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gstvideodecoder.c
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gstvideodecoder.c
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/* GStreamer
* Copyright (C) 2008 David Schleef <ds@schleef.org>
* Copyright (C) 2011 Mark Nauwelaerts <mark.nauwelaerts@collabora.co.uk>.
* Copyright (C) 2011 Nokia Corporation. All rights reserved.
* Contact: Stefan Kost <stefan.kost@nokia.com>
* Copyright (C) 2012 Collabora Ltd.
* Author : Edward Hervey <edward@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.
*/
/**
* SECTION:gstvideodecoder
* @title: GstVideoDecoder
* @short_description: Base class for video decoders
* @see_also:
*
* This base class is for video decoders turning encoded data into raw video
* frames.
*
* The GstVideoDecoder base class and derived subclasses should cooperate as
* follows:
*
* ## Configuration
*
* * Initially, GstVideoDecoder calls @start when the decoder element
* is activated, which allows the subclass to perform any global setup.
*
* * GstVideoDecoder calls @set_format to inform the subclass of caps
* describing input video data that it is about to receive, including
* possibly configuration data.
* While unlikely, it might be called more than once, if changing input
* parameters require reconfiguration.
*
* * Incoming data buffers are processed as needed, described in Data
* Processing below.
*
* * GstVideoDecoder calls @stop at end of all processing.
*
* ## Data processing
*
* * The base class gathers input data, and optionally allows subclass
* to parse this into subsequently manageable chunks, typically
* corresponding to and referred to as 'frames'.
*
* * Each input frame is provided in turn to the subclass' @handle_frame
* callback.
* The ownership of the frame is given to the @handle_frame callback.
*
* * If codec processing results in decoded data, the subclass should call
* @gst_video_decoder_finish_frame to have decoded data pushed.
* downstream. Otherwise, the subclass must call
* @gst_video_decoder_drop_frame, to allow the base class to do timestamp
* and offset tracking, and possibly to requeue the frame for a later
* attempt in the case of reverse playback.
*
* ## Shutdown phase
*
* * The GstVideoDecoder class calls @stop to inform the subclass that data
* parsing will be stopped.
*
* ## Additional Notes
*
* * Seeking/Flushing
*
* * When the pipeline is seeked or otherwise flushed, the subclass is
* informed via a call to its @reset callback, with the hard parameter
* set to true. This indicates the subclass should drop any internal data
* queues and timestamps and prepare for a fresh set of buffers to arrive
* for parsing and decoding.
*
* * End Of Stream
*
* * At end-of-stream, the subclass @parse function may be called some final
* times with the at_eos parameter set to true, indicating that the element
* should not expect any more data to be arriving, and it should parse and
* remaining frames and call gst_video_decoder_have_frame() if possible.
*
* The subclass is responsible for providing pad template caps for
* source and sink pads. The pads need to be named "sink" and "src". It also
* needs to provide information about the ouptput caps, when they are known.
* This may be when the base class calls the subclass' @set_format function,
* though it might be during decoding, before calling
* @gst_video_decoder_finish_frame. This is done via
* @gst_video_decoder_set_output_state
*
* The subclass is also responsible for providing (presentation) timestamps
* (likely based on corresponding input ones). If that is not applicable
* or possible, the base class provides limited framerate based interpolation.
*
* Similarly, the base class provides some limited (legacy) seeking support
* if specifically requested by the subclass, as full-fledged support
* should rather be left to upstream demuxer, parser or alike. This simple
* approach caters for seeking and duration reporting using estimated input
* bitrates. To enable it, a subclass should call
* @gst_video_decoder_set_estimate_rate to enable handling of incoming
* byte-streams.
*
* The base class provides some support for reverse playback, in particular
* in case incoming data is not packetized or upstream does not provide
* fragments on keyframe boundaries. However, the subclass should then be
* prepared for the parsing and frame processing stage to occur separately
* (in normal forward processing, the latter immediately follows the former),
* The subclass also needs to ensure the parsing stage properly marks
* keyframes, unless it knows the upstream elements will do so properly for
* incoming data.
