gstreamer/subprojects/gst-plugins-bad/sys/v4l2codecs/gstv4l2codecmpeg2dec.c
Nicolas Dufresne c4216a693c v4l2codecs: mpeg2: Check that the decoder output formats
This is to avoid exposing a decoder for which we don't support any
output format. This happens on platform using vendor formats or
not yet supported tiles formats.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1439>
2021-12-10 21:37:14 +00:00

1075 lines
34 KiB
C

/* GStreamer
* Copyright (C) 2020 Daniel Almeida <daniel.almeida@collabora.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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "gstv4l2codecallocator.h"
#include "gstv4l2codecmpeg2dec.h"
#include "gstv4l2codecpool.h"
#include "linux/v4l2-controls.h"
#define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
#define V4L2_MIN_KERNEL_VER_MAJOR 5
#define V4L2_MIN_KERNEL_VER_MINOR 14
#define V4L2_MIN_KERNEL_VERSION \
KERNEL_VERSION(V4L2_MIN_KERNEL_VER_MAJOR, V4L2_MIN_KERNEL_VER_MINOR, 0)
#define MPEG2_BITDEPTH 8
GST_DEBUG_CATEGORY_STATIC (v4l2_mpeg2dec_debug);
#define GST_CAT_DEFAULT v4l2_mpeg2dec_debug
enum
{
PROP_0,
PROP_LAST = PROP_0
};
static GstStaticPadTemplate sink_template =
GST_STATIC_PAD_TEMPLATE (GST_VIDEO_DECODER_SINK_NAME,
GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"systemstream=(boolean) false, "
"mpegversion=(int) 2, " "profile=(string) {main, simple} "));
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE (GST_VIDEO_DECODER_SRC_NAME,
GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS (GST_VIDEO_CAPS_MAKE ("{ NV12, YUY2, NV12_32L32 }")));
struct _GstV4l2CodecMpeg2Dec
{
GstMpeg2Decoder parent;
GstV4l2Decoder *decoder;
GstVideoCodecState *output_state;
GstVideoInfo vinfo;
guint16 width;
guint16 height;
guint chroma_format;
gboolean interlaced;
GstMpegVideoProfile profile;
guint16 vbv_buffer_size;
gboolean need_sequence;
gboolean need_quantiser;
struct v4l2_ctrl_mpeg2_sequence v4l2_sequence;
struct v4l2_ctrl_mpeg2_picture v4l2_picture;
struct v4l2_ctrl_mpeg2_quantisation v4l2_quantisation;
GstV4l2CodecAllocator *sink_allocator;
GstV4l2CodecAllocator *src_allocator;
GstV4l2CodecPool *src_pool;
gint min_pool_size;
gboolean has_videometa;
gboolean need_negotiation;
GstMemory *bitstream;
GstMapInfo bitstream_map;
gboolean copy_frames;
};
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstV4l2CodecMpeg2Dec,
gst_v4l2_codec_mpeg2_dec, GST_TYPE_MPEG2_DECODER,
GST_DEBUG_CATEGORY_INIT (v4l2_mpeg2dec_debug, "v4l2codecs-mpeg2dec", 0,
"V4L2 stateless mpeg2 decoder"));
#define parent_class gst_v4l2_codec_mpeg2_dec_parent_class
static guint
gst_v4l2_codec_mpeg2_dec_get_preferred_output_delay (GstMpeg2Decoder * decoder,
gboolean is_live)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (decoder);
guint delay;
if (is_live)
delay = 0;
else
/* Just one for now, perhaps we can make this configurable in the future. */
delay = 1;
gst_v4l2_decoder_set_render_delay (self->decoder, delay);
return delay;
}
static gboolean
gst_v4l2_codec_mpeg2_dec_open (GstVideoDecoder * decoder)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (decoder);
guint version;
if (!gst_v4l2_decoder_open (self->decoder)) {
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
("Failed to open mpeg2 decoder"),
("gst_v4l2_decoder_open() failed: %s", g_strerror (errno)));
return FALSE;
}
version = gst_v4l2_decoder_get_version (self->decoder);
if (version < V4L2_MIN_KERNEL_VERSION) {
GST_ERROR_OBJECT (self,
"V4L2 API v%u.%u too old, at least v%u.%u required",
(version >> 16) & 0xff, (version >> 8) & 0xff,
V4L2_MIN_KERNEL_VER_MAJOR, V4L2_MIN_KERNEL_VER_MINOR);
gst_v4l2_decoder_close (self->decoder);
return FALSE;
}
return TRUE;
}
static gboolean
gst_v4l2_codec_mpeg2_dec_close (GstVideoDecoder * decoder)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (decoder);
return gst_v4l2_decoder_close (self->decoder);
}
static void
gst_v4l2_codec_mpeg2_dec_reset_allocation (GstV4l2CodecMpeg2Dec * self)
