mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-18 07:47:17 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/subprojects/gst-plugins-ugly/ext/mpeg2dec/gstmpeg2dec.c

1180 lines
37 KiB
C
Raw Blame History

/* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include <inttypes.h>
#include "gstmpeg2dec.h"
#include <gst/video/gstvideometa.h>
#include <gst/video/gstvideopool.h>
/* 16byte-aligns a buffer for libmpeg2 */
#define ALIGN_16(p) ((void *)(((uintptr_t)(p) + 15) & ~((uintptr_t)15)))
GST_DEBUG_CATEGORY_STATIC (mpeg2dec_debug);
#define GST_CAT_DEFAULT mpeg2dec_debug
GST_DEBUG_CATEGORY_STATIC (CAT_PERFORMANCE);
/* 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)
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) { YV12, I420, Y42B, Y444 }, "
"width = (int) [ 16, 4096 ], "
"height = (int) [ 16, 4096 ], "
"framerate = (fraction) [ 0/1, 2147483647/1 ]")
);
#define gst_mpeg2dec_parent_class parent_class
G_DEFINE_TYPE (GstMpeg2dec, gst_mpeg2dec, GST_TYPE_VIDEO_DECODER);
GST_ELEMENT_REGISTER_DEFINE (mpeg2dec, "mpeg2dec", GST_RANK_SECONDARY,
GST_TYPE_MPEG2DEC);
static void gst_mpeg2dec_finalize (GObject * object);
/* GstVideoDecoder base class method */
static gboolean gst_mpeg2dec_open (GstVideoDecoder * decoder);
static gboolean gst_mpeg2dec_close (GstVideoDecoder * decoder);
static gboolean gst_mpeg2dec_start (GstVideoDecoder * decoder);
static gboolean gst_mpeg2dec_stop (GstVideoDecoder * decoder);
static gboolean gst_mpeg2dec_set_format (GstVideoDecoder * decoder,
GstVideoCodecState * state);
static gboolean gst_mpeg2dec_flush (GstVideoDecoder * decoder);
static GstFlowReturn gst_mpeg2dec_finish (GstVideoDecoder * decoder);
static GstFlowReturn gst_mpeg2dec_handle_frame (GstVideoDecoder * decoder,
GstVideoCodecFrame * frame);
static gboolean gst_mpeg2dec_decide_allocation (GstVideoDecoder * decoder,
GstQuery * query);
static void gst_mpeg2dec_clear_buffers (GstMpeg2dec * mpeg2dec);
static gboolean gst_mpeg2dec_crop_buffer (GstMpeg2dec * dec,
GstVideoCodecFrame * in_frame, GstVideoFrame * in_vframe);
static void
gst_mpeg2dec_class_init (GstMpeg2decClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GstVideoDecoderClass *video_decoder_class = GST_VIDEO_DECODER_CLASS (klass);
gobject_class->finalize = gst_mpeg2dec_finalize;
gst_element_class_add_static_pad_template (element_class,
&src_template_factory);
gst_element_class_add_static_pad_template (element_class,
&sink_template_factory);
gst_element_class_set_static_metadata (element_class,
"mpeg1 and mpeg2 video decoder", "Codec/Decoder/Video",
"Uses libmpeg2 to decode MPEG video streams",
"Wim Taymans <wim.taymans@chello.be>");
video_decoder_class->open = GST_DEBUG_FUNCPTR (gst_mpeg2dec_open);
video_decoder_class->close = GST_DEBUG_FUNCPTR (gst_mpeg2dec_close);
video_decoder_class->start = GST_DEBUG_FUNCPTR (gst_mpeg2dec_start);
video_decoder_class->stop = GST_DEBUG_FUNCPTR (gst_mpeg2dec_stop);
video_decoder_class->flush = GST_DEBUG_FUNCPTR (gst_mpeg2dec_flush);
video_decoder_class->set_format = GST_DEBUG_FUNCPTR (gst_mpeg2dec_set_format);
video_decoder_class->handle_frame =
GST_DEBUG_FUNCPTR (gst_mpeg2dec_handle_frame);
video_decoder_class->finish = GST_DEBUG_FUNCPTR (gst_mpeg2dec_finish);
video_decoder_class->decide_allocation =
GST_DEBUG_FUNCPTR (gst_mpeg2dec_decide_allocation);
GST_DEBUG_CATEGORY_INIT (mpeg2dec_debug, "mpeg2dec", 0,
"MPEG-2 Video Decoder");
GST_DEBUG_CATEGORY_GET (CAT_PERFORMANCE, "GST_PERFORMANCE");
}
static void
gst_mpeg2dec_init (GstMpeg2dec * mpeg2dec)
{
gst_video_decoder_set_packetized (GST_VIDEO_DECODER (mpeg2dec), TRUE);
gst_video_decoder_set_needs_format (GST_VIDEO_DECODER (mpeg2dec), TRUE);
