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gstreamer/ext/mpeg2dec/gstmpeg2dec.c
Tim-Philipp Müller 596647664f mpeg2dec: remove all seeking-related code 
A parser or demuxer upstream should handle this Same for
queries.
2011-12-30 18:23:13 +00:00

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/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <inttypes.h>
#include "gstmpeg2dec.h"
/* 16byte-aligns a buffer for libmpeg2 */
#define ALIGN_16(p) ((void *)(((uintptr_t)(p) + 15) & ~((uintptr_t)15)))
/* mpeg2dec changed a struct name after 0.3.1, here's a workaround */
/* mpeg2dec also only defined MPEG2_RELEASE after 0.3.1
#if MPEG2_RELEASE < MPEG2_VERSION(0,3,2)
*/
#ifndef MPEG2_RELEASE
#define MPEG2_VERSION(a,b,c) ((((a)&0xff)<<16)|(((b)&0xff)<<8)|((c)&0xff))
#define MPEG2_RELEASE MPEG2_VERSION(0,3,1)
typedef picture_t mpeg2_picture_t;
typedef gint mpeg2_state_t;
#define STATE_BUFFER 0
#endif
GST_DEBUG_CATEGORY_STATIC (mpeg2dec_debug);
#define GST_CAT_DEFAULT (mpeg2dec_debug)
/* Send a warning message about decoding errors after receiving this many
* STATE_INVALID return values from mpeg2_parse. -1 means never.
*/
#define WARN_THRESHOLD (5)
//#define enable_user_data
#ifdef enable_user_data
static GstStaticPadTemplate user_data_template_factory =
GST_STATIC_PAD_TEMPLATE ("user_data",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
#endif
static GstStaticPadTemplate sink_template_factory =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/mpeg, "
"mpegversion = (int) [ 1, 2 ], " "systemstream = (boolean) false")
);
static GstStaticPadTemplate src_template_factory =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw, "
"format = (string) { I420, Y42B, Y444 }, "
"width = (int) [ 16, 4096 ], "
"height = (int) [ 16, 4096 ], "
"framerate = (fraction) [ 0/1, 2147483647/1 ]")
);
static void gst_mpeg2dec_finalize (GObject * object);
static void gst_mpeg2dec_reset (GstMpeg2dec * mpeg2dec);
static gboolean gst_mpeg2dec_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstStateChangeReturn gst_mpeg2dec_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_mpeg2dec_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_mpeg2dec_setcaps (GstPad * pad, GstCaps * caps);
static GstFlowReturn gst_mpeg2dec_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static void clear_buffers (GstMpeg2dec * mpeg2dec);
//static gboolean gst_mpeg2dec_sink_query (GstPad * pad, GstObject * parent, GstQuery * query);
#if 0
static const GstFormat *gst_mpeg2dec_get_formats (GstPad * pad);
#endif
#if 0
static const GstEventMask *gst_mpeg2dec_get_event_masks (GstPad * pad);
#endif
#if 0
static gboolean gst_mpeg2dec_crop_buffer (GstMpeg2dec * dec, GstBuffer ** buf);
#endif
/*static guint gst_mpeg2dec_signals[LAST_SIGNAL] = { 0 };*/
#define gst_mpeg2dec_parent_class parent_class
G_DEFINE_TYPE (GstMpeg2dec, gst_mpeg2dec, GST_TYPE_ELEMENT);
static void
gst_mpeg2dec_class_init (GstMpeg2decClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
gobject_class->finalize = gst_mpeg2dec_finalize;
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&src_template_factory));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sink_template_factory));
#ifdef enable_user_data
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&user_data_template_factory));
#endif
gst_element_class_set_details_simple (gstelement_class,
"mpeg1 and mpeg2 video decoder", "Codec/Decoder/Video",
"Uses libmpeg2 to decode MPEG video streams",
"Wim Taymans <wim.taymans@gmail.com>");
gstelement_class->change_state = gst_mpeg2dec_change_state;
GST_DEBUG_CATEGORY_INIT (mpeg2dec_debug, "mpeg2dec", 0,
"MPEG2 decoder element");
}
static void
gst_mpeg2dec_init (GstMpeg2dec * mpeg2dec)
{
/* create the sink and src pads */
mpeg2dec->sinkpad =
gst_pad_new_from_static_template (&sink_template_factory, "sink");
gst_pad_set_chain_function (mpeg2dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_chain));
#if 0
gst_pad_set_query_function (mpeg2dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_get_sink_query));
#endif
gst_pad_set_event_function (mpeg2dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_sink_event));
gst_element_add_pad (GST_ELEMENT (mpeg2dec), mpeg2dec->sinkpad);
mpeg2dec->srcpad =
gst_pad_new_from_static_template (&src_template_factory, "src");
gst_pad_set_event_function (mpeg2dec->srcpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_src_event));
#if 0
gst_pad_set_query_function (mpeg2dec->srcpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_src_query));