{
if (self->sink_allocator) {
gst_v4l2_codec_allocator_detach (self->sink_allocator);
g_clear_object (&self->sink_allocator);
}
if (self->src_allocator) {
gst_v4l2_codec_allocator_detach (self->src_allocator);
g_clear_object (&self->src_allocator);
g_clear_object (&self->src_pool);
}
}
static gboolean
gst_v4l2_codec_mpeg2_dec_stop (GstVideoDecoder * decoder)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (decoder);
gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SINK);
gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SRC);
gst_v4l2_codec_mpeg2_dec_reset_allocation (self);
if (self->output_state)
gst_video_codec_state_unref (self->output_state);
self->output_state = NULL;
return GST_VIDEO_DECODER_CLASS (parent_class)->stop (decoder);
}
static gint
get_pixel_bitdepth (GstV4l2CodecMpeg2Dec * self)
{
gint depth;
switch (self->chroma_format) {
case 0:
/* 4:0:0 */
depth = MPEG2_BITDEPTH;
break;
case 1:
/* 4:2:0 */
depth = MPEG2_BITDEPTH + MPEG2_BITDEPTH / 2;
break;
case 2:
/* 4:2:2 */
depth = 2 * MPEG2_BITDEPTH;
break;
case 3:
/* 4:4:4 */
depth = 3 * MPEG2_BITDEPTH;
break;
default:
GST_WARNING_OBJECT (self, "Unsupported chroma format %i",
self->chroma_format);
depth = 0;
break;
}
return depth;
}
static gboolean
gst_v4l2_codec_mpeg2_dec_negotiate (GstVideoDecoder * decoder)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (decoder);
GstMpeg2Decoder *mpeg2dec = GST_MPEG2_DECODER (decoder);
/* *INDENT-OFF* */
struct v4l2_ext_control control[] = {
{
.id = V4L2_CID_STATELESS_MPEG2_SEQUENCE,
.ptr = &self->v4l2_sequence,
.size = sizeof(self->v4l2_sequence),
},
{
.id = V4L2_CID_STATELESS_MPEG2_QUANTISATION,
.ptr = &self->v4l2_quantisation,
.size = sizeof(self->v4l2_quantisation),
},
};
/* *INDENT-ON* */
GstCaps *filter, *caps;
/* Ignore downstream renegotiation request. */
if (!self->need_negotiation)
return TRUE;
self->need_negotiation = FALSE;
GST_DEBUG_OBJECT (self, "Negotiate");
gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SINK);
gst_v4l2_decoder_streamoff (self->decoder, GST_PAD_SRC);
gst_v4l2_codec_mpeg2_dec_reset_allocation (self);
if (!gst_v4l2_decoder_set_sink_fmt (self->decoder, V4L2_PIX_FMT_MPEG2_SLICE,
self->width, self->height, get_pixel_bitdepth (self))) {
GST_ELEMENT_ERROR (self, CORE, NEGOTIATION,
("Failed to configure mpeg2 decoder"),
("gst_v4l2_decoder_set_sink_fmt() failed: %s", g_strerror (errno)));
gst_v4l2_decoder_close (self->decoder);
return FALSE;
}
if (!gst_v4l2_decoder_set_controls (self->decoder, NULL, control,
G_N_ELEMENTS (control))) {
GST_ELEMENT_ERROR (decoder, RESOURCE, WRITE,
("Driver does not support the selected stream."), (NULL));
return FALSE;
}
filter = gst_v4l2_decoder_enum_src_formats (self->decoder);
if (!filter) {
GST_ELEMENT_ERROR (self, CORE, NEGOTIATION,
("No supported decoder output formats"), (NULL));
return FALSE;
}
GST_DEBUG_OBJECT (self, "Supported output formats: %" GST_PTR_FORMAT, filter);
caps = gst_pad_peer_query_caps (decoder->srcpad, filter);
gst_caps_unref (filter);
GST_DEBUG_OBJECT (self, "Peer supported formats: %" GST_PTR_FORMAT, caps);
if (!gst_v4l2_decoder_select_src_format (self->decoder, caps, &self->vinfo)) {
GST_ELEMENT_ERROR (self, CORE, NEGOTIATION,
("Unsupported bitdepth/chroma format"),
("No support for %ux%u chroma IDC %i", self->width,
self->height, self->chroma_format));
gst_caps_unref (caps);
return FALSE;
}
gst_caps_unref (caps);
if (self->output_state)
gst_video_codec_state_unref (self->output_state);
self->output_state =
gst_video_decoder_set_output_state (GST_VIDEO_DECODER (self),
self->vinfo.finfo->format, self->width,
self->height, mpeg2dec->input_state);
if (self->interlaced)
self->output_state->info.interlace_mode =
GST_VIDEO_INTERLACE_MODE_INTERLEAVED;
self->output_state->caps = gst_video_info_to_caps (&self->output_state->info);
if (GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder)) {