gst_video_decoder_set_use_default_pad_acceptcaps (GST_VIDEO_DECODER_CAST
(mpeg2dec), TRUE);
GST_PAD_SET_ACCEPT_TEMPLATE (GST_VIDEO_DECODER_SINK_PAD (mpeg2dec));
/* 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;
}
gst_mpeg2dec_clear_buffers (mpeg2dec);
g_free (mpeg2dec->dummybuf[3]);
mpeg2dec->dummybuf[3] = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static gboolean
gst_mpeg2dec_open (GstVideoDecoder * decoder)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (decoder);
mpeg2_accel (MPEG2_ACCEL_DETECT);
if ((mpeg2dec->decoder = mpeg2_init ()) == NULL)
return FALSE;
mpeg2dec->info = mpeg2_info (mpeg2dec->decoder);
return TRUE;
}
static gboolean
gst_mpeg2dec_close (GstVideoDecoder * decoder)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (decoder);
if (mpeg2dec->decoder) {
mpeg2_close (mpeg2dec->decoder);
mpeg2dec->decoder = NULL;
mpeg2dec->info = NULL;
}
gst_mpeg2dec_clear_buffers (mpeg2dec);
return TRUE;
}
static gboolean
gst_mpeg2dec_set_format (GstVideoDecoder * decoder, GstVideoCodecState * state)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (decoder);
/* Save input state to be used as reference for output state */
if (mpeg2dec->input_state)
gst_video_codec_state_unref (mpeg2dec->input_state);
mpeg2dec->input_state = gst_video_codec_state_ref (state);
return TRUE;
}
static gboolean
gst_mpeg2dec_start (GstVideoDecoder * decoder)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (decoder);
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
return TRUE;
}
static gboolean
gst_mpeg2dec_stop (GstVideoDecoder * decoder)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (decoder);
mpeg2_reset (mpeg2dec->decoder, 0);
mpeg2_skip (mpeg2dec->decoder, 1);
gst_mpeg2dec_clear_buffers (mpeg2dec);
if (mpeg2dec->input_state)
gst_video_codec_state_unref (mpeg2dec->input_state);
mpeg2dec->input_state = NULL;
if (mpeg2dec->downstream_pool) {
gst_buffer_pool_set_active (mpeg2dec->downstream_pool, FALSE);
gst_object_unref (mpeg2dec->downstream_pool);
}
return TRUE;
}
static gboolean
gst_mpeg2dec_flush (GstVideoDecoder * decoder)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (decoder);
/* reset the initial video state */
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
mpeg2_reset (mpeg2dec->decoder, 1);
mpeg2_skip (mpeg2dec->decoder, 1);
gst_mpeg2dec_clear_buffers (mpeg2dec);
if (mpeg2dec->downstream_pool)
gst_buffer_pool_set_active (mpeg2dec->downstream_pool, FALSE);
return TRUE;
}
static GstFlowReturn
gst_mpeg2dec_finish (GstVideoDecoder * decoder)
{
return GST_FLOW_OK;
}
static GstBufferPool *
gst_mpeg2dec_create_generic_pool (GstAllocator * allocator,
GstAllocationParams * params, GstCaps * caps, guint size, guint min,
guint max, GstStructure ** out_config)
{
GstBufferPool *pool;
GstStructure *config;
pool = gst_video_buffer_pool_new ();
config = gst_buffer_pool_get_config (pool);
gst_buffer_pool_config_set_allocator (config, allocator, params);
gst_buffer_pool_config_set_params (config, caps, size, min, max);
gst_buffer_pool_config_add_option (config, GST_BUFFER_POOL_OPTION_VIDEO_META);
*out_config = config;
return pool;
}
static gboolean
gst_mpeg2dec_decide_allocation (GstVideoDecoder * decoder, GstQuery * query)
{
GstMpeg2dec *dec = GST_MPEG2DEC (decoder);
GstBufferPool *pool;
guint size, min, max;
GstStructure *config, *down_config = NULL;
GstAllocator *allocator;
GstAllocationParams params;
gboolean update_allocator;
gboolean has_videometa = FALSE;
GstCaps *caps;
/* Get rid of ancient pool */
if (dec->downstream_pool) {
gst_buffer_pool_set_active (dec->downstream_pool, FALSE);
gst_object_unref (dec->downstream_pool);
