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gstreamer/ext/mpeg2dec/gstmpeg2dec.c
Tim-Philipp Müller 9a2de96836 mpeg2dec: use gst_pad_alloc_buffer() when cropping buffers
2010-12-29 22:17:50 +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-yuv, "
"format = (fourcc) { YV12, I420, Y42B, Y444 }, "
"width = (int) [ 16, 4096 ], "
"height = (int) [ 16, 4096 ], "
"framerate = (fraction) [ 0/1, 2147483647/1 ]")
);
static void gst_mpeg2dec_base_init (gpointer g_class);
static void gst_mpeg2dec_class_init (GstMpeg2decClass * klass);
static void gst_mpeg2dec_init (GstMpeg2dec * mpeg2dec);
static void gst_mpeg2dec_finalize (GObject * object);
static void gst_mpeg2dec_reset (GstMpeg2dec * mpeg2dec);
#ifndef GST_DISABLE_INDEX
static void gst_mpeg2dec_set_index (GstElement * element, GstIndex * index);
static GstIndex *gst_mpeg2dec_get_index (GstElement * element);
#endif
static gboolean gst_mpeg2dec_src_event (GstPad * pad, GstEvent * event);
static const GstQueryType *gst_mpeg2dec_get_src_query_types (GstPad * pad);
static gboolean gst_mpeg2dec_src_query (GstPad * pad, GstQuery * query);
static gboolean gst_mpeg2dec_sink_convert (GstPad * pad, GstFormat src_format,
gint64 src_value, GstFormat * dest_format, gint64 * dest_value);
static gboolean gst_mpeg2dec_src_convert (GstPad * pad, GstFormat src_format,
gint64 src_value, GstFormat * dest_format, gint64 * dest_value);
static GstStateChangeReturn gst_mpeg2dec_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_mpeg2dec_sink_event (GstPad * pad, GstEvent * event);
static gboolean gst_mpeg2dec_setcaps (GstPad * pad, GstCaps * caps);
static GstFlowReturn gst_mpeg2dec_chain (GstPad * pad, GstBuffer * buf);
static void clear_buffers (GstMpeg2dec * mpeg2dec);
//static gboolean gst_mpeg2dec_sink_query (GstPad * pad, 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
static GstElementClass *parent_class = NULL;
static gboolean gst_mpeg2dec_crop_buffer (GstMpeg2dec * dec, GstBuffer ** buf);
/*static guint gst_mpeg2dec_signals[LAST_SIGNAL] = { 0 };*/
GType
gst_mpeg2dec_get_type (void)
{
static GType mpeg2dec_type = 0;
if (!mpeg2dec_type) {
static const GTypeInfo mpeg2dec_info = {
sizeof (GstMpeg2decClass),
gst_mpeg2dec_base_init,
NULL,
(GClassInitFunc) gst_mpeg2dec_class_init,
NULL,
NULL,
sizeof (GstMpeg2dec),
0,
(GInstanceInitFunc) gst_mpeg2dec_init,
};
mpeg2dec_type =
g_type_register_static (GST_TYPE_ELEMENT, "GstMpeg2dec", &mpeg2dec_info,
0);
}
GST_DEBUG_CATEGORY_INIT (mpeg2dec_debug, "mpeg2dec", 0,
"MPEG2 decoder element");
return mpeg2dec_type;
}
static void
gst_mpeg2dec_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&src_template_factory));
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&sink_template_factory));
#ifdef enable_user_data
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&user_data_template_factory));
#endif
gst_element_class_set_details_simple (element_class,
"mpeg1 and mpeg2 video decoder", "Codec/Decoder/Video",
"Uses libmpeg2 to decode MPEG video streams",
"Wim Taymans <wim.taymans@chello.be>");
}
static void
gst_mpeg2dec_class_init (GstMpeg2decClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = gst_mpeg2dec_finalize;
gstelement_class->change_state = gst_mpeg2dec_change_state;
#ifndef GST_DISABLE_INDEX
gstelement_class->set_index = gst_mpeg2dec_set_index;