*
* The bare minimum that a functional subclass needs to implement is:
*
* * Provide pad templates
* * Inform the base class of output caps via
* @gst_video_decoder_set_output_state
*
* * Parse input data, if it is not considered packetized from upstream
* Data will be provided to @parse which should invoke
* @gst_video_decoder_add_to_frame and @gst_video_decoder_have_frame to
* separate the data belonging to each video frame.
*
* * Accept data in @handle_frame and provide decoded results to
* @gst_video_decoder_finish_frame, or call @gst_video_decoder_drop_frame.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
/* TODO
*
* * Add a flag/boolean for I-frame-only/image decoders so we can do extra
* features, like applying QoS on input (as opposed to after the frame is
* decoded).
* * Add a flag/boolean for decoders that require keyframes, so the base
* class can automatically discard non-keyframes before one has arrived
* * Detect reordered frame/timestamps and fix the pts/dts
* * Support for GstIndex (or shall we not care ?)
* * Calculate actual latency based on input/output timestamp/frame_number
* and if it exceeds the recorded one, save it and emit a GST_MESSAGE_LATENCY
* * Emit latency message when it changes
*
*/
/* Implementation notes:
* The Video Decoder base class operates in 2 primary processing modes, depending
* on whether forward or reverse playback is requested.
*
* Forward playback:
* * Incoming buffer -> @parse() -> add_to_frame()/have_frame() ->
* handle_frame() -> push downstream
*
* Reverse playback is more complicated, since it involves gathering incoming
* data regions as we loop backwards through the upstream data. The processing
* concept (using incoming buffers as containing one frame each to simplify
* things) is:
*
* Upstream data we want to play:
* Buffer encoded order: 1 2 3 4 5 6 7 8 9 EOS
* Keyframe flag: K K
* Groupings: AAAAAAA BBBBBBB CCCCCCC
*
* Input:
* Buffer reception order: 7 8 9 4 5 6 1 2 3 EOS
* Keyframe flag: K K
* Discont flag: D D D
*
* - Each Discont marks a discont in the decoding order.
* - The keyframes mark where we can start decoding.
*
* Initially, we prepend incoming buffers to the gather queue. Whenever the
* discont flag is set on an incoming buffer, the gather queue is flushed out
* before the new buffer is collected.
*
* The above data will be accumulated in the gather queue like this:
*
* gather queue: 9 8 7
* D
*
* When buffer 4 is received (with a DISCONT), we flush the gather queue like
* this:
*
* while (gather)
* take head of queue and prepend to parse queue (this reverses the
* sequence, so parse queue is 7 -> 8 -> 9)
*
* Next, we process the parse queue, which now contains all un-parsed packets
* (including any leftover ones from the previous decode section)
*
* for each buffer now in the parse queue:
* Call the subclass parse function, prepending each resulting frame to
* the parse_gather queue. Buffers which precede the first one that
* produces a parsed frame are retained in the parse queue for
* re-processing on the next cycle of parsing.
*
* The parse_gather queue now contains frame objects ready for decoding,
* in reverse order.
* parse_gather: 9 -> 8 -> 7
*
* while (parse_gather)
* Take the head of the queue and prepend it to the decode queue
* If the frame was a keyframe, process the decode queue
* decode is now 7-8-9
*
* Processing the decode queue results in frames with attached output buffers
* stored in the 'output_queue' ready for outputting in reverse order.
*
* After we flushed the gather queue and parsed it, we add 4 to the (now empty)
* gather queue. We get the following situation:
*
* gather queue: 4
* decode queue: 7 8 9
*
* After we received 5 (Keyframe) and 6:
*
* gather queue: 6 5 4
* decode queue: 7 8 9
*
* When we receive 1 (DISCONT) which triggers a flush of the gather queue:
*
* Copy head of the gather queue (6) to decode queue:
*
* gather queue: 5 4
* decode queue: 6 7 8 9
*
* Copy head of the gather queue (5) to decode queue. This is a keyframe so we
* can start decoding.