#endif
gst_pad_use_fixed_caps (mpeg2dec->srcpad);
gst_element_add_pad (GST_ELEMENT (mpeg2dec), mpeg2dec->srcpad);
#ifdef enable_user_data
mpeg2dec->userdatapad =
gst_pad_new_from_static_template (&user_data_template_factory,
"user_data");
gst_element_add_pad (GST_ELEMENT (mpeg2dec), mpeg2dec->userdatapad);
#endif
mpeg2dec->error_count = 0;
mpeg2dec->can_allocate_aligned = TRUE;
/* initialize the mpeg2dec acceleration */
}
static void
gst_mpeg2dec_finalize (GObject * object)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (object);
if (mpeg2dec->decoder) {
GST_DEBUG_OBJECT (mpeg2dec, "closing decoder");
mpeg2_close (mpeg2dec->decoder);
mpeg2dec->decoder = NULL;
}
clear_buffers (mpeg2dec);
g_free (mpeg2dec->dummybuf[3]);
mpeg2dec->dummybuf[3] = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_mpeg2dec_reset (GstMpeg2dec * mpeg2dec)
{
/* reset the initial video state */
gst_video_info_init (&mpeg2dec->vinfo);
gst_segment_init (&mpeg2dec->segment, GST_FORMAT_UNDEFINED);
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
mpeg2dec->frame_period = 0;
mpeg2dec->need_sequence = TRUE;
mpeg2dec->next_time = -1;
mpeg2dec->offset = 0;
mpeg2dec->error_count = 0;
mpeg2dec->can_allocate_aligned = TRUE;
mpeg2_reset (mpeg2dec->decoder, 1);
}
static void
gst_mpeg2dec_qos_reset (GstMpeg2dec * mpeg2dec)
{
GST_OBJECT_LOCK (mpeg2dec);
mpeg2dec->proportion = 1.0;
mpeg2dec->earliest_time = -1;
mpeg2dec->dropped = 0;
mpeg2dec->processed = 0;
GST_OBJECT_UNLOCK (mpeg2dec);
}
#if 0
static GstFlowReturn
gst_mpeg2dec_crop_buffer (GstMpeg2dec * dec, GstBuffer ** buf)
{
GstFlowReturn flow_ret;
GstBuffer *inbuf = *buf;
GstBuffer *outbuf;
guint outsize, c;
outsize = gst_video_format_get_size (dec->format, dec->width, dec->height);
GST_LOG_OBJECT (dec, "Copying input buffer %ux%u (%u) to output buffer "
"%ux%u (%u)", dec->decoded_width, dec->decoded_height,
GST_BUFFER_SIZE (inbuf), dec->width, dec->height, outsize);
flow_ret = gst_pad_alloc_buffer_and_set_caps (dec->srcpad,
GST_BUFFER_OFFSET_NONE, outsize, GST_PAD_CAPS (dec->srcpad), &outbuf);
if (G_UNLIKELY (flow_ret != GST_FLOW_OK))
return flow_ret;
for (c = 0; c < 3; c++) {
const guint8 *src;
guint8 *dest;
guint stride_in, stride_out;
guint c_height, c_width, line;
src =
GST_BUFFER_DATA (inbuf) +
gst_video_format_get_component_offset (dec->format, c,
dec->decoded_width, dec->decoded_height);
dest =
GST_BUFFER_DATA (outbuf) +
gst_video_format_get_component_offset (dec->format, c, dec->width,
dec->height);
stride_out = gst_video_format_get_row_stride (dec->format, c, dec->width);
stride_in =
gst_video_format_get_row_stride (dec->format, c, dec->decoded_width);
c_height =
gst_video_format_get_component_height (dec->format, c, dec->height);
c_width = gst_video_format_get_component_width (dec->format, c, dec->width);
for (line = 0; line < c_height; line++) {
memcpy (dest, src, c_width);
dest += stride_out;
src += stride_in;
}
}
gst_buffer_copy_metadata (outbuf, inbuf,
GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_FLAGS);
gst_buffer_unref (*buf);
*buf = outbuf;
return GST_FLOW_OK;
}
#endif
static GstFlowReturn
gst_mpeg2dec_negotiate_pool (GstMpeg2dec * dec, GstCaps * caps,
GstVideoInfo * info)
{
GstQuery *query;
GstBufferPool *pool = NULL;
guint size, min, max, prefix, alignment;
GstStructure *config;
/* find a pool for the negotiated caps now */
query = gst_query_new_allocation (caps, TRUE);
if (gst_pad_peer_query (dec->srcpad, query)) {
GST_DEBUG_OBJECT (dec, "got downstream ALLOCATION hints");
/* we got configuration from our peer, parse them */
gst_query_parse_allocation_params (query, &size, &min, &max, &prefix,
&alignment, &pool);
size = MAX (size, info->size);
alignment |= 15;
} else {
GST_DEBUG_OBJECT (dec, "didn't get downstream ALLOCATION hints");
size = info->size;
min = max = 0;
prefix = 0;
alignment = 15;
}
GST_DEBUG_OBJECT (dec,
"size:%d, min:%d, max:%d, prefix:%d, alignment:%d, pool:%p", size, min,
max, prefix, alignment, pool);
if (pool == NULL) {
/* we did not get a pool, make one ourselves then */
pool = gst_buffer_pool_new ();
}
if (dec->pool)
gst_object_unref (dec->pool);
dec->pool = pool;
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set (config, caps, size, min, max, prefix, alignment);
/* just set the option, if the pool can support it we will transparently use
* it through the video info API. We could also see if the pool support this
* option and only activate it then. */