gstelement_class->get_index = gst_mpeg2dec_get_index;
#endif
}
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_pad_set_setcaps_function (mpeg2dec->sinkpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_setcaps));
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));
gst_pad_set_query_type_function (mpeg2dec->srcpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_get_src_query_types));
gst_pad_set_query_function (mpeg2dec->srcpad,
GST_DEBUG_FUNCPTR (gst_mpeg2dec_src_query));
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->index) {
gst_object_unref (mpeg2dec->index);
mpeg2dec->index = NULL;
mpeg2dec->index_id = 0;
}
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)
{
if (mpeg2dec->index) {
gst_object_unref (mpeg2dec->index);
mpeg2dec->index = NULL;
mpeg2dec->index_id = 0;
}
/* reset the initial video state */
mpeg2dec->format = GST_VIDEO_FORMAT_UNKNOWN;
mpeg2dec->width = -1;
mpeg2dec->height = -1;
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;
GST_OBJECT_UNLOCK (mpeg2dec);
}
#ifndef GST_DISABLE_INDEX
static void
gst_mpeg2dec_set_index (GstElement * element, GstIndex * index)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (element);
GST_OBJECT_LOCK (mpeg2dec);
if (mpeg2dec->index)
gst_object_unref (mpeg2dec->index);
mpeg2dec->index = NULL;
mpeg2dec->index_id = 0;
if (index) {
mpeg2dec->index = gst_object_ref (index);
gst_index_get_writer_id (index, GST_OBJECT (element), &mpeg2dec->index_id);
}
GST_OBJECT_UNLOCK (mpeg2dec);
}
static GstIndex *
gst_mpeg2dec_get_index (GstElement * element)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (element);
return (mpeg2dec->index) ? gst_object_ref (mpeg2dec->index) : NULL;
}
#endif
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_width (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_set_caps (outbuf, GST_PAD_CAPS (dec->srcpad));
gst_buffer_copy_metadata (outbuf, inbuf,
GST_BUFFER_COPY_TIMESTAMPS | GST_BUFFER_COPY_FLAGS);
gst_buffer_unref (*buf);
*buf = outbuf;
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mpeg2dec_alloc_sized_buf (GstMpeg2dec * mpeg2dec, guint size,
GstBuffer ** obuf)
{
if (mpeg2dec->can_allocate_aligned
&& mpeg2dec->decoded_width == mpeg2dec->width
&& mpeg2dec->decoded_height == mpeg2dec->height) {
GstFlowReturn ret;
ret = gst_pad_alloc_buffer_and_set_caps (mpeg2dec->srcpad,
GST_BUFFER_OFFSET_NONE, size, GST_PAD_CAPS (mpeg2dec->srcpad), obuf);
if (ret != GST_FLOW_OK) {
return ret;
}
/* libmpeg2 needs 16 byte aligned buffers... test for this here
* and if it fails only a single time create our own buffers from
* there on below that are correctly aligned */
if (((uintptr_t) GST_BUFFER_DATA (*obuf)) % 16 == 0) {
GST_LOG_OBJECT (mpeg2dec, "return 16 byte aligned buffer");
return ret;
}
GST_DEBUG_OBJECT (mpeg2dec,
"can't get 16 byte aligned buffers, creating our own ones");
gst_buffer_unref (*obuf);
mpeg2dec->can_allocate_aligned = FALSE;
}
/* can't use gst_pad_alloc_buffer() here because the output buffer will
* either be cropped later or be bigger than expected (for the alignment),
* and basetransform-based elements will complain about the wrong unit size
* when not operating in passthrough mode */
*obuf = gst_buffer_new_and_alloc (size + 15);
GST_BUFFER_DATA (*obuf) = (guint8 *) ALIGN_16 (GST_BUFFER_DATA (*obuf));
GST_BUFFER_SIZE (*obuf) = size;
gst_buffer_set_caps (*obuf, GST_PAD_CAPS (mpeg2dec->srcpad));