*
* gather queue: 4
* decode queue: 5 6 7 8 9
*
* Decode frames in decode queue, store raw decoded data in output queue, we
* can take the head of the decode queue and prepend the decoded result in the
* output queue:
*
* gather queue: 4
* decode queue:
* output queue: 9 8 7 6 5
*
* Now output all the frames in the output queue, picking a frame from the
* head of the queue.
*
* Copy head of the gather queue (4) to decode queue, we flushed the gather
* queue and can now store input buffer in the gather queue:
*
* gather queue: 1
* decode queue: 4
*
* When we receive EOS, the queue looks like:
*
* gather queue: 3 2 1
* decode queue: 4
*
* Fill decode queue, first keyframe we copy is 2:
*
* gather queue: 1
* decode queue: 2 3 4
*
* Decoded output:
*
* gather queue: 1
* decode queue:
* output queue: 4 3 2
*
* Leftover buffer 1 cannot be decoded and must be discarded.
*/
#include "gstvideodecoder.h"
#include "gstvideoutils.h"
#include "gstvideoutilsprivate.h"
#include <gst/video/video.h>
#include <gst/video/video-event.h>
#include <gst/video/gstvideopool.h>
#include <gst/video/gstvideometa.h>
#include <string.h>
GST_DEBUG_CATEGORY (videodecoder_debug);
#define GST_CAT_DEFAULT videodecoder_debug
#define GST_VIDEO_DECODER_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_VIDEO_DECODER, \
GstVideoDecoderPrivate))
struct _GstVideoDecoderPrivate
{
/* FIXME introduce a context ? */
GstBufferPool *pool;
GstAllocator *allocator;
GstAllocationParams params;
/* parse tracking */
/* input data */
GstAdapter *input_adapter;
/* assembles current frame */
GstAdapter *output_adapter;
/* Whether we attempt to convert newsegment from bytes to
* time using a bitrate estimation */
gboolean do_estimate_rate;
/* Whether input is considered packetized or not */
gboolean packetized;
/* Error handling */
gint max_errors;
gint error_count;
gboolean had_output_data;
gboolean had_input_data;
gboolean needs_format;
/* input_segment are output_segment identical */
gboolean in_out_segment_sync;
/* ... being tracked here;
* only available during parsing */
GstVideoCodecFrame *current_frame;
/* events that should apply to the current frame */
GList *current_frame_events;
/* events that should be pushed before the next frame */
GList *pending_events;
/* relative offset of input data */
guint64 input_offset;
/* relative offset of frame */
guint64 frame_offset;
/* tracking ts and offsets */
GList *timestamps;
/* last outgoing ts */
GstClockTime last_timestamp_out;
/* incoming pts - dts */
GstClockTime pts_delta;
gboolean reordered_output;
/* reverse playback */
/* collect input */
GList *gather;
/* to-be-parsed */
GList *parse;
/* collected parsed frames */
GList *parse_gather;
/* frames to be handled == decoded */
GList *decode;
/* collected output - of buffer objects, not frames */
GList *output_queued;
/* base_picture_number is the picture number of the reference picture */
guint64 base_picture_number;
/* combine with base_picture_number, framerate and calcs to yield (presentation) ts */
GstClockTime base_timestamp;
/* FIXME : reorder_depth is never set */
int reorder_depth;
int distance_from_sync;
guint32 system_frame_number;
guint32 decode_frame_number;
GList *frames; /* Protected with OBJECT_LOCK */
GstVideoCodecState *input_state;
GstVideoCodecState *output_state; /* OBJECT_LOCK and STREAM_LOCK */
gboolean output_state_changed;
/* QoS properties */
gdouble proportion; /* OBJECT_LOCK */
GstClockTime earliest_time; /* OBJECT_LOCK */
GstClockTime qos_frame_duration; /* OBJECT_LOCK */
gboolean discont;
/* qos messages: frames dropped/processed */
guint dropped;
guint processed;
