE_NEW(MPEG4, decoder, buf, buf_size);
if (!slice) {
GST_DEBUG("failed to allocate slice");
return GST_VAAPI_DECODER_STATUS_ERROR_ALLOCATION_FAILED;
}
gst_vaapi_picture_add_slice(picture, slice);
/* Fill in VASliceParameterBufferMPEG4 */
slice_param = slice->param;
if (priv->is_svh) {
slice_param->macroblock_offset = (priv->svh_hdr.size)%8;
slice_param->macroblock_number = 0;
// the header of first gob_layer is empty (gob_header_empty=1), use vop_quant
slice_param->quant_scale = priv->svh_hdr.vop_quant;
}
else {
if (has_packet_header) {
slice_param->macroblock_offset = priv->packet_hdr.size % 8;
slice_param->macroblock_number = priv->packet_hdr.macroblock_number;
slice_param->quant_scale = priv->packet_hdr.quant_scale;
}
else {
slice_param->macroblock_offset = priv->vop_hdr.size % 8;
slice_param->macroblock_number = 0;
slice_param->quant_scale = priv->vop_hdr.quant;
}
}
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
decode_packet(GstVaapiDecoderMpeg4 *decoder, GstMpeg4Packet packet)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstMpeg4Packet *tos = &packet;
GstVaapiDecoderStatus status;
// packet.size is the size from current marker to the next.
if (tos->type == GST_MPEG4_VISUAL_OBJ_SEQ_START) {
status = decode_sequence(decoder, packet.data + packet.offset, packet.size);
}
else if (tos->type == GST_MPEG4_VISUAL_OBJ_SEQ_END) {
status = decode_sequence_end(decoder);
}
else if (tos->type == GST_MPEG4_VISUAL_OBJ) {
status = decode_visual_object(decoder, packet.data + packet.offset, packet.size);
}
else if (tos->type >= GST_MPEG4_VIDEO_OBJ_FIRST && tos->type <= GST_MPEG4_VIDEO_OBJ_LAST) {
GST_WARNING("unexpected marker: (GST_MPEG4_VIDEO_OBJ_FIRST, GST_MPEG4_VIDEO_OBJ_LAST)");
status = GST_VAAPI_DECODER_STATUS_SUCCESS;
}
else if (tos->type >= GST_MPEG4_VIDEO_LAYER_FIRST && tos->type <= GST_MPEG4_VIDEO_LAYER_LAST) {
status = decode_video_object_layer(decoder, packet.data + packet.offset, packet.size);
}
else if (tos->type == GST_MPEG4_GROUP_OF_VOP) {
status = decode_gop(decoder, packet.data + packet.offset, packet.size);
}
else if (tos->type == GST_MPEG4_VIDEO_OBJ_PLANE) {
status = decode_picture(decoder, packet.data + packet.offset, packet.size);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
/* decode slice
* A resync marker shall only be located immediately before a macroblock
* (or video packet header if exists) and aligned with a byte
* either start_code or resync_marker are scaned/measured by byte,
* while the header itself are parsed/measured in bit
* it means: resync_marker(video_packet_header) start from byte boundary,
* while MB doesn't start from byte boundary -- it is what 'macroblock_offset'
* in slice refer to
*/
const guint8 *_data = packet.data + packet.offset + priv->vop_hdr.size/8;
gint _data_size = packet.size - (priv->vop_hdr.size/8);
GstMpeg4Packet video_packet;
if (priv->vol_hdr.resync_marker_disable) {
status = decode_slice(decoder, _data, _data_size, FALSE);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
}
else {
// next start_code is required to determine the end of last slice
_data_size += 4;
GstMpeg4ParseResult ret = GST_MPEG4_PARSER_OK;
gboolean first_slice = TRUE;
while (_data_size > 0) {
// we can skip user data here
ret = gst_mpeg4_parse(&video_packet, TRUE, &priv->vop_hdr, _data, 0, _data_size);
if(ret != GST_MPEG4_PARSER_OK) {
break;
}
if (first_slice) {
status = decode_slice(decoder, _data, video_packet.size, FALSE);
first_slice = FALSE;
}
else {
_data += video_packet.offset;
_data_size -= video_packet.offset;
ret = gst_mpeg4_parse_video_packet_header (&priv->packet_hdr, &priv->vol_hdr, &priv->vop_hdr, &priv->sprite_trajectory, _data, _data_size);
status = decode_slice(decoder,_data + priv->packet_hdr.size/8, video_packet.size - priv->packet_hdr.size/8, TRUE);
}
_data += video_packet.size;
_data_size -= video_packet.size;
}
}
status = decode_current_picture(decoder);
}
else if (tos->type == GST_MPEG4_USER_DATA
|| tos->type == GST_MPEG4_VIDEO_SESSION_ERR
|| tos->type == GST_MPEG4_FBA
|| tos->type == GST_MPEG4_FBA_PLAN