gst_buffer_pool_config_add_option (config, GST_BUFFER_POOL_OPTION_VIDEO_META);
/* check if downstream supports cropping */
dec->use_cropping =
gst_query_has_allocation_meta (query, GST_VIDEO_CROP_META_API);
GST_DEBUG_OBJECT (dec, "downstream supports cropping : %d",
dec->use_cropping);
gst_buffer_pool_set_config (pool, config);
/* and activate */
gst_buffer_pool_set_active (pool, TRUE);
gst_query_unref (query);
return GST_FLOW_OK;
}
static void
init_dummybuf (GstMpeg2dec * mpeg2dec)
{
g_free (mpeg2dec->dummybuf[3]);
/* libmpeg2 needs 16 byte aligned buffers... care for this here */
mpeg2dec->dummybuf[3] = g_malloc0 (mpeg2dec->size + 15);
mpeg2dec->dummybuf[0] = ALIGN_16 (mpeg2dec->dummybuf[3]);
mpeg2dec->dummybuf[1] = mpeg2dec->dummybuf[0] + mpeg2dec->u_offs;
mpeg2dec->dummybuf[2] = mpeg2dec->dummybuf[0] + mpeg2dec->v_offs;
}
static GstFlowReturn
handle_sequence (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
{
GstFlowReturn ret = GST_FLOW_OK;
const mpeg2_sequence_t *sequence;
gint par_n, par_d;
gint width, height;
GstVideoInfo vinfo;
GstVideoFormat format;
GstCaps *caps;
gint y_size, uv_size;
sequence = info->sequence;
if (sequence->frame_period == 0)
goto invalid_frame_period;
mpeg2dec->width = width = sequence->picture_width;
mpeg2dec->height = height = sequence->picture_height;
/* mpeg2 video can only be from 16x16 to 4096x4096. Everything
* else is a corrupted file */
if (width > 4096 || width < 16 || height > 4096 || height < 16)
goto invalid_size;
y_size = sequence->width * sequence->height;
/* get subsampling */
if (sequence->chroma_width < sequence->width) {
/* horizontally subsampled */
if (sequence->chroma_height < sequence->height) {
/* and vertically subsamples */
format = GST_VIDEO_FORMAT_I420;
uv_size = y_size >> 2;
} else {
format = GST_VIDEO_FORMAT_Y42B;
uv_size = y_size >> 1;
}
} else {
/* not subsampled */
format = GST_VIDEO_FORMAT_Y444;
uv_size = y_size;
}
/* calculate size and offsets of the decoded frames */
mpeg2dec->size = y_size + 2 * (uv_size);
mpeg2dec->u_offs = y_size;
mpeg2dec->v_offs = y_size + uv_size;
gst_video_info_init (&vinfo);
gst_video_info_set_format (&vinfo, format, sequence->width, sequence->height);
/* size of the decoded frame */
mpeg2dec->decoded_width = sequence->width;
mpeg2dec->decoded_height = sequence->height;
GST_DEBUG_OBJECT (mpeg2dec,
"widthxheight: %dx%d , decoded_widthxheight: %dx%d", width, height,
sequence->width, sequence->height);
/* sink caps par overrides sequence PAR */
if (mpeg2dec->have_par) {
par_n = mpeg2dec->in_par_n;
par_d = mpeg2dec->in_par_d;
GST_DEBUG_OBJECT (mpeg2dec, "using sink par %d:%d", par_n, par_d);
} else {
par_n = sequence->pixel_width;
par_d = sequence->pixel_height;
GST_DEBUG_OBJECT (mpeg2dec, "using encoded par %d:%d", par_n, par_d);
}
if (par_n == 0 || par_d == 0) {
if (!gst_util_fraction_multiply (4, 3, height, width, &par_n, &par_d))
par_n = par_d = 1;
GST_WARNING_OBJECT (mpeg2dec, "Unknown par, assuming %d:%d", par_n, par_d);
}
vinfo.par_n = par_n;
vinfo.par_d = par_d;
/* set framerate */
vinfo.fps_n = 27000000;
vinfo.fps_d = sequence->frame_period;
mpeg2dec->frame_period = sequence->frame_period * GST_USECOND / 27;
if (!(sequence->flags & SEQ_FLAG_PROGRESSIVE_SEQUENCE))
vinfo.interlace_mode = GST_VIDEO_INTERLACE_MODE_MIXED;
else
vinfo.interlace_mode = GST_VIDEO_INTERLACE_MODE_PROGRESSIVE;
vinfo.chroma_site = GST_VIDEO_CHROMA_SITE_MPEG2;
vinfo.colorimetry.range = GST_VIDEO_COLOR_RANGE_16_235;
if (sequence->flags & SEQ_FLAG_COLOUR_DESCRIPTION) {
/* do color description */
switch (sequence->colour_primaries) {
case 1:
vinfo.colorimetry.primaries = GST_VIDEO_COLOR_PRIMARIES_BT709;
break;
case 4:
vinfo.colorimetry.primaries = GST_VIDEO_COLOR_PRIMARIES_BT470M;
break;
case 5:
vinfo.colorimetry.primaries = GST_VIDEO_COLOR_PRIMARIES_BT470BG;
break;
case 6:
vinfo.colorimetry.primaries = GST_VIDEO_COLOR_PRIMARIES_SMPTE170M;
break;
case 7:
vinfo.colorimetry.primaries = GST_VIDEO_COLOR_PRIMARIES_SMPTE240M;
break;
/* 0 forbidden */
/* 2 unspecified */
/* 3 reserved */
/* 8-255 reseved */
default:
vinfo.colorimetry.primaries = GST_VIDEO_COLOR_PRIMARIES_UNKNOWN;
break;
}
/* matrix coefficients */
switch (sequence->matrix_coefficients) {
case 1:
vinfo.colorimetry.matrix = GST_VIDEO_COLOR_MATRIX_BT709;
break;
case 4:
vinfo.colorimetry.matrix = GST_VIDEO_COLOR_MATRIX_FCC;
break;
case 5:
case 6:
vinfo.colorimetry.matrix = GST_VIDEO_COLOR_MATRIX_BT601;
break;
case 7:
vinfo.colorimetry.matrix = GST_VIDEO_COLOR_MATRIX_SMPTE240M;
break;