return GST_FLOW_OK;
}
static GstFlowReturn
gst_mpeg2dec_alloc_buffer (GstMpeg2dec * mpeg2dec, gint64 offset,
GstBuffer ** obuf)
{
GstBuffer *outbuf = NULL;
guint8 *buf[3];
GstFlowReturn ret = GST_FLOW_OK;
ret = gst_mpeg2dec_alloc_sized_buf (mpeg2dec, mpeg2dec->size, &outbuf);
if (ret != GST_FLOW_OK)
goto no_buffer;
buf[0] = GST_BUFFER_DATA (outbuf);
buf[1] = buf[0] + mpeg2dec->u_offs;
buf[2] = buf[0] + mpeg2dec->v_offs;
GST_DEBUG_OBJECT (mpeg2dec, "set_buf: %p %p %p, outbuf %p",
buf[0], buf[1], buf[2], outbuf);
mpeg2_set_buf (mpeg2dec->decoder, buf, outbuf);
/* we store the original byteoffset of this picture in the stream here
* because we need it for indexing */
GST_BUFFER_OFFSET (outbuf) = offset;
*obuf = outbuf;
return ret;
/* ERRORS */
no_buffer:
{
if (ret != GST_FLOW_WRONG_STATE && ret != GST_FLOW_UNEXPECTED) {
GST_ELEMENT_ERROR (mpeg2dec, RESOURCE, FAILED, (NULL),
("Failed to allocate memory for buffer, reason %s",
gst_flow_get_name (ret)));
}
GST_DEBUG_OBJECT (mpeg2dec, "no output buffer, reason %s",
gst_flow_get_name (ret));
mpeg2_set_buf (mpeg2dec->decoder, mpeg2dec->dummybuf, NULL);
*obuf = NULL;
return ret;
}
}
static gboolean
gst_mpeg2dec_negotiate_format (GstMpeg2dec * mpeg2dec)
{
GstCaps *caps;
guint32 fourcc;
const mpeg2_info_t *info;
const mpeg2_sequence_t *sequence;
info = mpeg2_info (mpeg2dec->decoder);
sequence = info->sequence;
if (sequence->width != sequence->chroma_width &&
sequence->height != sequence->chroma_height) {
mpeg2dec->format = GST_VIDEO_FORMAT_I420;
} else if ((sequence->width == sequence->chroma_width &&
sequence->height != sequence->chroma_height) ||
(sequence->width != sequence->chroma_width &&
sequence->height == sequence->chroma_height)) {
mpeg2dec->format = GST_VIDEO_FORMAT_Y42B;
} else {
mpeg2dec->format = GST_VIDEO_FORMAT_Y444;
}
fourcc = gst_video_format_to_fourcc (mpeg2dec->format);
mpeg2dec->size = gst_video_format_get_size (mpeg2dec->format,
mpeg2dec->decoded_width, mpeg2dec->decoded_height);
mpeg2dec->u_offs = gst_video_format_get_component_offset (mpeg2dec->format, 1,
mpeg2dec->decoded_width, mpeg2dec->decoded_height);
mpeg2dec->v_offs = gst_video_format_get_component_offset (mpeg2dec->format, 2,
mpeg2dec->decoded_width, mpeg2dec->decoded_height);
if (mpeg2dec->pixel_width == 0 || mpeg2dec->pixel_height == 0) {
GValue par = { 0, };
GValue dar = { 0, };
GValue dimensions = { 0, };
/* assume display aspect ratio (DAR) of 4:3 */
g_value_init (&dar, GST_TYPE_FRACTION);
gst_value_set_fraction (&dar, 4, 3);
g_value_init (&dimensions, GST_TYPE_FRACTION);
gst_value_set_fraction (&dimensions, mpeg2dec->height, mpeg2dec->width);
g_value_init (&par, GST_TYPE_FRACTION);
if (!gst_value_fraction_multiply (&par, &dar, &dimensions)) {
gst_value_set_fraction (&dimensions, 1, 1);
}
mpeg2dec->pixel_width = gst_value_get_fraction_numerator (&par);
mpeg2dec->pixel_height = gst_value_get_fraction_denominator (&par);
GST_WARNING_OBJECT (mpeg2dec, "Unknown pixel-aspect-ratio, assuming %d:%d",
mpeg2dec->pixel_width, mpeg2dec->pixel_height);
g_value_unset (&par);
g_value_unset (&dar);
g_value_unset (&dimensions);
}
caps = gst_caps_new_simple ("video/x-raw-yuv",
"format", GST_TYPE_FOURCC, fourcc,
"width", G_TYPE_INT, mpeg2dec->width,
"height", G_TYPE_INT, mpeg2dec->height,
"pixel-aspect-ratio", GST_TYPE_FRACTION, mpeg2dec->pixel_width,