|| tos->type == GST_MPEG4_MESH
|| tos->type == GST_MPEG4_MESH_PLAN
|| tos->type == GST_MPEG4_STILL_TEXTURE_OBJ
|| tos->type == GST_MPEG4_TEXTURE_SPATIAL
|| tos->type == GST_MPEG4_TEXTURE_SNR_LAYER
|| tos->type == GST_MPEG4_TEXTURE_TILE
|| tos->type == GST_MPEG4_SHAPE_LAYER
|| tos->type == GST_MPEG4_STUFFING
|| tos->type == GST_MPEG4_SYSTEM_FIRST
|| tos->type == GST_MPEG4_SYSTEM_LAST) {
GST_WARNING("Ignore marker: %x\n", tos->type);
status = GST_VAAPI_DECODER_STATUS_SUCCESS;
}
else {
GST_ERROR("unsupported start code %x\n", tos->type);
status = GST_VAAPI_DECODER_STATUS_SUCCESS;
}
return status;
}
static GstVaapiDecoderStatus
decode_buffer(GstVaapiDecoderMpeg4 *decoder, const guchar *buf, guint buf_size)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstVaapiDecoderStatus status;
GstMpeg4Packet packet;
guint ofs;
if (priv->is_svh) {
status = decode_picture(decoder, buf, buf_size);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
ofs = priv->svh_hdr.size / 8;
status = decode_slice(decoder, buf + ofs, buf_size - ofs, FALSE);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
}
else {
packet.data = buf;
packet.offset = 0;
packet.size = buf_size;
packet.type = (GstMpeg4StartCode)packet.data[0];
status = decode_packet(decoder, packet);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
}
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
gst_vaapi_decoder_mpeg4_decode_codec_data(GstVaapiDecoder *base_decoder,
const guchar *_buf, guint _buf_size)
{
GstVaapiDecoderMpeg4 * const decoder =
GST_VAAPI_DECODER_MPEG4_CAST(base_decoder);
GstVaapiDecoderStatus status = GST_VAAPI_DECODER_STATUS_SUCCESS;
guchar *buf;
guint pos, buf_size;
// add additional 0x000001b2 to enclose the last header
buf_size = _buf_size + 4;
buf = malloc(buf_size);
memcpy(buf, _buf, buf_size);
buf[buf_size-4] = 0;
buf[buf_size-3] = 0;
buf[buf_size-2] = 1;
buf[buf_size-1] = 0xb2;
pos = 0;
GstMpeg4Packet packet;
GstMpeg4ParseResult result = GST_MPEG4_PARSER_OK;
while (result == GST_MPEG4_PARSER_OK && pos < buf_size) {
result = gst_mpeg4_parse(&packet, FALSE, NULL, buf, pos, buf_size);
if (result != GST_MPEG4_PARSER_OK) {
break;
}
status = decode_packet(decoder, packet);
if (GST_VAAPI_DECODER_STATUS_SUCCESS == status) {
pos = packet.offset + packet.size;
}
else {
GST_WARNING("decode mp4 packet failed when decoding codec data\n");
break;
}
}
free(buf);
return status;
}
static GstVaapiDecoderStatus
ensure_decoder(GstVaapiDecoderMpeg4 *decoder)
{
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstVaapiDecoderStatus status;
if (!priv->is_opened) {
priv->is_opened = gst_vaapi_decoder_mpeg4_open(decoder);
if (!priv->is_opened)
return GST_VAAPI_DECODER_STATUS_ERROR_UNSUPPORTED_CODEC;
status = gst_vaapi_decoder_decode_codec_data(
GST_VAAPI_DECODER_CAST(decoder));
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
}
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
gst_vaapi_decoder_mpeg4_parse(GstVaapiDecoder *base_decoder,
GstAdapter *adapter, gboolean at_eos, GstVaapiDecoderUnit *unit)
{
GstVaapiDecoderMpeg4 * const decoder =
GST_VAAPI_DECODER_MPEG4_CAST(base_decoder);
GstVaapiDecoderMpeg4Private * const priv = &decoder->priv;
GstVaapiDecoderStatus status;
GstMpeg4Packet packet;
GstMpeg4ParseResult result;
const guchar *buf;
guint size, buf_size, flags = 0;
status = ensure_decoder(decoder);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
size = gst_adapter_available(adapter);
buf = gst_adapter_map(adapter, size);
if (!buf)
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
packet.type = GST_MPEG4_USER_DATA;
if (priv->is_svh)
result = gst_h263_parse(&packet, buf, 0, size);
else
result = gst_mpeg4_parse(&packet, FALSE, NULL, buf, 0, size);
if (result == GST_MPEG4_PARSER_NO_PACKET_END && at_eos)
packet.size = size - packet.offset;
else if (result == GST_MPEG4_PARSER_ERROR)
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
else if (result != GST_MPEG4_PARSER_OK)
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
buf_size = packet.size;