/* 0 forbidden */
/* 2 unspecified */
/* 3 reserved */
/* 8-255 reseved */
default:
vinfo.colorimetry.matrix = GST_VIDEO_COLOR_MATRIX_UNKNOWN;
break;
}
/* transfer characteristics */
switch (sequence->transfer_characteristics) {
case 1:
vinfo.colorimetry.transfer = GST_VIDEO_TRANSFER_BT709;
break;
case 4:
vinfo.colorimetry.transfer = GST_VIDEO_TRANSFER_GAMMA22;
break;
case 5:
vinfo.colorimetry.transfer = GST_VIDEO_TRANSFER_GAMMA28;
break;
case 6:
vinfo.colorimetry.transfer = GST_VIDEO_TRANSFER_BT709;
break;
case 7:
vinfo.colorimetry.transfer = GST_VIDEO_TRANSFER_SMPTE240M;
break;
case 8:
vinfo.colorimetry.transfer = GST_VIDEO_TRANSFER_GAMMA10;
break;
/* 0 forbidden */
/* 2 unspecified */
/* 3 reserved */
/* 9-255 reseved */
default:
vinfo.colorimetry.transfer = GST_VIDEO_TRANSFER_UNKNOWN;
break;
}
}
GST_DEBUG_OBJECT (mpeg2dec,
"sequence flags: %d, frame period: %d (%g), frame rate: %d/%d",
sequence->flags, sequence->frame_period,
(double) (mpeg2dec->frame_period) / GST_SECOND, vinfo.fps_n, vinfo.fps_d);
GST_DEBUG_OBJECT (mpeg2dec, "profile: %02x, colour_primaries: %d",
sequence->profile_level_id, sequence->colour_primaries);
GST_DEBUG_OBJECT (mpeg2dec, "transfer chars: %d, matrix coef: %d",
sequence->transfer_characteristics, sequence->matrix_coefficients);
GST_DEBUG_OBJECT (mpeg2dec,
"FLAGS: CONSTRAINED_PARAMETERS:%d, PROGRESSIVE_SEQUENCE:%d",
sequence->flags & SEQ_FLAG_CONSTRAINED_PARAMETERS,
sequence->flags & SEQ_FLAG_PROGRESSIVE_SEQUENCE);
GST_DEBUG_OBJECT (mpeg2dec, "FLAGS: LOW_DELAY:%d, COLOUR_DESCRIPTION:%d",
sequence->flags & SEQ_FLAG_LOW_DELAY,
sequence->flags & SEQ_FLAG_COLOUR_DESCRIPTION);
caps = gst_video_info_to_caps (&vinfo);
gst_pad_set_caps (mpeg2dec->srcpad, caps);
mpeg2dec->vinfo = vinfo;
gst_mpeg2dec_negotiate_pool (mpeg2dec, caps, &vinfo);
gst_caps_unref (caps);
mpeg2_custom_fbuf (mpeg2dec->decoder, 1);
init_dummybuf (mpeg2dec);
/* Pump in some null buffers, because otherwise libmpeg2 doesn't
* initialise the discard_fbuf->id */
mpeg2_set_buf (mpeg2dec->decoder, mpeg2dec->dummybuf, NULL);
mpeg2_set_buf (mpeg2dec->decoder, mpeg2dec->dummybuf, NULL);
mpeg2_set_buf (mpeg2dec->decoder, mpeg2dec->dummybuf, NULL);
mpeg2dec->need_sequence = FALSE;
done:
return ret;
invalid_frame_period:
{
GST_WARNING_OBJECT (mpeg2dec, "Frame period is 0!");
ret = GST_FLOW_ERROR;
goto done;
}
invalid_size:
{
GST_ERROR_OBJECT (mpeg2dec, "Invalid frame dimensions: %d x %d",
width, height);
return GST_FLOW_ERROR;
}
}
static void
clear_buffers (GstMpeg2dec * mpeg2dec)
{
gint i;
GstVideoFrame *frame;
for (i = 0; i < 4; i++) {
frame = &mpeg2dec->ip_frame[i];
if (frame->buffer) {
gst_video_frame_unmap (frame);
gst_buffer_unref (frame->buffer);
frame->buffer = NULL;
}
}
frame = &mpeg2dec->b_frame;
if (frame->buffer) {
gst_video_frame_unmap (frame);
gst_buffer_unref (frame->buffer);
frame->buffer = NULL;
}
}
static void
clear_queued (GstMpeg2dec * mpeg2dec)
{
g_list_foreach (mpeg2dec->queued, (GFunc) gst_mini_object_unref, NULL);
g_list_free (mpeg2dec->queued);
mpeg2dec->queued = NULL;
}
static GstFlowReturn
flush_queued (GstMpeg2dec * mpeg2dec)
{
GstFlowReturn res = GST_FLOW_OK;
while (mpeg2dec->queued) {
GstBuffer *buf = GST_BUFFER_CAST (mpeg2dec->queued->data);
GST_LOG_OBJECT (mpeg2dec, "pushing buffer %p, timestamp %"
GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT, buf,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buf)));
/* iterate ouput queue an push downstream */
res = gst_pad_push (mpeg2dec->srcpad, buf);
mpeg2dec->queued = g_list_delete_link (mpeg2dec->queued, mpeg2dec->queued);
}
return res;
}
static GstFlowReturn
handle_picture (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
{
gboolean key_frame = FALSE;
GstBuffer *outbuf;
GstVideoFrame *frame;
GstFlowReturn ret;
gint type;
guint8 *buf[3];
ret = gst_buffer_pool_acquire_buffer (mpeg2dec->pool, &outbuf, NULL);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto no_buffer;
/* we store the original byteoffset of this picture in the stream here
* because we need it for indexing */
GST_BUFFER_OFFSET (outbuf) = mpeg2dec->offset;
if (info->current_picture) {
type = info->current_picture->flags & PIC_MASK_CODING_TYPE;
} else {
type = 0;
}
GST_DEBUG_OBJECT (mpeg2dec, "handle picture type %d", type);
key_frame = type == PIC_FLAG_CODING_TYPE_I;
switch (type) {
case PIC_FLAG_CODING_TYPE_I:
mpeg2_skip (mpeg2dec->decoder, 0);
if (mpeg2dec->segment.rate < 0.0) {
/* negative rate, flush the queued pictures in reverse */