mpeg2dec->pixel_height,
"framerate", GST_TYPE_FRACTION, mpeg2dec->fps_n, mpeg2dec->fps_d,
"interlaced", G_TYPE_BOOLEAN, mpeg2dec->interlaced, NULL);
gst_pad_set_caps (mpeg2dec->srcpad, caps);
gst_caps_unref (caps);
return TRUE;
}
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;
if (info->sequence->frame_period == 0) {
GST_WARNING_OBJECT (mpeg2dec, "Frame period is 0!");
ret = GST_FLOW_ERROR;
goto done;
}
mpeg2dec->width = info->sequence->picture_width;
mpeg2dec->height = info->sequence->picture_height;
mpeg2dec->decoded_width = info->sequence->width;
mpeg2dec->decoded_height = info->sequence->height;
mpeg2dec->total_frames = 0;
/* don't take the sequence PAR if we already have one from the sink caps */
if (!mpeg2dec->have_par) {
mpeg2dec->pixel_width = info->sequence->pixel_width;
mpeg2dec->pixel_height = info->sequence->pixel_height;
}
/* mpeg2 video can only be from 16x16 to 4096x4096. Everything
* else is a corrupted files */
if (mpeg2dec->width > 4096 || mpeg2dec->width < 16 ||
mpeg2dec->height > 4096 || mpeg2dec->height < 16) {
GST_ERROR_OBJECT (mpeg2dec, "Invalid frame dimensions: %d x %d",
mpeg2dec->width, mpeg2dec->height);
return GST_FLOW_ERROR;
}
/* set framerate */
mpeg2dec->fps_n = 27000000;
mpeg2dec->fps_d = info->sequence->frame_period;
mpeg2dec->frame_period = info->sequence->frame_period * GST_USECOND / 27;
mpeg2dec->interlaced =
!(info->sequence->flags & SEQ_FLAG_PROGRESSIVE_SEQUENCE);
GST_DEBUG_OBJECT (mpeg2dec,
"sequence flags: %d, frame period: %d (%g), frame rate: %d/%d",
info->sequence->flags, info->sequence->frame_period,
(double) (mpeg2dec->frame_period) / GST_SECOND, mpeg2dec->fps_n,
mpeg2dec->fps_d);
GST_DEBUG_OBJECT (mpeg2dec, "profile: %02x, colour_primaries: %d",
info->sequence->profile_level_id, info->sequence->colour_primaries);
GST_DEBUG_OBJECT (mpeg2dec, "transfer chars: %d, matrix coef: %d",
info->sequence->transfer_characteristics,
info->sequence->matrix_coefficients);
GST_DEBUG_OBJECT (mpeg2dec,
"FLAGS: CONSTRAINED_PARAMETERS:%d, PROGRESSIVE_SEQUENCE:%d",
info->sequence->flags & SEQ_FLAG_CONSTRAINED_PARAMETERS,
info->sequence->flags & SEQ_FLAG_PROGRESSIVE_SEQUENCE);
GST_DEBUG_OBJECT (mpeg2dec, "FLAGS: LOW_DELAY:%d, COLOUR_DESCRIPTION:%d",
info->sequence->flags & SEQ_FLAG_LOW_DELAY,
info->sequence->flags & SEQ_FLAG_COLOUR_DESCRIPTION);
if (!gst_mpeg2dec_negotiate_format (mpeg2dec))
goto negotiate_failed;
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;
negotiate_failed:
{
GST_ELEMENT_ERROR (mpeg2dec, CORE, NEGOTIATION, (NULL), (NULL));
ret = GST_FLOW_NOT_NEGOTIATED;
goto done;
}
}
static void
clear_buffers (GstMpeg2dec * mpeg2dec)
{
gint i;
GstBuffer **bufpen;
for (i = 0; i < 4; i++) {
bufpen = &mpeg2dec->ip_buffers[i];
if (*bufpen)
gst_buffer_unref (*bufpen);
*bufpen = NULL;
}
bufpen = &mpeg2dec->b_buffer;
if (*bufpen)
gst_buffer_unref (*bufpen);
*bufpen = 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, **bufpen;
GstFlowReturn ret;
gint type;
ret = gst_mpeg2dec_alloc_buffer (mpeg2dec, mpeg2dec->offset, &outbuf);
if (ret != GST_FLOW_OK)
goto no_buffer;
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);
}
case PIC_FLAG_CODING_TYPE_P:
bufpen = &mpeg2dec->ip_buffers[mpeg2dec->ip_bufpos];
GST_DEBUG_OBJECT (mpeg2dec, "I/P unref %p, ref %p", *bufpen, outbuf);
if (*bufpen)
gst_buffer_unref (*bufpen);