dec->downstream_pool = NULL;
}
/* Get negotiated allocation caps */
gst_query_parse_allocation (query, &caps, NULL);
/* Set allocation parameters to guarantee 16-byte aligned output buffers */
if (gst_query_get_n_allocation_params (query) > 0) {
gst_query_parse_nth_allocation_param (query, 0, &allocator, &params);
update_allocator = TRUE;
} else {
allocator = NULL;
gst_allocation_params_init (&params);
update_allocator = FALSE;
}
params.align = MAX (params.align, 15);
if (update_allocator)
gst_query_set_nth_allocation_param (query, 0, allocator, &params);
else
gst_query_add_allocation_param (query, allocator, &params);
/* Now chain up to the parent class to guarantee that we can
* get a buffer pool from the query */
if (!GST_VIDEO_DECODER_CLASS (parent_class)->decide_allocation (decoder,
query)) {
if (allocator)
gst_object_unref (allocator);
return FALSE;
}
gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
config = gst_buffer_pool_get_config (pool);
if (gst_query_find_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL)) {
gst_buffer_pool_config_add_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_META);
has_videometa = TRUE;
}
if (dec->need_alignment) {
/* If downstream does not support video meta, we will have to copy, keep
* the downstream pool to avoid double copying */
if (!has_videometa) {
dec->downstream_pool = pool;
pool = NULL;
down_config = config;
config = NULL;
min = 2;
max = 0;
}
/* In case downstream support video meta, but the downstream pool does not
* have alignment support, discard downstream pool and use video pool */
else if (!gst_buffer_pool_has_option (pool,
GST_BUFFER_POOL_OPTION_VIDEO_ALIGNMENT)) {
gst_object_unref (pool);
pool = NULL;
gst_structure_free (config);
config = NULL;
}
if (!pool)
pool = gst_mpeg2dec_create_generic_pool (allocator, &params, caps, size,
min, max, &config);
gst_buffer_pool_config_add_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_ALIGNMENT);
gst_buffer_pool_config_set_video_alignment (config, &dec->valign);
}
if (allocator)
gst_object_unref (allocator);
/* If we are copying out, we'll need to setup and activate the other pool */
if (dec->downstream_pool) {
if (!gst_buffer_pool_set_config (dec->downstream_pool, down_config)) {
down_config = gst_buffer_pool_get_config (dec->downstream_pool);
if (!gst_buffer_pool_config_validate_params (down_config, caps, size, min,
max)) {
gst_structure_free (down_config);
goto config_failed;
}
if (!gst_buffer_pool_set_config (dec->downstream_pool, down_config))
goto config_failed;
}
if (!gst_buffer_pool_set_active (dec->downstream_pool, TRUE))
goto activate_failed;
}
/* Now configure the pool, if the pool had made some changes, it will
* return FALSE. Validate the changes ...*/
if (!gst_buffer_pool_set_config (pool, config)) {
config = gst_buffer_pool_get_config (pool);
/* Check basic params */
if (!gst_buffer_pool_config_validate_params (config, caps, size, min, max)) {
gst_structure_free (config);
goto config_failed;
}
/* If needed, check that resulting alignment is still valid */
if (dec->need_alignment) {
GstVideoAlignment valign;
if (!gst_buffer_pool_config_get_video_alignment (config, &valign)) {
gst_structure_free (config);
goto config_failed;
}
if (valign.padding_left != 0 || valign.padding_top != 0
|| valign.padding_right < dec->valign.padding_right
|| valign.padding_bottom < dec->valign.padding_bottom) {
gst_structure_free (config);
goto config_failed;
}
}
if (!gst_buffer_pool_set_config (pool, config))
goto config_failed;
}
/* For external pools, we need to check strides */
if (!GST_IS_VIDEO_BUFFER_POOL (pool) && has_videometa) {