GST_DEBUG_OBJECT (mpeg2dec, "flushing queued buffers");
flush_queued (mpeg2dec);
}
/* fallthrough */
case PIC_FLAG_CODING_TYPE_P:
frame = &mpeg2dec->ip_frame[mpeg2dec->ip_framepos];
GST_DEBUG_OBJECT (mpeg2dec, "I/P unref %p, ref %p", frame, outbuf);
mpeg2dec->ip_framepos = (mpeg2dec->ip_framepos + 1) & 3;
break;
case PIC_FLAG_CODING_TYPE_B:
frame = &mpeg2dec->b_frame;
GST_DEBUG_OBJECT (mpeg2dec, "B unref %p, ref %p", frame, outbuf);
break;
default:
goto unknown_frame;
}
if (frame->buffer) {
gst_video_frame_unmap (frame);
gst_buffer_unref (frame->buffer);
}
gst_video_frame_map (frame, &mpeg2dec->vinfo, outbuf, GST_MAP_WRITE);
buf[0] = GST_VIDEO_FRAME_PLANE_DATA (frame, 0);
buf[1] = GST_VIDEO_FRAME_PLANE_DATA (frame, 1);
buf[2] = GST_VIDEO_FRAME_PLANE_DATA (frame, 2);
GST_DEBUG_OBJECT (mpeg2dec, "set_buf: %p %p %p, outbuf %p",
buf[0], buf[1], buf[2], outbuf);
mpeg2_set_buf (mpeg2dec->decoder, buf, frame);
GST_DEBUG_OBJECT (mpeg2dec, "picture %s, outbuf %p, offset %"
G_GINT64_FORMAT,
key_frame ? ", kf," : " ", outbuf, GST_BUFFER_OFFSET (outbuf)
);
if (mpeg2dec->discont_state == MPEG2DEC_DISC_NEW_PICTURE && key_frame)
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_KEYFRAME;
return ret;
no_buffer:
{
return ret;
}
unknown_frame:
{
return ret;
}
}
/* try to clip the buffer to the segment boundaries */
static gboolean
clip_buffer (GstMpeg2dec * dec, GstBuffer * buf)
{
gboolean res = TRUE;
GstClockTime in_ts, in_dur, stop;
guint64 cstart, cstop;
in_ts = GST_BUFFER_TIMESTAMP (buf);
in_dur = GST_BUFFER_DURATION (buf);
GST_LOG_OBJECT (dec,
"timestamp:%" GST_TIME_FORMAT " , duration:%" GST_TIME_FORMAT,
GST_TIME_ARGS (in_ts), GST_TIME_ARGS (in_dur));
/* can't clip without TIME segment */
if (dec->segment.format != GST_FORMAT_TIME)
goto beach;
/* we need a start time */
if (!GST_CLOCK_TIME_IS_VALID (in_ts))
goto beach;
/* generate valid stop, if duration unknown, we have unknown stop */
stop =
GST_CLOCK_TIME_IS_VALID (in_dur) ? (in_ts + in_dur) : GST_CLOCK_TIME_NONE;
/* now clip */
if (!(res = gst_segment_clip (&dec->segment, GST_FORMAT_TIME,
in_ts, stop, &cstart, &cstop)))
goto beach;
/* update timestamp and possibly duration if the clipped stop time is
* valid */
GST_BUFFER_TIMESTAMP (buf) = cstart;
if (GST_CLOCK_TIME_IS_VALID (cstop))
GST_BUFFER_DURATION (buf) = cstop - cstart;
beach:
GST_LOG_OBJECT (dec, "%sdropping", (res ? "not " : ""));
return res;
}
static GstFlowReturn
handle_slice (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
{
GstBuffer *outbuf = NULL;
GstFlowReturn ret = GST_FLOW_OK;
const mpeg2_picture_t *picture;
gboolean key_frame = FALSE;
GstClockTime time;
GstVideoFrame *frame;
GST_DEBUG_OBJECT (mpeg2dec, "picture slice/end %p %p %p %p",
info->display_fbuf,
info->display_picture, info->current_picture,
(info->display_fbuf ? info->display_fbuf->id : NULL));
if (!info->display_fbuf || !info->display_fbuf->id)
goto no_display;
frame = (GstVideoFrame *) (info->display_fbuf->id);
outbuf = frame->buffer;
picture = info->display_picture;
key_frame = (picture->flags & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_I;
GST_DEBUG_OBJECT (mpeg2dec, "picture flags: %d, type: %d, keyframe: %d",
picture->flags, picture->flags & PIC_MASK_CODING_TYPE, key_frame);
if (key_frame) {
GST_BUFFER_FLAG_UNSET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
mpeg2_skip (mpeg2dec->decoder, 0);
} else {
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
}
if (mpeg2dec->discont_state == MPEG2DEC_DISC_NEW_KEYFRAME && key_frame)
mpeg2dec->discont_state = MPEG2DEC_DISC_NONE;
time = GST_CLOCK_TIME_NONE;
#if MPEG2_RELEASE < MPEG2_VERSION(0,4,0)
if (picture->flags & PIC_FLAG_PTS) {
time = MPEG_TIME_TO_GST_TIME (picture->pts);
GST_DEBUG_OBJECT (mpeg2dec, "picture pts %" G_GUINT64_FORMAT
", time %" GST_TIME_FORMAT, picture->pts, GST_TIME_ARGS (time));
}
#else
if (picture->flags & PIC_FLAG_TAGS) {
guint64 pts = (((guint64) picture->tag2) << 32) | picture->tag;
time = MPEG_TIME_TO_GST_TIME (pts);
GST_DEBUG_OBJECT (mpeg2dec, "picture tags %" G_GUINT64_FORMAT
", time %" GST_TIME_FORMAT, pts, GST_TIME_ARGS (time));
}
#endif
if (time == GST_CLOCK_TIME_NONE) {
time = mpeg2dec->next_time;
GST_DEBUG_OBJECT (mpeg2dec, "picture didn't have pts");
} else {
GST_DEBUG_OBJECT (mpeg2dec,
"picture had pts %" GST_TIME_FORMAT ", we had %"
GST_TIME_FORMAT, GST_TIME_ARGS (time),
GST_TIME_ARGS (mpeg2dec->next_time));
mpeg2dec->next_time = time;
}
GST_BUFFER_TIMESTAMP (outbuf) = time;
/* TODO set correct offset here based on frame number */