/* Outgoing byte size ? */
gint64 bytes_out;
gint64 time;
gint64 min_latency;
gint64 max_latency;
/* upstream stream tags (global tags are passed through as-is) */
GstTagList *upstream_tags;
/* subclass tags */
GstTagList *tags;
GstTagMergeMode tags_merge_mode;
gboolean tags_changed;
/* flags */
gboolean use_default_pad_acceptcaps;
#ifndef GST_DISABLE_DEBUG
/* Diagnostic time for reporting the time
* from flush to first output */
GstClockTime last_reset_time;
#endif
};
static GstElementClass *parent_class = NULL;
static void gst_video_decoder_class_init (GstVideoDecoderClass * klass);
static void gst_video_decoder_init (GstVideoDecoder * dec,
GstVideoDecoderClass * klass);
static void gst_video_decoder_finalize (GObject * object);
static gboolean gst_video_decoder_setcaps (GstVideoDecoder * dec,
GstCaps * caps);
static gboolean gst_video_decoder_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_video_decoder_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstFlowReturn gst_video_decoder_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static gboolean gst_video_decoder_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static GstStateChangeReturn gst_video_decoder_change_state (GstElement *
element, GstStateChange transition);
static gboolean gst_video_decoder_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static void gst_video_decoder_reset (GstVideoDecoder * decoder, gboolean full,
gboolean flush_hard);
static GstFlowReturn gst_video_decoder_decode_frame (GstVideoDecoder * decoder,
GstVideoCodecFrame * frame);
static void gst_video_decoder_push_event_list (GstVideoDecoder * decoder,
GList * events);
static GstClockTime gst_video_decoder_get_frame_duration (GstVideoDecoder *
decoder, GstVideoCodecFrame * frame);
static GstVideoCodecFrame *gst_video_decoder_new_frame (GstVideoDecoder *
decoder);
static GstFlowReturn gst_video_decoder_clip_and_push_buf (GstVideoDecoder *
decoder, GstBuffer * buf);
static GstFlowReturn gst_video_decoder_flush_parse (GstVideoDecoder * dec,
gboolean at_eos);
static void gst_video_decoder_clear_queues (GstVideoDecoder * dec);
static gboolean gst_video_decoder_sink_event_default (GstVideoDecoder * decoder,
GstEvent * event);
static gboolean gst_video_decoder_src_event_default (GstVideoDecoder * decoder,
GstEvent * event);
static gboolean gst_video_decoder_decide_allocation_default (GstVideoDecoder *
decoder, GstQuery * query);
static gboolean gst_video_decoder_propose_allocation_default (GstVideoDecoder *
decoder, GstQuery * query);
static gboolean gst_video_decoder_negotiate_default (GstVideoDecoder * decoder);
static GstFlowReturn gst_video_decoder_parse_available (GstVideoDecoder * dec,
gboolean at_eos, gboolean new_buffer);
static gboolean gst_video_decoder_negotiate_unlocked (GstVideoDecoder *
decoder);
static gboolean gst_video_decoder_sink_query_default (GstVideoDecoder * decoder,
GstQuery * query);
static gboolean gst_video_decoder_src_query_default (GstVideoDecoder * decoder,
GstQuery * query);
static gboolean gst_video_decoder_transform_meta_default (GstVideoDecoder *
decoder, GstVideoCodecFrame * frame, GstMeta * meta);
/* we can't use G_DEFINE_ABSTRACT_TYPE because we need the klass in the _init
* method to get to the padtemplates */
GType
gst_video_decoder_get_type (void)
{
static volatile gsize type = 0;
if (g_once_init_enter (&type)) {
GType _type;
static const GTypeInfo info = {
sizeof (GstVideoDecoderClass),
NULL,
NULL,
(GClassInitFunc) gst_video_decoder_class_init,
NULL,
NULL,
sizeof (GstVideoDecoder),
0,
(GInstanceInitFunc) gst_video_decoder_init,
};
