gstreamer/subprojects/gst-plugins-bad/gst-libs/gst/codecs/gstvp8decoder.c

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/* GStreamer
* Copyright (C) 2020 Seungha Yang <seungha@centricular.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.
*/
/**
* SECTION:gstvp8decoder
* @title: GstVp8Decoder
* @short_description: Base class to implement stateless VP8 decoders
* @sources:
* - gstvp8picture.h
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <gst/base/base.h>
#include "gstvp8decoder.h"
GST_DEBUG_CATEGORY (gst_vp8_decoder_debug);
#define GST_CAT_DEFAULT gst_vp8_decoder_debug
struct _GstVp8DecoderPrivate
{
gint width;
gint height;
gboolean had_sequence;
GstVp8Parser parser;
gboolean wait_keyframe;
guint preferred_output_delay;
/* for delayed output */
GstQueueArray *output_queue;
gboolean is_live;
gboolean input_state_changed;
};
typedef struct
{
GstVideoCodecFrame *frame;
GstVp8Picture *picture;
GstVp8Decoder *self;
} GstVp8DecoderOutputFrame;
#define parent_class gst_vp8_decoder_parent_class
G_DEFINE_ABSTRACT_TYPE_WITH_CODE (GstVp8Decoder, gst_vp8_decoder,
GST_TYPE_VIDEO_DECODER,
G_ADD_PRIVATE (GstVp8Decoder);
GST_DEBUG_CATEGORY_INIT (gst_vp8_decoder_debug, "vp8decoder", 0,
"VP8 Video Decoder"));
static gboolean gst_vp8_decoder_start (GstVideoDecoder * decoder);
static gboolean gst_vp8_decoder_stop (GstVideoDecoder * decoder);
static gboolean gst_vp8_decoder_set_format (GstVideoDecoder * decoder,
GstVideoCodecState * state);
static gboolean gst_vp8_decoder_negotiate (GstVideoDecoder * decoder);
static GstFlowReturn gst_vp8_decoder_finish (GstVideoDecoder * decoder);
static gboolean gst_vp8_decoder_flush (GstVideoDecoder * decoder);
static GstFlowReturn gst_vp8_decoder_drain (GstVideoDecoder * decoder);
static GstFlowReturn gst_vp8_decoder_handle_frame (GstVideoDecoder * decoder,
GstVideoCodecFrame * frame);
static void gst_vp8_decoder_clear_output_frame (GstVp8DecoderOutputFrame *
output_frame);
static void gst_vp8_decoder_drain_output_queue (GstVp8Decoder * self,
guint num, GstFlowReturn * ret);
static GstFlowReturn gst_vp8_decoder_drain_internal (GstVp8Decoder * self,
gboolean wait_keyframe);
static void
gst_vp8_decoder_class_init (GstVp8DecoderClass * klass)
{
GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_CLASS (klass);
decoder_class->start = GST_DEBUG_FUNCPTR (gst_vp8_decoder_start);
decoder_class->stop = GST_DEBUG_FUNCPTR (gst_vp8_decoder_stop);
decoder_class->set_format = GST_DEBUG_FUNCPTR (gst_vp8_decoder_set_format);
decoder_class->negotiate = GST_DEBUG_FUNCPTR (gst_vp8_decoder_negotiate);
decoder_class->finish = GST_DEBUG_FUNCPTR (gst_vp8_decoder_finish);
decoder_class->flush = GST_DEBUG_FUNCPTR (gst_vp8_decoder_flush);
decoder_class->drain = GST_DEBUG_FUNCPTR (gst_vp8_decoder_drain);
decoder_class->handle_frame =
GST_DEBUG_FUNCPTR (gst_vp8_decoder_handle_frame);
}
static void
gst_vp8_decoder_init (GstVp8Decoder * self)
{
gst_video_decoder_set_packetized (GST_VIDEO_DECODER (self), TRUE);
gst_video_decoder_set_needs_format (GST_VIDEO_DECODER (self), TRUE);
self->priv = gst_vp8_decoder_get_instance_private (self);
}
static gboolean
gst_vp8_decoder_start (GstVideoDecoder * decoder)
{
GstVp8Decoder *self = GST_VP8_DECODER (decoder);
GstVp8DecoderPrivate *priv = self->priv;
gst_vp8_parser_init (&priv->parser);
priv->wait_keyframe = TRUE;
priv->output_queue =
gst_queue_array_new_for_struct (sizeof (GstVp8DecoderOutputFrame), 1);
gst_queue_array_set_clear_func (priv->output_queue,
(GDestroyNotify) gst_vp8_decoder_clear_output_frame);