*bufpen = outbuf;
mpeg2dec->ip_bufpos = (mpeg2dec->ip_bufpos + 1) & 3;
break;
case PIC_FLAG_CODING_TYPE_B:
bufpen = &mpeg2dec->b_buffer;
GST_DEBUG_OBJECT (mpeg2dec, "B unref %p, ref %p", *bufpen, outbuf);
if (*bufpen)
gst_buffer_unref (*bufpen);
*bufpen = outbuf;
break;
default:
break;
}
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;
}
}
/* 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;
gint64 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;
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;
outbuf = GST_BUFFER (info->display_fbuf->id);
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_TOP_FIELD_FIRST)
GST_BUFFER_FLAG_SET (outbuf, GST_VIDEO_BUFFER_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_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)));
#ifndef GST_DISABLE_INDEX
if (mpeg2dec->index) {
gst_index_add_association (mpeg2dec->index, mpeg2dec->index_id,
(key_frame ? GST_ASSOCIATION_FLAG_KEY_UNIT : 0),
GST_FORMAT_BYTES, GST_BUFFER_OFFSET (outbuf),
GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (outbuf), 0);
}
#endif
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)
goto dropping_qos;
}
/* ref before pushing it out, so we still have the ref in our
* array of buffers */
gst_buffer_ref (outbuf);
/* 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;
}
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;
}
done:
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;
}
}
#if 0
static void
update_streaminfo (GstMpeg2dec * mpeg2dec)
{
GstCaps *caps;
GstProps *props;
GstPropsEntry *entry;
const mpeg2_info_t *info;
info = mpeg2_info (mpeg2dec->decoder);
props = gst_props_empty_new ();
entry =
gst_props_entry_new ("framerate",
G_TYPE_DOUBLE (GST_SECOND / (float) mpeg2dec->frame_period));
gst_props_add_entry (props, entry);
entry =
gst_props_entry_new ("bitrate",
G_TYPE_INT (info->sequence->byte_rate * 8));
gst_props_add_entry (props, entry);
caps = gst_caps_new ("mpeg2dec_streaminfo",
"application/x-gst-streaminfo", props);
gst_caps_replace_sink (&mpeg2dec->streaminfo, caps);
g_object_notify (G_OBJECT (mpeg2dec), "streaminfo");
}
#endif
static GstFlowReturn
gst_mpeg2dec_chain (GstPad * pad, GstBuffer * buf)
{
GstMpeg2dec *mpeg2dec;
guint32 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 (GST_PAD_PARENT (pad));
size = GST_BUFFER_SIZE (buf);
data = GST_BUFFER_DATA (buf);
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));
}
goto exit;
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_and_alloc (info->user_data_len);
memcpy (GST_BUFFER_DATA (udbuf), 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_unref (buf);
return ret;
/* errors */
exit:
{
ret = GST_FLOW_OK;
goto done;
}
}
static gboolean
gst_mpeg2dec_sink_event (GstPad * pad, GstEvent * event)
{
GstMpeg2dec *mpeg2dec;
gboolean ret = TRUE;
mpeg2dec = GST_MPEG2DEC (gst_pad_get_parent (pad));
GST_DEBUG_OBJECT (mpeg2dec, "Got %s event on sink pad",
GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_NEWSEGMENT:
{
gboolean update;
GstFormat format;
gdouble rate, arate;
gint64 start, stop, time;
gst_event_parse_new_segment_full (event, &update, &rate, &arate, &format,
&start, &stop, &time);
/* we need TIME and a positive rate */
if (format != GST_FORMAT_TIME)
goto newseg_wrong_format;
/* now configure the values */
gst_segment_set_newsegment_full (&mpeg2dec->segment, update,