if (!gst_v4l2_decoder_streamon (self->decoder, GST_PAD_SINK)) {
GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
("Could not enable the decoder driver."),
("VIDIOC_STREAMON(SINK) failed: %s", g_strerror (errno)));
return FALSE;
}
if (!gst_v4l2_decoder_streamon (self->decoder, GST_PAD_SRC)) {
GST_ELEMENT_ERROR (self, RESOURCE, FAILED,
("Could not enable the decoder driver."),
("VIDIOC_STREAMON(SRC) failed: %s", g_strerror (errno)));
return FALSE;
}
return TRUE;
}
return FALSE;
}
static gboolean
gst_v4l2_codec_mpeg2_dec_decide_allocation (GstVideoDecoder * decoder,
GstQuery * query)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (decoder);
guint min = 0, num_bitstream;
self->has_videometa = gst_query_find_allocation_meta (query,
GST_VIDEO_META_API_TYPE, NULL);
g_clear_object (&self->src_pool);
g_clear_object (&self->src_allocator);
if (gst_query_get_n_allocation_pools (query) > 0)
gst_query_parse_nth_allocation_pool (query, 0, NULL, NULL, &min, NULL);
min = MAX (2, min);
/* note the dpb size is fixed at 2 */
num_bitstream = 1 +
MAX (1, gst_v4l2_decoder_get_render_delay (self->decoder));
self->sink_allocator = gst_v4l2_codec_allocator_new (self->decoder,
GST_PAD_SINK, num_bitstream);
self->src_allocator = gst_v4l2_codec_allocator_new (self->decoder,
GST_PAD_SRC, self->min_pool_size + min + 4);
self->src_pool = gst_v4l2_codec_pool_new (self->src_allocator, &self->vinfo);
/* Our buffer pool is internal, we will let the base class create a video
* pool, and use it if we are running out of buffers or if downstream does
* not support GstVideoMeta */
return GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation
(decoder, query);
}
static GstFlowReturn
gst_v4l2_codec_mpeg2_dec_new_sequence (GstMpeg2Decoder * decoder,
const GstMpegVideoSequenceHdr * seq,
const GstMpegVideoSequenceExt * seq_ext,
const GstMpegVideoSequenceDisplayExt * seq_display_ext,
const GstMpegVideoSequenceScalableExt * seq_scalable_ext)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (decoder);
gboolean negotiation_needed = FALSE;
gboolean interlaced;
guint16 width;
guint16 height;
guint16 vbv_buffer_size;
GstMpegVideoProfile mpeg_profile;
GST_LOG_OBJECT (self, "New sequence");
interlaced = seq_ext ? !seq_ext->progressive : FALSE;
if (self->interlaced != interlaced) {
GST_INFO_OBJECT (self, "interlaced sequence change");
self->interlaced = interlaced;
negotiation_needed = TRUE;
}
width = seq->width;
height = seq->height;
vbv_buffer_size = seq->vbv_buffer_size_value;
if (seq_ext) {
width = (width & 0x0fff) | ((guint32) seq_ext->horiz_size_ext << 12);
height = (height & 0x0fff) | ((guint32) seq_ext->vert_size_ext << 12);
vbv_buffer_size = (vbv_buffer_size & 0x03ff) | ((guint32)
seq_ext->vbv_buffer_size_extension << 10);
}
if (self->width != width || self->height != height) {
GST_INFO_OBJECT (self, "resolution change %dx%d -> %dx%d",
self->width, self->height, width, height);
self->width = width;
self->height = height;
negotiation_needed = TRUE;
}
if (self->vbv_buffer_size != vbv_buffer_size) {
GST_INFO_OBJECT (self, "vbv buffer size change %d -> %d",
self->vbv_buffer_size, vbv_buffer_size);
self->vbv_buffer_size = vbv_buffer_size;
negotiation_needed = TRUE;
}
mpeg_profile = GST_MPEG_VIDEO_PROFILE_MAIN;
if (seq_ext)
mpeg_profile = seq_ext->profile;
if (mpeg_profile != GST_MPEG_VIDEO_PROFILE_MAIN &&
mpeg_profile != GST_MPEG_VIDEO_PROFILE_SIMPLE) {
GST_ERROR_OBJECT (self, "Cannot support profile %d", mpeg_profile);
return GST_FLOW_ERROR;
}
if (self->profile != mpeg_profile) {
GST_INFO_OBJECT (self, "Profile change %d -> %d",
self->profile, mpeg_profile);
self->profile = mpeg_profile;
self->need_negotiation = TRUE;
}
if (self->vinfo.finfo->format == GST_VIDEO_FORMAT_UNKNOWN)
negotiation_needed = TRUE;
/* copy quantiser from the sequence header,
* if none is provided this will copy the default ones
* added by the parser
*/
memcpy (self->v4l2_quantisation.intra_quantiser_matrix,