return TRUE;
}
static void
gst_vp8_decoder_reset (GstVp8Decoder * self)
{
GstVp8DecoderPrivate *priv = self->priv;
gst_clear_vp8_picture (&self->last_picture);
gst_clear_vp8_picture (&self->golden_ref_picture);
gst_clear_vp8_picture (&self->alt_ref_picture);
priv->wait_keyframe = TRUE;
gst_queue_array_clear (priv->output_queue);
}
static gboolean
gst_vp8_decoder_stop (GstVideoDecoder * decoder)
{
GstVp8Decoder *self = GST_VP8_DECODER (decoder);
GstVp8DecoderPrivate *priv = self->priv;
if (self->input_state) {
gst_video_codec_state_unref (self->input_state);
self->input_state = NULL;
}
gst_vp8_decoder_reset (self);
gst_queue_array_free (priv->output_queue);
return TRUE;
}
static GstFlowReturn
gst_vp8_decoder_check_codec_change (GstVp8Decoder * self,
const GstVp8FrameHdr * frame_hdr)
{
GstVp8DecoderPrivate *priv = self->priv;
GstFlowReturn ret = GST_FLOW_OK;
gboolean changed = FALSE;
if (priv->width != frame_hdr->width || priv->height != frame_hdr->height) {
GST_INFO_OBJECT (self, "resolution changed %dx%d", frame_hdr->width,
frame_hdr->height);
priv->width = frame_hdr->width;
priv->height = frame_hdr->height;
changed = TRUE;
}
if (changed || !priv->had_sequence) {
GstVp8DecoderClass *klass = GST_VP8_DECODER_GET_CLASS (self);
/* Drain before new sequence */
ret = gst_vp8_decoder_drain_internal (self, FALSE);
if (ret != GST_FLOW_OK) {
GST_WARNING_OBJECT (self, "Failed to drain pending frames, returned %s",
gst_flow_get_name (ret));
return ret;
}
priv->had_sequence = TRUE;
if (klass->get_preferred_output_delay) {
priv->preferred_output_delay =
klass->get_preferred_output_delay (self, priv->is_live);
} else {
priv->preferred_output_delay = 0;
}
g_assert (klass->new_sequence);
ret = klass->new_sequence (self, frame_hdr,
/* last/golden/alt 3 reference pictures + current picture */
4 + priv->preferred_output_delay);
}
return ret;
}
static gboolean
gst_vp8_decoder_set_format (GstVideoDecoder * decoder,
GstVideoCodecState * state)
{
GstVp8Decoder *self = GST_VP8_DECODER (decoder);
GstVp8DecoderPrivate *priv = self->priv;
GstQuery *query;
GST_DEBUG_OBJECT (decoder, "Set format");
priv->input_state_changed = TRUE;
if (self->input_state)
gst_video_codec_state_unref (self->input_state);
self->input_state = gst_video_codec_state_ref (state);
priv->width = GST_VIDEO_INFO_WIDTH (&state->info);
priv->height = GST_VIDEO_INFO_HEIGHT (&state->info);
query = gst_query_new_latency ();
if (gst_pad_peer_query (GST_VIDEO_DECODER_SINK_PAD (self), query))
gst_query_parse_latency (query, &priv->is_live, NULL, NULL);
gst_query_unref (query);
return TRUE;
}
static gboolean
gst_vp8_decoder_negotiate (GstVideoDecoder * decoder)
{
GstVp8Decoder *self = GST_VP8_DECODER (decoder);
/* output state must be updated by subclass using new input state already */
self->priv->input_state_changed = FALSE;
return GST_VIDEO_DECODER_CLASS (parent_class)->negotiate (decoder);
}
static gboolean
gst_vp8_decoder_update_reference (GstVp8Decoder * self, GstVp8Picture * picture)
{
GstVp8FrameHdr *frame_hdr = &picture->frame_hdr;
if (frame_hdr->key_frame) {
gst_vp8_picture_replace (&self->last_picture, picture);
gst_vp8_picture_replace (&self->golden_ref_picture, picture);
gst_vp8_picture_replace (&self->alt_ref_picture, picture);
goto done;
}
if (frame_hdr->refresh_alternate_frame) {
gst_vp8_picture_replace (&self->alt_ref_picture, picture);
} else {
switch (frame_hdr->copy_buffer_to_alternate) {
case 0:
/* do nothing */
break;
case 1:
gst_vp8_picture_replace (&self->alt_ref_picture, self->last_picture);
break;
case 2:
gst_vp8_picture_replace (&self->alt_ref_picture,
self->golden_ref_picture);
break;
default:
GST_WARNING_OBJECT (self, "unrecognized copy_buffer_to_alternate %d",
frame_hdr->copy_buffer_to_alternate);
break;
}
}
if (frame_hdr->refresh_golden_frame) {
gst_vp8_picture_replace (&self->golden_ref_picture, picture);
} else {
switch (frame_hdr->copy_buffer_to_golden) {
case 0:
/* do nothing */
break;
case 1:
gst_vp8_picture_replace (&self->golden_ref_picture, self->last_picture);
break;
case 2:
gst_vp8_picture_replace (&self->golden_ref_picture,
self->alt_ref_picture);
break;
default:
GST_WARNING_OBJECT (self, "unrecognized copy_buffer_to_golden %d",
frame_hdr->copy_buffer_to_alternate);
break;
}
}
if (frame_hdr->refresh_last)
gst_vp8_picture_replace (&self->last_picture, picture);
done:
gst_vp8_picture_unref (picture);
return TRUE;
}
static GstFlowReturn
gst_vp8_decoder_drain_internal (GstVp8Decoder * self, gboolean wait_keyframe)
{
GstFlowReturn ret = GST_FLOW_OK;
GstVp8DecoderPrivate *priv = self->priv;
gst_vp8_decoder_drain_output_queue (self, 0, &ret);
gst_clear_vp8_picture (&self->last_picture);
gst_clear_vp8_picture (&self->golden_ref_picture);
gst_clear_vp8_picture (&self->alt_ref_picture);
priv->wait_keyframe = wait_keyframe;
return ret;
}
static GstFlowReturn
gst_vp8_decoder_finish (GstVideoDecoder * decoder)
{
GST_DEBUG_OBJECT (decoder, "finish");
return gst_vp8_decoder_drain_internal (GST_VP8_DECODER (decoder), TRUE);
}
static gboolean
gst_vp8_decoder_flush (GstVideoDecoder * decoder)
{
GstVp8Decoder *self = GST_VP8_DECODER (decoder);
GST_DEBUG_OBJECT (self, "flush");
gst_vp8_decoder_reset (self);
return TRUE;
}
static GstFlowReturn
gst_vp8_decoder_drain (GstVideoDecoder * decoder)
{
GST_DEBUG_OBJECT (decoder, "drain");
return gst_vp8_decoder_drain_internal (GST_VP8_DECODER (decoder), TRUE);
}
static void
gst_vp8_decoder_clear_output_frame (GstVp8DecoderOutputFrame * output_frame)
{
if (!output_frame)
return;
if (output_frame->frame) {
gst_video_decoder_release_frame (GST_VIDEO_DECODER (output_frame->self),
output_frame->frame);
output_frame->frame = NULL;
}
gst_clear_vp8_picture (&output_frame->picture);
}
static GstFlowReturn
gst_vp8_decoder_handle_frame (GstVideoDecoder * decoder,
GstVideoCodecFrame * frame)
{
GstVp8Decoder *self = GST_VP8_DECODER (decoder);
GstVp8DecoderClass *klass = GST_VP8_DECODER_GET_CLASS (self);
GstVp8DecoderPrivate *priv = self->priv;
GstBuffer *in_buf = frame->input_buffer;
GstMapInfo map;
GstVp8FrameHdr frame_hdr;
GstVp8ParserResult pres;
GstVp8Picture *picture = NULL;
GstFlowReturn ret = GST_FLOW_OK;
GstVp8DecoderOutputFrame output_frame;
GST_LOG_OBJECT (self,
"handle frame, PTS: %" GST_TIME_FORMAT ", DTS: %"
GST_TIME_FORMAT, GST_TIME_ARGS (GST_BUFFER_PTS (in_buf)),
GST_TIME_ARGS (GST_BUFFER_DTS (in_buf)));
if (!gst_buffer_map (in_buf, &map, GST_MAP_READ)) {
GST_ERROR_OBJECT (self, "Cannot map buffer");
ret = GST_FLOW_ERROR;
goto error;
}
pres = gst_vp8_parser_parse_frame_header (&priv->parser,
&frame_hdr, map.data, map.size);
if (pres != GST_VP8_PARSER_OK) {
GST_ERROR_OBJECT (self, "Cannot parser frame header");
ret = GST_FLOW_ERROR;
goto unmap_and_error;
}
if (priv->wait_keyframe) {
if (!frame_hdr.key_frame) {
GST_DEBUG_OBJECT (self, "Waiting initial keyframe, drop buffer %"
GST_PTR_FORMAT, in_buf);
gst_buffer_unmap (in_buf, &map);
gst_video_decoder_drop_frame (decoder, frame);
return GST_FLOW_OK;
}
}
priv->wait_keyframe = FALSE;
if (frame_hdr.key_frame) {
ret = gst_vp8_decoder_check_codec_change (self, &frame_hdr);