rate, arate, format, start, stop, time);
GST_DEBUG_OBJECT (mpeg2dec,
"Pushing newseg rate %g, applied rate %g, format %d, start %"
G_GINT64_FORMAT ", stop %" G_GINT64_FORMAT ", pos %" G_GINT64_FORMAT,
rate, arate, format, start, stop, time);
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:
#ifndef GST_DISABLE_INDEX
if (mpeg2dec->index && mpeg2dec->closed) {
gst_index_commit (mpeg2dec->index, mpeg2dec->index_id);
}
#endif
ret = gst_pad_push_event (mpeg2dec->srcpad, event);
break;
default:
ret = gst_pad_push_event (mpeg2dec->srcpad, event);
break;
}
done:
gst_object_unref (mpeg2dec);
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->pixel_width, &mpeg2dec->pixel_height);
gst_object_unref (mpeg2dec);
return TRUE;
}
static gboolean
gst_mpeg2dec_sink_convert (GstPad * pad, GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = TRUE;
GstMpeg2dec *mpeg2dec;
const mpeg2_info_t *info;
mpeg2dec = GST_MPEG2DEC (GST_PAD_PARENT (pad));
if (mpeg2dec->decoder == NULL)
return FALSE;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
info = mpeg2_info (mpeg2dec->decoder);
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_TIME:
if (info->sequence && info->sequence->byte_rate) {
*dest_value =
gst_util_uint64_scale (GST_SECOND, src_value,
info->sequence->byte_rate);
GST_WARNING_OBJECT (mpeg2dec, "dest_value:%" GST_TIME_FORMAT,
GST_TIME_ARGS (*dest_value));
break;
} else if (info->sequence)
GST_WARNING_OBJECT (mpeg2dec,
"Cannot convert from BYTES to TIME since we don't know the bitrate at this point.");
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
if (info->sequence && info->sequence->byte_rate) {
*dest_value =
gst_util_uint64_scale_int (src_value, info->sequence->byte_rate,
GST_SECOND);
break;
} else if (info->sequence)
GST_WARNING_OBJECT (mpeg2dec,
"Cannot convert from TIME to BYTES since we don't know the bitrate at this point.");
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
return res;
}
static gboolean
gst_mpeg2dec_src_convert (GstPad * pad, GstFormat src_format, gint64 src_value,
GstFormat * dest_format, gint64 * dest_value)
{
gboolean res = TRUE;
GstMpeg2dec *mpeg2dec;
const mpeg2_info_t *info;
guint64 scale = 1;
mpeg2dec = GST_MPEG2DEC (GST_PAD_PARENT (pad));
if (mpeg2dec->decoder == NULL)
return FALSE;
if (src_format == *dest_format) {
*dest_value = src_value;
return TRUE;
}
info = mpeg2_info (mpeg2dec->decoder);
switch (src_format) {
case GST_FORMAT_BYTES:
switch (*dest_format) {
case GST_FORMAT_TIME:
default:
res = FALSE;
}
break;
case GST_FORMAT_TIME:
switch (*dest_format) {
case GST_FORMAT_BYTES:
scale = 6 * (mpeg2dec->width * mpeg2dec->height >> 2);
case GST_FORMAT_DEFAULT:
if (info->sequence && mpeg2dec->frame_period) {
*dest_value =
gst_util_uint64_scale_int (src_value, scale,
mpeg2dec->frame_period);
break;
}
default:
res = FALSE;
}
break;
case GST_FORMAT_DEFAULT:
switch (*dest_format) {
case GST_FORMAT_TIME:
*dest_value = src_value * mpeg2dec->frame_period;
break;
case GST_FORMAT_BYTES:
*dest_value =
src_value * 6 * ((mpeg2dec->width * mpeg2dec->height) >> 2);
break;
default:
res = FALSE;
}
break;
default:
res = FALSE;
}
return res;
}
static const GstQueryType *
gst_mpeg2dec_get_src_query_types (GstPad * pad)
{
static const GstQueryType types[] = {
GST_QUERY_POSITION,
GST_QUERY_DURATION,
0
};
return types;
}
static gboolean