seq->intra_quantizer_matrix,
sizeof (self->v4l2_quantisation.intra_quantiser_matrix));;
memcpy (self->v4l2_quantisation.non_intra_quantiser_matrix,
seq->non_intra_quantizer_matrix,
sizeof (self->v4l2_quantisation.non_intra_quantiser_matrix));;
/* *INDENT-OFF* */
self->v4l2_sequence = (struct v4l2_ctrl_mpeg2_sequence) {
.horizontal_size = self->width,
.vertical_size = self->height,
.vbv_buffer_size = self->vbv_buffer_size * 16 * 1024,
.profile_and_level_indication =
seq_ext ? (seq_ext->profile << 4) | (seq_ext->
level << 1) | seq_ext->profile_level_escape_bit : 0,
.chroma_format = seq_ext ? seq_ext->chroma_format : 0,
.flags = seq_ext->progressive ? V4L2_MPEG2_SEQ_FLAG_PROGRESSIVE : 0,
};
/* *INDENT-ON* */
if (negotiation_needed) {
self->need_negotiation = TRUE;
if (!gst_video_decoder_negotiate (GST_VIDEO_DECODER (self))) {
GST_ERROR_OBJECT (self, "Failed to negotiate with downstream");
return GST_FLOW_ERROR;
}
} else {
self->need_sequence = TRUE;
self->need_quantiser = TRUE;
}
/* Check if we can zero-copy buffers */
if (!self->has_videometa) {
GstVideoInfo ref_vinfo;
gint i;
gst_video_info_set_format (&ref_vinfo, GST_VIDEO_INFO_FORMAT (&self->vinfo),
self->width, self->height);
for (i = 0; i < GST_VIDEO_INFO_N_PLANES (&self->vinfo); i++) {
if (self->vinfo.stride[i] != ref_vinfo.stride[i] ||
self->vinfo.offset[i] != ref_vinfo.offset[i]) {
GST_WARNING_OBJECT (self,
"GstVideoMeta support required, copying frames.");
self->copy_frames = TRUE;
break;
}
}
} else {
self->copy_frames = FALSE;
}
return GST_FLOW_OK;
}
static gboolean
gst_v4l2_codec_mpeg2_dec_ensure_bitstream (GstV4l2CodecMpeg2Dec * self)
{
if (self->bitstream)
goto done;
self->bitstream = gst_v4l2_codec_allocator_alloc (self->sink_allocator);
if (!self->bitstream) {
GST_ELEMENT_ERROR (self, RESOURCE, NO_SPACE_LEFT,
("Not enough memory to decode mpeg2 stream."), (NULL));
return FALSE;
}
if (!gst_memory_map (self->bitstream, &self->bitstream_map, GST_MAP_WRITE)) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Could not access bitstream memory for writing"), (NULL));
g_clear_pointer (&self->bitstream, gst_memory_unref);
return FALSE;
}
done:
/* We use this field to track how much we have written */
self->bitstream_map.size = 0;
return TRUE;
}
static inline void
_parse_picture_coding_type (struct v4l2_ctrl_mpeg2_picture *v4l2_picture,
GstMpeg2Picture * mpeg2_picture)
{
switch (mpeg2_picture->type) {
case GST_MPEG_VIDEO_PICTURE_TYPE_I:
v4l2_picture->picture_coding_type = V4L2_MPEG2_PIC_CODING_TYPE_I;
break;
case GST_MPEG_VIDEO_PICTURE_TYPE_P:
v4l2_picture->picture_coding_type = V4L2_MPEG2_PIC_CODING_TYPE_P;
break;
case GST_MPEG_VIDEO_PICTURE_TYPE_B:
v4l2_picture->picture_coding_type = V4L2_MPEG2_PIC_CODING_TYPE_B;
break;
case GST_MPEG_VIDEO_PICTURE_TYPE_D:
v4l2_picture->picture_coding_type = V4L2_MPEG2_PIC_CODING_TYPE_D;
break;
}
}
static inline void
_parse_picture_structure (struct v4l2_ctrl_mpeg2_picture *v4l2_picture,
GstMpeg2Slice * slice)
{
if (!slice->pic_ext)
return;
switch (slice->pic_ext->picture_structure) {
case GST_MPEG_VIDEO_PICTURE_STRUCTURE_TOP_FIELD:
v4l2_picture->picture_structure = V4L2_MPEG2_PIC_TOP_FIELD;
break;
case GST_MPEG_VIDEO_PICTURE_STRUCTURE_BOTTOM_FIELD:
v4l2_picture->picture_structure = V4L2_MPEG2_PIC_BOTTOM_FIELD;
break;
case GST_MPEG_VIDEO_PICTURE_STRUCTURE_FRAME:
v4l2_picture->picture_structure = V4L2_MPEG2_PIC_FRAME;
break;
}
}
static GstFlowReturn
gst_v4l2_codec_mpeg2_dec_start_picture (GstMpeg2Decoder * decoder,
GstMpeg2Picture * picture, GstMpeg2Slice * slice,
GstMpeg2Picture * prev_picture, GstMpeg2Picture * next_picture)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (decoder);
/* FIXME base class should not call us if negotiation failed */
if (!self->sink_allocator)
return GST_FLOW_ERROR;
if (!gst_v4l2_codec_mpeg2_dec_ensure_bitstream (self))
return GST_FLOW_ERROR;
/* *INDENT-OFF* */