_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstVideoDecoder", &info, G_TYPE_FLAG_ABSTRACT);
g_once_init_leave (&type, _type);
}
return type;
}
static void
gst_video_decoder_class_init (GstVideoDecoderClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = G_OBJECT_CLASS (klass);
gstelement_class = GST_ELEMENT_CLASS (klass);
GST_DEBUG_CATEGORY_INIT (videodecoder_debug, "videodecoder", 0,
"Base Video Decoder");
parent_class = g_type_class_peek_parent (klass);
g_type_class_add_private (klass, sizeof (GstVideoDecoderPrivate));
gobject_class->finalize = gst_video_decoder_finalize;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_video_decoder_change_state);
klass->sink_event = gst_video_decoder_sink_event_default;
klass->src_event = gst_video_decoder_src_event_default;
klass->decide_allocation = gst_video_decoder_decide_allocation_default;
klass->propose_allocation = gst_video_decoder_propose_allocation_default;
klass->negotiate = gst_video_decoder_negotiate_default;
klass->sink_query = gst_video_decoder_sink_query_default;
klass->src_query = gst_video_decoder_src_query_default;
klass->transform_meta = gst_video_decoder_transform_meta_default;
}
static void
gst_video_decoder_init (GstVideoDecoder * decoder, GstVideoDecoderClass * klass)
{
GstPadTemplate *pad_template;
GstPad *pad;
GST_DEBUG_OBJECT (decoder, "gst_video_decoder_init");
decoder->priv = GST_VIDEO_DECODER_GET_PRIVATE (decoder);
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass), "sink");
g_return_if_fail (pad_template != NULL);
decoder->sinkpad = pad = gst_pad_new_from_template (pad_template, "sink");
gst_pad_set_chain_function (pad, GST_DEBUG_FUNCPTR (gst_video_decoder_chain));
gst_pad_set_event_function (pad,
GST_DEBUG_FUNCPTR (gst_video_decoder_sink_event));
gst_pad_set_query_function (pad,
GST_DEBUG_FUNCPTR (gst_video_decoder_sink_query));
gst_element_add_pad (GST_ELEMENT (decoder), decoder->sinkpad);
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (klass), "src");
g_return_if_fail (pad_template != NULL);
decoder->srcpad = pad = gst_pad_new_from_template (pad_template, "src");
gst_pad_set_event_function (pad,
GST_DEBUG_FUNCPTR (gst_video_decoder_src_event));
gst_pad_set_query_function (pad,
GST_DEBUG_FUNCPTR (gst_video_decoder_src_query));
gst_element_add_pad (GST_ELEMENT (decoder), decoder->srcpad);
gst_segment_init (&decoder->input_segment, GST_FORMAT_TIME);
gst_segment_init (&decoder->output_segment, GST_FORMAT_TIME);
g_rec_mutex_init (&decoder->stream_lock);
decoder->priv->input_adapter = gst_adapter_new ();
decoder->priv->output_adapter = gst_adapter_new ();
decoder->priv->packetized = TRUE;
decoder->priv->needs_format = FALSE;
decoder->priv->min_latency = 0;
decoder->priv->max_latency = 0;
gst_video_decoder_reset (decoder, TRUE, TRUE);
}
static GstVideoCodecState *
_new_input_state (GstCaps * caps)
{
GstVideoCodecState *state;
GstStructure *structure;
const GValue *codec_data;
state = g_slice_new0 (GstVideoCodecState);
state->ref_count = 1;
gst_video_info_init (&state->info);
if (G_UNLIKELY (!gst_video_info_from_caps (&state->info, caps)))
goto parse_fail;
state->caps = gst_caps_ref (caps);
structure = gst_caps_get_structure (caps, 0);
codec_data = gst_structure_get_value (structure, "codec_data");
if (codec_data && G_VALUE_TYPE (codec_data) == GST_TYPE_BUFFER)
state->codec_data = GST_BUFFER (g_value_dup_boxed (codec_data));
return state;
parse_fail:
{
g_slice_free (GstVideoCodecState, state);
return NULL;
}
}
static GstVideoCodecState *
_new_output_state (GstVideoFormat fmt, guint width, guint height,
GstVideoCodecState * reference)
{
GstVideoCodecState *state;
state = g_slice_new0 (GstVideoCodecState);