GstBuffer *buffer;
const GstVideoFormatInfo *finfo;
GstVideoMeta *vmeta;
gint uv_stride;
if (!gst_buffer_pool_set_active (pool, TRUE))
goto activate_failed;
if (gst_buffer_pool_acquire_buffer (pool, &buffer, NULL) != GST_FLOW_OK) {
gst_buffer_pool_set_active (pool, FALSE);
goto acquire_failed;
}
vmeta = gst_buffer_get_video_meta (buffer);
finfo = gst_video_format_get_info (vmeta->format);
/* Check that strides are compatible. In this case, we can scale the
* stride directly since all the pixel strides for the formats we support
* is 1 */
uv_stride = GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (finfo, 1, vmeta->stride[0]);
if (uv_stride != vmeta->stride[1] || uv_stride != vmeta->stride[2]) {
gst_buffer_pool_set_active (pool, FALSE);
gst_object_unref (pool);
pool = gst_mpeg2dec_create_generic_pool (allocator, &params, caps, size,
min, max, &config);
if (dec->need_alignment) {
gst_buffer_pool_config_add_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_ALIGNMENT);
gst_buffer_pool_config_set_video_alignment (config, &dec->valign);
}
/* Generic pool don't fail on _set_config() */
gst_buffer_pool_set_config (pool, config);
}
gst_buffer_unref (buffer);
}
gst_query_set_nth_allocation_pool (query, 0, pool, size, min, max);
gst_object_unref (pool);
return TRUE;
config_failed:
gst_object_unref (pool);
GST_ELEMENT_ERROR (dec, RESOURCE, SETTINGS,
("Failed to configure buffer pool"),
("Configuration is most likely invalid, please report this issue."));
return FALSE;
activate_failed:
gst_object_unref (pool);
GST_ELEMENT_ERROR (dec, RESOURCE, SETTINGS,
("Failed to activate buffer pool"), (NULL));
return FALSE;
acquire_failed:
gst_object_unref (pool);
GST_ELEMENT_ERROR (dec, RESOURCE, SETTINGS,
("Failed to acquire a buffer"), (NULL));
return FALSE;
}
static GstFlowReturn
gst_mpeg2dec_crop_buffer (GstMpeg2dec * dec, GstVideoCodecFrame * in_frame,
GstVideoFrame * input_vframe)
{
GstVideoCodecState *state;
GstVideoInfo *info;
GstVideoInfo *dinfo;
GstVideoFrame output_frame;
GstFlowReturn ret;
GstBuffer *buffer = NULL;
state = gst_video_decoder_get_output_state (GST_VIDEO_DECODER (dec));
info = &state->info;
dinfo = &dec->decoded_info;
GST_CAT_LOG_OBJECT (CAT_PERFORMANCE, dec,
"Copying input buffer %ux%u (%" G_GSIZE_FORMAT ") to output buffer "
"%ux%u (%" G_GSIZE_FORMAT ")", dinfo->width, dinfo->height,
dinfo->size, info->width, info->height, info->size);
ret = gst_buffer_pool_acquire_buffer (dec->downstream_pool, &buffer, NULL);
if (ret != GST_FLOW_OK)
goto beach;
if (!gst_video_frame_map (&output_frame, info, buffer, GST_MAP_WRITE))
goto map_fail;
if (in_frame->output_buffer)
gst_buffer_unref (in_frame->output_buffer);
in_frame->output_buffer = buffer;
if (!gst_video_frame_copy (&output_frame, input_vframe))
goto copy_failed;
gst_video_frame_unmap (&output_frame);
GST_BUFFER_FLAGS (in_frame->output_buffer) =
GST_BUFFER_FLAGS (input_vframe->buffer);
beach:
gst_video_codec_state_unref (state);
return ret;
map_fail:
{
GST_ERROR_OBJECT (dec, "Failed to map output frame");
gst_video_codec_state_unref (state);
return GST_FLOW_ERROR;
}
copy_failed:
{
GST_ERROR_OBJECT (dec, "Failed to copy output frame");
gst_video_frame_unmap (&output_frame);
gst_video_codec_state_unref (state);
return GST_FLOW_ERROR;
}
}
typedef struct
{
gint id;
GstVideoFrame frame;
} GstMpeg2DecBuffer;
static void
gst_mpeg2dec_clear_buffers (GstMpeg2dec * mpeg2dec)
{
GList *l;
while ((l = g_list_first (mpeg2dec->buffers))) {
GstMpeg2DecBuffer *mbuf = l->data;
gst_video_frame_unmap (&mbuf->frame);
g_slice_free (GstMpeg2DecBuffer, mbuf);
mpeg2dec->buffers = g_list_delete_link (mpeg2dec->buffers, l);
}
}
static void