self->v4l2_picture = (struct v4l2_ctrl_mpeg2_picture) {
.backward_ref_ts = next_picture ? next_picture->system_frame_number * 1000 : GST_CLOCK_TIME_NONE,
.forward_ref_ts = prev_picture ? prev_picture->system_frame_number * 1000 : GST_CLOCK_TIME_NONE,
.intra_dc_precision = slice->pic_ext ? slice->pic_ext->intra_dc_precision : 0,
.flags = (slice->pic_ext && slice->pic_ext->top_field_first ? V4L2_MPEG2_PIC_FLAG_TOP_FIELD_FIRST : 0) |
(slice->pic_ext && slice->pic_ext->frame_pred_frame_dct ? V4L2_MPEG2_PIC_FLAG_FRAME_PRED_DCT : 0 ) |
(slice->pic_ext && slice->pic_ext->concealment_motion_vectors ? V4L2_MPEG2_PIC_FLAG_CONCEALMENT_MV : 0) |
(slice->pic_ext && slice->pic_ext->q_scale_type ? V4L2_MPEG2_PIC_FLAG_Q_SCALE_TYPE : 0) |
(slice->pic_ext && slice->pic_ext->intra_vlc_format ? V4L2_MPEG2_PIC_FLAG_INTRA_VLC : 0) |
(slice->pic_ext && slice->pic_ext->alternate_scan ? V4L2_MPEG2_PIC_FLAG_ALT_SCAN : 0) |
(slice->pic_ext && slice->pic_ext->repeat_first_field ? V4L2_MPEG2_PIC_FLAG_REPEAT_FIRST : 0) |
(slice->pic_ext && slice->pic_ext->progressive_frame ? V4L2_MPEG2_PIC_FLAG_PROGRESSIVE : 0),
};
/* *INDENT-ON* */
_parse_picture_coding_type (&self->v4l2_picture, picture);
_parse_picture_structure (&self->v4l2_picture, slice);
/* slices share pic_ext and quant_matrix for the picture which might be there or not */
if (slice->pic_ext)
memcpy (&self->v4l2_picture.f_code, slice->pic_ext->f_code,
sizeof (self->v4l2_picture.f_code));
/* overwrite the sequence ones if needed, see 6.1.1.6 for reference */
if (slice->quant_matrix) {
if (slice->quant_matrix->load_intra_quantiser_matrix)
memcpy (self->v4l2_quantisation.intra_quantiser_matrix,
slice->quant_matrix->intra_quantiser_matrix,
sizeof (self->v4l2_quantisation.intra_quantiser_matrix));
if (slice->quant_matrix->load_non_intra_quantiser_matrix)
memcpy (self->v4l2_quantisation.non_intra_quantiser_matrix,
slice->quant_matrix->non_intra_quantiser_matrix,
sizeof (self->v4l2_quantisation.non_intra_quantiser_matrix));
if (slice->quant_matrix->load_chroma_intra_quantiser_matrix)
memcpy (self->v4l2_quantisation.chroma_intra_quantiser_matrix,
slice->quant_matrix->chroma_intra_quantiser_matrix,
sizeof (self->v4l2_quantisation.chroma_intra_quantiser_matrix));
if (slice->quant_matrix->load_chroma_non_intra_quantiser_matrix)
memcpy (self->v4l2_quantisation.chroma_non_intra_quantiser_matrix,
slice->quant_matrix->chroma_non_intra_quantiser_matrix,
sizeof (self->v4l2_quantisation.chroma_non_intra_quantiser_matrix));
self->need_quantiser |= (slice->quant_matrix->load_intra_quantiser_matrix ||
slice->quant_matrix->load_non_intra_quantiser_matrix ||
slice->quant_matrix->load_chroma_intra_quantiser_matrix ||
slice->quant_matrix->load_chroma_non_intra_quantiser_matrix);
}
return GST_FLOW_OK;
}
static gboolean
gst_v4l2_codec_mpeg2_dec_copy_output_buffer (GstV4l2CodecMpeg2Dec * self,
GstVideoCodecFrame * codec_frame)
{
GstVideoFrame src_frame;
GstVideoFrame dest_frame;
GstVideoInfo dest_vinfo;
GstBuffer *buffer;
gst_video_info_set_format (&dest_vinfo, GST_VIDEO_INFO_FORMAT (&self->vinfo),
self->width, self->height);
buffer = gst_video_decoder_allocate_output_buffer (GST_VIDEO_DECODER (self));
if (!buffer)
goto fail;
if (!gst_video_frame_map (&src_frame, &self->vinfo,
codec_frame->output_buffer, GST_MAP_READ))
goto fail;
if (!gst_video_frame_map (&dest_frame, &dest_vinfo, buffer, GST_MAP_WRITE)) {
gst_video_frame_unmap (&dest_frame);
goto fail;
}
GST_VIDEO_INFO_WIDTH (&src_frame.info) = self->width;
GST_VIDEO_INFO_HEIGHT (&src_frame.info) = self->height;
if (!gst_video_frame_copy (&dest_frame, &src_frame)) {
gst_video_frame_unmap (&src_frame);
gst_video_frame_unmap (&dest_frame);
goto fail;
}
gst_video_frame_unmap (&src_frame);
gst_video_frame_unmap (&dest_frame);
gst_buffer_replace (&codec_frame->output_buffer, buffer);
gst_buffer_unref (buffer);
return TRUE;
fail:
GST_ERROR_OBJECT (self, "Failed copy output buffer.");
return FALSE;
}