state->ref_count = 1;
gst_video_info_init (&state->info);
if (!gst_video_info_set_format (&state->info, fmt, width, height)) {
g_slice_free (GstVideoCodecState, state);
return NULL;
}
if (reference) {
GstVideoInfo *tgt, *ref;
tgt = &state->info;
ref = &reference->info;
/* Copy over extra fields from reference state */
tgt->interlace_mode = ref->interlace_mode;
tgt->flags = ref->flags;
/* only copy values that are not unknown so that we don't override the
* defaults. subclasses should really fill these in when they know. */
if (ref->chroma_site)
tgt->chroma_site = ref->chroma_site;
if (ref->colorimetry.range)
tgt->colorimetry.range = ref->colorimetry.range;
if (ref->colorimetry.matrix)
tgt->colorimetry.matrix = ref->colorimetry.matrix;
if (ref->colorimetry.transfer)
tgt->colorimetry.transfer = ref->colorimetry.transfer;
if (ref->colorimetry.primaries)
tgt->colorimetry.primaries = ref->colorimetry.primaries;
GST_DEBUG ("reference par %d/%d fps %d/%d",
ref->par_n, ref->par_d, ref->fps_n, ref->fps_d);
tgt->par_n = ref->par_n;
tgt->par_d = ref->par_d;
tgt->fps_n = ref->fps_n;
tgt->fps_d = ref->fps_d;
tgt->views = ref->views;
GST_VIDEO_INFO_FIELD_ORDER (tgt) = GST_VIDEO_INFO_FIELD_ORDER (ref);
if (GST_VIDEO_INFO_MULTIVIEW_MODE (ref) != GST_VIDEO_MULTIVIEW_MODE_NONE) {
GST_VIDEO_INFO_MULTIVIEW_MODE (tgt) = GST_VIDEO_INFO_MULTIVIEW_MODE (ref);
GST_VIDEO_INFO_MULTIVIEW_FLAGS (tgt) =
GST_VIDEO_INFO_MULTIVIEW_FLAGS (ref);
} else {
/* Default to MONO, overridden as needed by sub-classes */
GST_VIDEO_INFO_MULTIVIEW_MODE (tgt) = GST_VIDEO_MULTIVIEW_MODE_MONO;
GST_VIDEO_INFO_MULTIVIEW_FLAGS (tgt) = GST_VIDEO_MULTIVIEW_FLAGS_NONE;
}
}
GST_DEBUG ("reference par %d/%d fps %d/%d",
state->info.par_n, state->info.par_d,
state->info.fps_n, state->info.fps_d);
return state;
}
static gboolean
gst_video_decoder_setcaps (GstVideoDecoder * decoder, GstCaps * caps)
{
GstVideoDecoderClass *decoder_class;
GstVideoCodecState *state;
gboolean ret = TRUE;
decoder_class = GST_VIDEO_DECODER_GET_CLASS (decoder);
GST_DEBUG_OBJECT (decoder, "setcaps %" GST_PTR_FORMAT, caps);
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
if (decoder->priv->input_state) {
GST_DEBUG_OBJECT (decoder,
"Checking if caps changed old %" GST_PTR_FORMAT " new %" GST_PTR_FORMAT,
decoder->priv->input_state->caps, caps);
if (gst_caps_is_equal (decoder->priv->input_state->caps, caps))
goto caps_not_changed;
}
state = _new_input_state (caps);
if (G_UNLIKELY (state == NULL))
goto parse_fail;
if (decoder_class->set_format)
ret = decoder_class->set_format (decoder, state);
if (!ret)
goto refused_format;
if (decoder->priv->input_state)
gst_video_codec_state_unref (decoder->priv->input_state);
decoder->priv->input_state = state;
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
return ret;
caps_not_changed:
{
GST_DEBUG_OBJECT (decoder, "Caps did not change - ignore");
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
return TRUE;
}
/* ERRORS */
parse_fail:
{
GST_WARNING_OBJECT (decoder, "Failed to parse caps");
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
return FALSE;
}
refused_format:
{
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
GST_WARNING_OBJECT (decoder, "Subclass refused caps");
gst_video_codec_state_unref (state);
return FALSE;
}
}
static void
gst_video_decoder_finalize (GObject * object)
{
GstVideoDecoder *decoder;
decoder = GST_VIDEO_DECODER (object);
GST_DEBUG_OBJECT (object, "finalize");
g_rec_mutex_clear (&decoder->stream_lock);
if (decoder->priv->input_adapter) {
g_object_unref (decoder->priv->input_adapter);
decoder->priv->input_adapter = NULL;
}
if (decoder->priv->output_adapter) {