if (info->display_picture_2nd) {
GST_BUFFER_DURATION (outbuf) = (picture->nb_fields +
info->display_picture_2nd->nb_fields) * mpeg2dec->frame_period / 2;
} else {
GST_BUFFER_DURATION (outbuf) =
picture->nb_fields * mpeg2dec->frame_period / 2;
}
mpeg2dec->next_time += GST_BUFFER_DURATION (outbuf);
if (!(picture->flags & PIC_FLAG_PROGRESSIVE_FRAME))
GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_INTERLACED);
if (picture->flags & PIC_FLAG_TOP_FIELD_FIRST)
GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_TFF);
#if MPEG2_RELEASE >= MPEG2_VERSION(0,5,0)
/* repeat field introduced in 0.5.0 */
if (picture->flags & PIC_FLAG_REPEAT_FIRST_FIELD)
GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_FLAG_RFF);
#endif
GST_DEBUG_OBJECT (mpeg2dec,
"picture: %s %s %s %s %s fields:%d off:%" G_GINT64_FORMAT " ts:%"
GST_TIME_FORMAT,
(picture->flags & PIC_FLAG_PROGRESSIVE_FRAME ? "prog" : " "),
(picture->flags & PIC_FLAG_TOP_FIELD_FIRST ? "tff" : " "),
#if MPEG2_RELEASE >= MPEG2_VERSION(0,5,0)
(picture->flags & PIC_FLAG_REPEAT_FIRST_FIELD ? "rff" : " "),
#else
"unknown rff",
#endif
(picture->flags & PIC_FLAG_SKIP ? "skip" : " "),
(picture->flags & PIC_FLAG_COMPOSITE_DISPLAY ? "composite" : " "),
picture->nb_fields, GST_BUFFER_OFFSET (outbuf),
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)));
if (picture->flags & PIC_FLAG_SKIP)
goto skip;
if (mpeg2dec->discont_state != MPEG2DEC_DISC_NONE)
goto drop;
/* check for clipping */
if (!clip_buffer (mpeg2dec, outbuf))
goto clipped;
if (GST_CLOCK_TIME_IS_VALID (time)) {
gboolean need_skip;
GstClockTime qostime;
/* qos needs to be done on running time */
qostime = gst_segment_to_running_time (&mpeg2dec->segment, GST_FORMAT_TIME,
time);
GST_OBJECT_LOCK (mpeg2dec);
/* check for QoS, don't perform the last steps of getting and
* pushing the buffers that are known to be late. */
/* FIXME, we can also entirely skip decoding if the next valid buffer is
* known to be after a keyframe (using the granule_shift) */
need_skip = mpeg2dec->earliest_time != -1
&& qostime <= mpeg2dec->earliest_time;
GST_OBJECT_UNLOCK (mpeg2dec);
if (need_skip) {
GstMessage *qos_msg;
guint64 stream_time;
gint64 jitter;
mpeg2dec->dropped++;
stream_time =
gst_segment_to_stream_time (&mpeg2dec->segment, GST_FORMAT_TIME,
time);
jitter = GST_CLOCK_DIFF (qostime, mpeg2dec->earliest_time);
qos_msg =
gst_message_new_qos (GST_OBJECT_CAST (mpeg2dec), FALSE, qostime,
stream_time, time, GST_BUFFER_DURATION (outbuf));
gst_message_set_qos_values (qos_msg, jitter, mpeg2dec->proportion,
1000000);
gst_message_set_qos_stats (qos_msg, GST_FORMAT_BUFFERS,
mpeg2dec->processed, mpeg2dec->dropped);
gst_element_post_message (GST_ELEMENT_CAST (mpeg2dec), qos_msg);
goto dropping_qos;
}
}
mpeg2dec->processed++;
/* ref before pushing it out, so we still have the ref in our
* array of buffers */
gst_buffer_ref (outbuf);
if (mpeg2dec->use_cropping) {
GstVideoCropMeta *crop;
crop = gst_buffer_add_video_crop_meta (outbuf);
/* we can do things slightly more efficient when we know that
* downstream understands clipping */
crop->x = 0;
crop->y = 0;
crop->width = mpeg2dec->width;
crop->height = mpeg2dec->height;
}
#if 0
/* do cropping if the target region is smaller than the input one */
if (mpeg2dec->decoded_width != mpeg2dec->width ||
mpeg2dec->decoded_height != mpeg2dec->height) {
GST_DEBUG_OBJECT (mpeg2dec, "cropping buffer");
ret = gst_mpeg2dec_crop_buffer (mpeg2dec, &outbuf);
if (ret != GST_FLOW_OK)
goto done;
}
#endif
if (mpeg2dec->segment.rate >= 0.0) {
/* forward: push right away */
GST_LOG_OBJECT (mpeg2dec, "pushing buffer %p, timestamp %"
GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
outbuf,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (outbuf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (outbuf)));
GST_LOG_OBJECT (mpeg2dec, "... with flags %x", GST_BUFFER_FLAGS (outbuf));
ret = gst_pad_push (mpeg2dec->srcpad, outbuf);
GST_DEBUG_OBJECT (mpeg2dec, "pushed with result %s",
gst_flow_get_name (ret));
} else {
/* reverse: queue, we'll push in reverse when we receive the next (previous)
* keyframe. */
GST_DEBUG_OBJECT (mpeg2dec, "queued frame");
mpeg2dec->queued = g_list_prepend (mpeg2dec->queued, outbuf);
ret = GST_FLOW_OK;
}
return ret;
/* special cases */
no_display:
{
GST_DEBUG_OBJECT (mpeg2dec, "no picture to display");
return GST_FLOW_OK;
}
skip:
{
GST_DEBUG_OBJECT (mpeg2dec, "dropping buffer because of skip flag");
return GST_FLOW_OK;
}
drop:
{
GST_DEBUG_OBJECT (mpeg2dec, "dropping buffer, discont state %d",