gst_adapter_flush(adapter, packet.offset);
unit->size = buf_size;
/* Check for start of new picture */
switch (packet.type) {
case GST_MPEG4_VIDEO_SESSION_ERR:
case GST_MPEG4_FBA:
case GST_MPEG4_FBA_PLAN:
case GST_MPEG4_MESH:
case GST_MPEG4_MESH_PLAN:
case GST_MPEG4_STILL_TEXTURE_OBJ:
case GST_MPEG4_TEXTURE_SPATIAL:
case GST_MPEG4_TEXTURE_SNR_LAYER:
case GST_MPEG4_TEXTURE_TILE:
case GST_MPEG4_SHAPE_LAYER:
case GST_MPEG4_STUFFING:
gst_adapter_flush(adapter, packet.size);
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
case GST_MPEG4_USER_DATA:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_SKIP;
break;
case GST_MPEG4_VISUAL_OBJ_SEQ_END:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_FRAME_END;
flags |= GST_VAAPI_DECODER_UNIT_FLAG_STREAM_END;
break;
case GST_MPEG4_VIDEO_OBJ_PLANE:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_SLICE;
flags |= GST_VAAPI_DECODER_UNIT_FLAG_FRAME_END;
/* fall-through */
case GST_MPEG4_VISUAL_OBJ_SEQ_START:
case GST_MPEG4_VISUAL_OBJ:
case GST_MPEG4_GROUP_OF_VOP:
flags |= GST_VAAPI_DECODER_UNIT_FLAG_FRAME_START;
break;
default:
if (packet.type >= GST_MPEG4_VIDEO_OBJ_FIRST &&
packet.type <= GST_MPEG4_VIDEO_OBJ_LAST) {
gst_adapter_flush(adapter, packet.size);
return GST_VAAPI_DECODER_STATUS_ERROR_NO_DATA;
}
if (packet.type >= GST_MPEG4_VIDEO_LAYER_FIRST &&
packet.type <= GST_MPEG4_VIDEO_LAYER_LAST) {
break;
}
if (packet.type >= GST_MPEG4_SYSTEM_FIRST &&
packet.type <= GST_MPEG4_SYSTEM_LAST) {
flags |= GST_VAAPI_DECODER_UNIT_FLAG_SKIP;
break;
}
GST_WARNING("unsupported start code (0x%02x)", packet.type);
return GST_VAAPI_DECODER_STATUS_ERROR_BITSTREAM_PARSER;
}
GST_VAAPI_DECODER_UNIT_FLAG_SET(unit, flags);
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static GstVaapiDecoderStatus
gst_vaapi_decoder_mpeg4_decode(GstVaapiDecoder *base_decoder,
GstVaapiDecoderUnit *unit)
{
GstVaapiDecoderMpeg4 * const decoder =
GST_VAAPI_DECODER_MPEG4_CAST(base_decoder);
GstVaapiDecoderStatus status;
GstBuffer * const buffer =
GST_VAAPI_DECODER_CODEC_FRAME(decoder)->input_buffer;
GstMapInfo map_info;
status = ensure_decoder(decoder);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
if (!gst_buffer_map(buffer, &map_info, GST_MAP_READ)) {
GST_ERROR("failed to map buffer");
return GST_VAAPI_DECODER_STATUS_ERROR_UNKNOWN;
}
status = decode_buffer(decoder, map_info.data + unit->offset, unit->size);
gst_buffer_unmap(buffer, &map_info);
if (status != GST_VAAPI_DECODER_STATUS_SUCCESS)
return status;
return GST_VAAPI_DECODER_STATUS_SUCCESS;
}
static void
gst_vaapi_decoder_mpeg4_class_init(GstVaapiDecoderMpeg4Class *klass)
{
GstVaapiMiniObjectClass * const object_class =
GST_VAAPI_MINI_OBJECT_CLASS(klass);
GstVaapiDecoderClass * const decoder_class = GST_VAAPI_DECODER_CLASS(klass);
object_class->size = sizeof(GstVaapiDecoderMpeg4);
object_class->finalize = (GDestroyNotify)gst_vaapi_decoder_finalize;
decoder_class->create = gst_vaapi_decoder_mpeg4_create;
decoder_class->destroy = gst_vaapi_decoder_mpeg4_destroy;
decoder_class->parse = gst_vaapi_decoder_mpeg4_parse;
decoder_class->decode = gst_vaapi_decoder_mpeg4_decode;
decoder_class->decode_codec_data =
gst_vaapi_decoder_mpeg4_decode_codec_data;
}
static inline const GstVaapiDecoderClass *
gst_vaapi_decoder_mpeg4_class(void)
{
static GstVaapiDecoderMpeg4Class g_class;
static gsize g_class_init = FALSE;
if (g_once_init_enter(&g_class_init)) {
gst_vaapi_decoder_mpeg4_class_init(&g_class);
g_once_init_leave(&g_class_init, TRUE);
}
return GST_VAAPI_DECODER_CLASS(&g_class);
}
/**
* gst_vaapi_decoder_mpeg4_new:
* @display: a #GstVaapiDisplay
* @caps: a #GstCaps holding codec information
*
* Creates a new #GstVaapiDecoder for MPEG-2 decoding. The @caps can
* hold extra information like codec-data and pictured coded size.
*
* Return value: the newly allocated #GstVaapiDecoder object
*/
GstVaapiDecoder *
gst_vaapi_decoder_mpeg4_new(GstVaapiDisplay *display, GstCaps *caps)
{
return gst_vaapi_decoder_new(gst_vaapi_decoder_mpeg4_class(),
display, caps);
}
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