static GstFlowReturn
gst_v4l2_codec_mpeg2_dec_output_picture (GstMpeg2Decoder * decoder,
GstVideoCodecFrame * frame, GstMpeg2Picture * picture)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (decoder);
GstVideoDecoder *vdec = GST_VIDEO_DECODER (decoder);
GstV4l2Request *request = gst_mpeg2_picture_get_user_data (picture);
gint ret;
GST_DEBUG_OBJECT (self, "Output picture %u", picture->system_frame_number);
ret = gst_v4l2_request_set_done (request);
if (ret == 0) {
GST_ELEMENT_ERROR (self, STREAM, DECODE,
("Decoding frame %u took too long", picture->system_frame_number),
(NULL));
goto error;
} else if (ret < 0) {
GST_ELEMENT_ERROR (self, STREAM, DECODE,
("Decoding request failed: %s", g_strerror (errno)), (NULL));
goto error;
}
g_return_val_if_fail (frame->output_buffer, GST_FLOW_ERROR);
if (gst_v4l2_request_failed (request)) {
GST_ELEMENT_ERROR (self, STREAM, DECODE,
("Failed to decode frame %u", picture->system_frame_number), (NULL));
goto error;
}
/* Hold on reference buffers for the rest of the picture lifetime */
gst_mpeg2_picture_set_user_data (picture,
gst_buffer_ref (frame->output_buffer), (GDestroyNotify) gst_buffer_unref);
if (self->copy_frames)
gst_v4l2_codec_mpeg2_dec_copy_output_buffer (self, frame);
gst_mpeg2_picture_unref (picture);
return gst_video_decoder_finish_frame (vdec, frame);
error:
gst_video_decoder_drop_frame (vdec, frame);
gst_mpeg2_picture_unref (picture);
return GST_FLOW_ERROR;
}
static void
gst_v4l2_codec_mpeg2_dec_reset_picture (GstV4l2CodecMpeg2Dec * self)
{
if (self->bitstream) {
if (self->bitstream_map.memory)
gst_memory_unmap (self->bitstream, &self->bitstream_map);
g_clear_pointer (&self->bitstream, gst_memory_unref);
self->bitstream_map = (GstMapInfo) GST_MAP_INFO_INIT;
}
}
static gboolean
gst_v4l2_codec_mpeg2_dec_ensure_output_buffer (GstV4l2CodecMpeg2Dec * self,
GstVideoCodecFrame * frame)
{
GstBuffer *buffer;
GstFlowReturn flow_ret;
if (frame->output_buffer)
return TRUE;
flow_ret = gst_buffer_pool_acquire_buffer (GST_BUFFER_POOL (self->src_pool),
&buffer, NULL);
if (flow_ret != GST_FLOW_OK) {
if (flow_ret == GST_FLOW_FLUSHING)
GST_DEBUG_OBJECT (self, "Frame decoding aborted, we are flushing.");
else
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("No more picture buffer available."), (NULL));
return FALSE;
}
frame->output_buffer = buffer;
return TRUE;
}
static gboolean
gst_v4l2_codec_mpeg2_dec_submit_bitstream (GstV4l2CodecMpeg2Dec * self,
GstMpeg2Picture * picture)
{
GstV4l2Request *prev_request = NULL, *request = NULL;
gsize bytesused;
gboolean ret = FALSE;
guint count = 0;
guint flags = 0;
/* *INDENT-OFF* */
/* Reserve space for controls */
struct v4l2_ext_control control[] = {
{ }, /* sequence */
{ }, /* picture */
{ }, /* slice */
{ }, /* quantization */
};
/* *INDENT-ON* */
if (picture->structure != GST_MPEG_VIDEO_PICTURE_STRUCTURE_FRAME) {
if (picture->first_field)
prev_request = gst_mpeg2_picture_get_user_data (picture->first_field);
else
flags = V4L2_BUF_FLAG_M2M_HOLD_CAPTURE_BUF;
}
bytesused = self->bitstream_map.size;
gst_memory_unmap (self->bitstream, &self->bitstream_map);
self->bitstream_map = (GstMapInfo) GST_MAP_INFO_INIT;
gst_memory_resize (self->bitstream, 0, bytesused);
if (prev_request) {
request = gst_v4l2_decoder_alloc_sub_request (self->decoder, prev_request,
self->bitstream);
} else {
GstVideoCodecFrame *frame;
frame = gst_video_decoder_get_frame (GST_VIDEO_DECODER (self),
picture->system_frame_number);
g_return_val_if_fail (frame, FALSE);
if (!gst_v4l2_codec_mpeg2_dec_ensure_output_buffer (self, frame))
goto done;
request = gst_v4l2_decoder_alloc_request (self->decoder,
picture->system_frame_number, self->bitstream, frame->output_buffer);
gst_video_codec_frame_unref (frame);
}
if (!request) {
GST_ELEMENT_ERROR (self, RESOURCE, NO_SPACE_LEFT,
("Failed to allocate a media request object."), (NULL));
goto done;
}
if (self->need_sequence) {