mpeg2dec->discont_state);
return GST_FLOW_OK;
}
clipped:
{
GST_DEBUG_OBJECT (mpeg2dec, "dropping buffer, clipped");
return GST_FLOW_OK;
}
dropping_qos:
{
GST_DEBUG_OBJECT (mpeg2dec, "dropping buffer because of QoS");
return GST_FLOW_OK;
}
}
static GstFlowReturn
gst_mpeg2dec_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstMpeg2dec *mpeg2dec;
gsize size;
guint8 *data, *end;
GstClockTime pts;
const mpeg2_info_t *info;
mpeg2_state_t state;
gboolean done = FALSE;
GstFlowReturn ret = GST_FLOW_OK;
mpeg2dec = GST_MPEG2DEC (parent);
data = gst_buffer_map (buf, &size, NULL, GST_MAP_READ);
pts = GST_BUFFER_TIMESTAMP (buf);
if (GST_BUFFER_IS_DISCONT (buf)) {
GST_LOG_OBJECT (mpeg2dec, "DISCONT, reset decoder");
/* when we receive a discont, reset our state as to not create too much
* distortion in the picture due to missing packets */
mpeg2_reset (mpeg2dec->decoder, 0);
mpeg2_skip (mpeg2dec->decoder, 1);
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
}
GST_LOG_OBJECT (mpeg2dec, "received buffer, timestamp %"
GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buf)));
info = mpeg2dec->info;
end = data + size;
mpeg2dec->offset = GST_BUFFER_OFFSET (buf);
if (pts != GST_CLOCK_TIME_NONE) {
gint64 mpeg_pts = GST_TIME_TO_MPEG_TIME (pts);
GST_DEBUG_OBJECT (mpeg2dec,
"have pts: %" G_GINT64_FORMAT " (%" GST_TIME_FORMAT ")",
mpeg_pts, GST_TIME_ARGS (MPEG_TIME_TO_GST_TIME (mpeg_pts)));
#if MPEG2_RELEASE >= MPEG2_VERSION(0,4,0)
mpeg2_tag_picture (mpeg2dec->decoder, mpeg_pts & 0xffffffff,
mpeg_pts >> 32);
#else
mpeg2_pts (mpeg2dec->decoder, mpeg_pts);
#endif
} else {
GST_LOG ("no pts");
}
GST_LOG_OBJECT (mpeg2dec, "calling mpeg2_buffer");
mpeg2_buffer (mpeg2dec->decoder, data, end);
GST_LOG_OBJECT (mpeg2dec, "calling mpeg2_buffer done");
while (!done) {
GST_LOG_OBJECT (mpeg2dec, "calling parse");
state = mpeg2_parse (mpeg2dec->decoder);
GST_DEBUG_OBJECT (mpeg2dec, "parse state %d", state);
switch (state) {
#if MPEG2_RELEASE >= MPEG2_VERSION (0, 5, 0)
case STATE_SEQUENCE_MODIFIED:
GST_DEBUG_OBJECT (mpeg2dec, "sequence modified");
/* fall through */
#endif
case STATE_SEQUENCE:
ret = handle_sequence (mpeg2dec, info);
/* if there is an error handling the sequence
* reset the decoder, maybe something more elegant
* could be done.
*/
if (ret == GST_FLOW_ERROR) {
mpeg2dec->error_count++;
GST_WARNING_OBJECT (mpeg2dec, "Decoding error #%d",
mpeg2dec->error_count);
if (mpeg2dec->error_count >= WARN_THRESHOLD && WARN_THRESHOLD > 0) {
GST_ELEMENT_WARNING (mpeg2dec, STREAM, DECODE,
("%d consecutive decoding errors", mpeg2dec->error_count),
(NULL));
}
mpeg2_reset (mpeg2dec->decoder, 0);
mpeg2_skip (mpeg2dec->decoder, 1);
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
goto exit;
}
break;
case STATE_SEQUENCE_REPEATED:
GST_DEBUG_OBJECT (mpeg2dec, "sequence repeated");
break;
case STATE_GOP:
GST_DEBUG_OBJECT (mpeg2dec, "gop");
break;
case STATE_PICTURE:
ret = handle_picture (mpeg2dec, info);
break;
case STATE_SLICE_1ST:
GST_LOG_OBJECT (mpeg2dec, "1st slice of frame encountered");
break;
case STATE_PICTURE_2ND:
GST_LOG_OBJECT (mpeg2dec,
"Second picture header encountered. Decoding 2nd field");
break;
#if MPEG2_RELEASE >= MPEG2_VERSION (0, 4, 0)
case STATE_INVALID_END:
GST_DEBUG_OBJECT (mpeg2dec, "invalid end");
#endif
case STATE_END:
GST_DEBUG_OBJECT (mpeg2dec, "end");
mpeg2dec->need_sequence = TRUE;
case STATE_SLICE:
ret = handle_slice (mpeg2dec, info);
break;
case STATE_BUFFER:
done = TRUE;
break;
/* error */
case STATE_INVALID:
/* FIXME: at some point we should probably send newsegment events to
* let downstream know that parts of the stream are missing */
mpeg2dec->error_count++;
GST_WARNING_OBJECT (mpeg2dec, "Decoding error #%d",
mpeg2dec->error_count);
if (mpeg2dec->error_count >= WARN_THRESHOLD && WARN_THRESHOLD > 0) {
GST_ELEMENT_WARNING (mpeg2dec, STREAM, DECODE,
("%d consecutive decoding errors", mpeg2dec->error_count),
(NULL));
}
continue;
default:
GST_ERROR_OBJECT (mpeg2dec, "Unknown libmpeg2 state %d, FIXME", state);
goto exit;
}
mpeg2dec->error_count = 0;
/*
* FIXME: should pass more information such as state the user data is from
*/
#ifdef enable_user_data
if (info->user_data_len > 0) {
GstBuffer *udbuf = gst_buffer_new_allocate (NULL, info->user_data_len, 0);
gst_buffer_fill (udbuf, 0, info->user_data, info->user_data_len);
gst_pad_push (mpeg2dec->userdatapad, udbuf);
}
#endif
if (ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (mpeg2dec, "exit loop, reason %s",