g_object_unref (decoder->priv->output_adapter);
decoder->priv->output_adapter = NULL;
}
if (decoder->priv->input_state)
gst_video_codec_state_unref (decoder->priv->input_state);
if (decoder->priv->output_state)
gst_video_codec_state_unref (decoder->priv->output_state);
if (decoder->priv->pool) {
gst_object_unref (decoder->priv->pool);
decoder->priv->pool = NULL;
}
if (decoder->priv->allocator) {
gst_object_unref (decoder->priv->allocator);
decoder->priv->allocator = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/* hard == FLUSH, otherwise discont */
static GstFlowReturn
gst_video_decoder_flush (GstVideoDecoder * dec, gboolean hard)
{
GstVideoDecoderClass *klass = GST_VIDEO_DECODER_GET_CLASS (dec);
GstFlowReturn ret = GST_FLOW_OK;
GST_LOG_OBJECT (dec, "flush hard %d", hard);
/* Inform subclass */
if (klass->reset) {
GST_FIXME_OBJECT (dec, "GstVideoDecoder::reset() is deprecated");
klass->reset (dec, hard);
}
if (klass->flush)
klass->flush (dec);
/* and get (re)set for the sequel */
gst_video_decoder_reset (dec, FALSE, hard);
return ret;
}
static GstEvent *
gst_video_decoder_create_merged_tags_event (GstVideoDecoder * dec)
{
GstTagList *merged_tags;
GST_LOG_OBJECT (dec, "upstream : %" GST_PTR_FORMAT, dec->priv->upstream_tags);
GST_LOG_OBJECT (dec, "decoder : %" GST_PTR_FORMAT, dec->priv->tags);
GST_LOG_OBJECT (dec, "mode : %d", dec->priv->tags_merge_mode);
merged_tags =
gst_tag_list_merge (dec->priv->upstream_tags, dec->priv->tags,
dec->priv->tags_merge_mode);
GST_DEBUG_OBJECT (dec, "merged : %" GST_PTR_FORMAT, merged_tags);
if (merged_tags == NULL)
return NULL;
if (gst_tag_list_is_empty (merged_tags)) {
gst_tag_list_unref (merged_tags);
return NULL;
}
return gst_event_new_tag (merged_tags);
}
static gboolean
gst_video_decoder_push_event (GstVideoDecoder * decoder, GstEvent * event)
{
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEGMENT:
{
GstSegment segment;
gst_event_copy_segment (event, &segment);
GST_DEBUG_OBJECT (decoder, "segment %" GST_SEGMENT_FORMAT, &segment);
if (segment.format != GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (decoder, "received non TIME newsegment");
break;
}
GST_VIDEO_DECODER_STREAM_LOCK (decoder);
decoder->output_segment = segment;
decoder->priv->in_out_segment_sync =
gst_segment_is_equal (&decoder->input_segment, &segment);
decoder->priv->last_timestamp_out = GST_CLOCK_TIME_NONE;
GST_VIDEO_DECODER_STREAM_UNLOCK (decoder);
break;
}
default:
break;
}
GST_DEBUG_OBJECT (decoder, "pushing event %s",
gst_event_type_get_name (GST_EVENT_TYPE (event)));
return gst_pad_push_event (decoder->srcpad, event);
}
static GstFlowReturn
gst_video_decoder_parse_available (GstVideoDecoder * dec, gboolean at_eos,
gboolean new_buffer)
{
GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_GET_CLASS (dec);
GstVideoDecoderPrivate *priv = dec->priv;
GstFlowReturn ret = GST_FLOW_OK;
gsize was_available, available;
guint inactive = 0;
available = gst_adapter_available (priv->input_adapter);
while (available || new_buffer) {
new_buffer = FALSE;
/* current frame may have been parsed and handled,
* so we need to set up a new one when asking subclass to parse */
if (priv->current_frame == NULL)
priv->current_frame = gst_video_decoder_new_frame (dec);
was_available = available;
ret = decoder_class->parse (dec, priv->current_frame,
priv->input_adapter, at_eos);
if (ret != GST_FLOW_OK)
break;
/* if the subclass returned success (GST_FLOW_OK), it is expected
* to have collected and submitted a frame, i.e. it should have
* called gst_video_decoder_have_frame(), or at least consumed a
* few bytes through gst_video_decoder_add_to_frame().