gst_mpeg2dec_src_query (GstPad * pad, GstQuery * query)
{
gboolean res = TRUE;
GstMpeg2dec *mpeg2dec;
mpeg2dec = GST_MPEG2DEC (GST_PAD_PARENT (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
GstFormat format;
gint64 cur;
/* First, we try to ask upstream, which might know better, especially in
* the case of DVDs, with multiple chapter */
if ((res = gst_pad_peer_query (mpeg2dec->sinkpad, query)))
break;
/* save requested format */
gst_query_parse_position (query, &format, NULL);
/* and convert to the requested format */
if (!gst_mpeg2dec_src_convert (pad, GST_FORMAT_TIME,
mpeg2dec->next_time, &format, &cur))
goto error;
cur = gst_segment_to_stream_time (&mpeg2dec->segment, format, cur);
if (cur == -1)
goto error;
gst_query_set_position (query, format, cur);
GST_LOG_OBJECT (mpeg2dec,
"position query: we return %" G_GUINT64_FORMAT " (format %u)", cur,
format);
break;
}
case GST_QUERY_DURATION:
{
GstFormat format;
GstFormat rformat;
gint64 total, total_bytes;
GstPad *peer;
if ((peer = gst_pad_get_peer (mpeg2dec->sinkpad)) == NULL)
goto error;
/* save requested format */
gst_query_parse_duration (query, &format, NULL);
/* send to peer */
if ((res = gst_pad_query (peer, query))) {
gst_object_unref (peer);
goto done;
} else {
GST_LOG_OBJECT (mpeg2dec, "query on peer pad failed, trying bytes");
}
/* query peer for total length in bytes */
gst_query_set_duration (query, GST_FORMAT_BYTES, -1);
if (!(res = gst_pad_query (peer, query))) {
GST_LOG_OBJECT (mpeg2dec, "query on peer pad failed");
gst_object_unref (peer);
goto error;
}
gst_object_unref (peer);
/* get the returned format */
gst_query_parse_duration (query, &rformat, &total_bytes);
GST_LOG_OBJECT (mpeg2dec,
"peer pad returned total=%" G_GINT64_FORMAT " bytes", total_bytes);
if (total_bytes != -1) {
if (!gst_mpeg2dec_sink_convert (pad, GST_FORMAT_BYTES, total_bytes,
&format, &total))
goto error;
} else {
total = -1;
}
gst_query_set_duration (query, format, total);
GST_LOG_OBJECT (mpeg2dec,
"position query: we return %" G_GUINT64_FORMAT " (format %u)", total,
format);
break;
}
default:
res = gst_pad_query_default (pad, query);
break;
}
done:
return res;
error:
GST_DEBUG ("error handling query");
return FALSE;
}
#if 0
static const GstEventMask *
gst_mpeg2dec_get_event_masks (GstPad * pad)
{
static const GstEventMask masks[] = {
{GST_EVENT_SEEK, GST_SEEK_METHOD_SET | GST_SEEK_FLAG_FLUSH},
{GST_EVENT_NAVIGATION, GST_EVENT_FLAG_NONE},
{0,}
};
return masks;
}
#endif
#ifndef GST_DISABLE_INDEX
static gboolean
index_seek (GstPad * pad, GstEvent * event)
{
GstIndexEntry *entry;
GstMpeg2dec *mpeg2dec;
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
mpeg2dec = GST_MPEG2DEC (GST_PAD_PARENT (pad));
gst_event_parse_seek (event, &rate, &format, &flags,
&cur_type, &cur, &stop_type, &stop);
entry = gst_index_get_assoc_entry (mpeg2dec->index, mpeg2dec->index_id,
GST_INDEX_LOOKUP_BEFORE, GST_ASSOCIATION_FLAG_KEY_UNIT, format, cur);
if ((entry) && gst_pad_is_linked (mpeg2dec->sinkpad)) {
const GstFormat *peer_formats, *try_formats;
/* since we know the exact byteoffset of the frame, make sure to seek on bytes first */
const GstFormat try_all_formats[] = {
GST_FORMAT_BYTES,
GST_FORMAT_TIME,
0
};
try_formats = try_all_formats;
#if 0
peer_formats = gst_pad_get_formats (GST_PAD_PEER (mpeg2dec->sinkpad));
#else
peer_formats = try_all_formats; /* FIXE ME */