gst_mpeg2dec_save_buffer (GstMpeg2dec * mpeg2dec, gint id,
GstVideoFrame * frame)
{
GstMpeg2DecBuffer *mbuf;
GST_LOG_OBJECT (mpeg2dec, "Saving local info for frame %d", id);
mbuf = g_slice_new0 (GstMpeg2DecBuffer);
mbuf->id = id;
mbuf->frame = *frame;
mpeg2dec->buffers = g_list_prepend (mpeg2dec->buffers, mbuf);
}
static gint
gst_mpeg2dec_buffer_compare (GstMpeg2DecBuffer * mbuf, gconstpointer id)
{
if (mbuf->id == GPOINTER_TO_INT (id))
return 0;
return -1;
}
static void
gst_mpeg2dec_discard_buffer (GstMpeg2dec * mpeg2dec, gint id)
{
GList *l = g_list_find_custom (mpeg2dec->buffers, GINT_TO_POINTER (id),
(GCompareFunc) gst_mpeg2dec_buffer_compare);
if (l) {
GstMpeg2DecBuffer *mbuf = l->data;
gst_video_frame_unmap (&mbuf->frame);
g_slice_free (GstMpeg2DecBuffer, mbuf);
mpeg2dec->buffers = g_list_delete_link (mpeg2dec->buffers, l);
GST_LOG_OBJECT (mpeg2dec, "Discarded local info for frame %d", id);
} else {
GST_WARNING ("Could not find buffer %d, will be leaked until next reset",
id);
}
}
static GstVideoFrame *
gst_mpeg2dec_get_buffer (GstMpeg2dec * mpeg2dec, gint id)
{
GList *l = g_list_find_custom (mpeg2dec->buffers, GINT_TO_POINTER (id),
(GCompareFunc) gst_mpeg2dec_buffer_compare);
if (l) {
GstMpeg2DecBuffer *mbuf = l->data;
return &mbuf->frame;
}
return NULL;
}
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->decoded_info.size + 15);
mpeg2dec->dummybuf[0] = ALIGN_16 (mpeg2dec->dummybuf[3]);
mpeg2dec->dummybuf[1] =
mpeg2dec->dummybuf[0] +
GST_VIDEO_INFO_PLANE_OFFSET (&mpeg2dec->decoded_info, 1);
mpeg2dec->dummybuf[2] =
mpeg2dec->dummybuf[0] +
GST_VIDEO_INFO_PLANE_OFFSET (&mpeg2dec->decoded_info, 2);
}
static GstFlowReturn
handle_sequence (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
{
GstFlowReturn ret = GST_FLOW_OK;
GstClockTime latency;
const mpeg2_sequence_t *sequence;
GstVideoCodecState *state;
GstVideoInfo *vinfo;
GstVideoFormat format;
sequence = info->sequence;
if (sequence->frame_period == 0)
goto invalid_frame_period;
/* mpeg2 video can only be from 16x16 to 4096x4096. Everything
* else is a corrupted file */
if (sequence->width > 4096 || sequence->width < 16 ||
sequence->height > 4096 || sequence->height < 16)
goto invalid_size;
GST_DEBUG_OBJECT (mpeg2dec,
"widthxheight: %dx%d , decoded_widthxheight: %dx%d",
sequence->picture_width, sequence->picture_height, sequence->width,
sequence->height);
gst_video_alignment_reset (&mpeg2dec->valign);
if (sequence->picture_width < sequence->width ||
sequence->picture_height < sequence->height) {
GST_DEBUG_OBJECT (mpeg2dec, "we need to crop");
mpeg2dec->valign.padding_right = sequence->width - sequence->picture_width;
mpeg2dec->valign.padding_bottom =
sequence->height - sequence->picture_height;
mpeg2dec->need_alignment = TRUE;
} else if (sequence->picture_width == sequence->width ||
sequence->picture_height == sequence->height) {
GST_DEBUG_OBJECT (mpeg2dec, "no cropping needed");
mpeg2dec->need_alignment = FALSE;
} else {
goto invalid_picture;
}
/* get subsampling */
if (sequence->chroma_width < sequence->width) {
/* horizontally subsampled */
if (sequence->chroma_height < sequence->height) {
/* and vertically subsamples */
format = GST_VIDEO_FORMAT_I420;
} else {
format = GST_VIDEO_FORMAT_Y42B;
}
} else {
/* not subsampled */
format = GST_VIDEO_FORMAT_Y444;
}
state = gst_video_decoder_set_output_state (GST_VIDEO_DECODER (mpeg2dec),
format, sequence->picture_width, sequence->picture_height,
mpeg2dec->input_state);
vinfo = &state->info;
/* If we don't have a valid upstream PAR override it */
if (GST_VIDEO_INFO_PAR_N (vinfo) == 1 &&
GST_VIDEO_INFO_PAR_D (vinfo) == 1 &&
sequence->pixel_width != 0 && sequence->pixel_height != 0) {