if (ret != GST_FLOW_OK) {
GST_WARNING_OBJECT (self, "Subclass cannot handle codec change");
goto unmap_and_error;
}
}
picture = gst_vp8_picture_new ();
picture->frame_hdr = frame_hdr;
picture->pts = GST_BUFFER_PTS (in_buf);
picture->data = map.data;
picture->size = map.size;
picture->system_frame_number = frame->system_frame_number;
if (klass->new_picture) {
ret = klass->new_picture (self, frame, picture);
if (ret != GST_FLOW_OK) {
GST_WARNING_OBJECT (self, "subclass failed to handle new picture");
goto unmap_and_error;
}
}
if (klass->start_picture) {
ret = klass->start_picture (self, picture);
if (ret != GST_FLOW_OK) {
GST_WARNING_OBJECT (self, "subclass failed to handle start picture");
goto unmap_and_error;
}
}
if (klass->decode_picture) {
ret = klass->decode_picture (self, picture, &priv->parser);
if (ret != GST_FLOW_OK) {
GST_WARNING_OBJECT (self, "subclass failed to decode current picture");
goto unmap_and_error;
}
}
if (klass->end_picture) {
ret = klass->end_picture (self, picture);
if (ret != GST_FLOW_OK) {
GST_WARNING_OBJECT (self, "subclass failed to handle end picture");
goto unmap_and_error;
}
}
gst_buffer_unmap (in_buf, &map);
gst_vp8_decoder_update_reference (self, gst_vp8_picture_ref (picture));
if (!picture->frame_hdr.show_frame) {
GST_LOG_OBJECT (self, "Decode only picture %p", picture);
GST_VIDEO_CODEC_FRAME_SET_DECODE_ONLY (frame);
gst_vp8_picture_unref (picture);
ret = gst_video_decoder_finish_frame (GST_VIDEO_DECODER (self), frame);
} else {
/* If subclass didn't update output state at this point,
* marking this picture as a discont and stores current input state */
if (priv->input_state_changed) {
picture->discont_state = gst_video_codec_state_ref (self->input_state);
priv->input_state_changed = FALSE;
}
output_frame.frame = frame;
output_frame.picture = picture;
output_frame.self = self;
gst_queue_array_push_tail_struct (priv->output_queue, &output_frame);
}
gst_vp8_decoder_drain_output_queue (self, priv->preferred_output_delay, &ret);
if (ret == GST_FLOW_ERROR) {
GST_VIDEO_DECODER_ERROR (self, 1, STREAM, DECODE,
("Failed to decode data"), (NULL), ret);
return ret;
}
return ret;
unmap_and_error:
{
gst_buffer_unmap (in_buf, &map);
goto error;
}
error:
{
if (picture)
gst_vp8_picture_unref (picture);
if (ret == GST_FLOW_ERROR) {
GST_VIDEO_DECODER_ERROR (self, 1, STREAM, DECODE,
("Failed to decode data"), (NULL), ret);
}
gst_video_decoder_drop_frame (decoder, frame);
return ret;
}
}
static void
gst_vp8_decoder_drain_output_queue (GstVp8Decoder * self, guint num,
GstFlowReturn * ret)
{
GstVp8DecoderPrivate *priv = self->priv;
GstVp8DecoderClass *klass = GST_VP8_DECODER_GET_CLASS (self);
g_assert (klass->output_picture);
while (gst_queue_array_get_length (priv->output_queue) > num) {
GstVp8DecoderOutputFrame *output_frame = (GstVp8DecoderOutputFrame *)
gst_queue_array_pop_head_struct (priv->output_queue);
/* Output queued frames whatever the return value is, in order to empty
* the queue */
GstFlowReturn flow_ret = klass->output_picture (self,
output_frame->frame, output_frame->picture);
/* Then, update @ret with new flow return value only if @ret was
* GST_FLOW_OK. This is to avoid pattern such that
* ```c
* GstFlowReturn my_return = GST_FLOW_OK;
* do something
*
* if (my_return == GST_FLOW_OK) {
* my_return = gst_vp8_decoder_drain_output_queue ();
* } else {
* // Ignore flow return of this method, but current `my_return` error code
* gst_vp8_decoder_drain_output_queue ();
* }
*
* return my_return;
* ```
*/
if (*ret == GST_FLOW_OK)
*ret = flow_ret;
}
}