control[count].id = V4L2_CID_STATELESS_MPEG2_SEQUENCE;
control[count].ptr = &self->v4l2_sequence;
control[count].size = sizeof (self->v4l2_sequence);
count++;
self->need_sequence = FALSE;
}
control[count].id = V4L2_CID_STATELESS_MPEG2_PICTURE;
control[count].ptr = &self->v4l2_picture;
control[count].size = sizeof (self->v4l2_picture);
count++;
if (self->need_quantiser) {
control[count].id = V4L2_CID_STATELESS_MPEG2_QUANTISATION;
control[count].ptr = &self->v4l2_quantisation;
control[count].size = sizeof (self->v4l2_quantisation);
count++;
self->need_quantiser = FALSE;
}
if (!gst_v4l2_decoder_set_controls (self->decoder, request, control, count)) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Driver did not accept the bitstream parameters."), (NULL));
goto done;
}
if (!gst_v4l2_request_queue (request, flags)) {
GST_ELEMENT_ERROR (self, RESOURCE, WRITE,
("Driver did not accept the decode request."), (NULL));
goto done;
}
gst_mpeg2_picture_set_user_data (picture, g_steal_pointer (&request),
(GDestroyNotify) gst_v4l2_request_unref);
ret = TRUE;
done:
if (request)
gst_v4l2_request_unref (request);
gst_v4l2_codec_mpeg2_dec_reset_picture (self);
return ret;
}
static GstFlowReturn
gst_v4l2_codec_mpeg2_dec_decode_slice (GstMpeg2Decoder * decoder,
GstMpeg2Picture * picture, GstMpeg2Slice * slice)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (decoder);
const gsize slice_size = slice->size;
const gsize slice_offset = slice->sc_offset;
const guint8 *slice_ptr = slice->packet.data + slice_offset;
guint8 *bitstream_ptr = self->bitstream_map.data + self->bitstream_map.size;
if (self->bitstream_map.size + slice_size > self->bitstream_map.maxsize) {
GST_ELEMENT_ERROR (decoder, RESOURCE, NO_SPACE_LEFT,
("Not enough space for slice."), (NULL));
gst_v4l2_codec_mpeg2_dec_reset_picture (self);
return GST_FLOW_ERROR;
}
memcpy (bitstream_ptr, slice_ptr, slice_size);
self->bitstream_map.size += slice_size;
return GST_FLOW_OK;
}
static GstFlowReturn
gst_v4l2_codec_mpeg2_dec_end_picture (GstMpeg2Decoder * decoder,
GstMpeg2Picture * picture)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (decoder);
/* FIXME might need to make this lazier in case we get an unpaired field */
if (!gst_v4l2_codec_mpeg2_dec_submit_bitstream (self, picture))
return GST_FLOW_ERROR;
return GST_FLOW_OK;
}
static void
gst_v4l2_codec_mpeg2_dec_set_flushing (GstV4l2CodecMpeg2Dec * self,
gboolean flushing)
{
if (self->sink_allocator)
gst_v4l2_codec_allocator_set_flushing (self->sink_allocator, flushing);
if (self->src_allocator)
gst_v4l2_codec_allocator_set_flushing (self->src_allocator, flushing);
}
static gboolean
gst_v4l2_codec_mpeg2_dec_flush (GstVideoDecoder * decoder)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (decoder);
GST_DEBUG_OBJECT (self, "Flushing decoder state.");
gst_v4l2_decoder_flush (self->decoder);
gst_v4l2_codec_mpeg2_dec_set_flushing (self, FALSE);
return GST_VIDEO_DECODER_CLASS (parent_class)->flush (decoder);
}
static gboolean
gst_v4l2_codec_mpeg2_dec_sink_event (GstVideoDecoder * decoder,
GstEvent * event)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (decoder);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_START:
GST_DEBUG_OBJECT (self, "flush start");
gst_v4l2_codec_mpeg2_dec_set_flushing (self, TRUE);
break;
default:
break;
}
return GST_VIDEO_DECODER_CLASS (parent_class)->sink_event (decoder, event);
}
static GstStateChangeReturn
gst_v4l2_codec_mpeg2_dec_change_state (GstElement * element,
GstStateChange transition)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (element);
if (transition == GST_STATE_CHANGE_PAUSED_TO_READY)
gst_v4l2_codec_mpeg2_dec_set_flushing (self, TRUE);
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
}
static void
gst_v4l2_codec_mpeg2_dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (object);
GObject *dec = G_OBJECT (self->decoder);
switch (prop_id) {
default:
gst_v4l2_decoder_set_property (dec, prop_id - PROP_LAST, value, pspec);