#endif
while (gst_formats_contains (peer_formats, *try_formats)) {
gint64 value;
if (gst_index_entry_assoc_map (entry, *try_formats, &value)) {
GstEvent *seek_event;
GST_DEBUG_OBJECT (mpeg2dec, "index %s %" G_GINT64_FORMAT
" -> %s %" G_GINT64_FORMAT,
gst_format_get_details (format)->nick,
cur, gst_format_get_details (*try_formats)->nick, value);
/* lookup succeeded, create the seek */
seek_event =
gst_event_new_seek (rate, *try_formats, flags, cur_type, value,
stop_type, stop);
/* do the seek */
if (gst_pad_push_event (mpeg2dec->sinkpad, seek_event)) {
/* seek worked, we're done, loop will exit */
#if 0
mpeg2dec->segment_start = GST_EVENT_SEEK_OFFSET (event);
#endif
return TRUE;
}
}
try_formats++;
}
}
return FALSE;
}
#endif
static gboolean
normal_seek (GstPad * pad, GstEvent * event)
{
gdouble rate;
GstFormat format, conv;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
gint64 time_cur, bytes_cur;
gint64 time_stop, bytes_stop;
gboolean res;
GstMpeg2dec *mpeg2dec;
GstEvent *peer_event;
mpeg2dec = GST_MPEG2DEC (GST_PAD_PARENT (pad));
GST_DEBUG ("normal seek");
gst_event_parse_seek (event, &rate, &format, &flags,
&cur_type, &cur, &stop_type, &stop);
conv = GST_FORMAT_TIME;
if (!gst_mpeg2dec_src_convert (pad, format, cur, &conv, &time_cur))
goto convert_failed;
if (!gst_mpeg2dec_src_convert (pad, format, stop, &conv, &time_stop))
goto convert_failed;
GST_DEBUG ("seek to time %" GST_TIME_FORMAT "-%" GST_TIME_FORMAT,
GST_TIME_ARGS (time_cur), GST_TIME_ARGS (time_stop));
peer_event = gst_event_new_seek (rate, GST_FORMAT_TIME, flags,
cur_type, time_cur, stop_type, time_stop);
/* try seek on time then */
if ((res = gst_pad_push_event (mpeg2dec->sinkpad, peer_event)))
goto done;
/* else we try to seek on bytes */
conv = GST_FORMAT_BYTES;
if (!gst_mpeg2dec_sink_convert (pad, GST_FORMAT_TIME, time_cur,
&conv, &bytes_cur))
goto convert_failed;
if (!gst_mpeg2dec_sink_convert (pad, GST_FORMAT_TIME, time_stop,
&conv, &bytes_stop))
goto convert_failed;
/* conversion succeeded, create the seek */
peer_event =
gst_event_new_seek (rate, GST_FORMAT_BYTES, flags,
cur_type, bytes_cur, stop_type, bytes_stop);
/* do the seek */
res = gst_pad_push_event (mpeg2dec->sinkpad, peer_event);
done:
return res;
/* ERRORS */
convert_failed:
{
/* probably unsupported seek format */
GST_DEBUG_OBJECT (mpeg2dec,
"failed to convert format %u into GST_FORMAT_TIME", format);
return FALSE;
}
}
static gboolean
gst_mpeg2dec_src_event (GstPad * pad, GstEvent * event)
{
gboolean res;
GstMpeg2dec *mpeg2dec;
mpeg2dec = GST_MPEG2DEC (GST_PAD_PARENT (pad));
if (mpeg2dec->decoder == NULL)
goto no_decoder;
switch (GST_EVENT_TYPE (event)) {
/* the all-formats seek logic */
case GST_EVENT_SEEK:{
gst_event_ref (event);
if (!(res = gst_pad_push_event (mpeg2dec->sinkpad, event))) {
#ifndef GST_DISABLE_INDEX
if (mpeg2dec->index)
res = index_seek (pad, event);
else
#endif
res = normal_seek (pad, event);
}
gst_event_unref (event);
break;
}
case GST_EVENT_QOS:
{
gdouble proportion;
GstClockTimeDiff diff;
GstClockTime timestamp;
gst_event_parse_qos (event, &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_NAVIGATION:
/* Forward a navigation event 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);
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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