guint pixel_width, pixel_height;
if (mpeg2_guess_aspect (sequence, &pixel_width, &pixel_height)) {
vinfo->par_n = pixel_width;
vinfo->par_d = pixel_height;
}
GST_DEBUG_OBJECT (mpeg2dec, "Setting PAR %d x %d",
vinfo->par_n, vinfo->par_d);
}
vinfo->fps_n = 27000000;
vinfo->fps_d = sequence->frame_period;
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 reserved */
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 reserved */
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 reserved */
default:
vinfo->colorimetry.transfer = GST_VIDEO_TRANSFER_UNKNOWN;
break;
}
}
GST_DEBUG_OBJECT (mpeg2dec,
"sequence flags: %d, frame period: %d, frame rate: %d/%d",
sequence->flags, sequence->frame_period, 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);
/* Save the padded video information */
mpeg2dec->decoded_info = *vinfo;
gst_video_info_align (&mpeg2dec->decoded_info, &mpeg2dec->valign);
/* Mpeg2dec has 2 frame latency to produce a picture and 1 frame latency in
* it's parser */
latency = gst_util_uint64_scale (3 * GST_SECOND, vinfo->fps_d, vinfo->fps_n);
gst_video_decoder_set_latency (GST_VIDEO_DECODER (mpeg2dec), latency,
latency);
if (!gst_video_decoder_negotiate (GST_VIDEO_DECODER (mpeg2dec)))
goto negotiation_fail;
gst_video_codec_state_unref (state);
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);
gst_mpeg2dec_clear_buffers (mpeg2dec);
return ret;
invalid_frame_period:
{
GST_WARNING_OBJECT (mpeg2dec, "Frame period is 0!");
return GST_FLOW_ERROR;
}
invalid_size:
{
GST_ERROR_OBJECT (mpeg2dec, "Invalid frame dimensions: %d x %d",
sequence->width, sequence->height);
return GST_FLOW_ERROR;
}
invalid_picture:
{
GST_ERROR_OBJECT (mpeg2dec, "Picture dimension bigger then frame: "
"%d x %d is bigger then %d x %d", sequence->picture_width,
sequence->picture_height, sequence->width, sequence->height);
return GST_FLOW_ERROR;
}
negotiation_fail:
{
GST_WARNING_OBJECT (mpeg2dec, "Failed to negotiate with downstream");
gst_video_codec_state_unref (state);
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
handle_picture (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info,
GstVideoCodecFrame * frame)
{
GstVideoDecoder *decoder = (GstVideoDecoder *) mpeg2dec;
GstFlowReturn ret;
gint type;
const gchar *type_str = NULL;
gboolean key_frame = FALSE;
const mpeg2_picture_t *picture = info->current_picture;
GstVideoFrame vframe;
guint8 *buf[3];
ret = gst_video_decoder_allocate_output_frame (decoder, frame);
if (ret != GST_FLOW_OK)
return ret;
type = picture->flags & PIC_MASK_CODING_TYPE;
switch (type) {
case PIC_FLAG_CODING_TYPE_I:
key_frame = TRUE;
mpeg2_skip (mpeg2dec->decoder, 0);
type_str = "I";
break;
case PIC_FLAG_CODING_TYPE_P:
type_str = "P";
break;
case PIC_FLAG_CODING_TYPE_B:
type_str = "B";
break;
default:
gst_video_codec_frame_ref (frame);
ret = gst_video_decoder_drop_frame (GST_VIDEO_DECODER (mpeg2dec), frame);
GST_VIDEO_DECODER_ERROR (mpeg2dec, 1, STREAM, DECODE,
("decoding error"), ("Invalid picture type"), ret);
return ret;
}
GST_DEBUG_OBJECT (mpeg2dec, "handle picture type %s", type_str);
GST_DEBUG_OBJECT (mpeg2dec, "picture %s, frame %i",
key_frame ? ", kf," : " ", frame->system_frame_number);
if (GST_VIDEO_INFO_IS_INTERLACED (&mpeg2dec->decoded_info)) {
/* This implies SEQ_FLAG_PROGRESSIVE_SEQUENCE is not set */
if (picture->flags & PIC_FLAG_TOP_FIELD_FIRST) {
GST_BUFFER_FLAG_SET (frame->output_buffer, GST_VIDEO_BUFFER_FLAG_TFF);
}
if (!(picture->flags & PIC_FLAG_PROGRESSIVE_FRAME)) {
GST_BUFFER_FLAG_SET (frame->output_buffer,
GST_VIDEO_BUFFER_FLAG_INTERLACED);
}
if (picture->flags & PIC_FLAG_REPEAT_FIRST_FIELD) {