break;
}
}
static void
gst_v4l2_codec_mpeg2_dec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (object);
GObject *dec = G_OBJECT (self->decoder);
switch (prop_id) {
default:
gst_v4l2_decoder_get_property (dec, prop_id - PROP_LAST, value, pspec);
break;
}
}
static void
gst_v4l2_codec_mpeg2_dec_init (GstV4l2CodecMpeg2Dec * self)
{
}
static void
gst_v4l2_codec_mpeg2_dec_subinit (GstV4l2CodecMpeg2Dec * self,
GstV4l2CodecMpeg2DecClass * klass)
{
self->decoder = gst_v4l2_decoder_new (klass->device);
gst_video_info_init (&self->vinfo);
}
static void
gst_v4l2_codec_mpeg2_dec_dispose (GObject * object)
{
GstV4l2CodecMpeg2Dec *self = GST_V4L2_CODEC_MPEG2_DEC (object);
g_clear_object (&self->decoder);
G_OBJECT_CLASS (parent_class)->dispose (object);
}
static void
gst_v4l2_codec_mpeg2_dec_class_init (GstV4l2CodecMpeg2DecClass * klass)
{
}
static void
gst_v4l2_codec_mpeg2_dec_subclass_init (GstV4l2CodecMpeg2DecClass * klass,
GstV4l2CodecDevice * device)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_CLASS (klass);
GstMpeg2DecoderClass *mpeg2decoder_class = GST_MPEG2_DECODER_CLASS (klass);
gobject_class->set_property = gst_v4l2_codec_mpeg2_dec_set_property;
gobject_class->get_property = gst_v4l2_codec_mpeg2_dec_get_property;
gobject_class->dispose = gst_v4l2_codec_mpeg2_dec_dispose;
gst_element_class_set_static_metadata (element_class,
"V4L2 Stateless Mpeg2 Video Decoder",
"Codec/Decoder/Video/Hardware",
"A V4L2 based Mpeg2 video decoder",
"Daniel Almeida <daniel.almeida@collabora.com>");
gst_element_class_add_static_pad_template (element_class, &sink_template);
gst_element_class_add_static_pad_template (element_class, &src_template);
element_class->change_state =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_change_state);
decoder_class->open = GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_open);
decoder_class->close = GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_close);
decoder_class->stop = GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_stop);
decoder_class->negotiate =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_negotiate);
decoder_class->decide_allocation =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_decide_allocation);
decoder_class->flush = GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_flush);
decoder_class->sink_event =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_sink_event);
mpeg2decoder_class->new_sequence =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_new_sequence);
mpeg2decoder_class->output_picture =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_output_picture);
mpeg2decoder_class->start_picture =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_start_picture);
mpeg2decoder_class->decode_slice =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_decode_slice);
mpeg2decoder_class->end_picture =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_end_picture);
mpeg2decoder_class->get_preferred_output_delay =
GST_DEBUG_FUNCPTR (gst_v4l2_codec_mpeg2_dec_get_preferred_output_delay);
klass->device = device;
gst_v4l2_decoder_install_properties (gobject_class, PROP_LAST, device);
}
void
gst_v4l2_codec_mpeg2_dec_register (GstPlugin * plugin, GstV4l2Decoder * decoder,
GstV4l2CodecDevice * device, guint rank)
{
GstCaps *src_caps;
if (!gst_v4l2_decoder_set_sink_fmt (decoder, V4L2_PIX_FMT_MPEG2_SLICE,
320, 240, 8))
return;
src_caps = gst_v4l2_decoder_enum_src_formats (decoder);
if (gst_caps_is_empty (src_caps)) {
GST_WARNING ("Not registering MPEG2 decoder since it produces no "
"supported format");
goto done;
}
gst_v4l2_decoder_register (plugin, GST_TYPE_V4L2_CODEC_MPEG2_DEC,
(GClassInitFunc) gst_v4l2_codec_mpeg2_dec_subclass_init,
gst_mini_object_ref (GST_MINI_OBJECT (device)),
(GInstanceInitFunc) gst_v4l2_codec_mpeg2_dec_subinit,
"v4l2sl%smpeg2dec", device, rank, NULL);
done:
gst_caps_unref (src_caps);
}