gst_flow_get_name (ret));
break;
}
}
done:
gst_buffer_unmap (buf, data, size);
gst_buffer_unref (buf);
return ret;
/* errors */
exit:
{
ret = GST_FLOW_OK;
goto done;
}
}
static gboolean
gst_mpeg2dec_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
GstMpeg2dec *mpeg2dec;
gboolean ret = TRUE;
mpeg2dec = GST_MPEG2DEC (parent);
GST_DEBUG_OBJECT (mpeg2dec, "Got %s event on sink pad",
GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
ret = gst_mpeg2dec_setcaps (pad, caps);
gst_event_unref (event);
break;
}
case GST_EVENT_SEGMENT:
{
GstSegment seg;
gst_event_copy_segment (event, &seg);
/* we need TIME */
if (seg.format != GST_FORMAT_TIME)
goto newseg_wrong_format;
/* now configure the values */
mpeg2dec->segment = seg;
GST_DEBUG_OBJECT (mpeg2dec, "Pushing seg %" GST_SEGMENT_FORMAT, &seg);
ret = gst_pad_push_event (mpeg2dec->srcpad, event);
break;
}
case GST_EVENT_FLUSH_START:
ret = gst_pad_push_event (mpeg2dec->srcpad, event);
break;
case GST_EVENT_FLUSH_STOP:
{
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
mpeg2dec->next_time = -1;;
gst_mpeg2dec_qos_reset (mpeg2dec);
mpeg2_reset (mpeg2dec->decoder, 0);
mpeg2_skip (mpeg2dec->decoder, 1);
clear_queued (mpeg2dec);
ret = gst_pad_push_event (mpeg2dec->srcpad, event);
break;
}
case GST_EVENT_EOS:
ret = gst_pad_push_event (mpeg2dec->srcpad, event);
break;
default:
ret = gst_pad_push_event (mpeg2dec->srcpad, event);
break;
}
done:
return ret;
/* ERRORS */
newseg_wrong_format:
{
GST_DEBUG_OBJECT (mpeg2dec, "received non TIME newsegment");
gst_event_unref (event);
goto done;
}
}
static gboolean
gst_mpeg2dec_setcaps (GstPad * pad, GstCaps * caps)
{
GstMpeg2dec *mpeg2dec;
GstStructure *s;
mpeg2dec = GST_MPEG2DEC (gst_pad_get_parent (pad));
s = gst_caps_get_structure (caps, 0);
/* parse the par, this overrides the encoded par */
mpeg2dec->have_par = gst_structure_get_fraction (s, "pixel-aspect-ratio",
&mpeg2dec->in_par_n, &mpeg2dec->in_par_d);
gst_object_unref (mpeg2dec);
return TRUE;
}
static gboolean
gst_mpeg2dec_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
{
gboolean res;
GstMpeg2dec *mpeg2dec;
mpeg2dec = GST_MPEG2DEC (parent);
if (mpeg2dec->decoder == NULL)
goto no_decoder;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_QOS:
{
GstQOSType type;
gdouble proportion;
GstClockTimeDiff diff;
GstClockTime timestamp;
gst_event_parse_qos (event, &type, &proportion, &diff, &timestamp);
GST_OBJECT_LOCK (mpeg2dec);
mpeg2dec->proportion = proportion;
mpeg2dec->earliest_time = timestamp + diff;
GST_OBJECT_UNLOCK (mpeg2dec);
GST_DEBUG_OBJECT (mpeg2dec,
"got QoS %" GST_TIME_FORMAT ", %" G_GINT64_FORMAT,
GST_TIME_ARGS (timestamp), diff);
res = gst_pad_push_event (mpeg2dec->sinkpad, event);
break;
}
case GST_EVENT_SEEK:
case GST_EVENT_NAVIGATION:
/* Forward unchanged */
default:
res = gst_pad_push_event (mpeg2dec->sinkpad, event);
break;
}
return res;
no_decoder:
{
GST_DEBUG_OBJECT (mpeg2dec, "no decoder, cannot handle event");
gst_event_unref (event);
return FALSE;
}
}
static GstStateChangeReturn
gst_mpeg2dec_change_state (GstElement * element, GstStateChange transition)
{
GstStateChangeReturn ret;
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
mpeg2_accel (MPEG2_ACCEL_DETECT);
if ((mpeg2dec->decoder = mpeg2_init ()) == NULL)
goto init_failed;
mpeg2dec->info = mpeg2_info (mpeg2dec->decoder);
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
gst_mpeg2dec_reset (mpeg2dec);
gst_mpeg2dec_qos_reset (mpeg2dec);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
default:
break;
}
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
gst_mpeg2dec_qos_reset (mpeg2dec);
clear_queued (mpeg2dec);
if (mpeg2dec->pool) {
gst_buffer_pool_set_active (mpeg2dec->pool, FALSE);
gst_object_unref (mpeg2dec->pool);
mpeg2dec->pool = NULL;
}
break;
case GST_STATE_CHANGE_READY_TO_NULL:
if (mpeg2dec->decoder) {
mpeg2_close (mpeg2dec->decoder);
mpeg2dec->decoder = NULL;
mpeg2dec->info = NULL;
}
clear_buffers (mpeg2dec);
break;
default:
break;
}
return ret;
/* ERRORS */
init_failed:
{
GST_ELEMENT_ERROR (mpeg2dec, LIBRARY, INIT,
(NULL), ("Failed to initialize libmpeg2 library"));
return GST_STATE_CHANGE_FAILURE;
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
if (!gst_element_register (plugin, "mpeg2dec", GST_RANK_PRIMARY,
GST_TYPE_MPEG2DEC))
return FALSE;
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"mpeg2dec",
"LibMpeg2 decoder", plugin_init, VERSION, "GPL", GST_PACKAGE_NAME,
GST_PACKAGE_ORIGIN);
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