GST_BUFFER_FLAG_SET (frame->output_buffer, GST_VIDEO_BUFFER_FLAG_RFF);
}
}
if (mpeg2dec->discont_state == MPEG2DEC_DISC_NEW_PICTURE && key_frame) {
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_KEYFRAME;
}
GST_DEBUG_OBJECT (mpeg2dec,
"picture: %s %s %s %s %s fields:%d ts:%"
GST_TIME_FORMAT,
(picture->flags & PIC_FLAG_PROGRESSIVE_FRAME ? "prog" : " "),
(picture->flags & PIC_FLAG_TOP_FIELD_FIRST ? "tff" : " "),
(picture->flags & PIC_FLAG_REPEAT_FIRST_FIELD ? "rff" : " "),
(picture->flags & PIC_FLAG_SKIP ? "skip" : " "),
(picture->flags & PIC_FLAG_COMPOSITE_DISPLAY ? "composite" : " "),
picture->nb_fields, GST_TIME_ARGS (frame->pts));
if (!gst_video_frame_map (&vframe, &mpeg2dec->decoded_info,
frame->output_buffer, GST_MAP_READ | GST_MAP_WRITE))
goto map_fail;
buf[0] = GST_VIDEO_FRAME_PLANE_DATA (&vframe, 0);
buf[1] = GST_VIDEO_FRAME_PLANE_DATA (&vframe, 1);
buf[2] = GST_VIDEO_FRAME_PLANE_DATA (&vframe, 2);
GST_DEBUG_OBJECT (mpeg2dec, "set_buf: %p %p %p, frame %i",
buf[0], buf[1], buf[2], frame->system_frame_number);
/* Note: We use a non-null 'id' value to make the distinction
* between the dummy buffers (which have an id of NULL) and the
* ones we did */
mpeg2_stride (mpeg2dec->decoder, vframe.info.stride[0]);
mpeg2_set_buf (mpeg2dec->decoder, buf,
GINT_TO_POINTER (frame->system_frame_number + 1));
gst_mpeg2dec_save_buffer (mpeg2dec, frame->system_frame_number, &vframe);
return ret;
map_fail:
{
GST_ELEMENT_ERROR (mpeg2dec, RESOURCE, WRITE, ("Failed to map frame"),
(NULL));
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
handle_slice (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info)
{
GstFlowReturn ret = GST_FLOW_OK;
GstVideoCodecFrame *frame;
const mpeg2_picture_t *picture;
gboolean key_frame = FALSE;
gboolean bidirect_frame = FALSE;
gboolean closed_gop = FALSE;
GST_DEBUG_OBJECT (mpeg2dec,
"fbuf:%p display_picture:%p current_picture:%p fbuf->id:%d",
info->display_fbuf, info->display_picture, info->current_picture,
GPOINTER_TO_INT (info->display_fbuf->id) - 1);
/* Note, the fbuf-id is shifted by 1 to make the difference between
* NULL values (used by dummy buffers) and 'real' values */
frame = gst_video_decoder_get_frame (GST_VIDEO_DECODER (mpeg2dec),
GPOINTER_TO_INT (info->display_fbuf->id) - 1);
if (!frame)
goto no_frame;
picture = info->display_picture;
key_frame = (picture->flags & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_I;
bidirect_frame =
(picture->flags & PIC_MASK_CODING_TYPE) == PIC_FLAG_CODING_TYPE_B;
closed_gop = (info->gop->flags & GOP_FLAG_CLOSED_GOP);
GST_DEBUG_OBJECT (mpeg2dec, "picture flags: %d, type: %d, keyframe: %d",
picture->flags, picture->flags & PIC_MASK_CODING_TYPE, key_frame);
if (key_frame) {
mpeg2_skip (mpeg2dec->decoder, 0);
}
if (mpeg2dec->discont_state == MPEG2DEC_DISC_NEW_KEYFRAME && key_frame)
mpeg2dec->discont_state = MPEG2DEC_DISC_NONE;
if (picture->flags & PIC_FLAG_SKIP) {
GST_DEBUG_OBJECT (mpeg2dec, "dropping buffer because of skip flag");
ret = gst_video_decoder_drop_frame (GST_VIDEO_DECODER (mpeg2dec), frame);
mpeg2_skip (mpeg2dec->decoder, 1);
return ret;
}
/* Skip B-frames if GOP is not closed and waiting for the first keyframe. */
if (mpeg2dec->discont_state != MPEG2DEC_DISC_NONE) {
if (bidirect_frame && !closed_gop) {
GST_DEBUG_OBJECT (mpeg2dec, "dropping buffer, discont state %d",
mpeg2dec->discont_state);
ret = gst_video_decoder_drop_frame (GST_VIDEO_DECODER (mpeg2dec), frame);
return ret;
}
}
/* do cropping if the target region is smaller than the input one */
if (mpeg2dec->downstream_pool) {
GstVideoFrame *vframe;
if (gst_video_decoder_get_max_decode_time (GST_VIDEO_DECODER (mpeg2dec),