*
* Otherwise, this is an implementation bug, and we error out
* after 2 failed attempts */
available = gst_adapter_available (priv->input_adapter);
if (!priv->current_frame || available != was_available)
inactive = 0;
else if (++inactive == 2)
goto error_inactive;
}
return ret;
/* ERRORS */
error_inactive:
{
GST_ERROR_OBJECT (dec, "Failed to consume data. Error in subclass?");
return GST_FLOW_ERROR;
}
}
/* This function has to be called with the stream lock taken. */
static GstFlowReturn
gst_video_decoder_drain_out (GstVideoDecoder * dec, gboolean at_eos)
{
GstVideoDecoderClass *decoder_class = GST_VIDEO_DECODER_GET_CLASS (dec);
GstVideoDecoderPrivate *priv = dec->priv;
GstFlowReturn ret = GST_FLOW_OK;
if (dec->input_segment.rate > 0.0) {
/* Forward mode, if unpacketized, give the child class
* a final chance to flush out packets */
if (!priv->packetized) {
ret = gst_video_decoder_parse_available (dec, TRUE, FALSE);
}
if (at_eos) {
if (decoder_class->finish)
ret = decoder_class->finish (dec);
} else {
if (decoder_class->drain) {
ret = decoder_class->drain (dec);
} else {
GST_FIXME_OBJECT (dec, "Sub-class should implement drain()");
}
}
} else {
/* Reverse playback mode */
ret = gst_video_decoder_flush_parse (dec, TRUE);
}
return ret;
}
static GList *
_flush_events (GstPad * pad, GList * events)
{
GList *tmp;
for (tmp = events; tmp; tmp = tmp->next) {
if (GST_EVENT_TYPE (tmp->data) != GST_EVENT_EOS &&
GST_EVENT_TYPE (tmp->data) != GST_EVENT_SEGMENT &&
GST_EVENT_IS_STICKY (tmp->data)) {
gst_pad_store_sticky_event (pad, GST_EVENT_CAST (tmp->data));
}
gst_event_unref (tmp->data);
}
g_list_free (events);
return NULL;
}
/* Must be called holding the GST_VIDEO_DECODER_STREAM_LOCK */
static gboolean
gst_video_decoder_negotiate_default_caps (GstVideoDecoder * decoder)
{
GstCaps *caps, *templcaps;
GstVideoCodecState *state;
GstVideoInfo info;
gint i;
gint caps_size;
GstStructure *structure;
templcaps = gst_pad_get_pad_template_caps (decoder->srcpad);
caps = gst_pad_peer_query_caps (decoder->srcpad, templcaps);
if (caps)
gst_caps_unref (templcaps);
else
caps = templcaps;
templcaps = NULL;
if (!caps || gst_caps_is_empty (caps) || gst_caps_is_any (caps))
goto caps_error;
GST_LOG_OBJECT (decoder, "peer caps %" GST_PTR_FORMAT, caps);
/* before fixating, try to use whatever upstream provided */
caps = gst_caps_make_writable (caps);
caps_size = gst_caps_get_size (caps);
if (decoder->priv->input_state && decoder->priv->input_state->caps) {
GstCaps *sinkcaps = decoder->priv->input_state->caps;
GstStructure *structure = gst_caps_get_structure (sinkcaps, 0);
gint width, height;
gint par_n, par_d;
gint fps_n, fps_d;
if (gst_structure_get_int (structure, "width", &width)) {
for (i = 0; i < caps_size; i++) {
gst_structure_set (gst_caps_get_structure (caps, i), "width",
G_TYPE_INT, width, NULL);
}
}