frame) < 0) {
GST_DEBUG_OBJECT (mpeg2dec, "dropping buffer crop, too late");
return gst_video_decoder_drop_frame (GST_VIDEO_DECODER (mpeg2dec), frame);
}
GST_DEBUG_OBJECT (mpeg2dec, "Doing a crop copy of the decoded buffer");
vframe = gst_mpeg2dec_get_buffer (mpeg2dec, frame->system_frame_number);
g_assert (vframe != NULL);
ret = gst_mpeg2dec_crop_buffer (mpeg2dec, frame, vframe);
if (ret != GST_FLOW_OK) {
gst_video_decoder_drop_frame (GST_VIDEO_DECODER (mpeg2dec), frame);
return ret;
}
}
ret = gst_video_decoder_finish_frame (GST_VIDEO_DECODER (mpeg2dec), frame);
return ret;
no_frame:
{
GST_DEBUG ("display buffer does not have a valid frame");
return GST_FLOW_OK;
}
}
static GstFlowReturn
gst_mpeg2dec_handle_frame (GstVideoDecoder * decoder,
GstVideoCodecFrame * frame)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (decoder);
GstBuffer *buf = frame->input_buffer;
GstMapInfo minfo;
const mpeg2_info_t *info;
mpeg2_state_t state;
gboolean done = FALSE;
GstFlowReturn ret = GST_FLOW_OK;
GST_LOG_OBJECT (mpeg2dec, "received frame %d, timestamp %"
GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
frame->system_frame_number,
GST_TIME_ARGS (frame->pts), GST_TIME_ARGS (frame->duration));
gst_buffer_ref (buf);
if (!gst_buffer_map (buf, &minfo, GST_MAP_READ)) {
GST_ERROR_OBJECT (mpeg2dec, "Failed to map input buffer");
gst_buffer_unref (buf);
return GST_FLOW_ERROR;
}
info = mpeg2dec->info;
GST_LOG_OBJECT (mpeg2dec, "calling mpeg2_buffer");
mpeg2_buffer (mpeg2dec->decoder, minfo.data, minfo.data + minfo.size);
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) {
case STATE_SEQUENCE_MODIFIED:
GST_DEBUG_OBJECT (mpeg2dec, "sequence modified");
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
gst_mpeg2dec_clear_buffers (mpeg2dec);
/* fall through */
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) {
GST_VIDEO_DECODER_ERROR (decoder, 1, STREAM, DECODE,
("decoding error"), ("Bad sequence header"), ret);
gst_video_decoder_drop_frame (decoder, frame);
gst_mpeg2dec_flush (decoder);
goto done;
}
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, frame);
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;
case STATE_INVALID_END:
GST_DEBUG_OBJECT (mpeg2dec, "invalid end");
case STATE_END:
GST_DEBUG_OBJECT (mpeg2dec, "end");
case STATE_SLICE:
GST_DEBUG_OBJECT (mpeg2dec, "display_fbuf:%p, discard_fbuf:%p",
info->display_fbuf, info->discard_fbuf);
if (info->display_fbuf && info->display_fbuf->id) {
ret = handle_slice (mpeg2dec, info);
} else {
GST_DEBUG_OBJECT (mpeg2dec, "no picture to display");
}
if (info->discard_fbuf && info->discard_fbuf->id)
gst_mpeg2dec_discard_buffer (mpeg2dec,
GPOINTER_TO_INT (info->discard_fbuf->id) - 1);
if (state != STATE_SLICE) {
gst_mpeg2dec_clear_buffers (mpeg2dec);
}
break;
case STATE_BUFFER:
done = TRUE;
break;
/* error */
case STATE_INVALID:
GST_VIDEO_DECODER_ERROR (decoder, 1, STREAM, DECODE,
("decoding error"), ("Reached libmpeg2 invalid state"), ret);
continue;
default:
GST_ERROR_OBJECT (mpeg2dec, "Unknown libmpeg2 state %d, FIXME", state);
ret = GST_FLOW_OK;
gst_video_codec_frame_unref (frame);
goto done;
}
if (ret != GST_FLOW_OK) {
GST_DEBUG_OBJECT (mpeg2dec, "exit loop, reason %s",
gst_flow_get_name (ret));
break;
}
}
gst_video_codec_frame_unref (frame);
done:
gst_buffer_unmap (buf, &minfo);
gst_buffer_unref (buf);
return ret;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return GST_ELEMENT_REGISTER (mpeg2dec, plugin);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
mpeg2dec,
"LibMpeg2 decoder", plugin_init, VERSION, "GPL", GST_PACKAGE_NAME,
GST_PACKAGE_ORIGIN);
Reference in a new issue View git blame Copy permalink