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gstreamer/ext/mpeg2dec/gstmpeg2dec.c
Tim-Philipp Müller 9c690b2018 Fix FSF address 
https://bugzilla.gnome.org/show_bug.cgi?id=687520
2012-11-03 20:40:37 +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., 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)))
/* 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)
GST_DEBUG_CATEGORY_EXTERN (GST_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);
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_reset (GstVideoDecoder * decoder, gboolean hard);
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_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));
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->reset = GST_DEBUG_FUNCPTR (gst_mpeg2dec_reset);
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");
}
static void
gst_mpeg2dec_init (GstMpeg2dec * mpeg2dec)
{
gst_video_decoder_set_packetized (GST_VIDEO_DECODER (mpeg2dec), 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;
}
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_start (GstVideoDecoder * decoder)
{
return gst_mpeg2dec_reset (decoder, TRUE);
}
static gboolean
gst_mpeg2dec_stop (GstVideoDecoder * decoder)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (decoder);
if (mpeg2dec->input_state) {
gst_video_codec_state_unref (mpeg2dec->input_state);
mpeg2dec->input_state = NULL;
}
return gst_mpeg2dec_reset (decoder, 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_reset (GstVideoDecoder * decoder, gboolean hard)
{
GstMpeg2dec *mpeg2dec = GST_MPEG2DEC (decoder);
GST_DEBUG_OBJECT (mpeg2dec, "%s", hard ? "hard" : "soft");
/* reset the initial video state */
mpeg2dec->discont_state = MPEG2DEC_DISC_NEW_PICTURE;
mpeg2_reset (mpeg2dec->decoder, hard);
mpeg2_skip (mpeg2dec->decoder, 1);
gst_mpeg2dec_clear_buffers (mpeg2dec);
return TRUE;
}
static GstFlowReturn
gst_mpeg2dec_finish (GstVideoDecoder * decoder)
{
return GST_FLOW_OK;
}
static gboolean
gst_mpeg2dec_decide_allocation (GstVideoDecoder * decoder, GstQuery * query)
{
GstMpeg2dec *dec = GST_MPEG2DEC (decoder);
GstVideoCodecState *state;
GstBufferPool *pool;
guint size, min, max;
GstStructure *config;
GstAllocator *allocator;
GstAllocationParams params;
gboolean update_allocator;
/* 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);
if (allocator)
gst_object_unref (allocator);
/* 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))
return FALSE;
state = gst_video_decoder_get_output_state (decoder);
gst_query_parse_nth_allocation_pool (query, 0, &pool, &size, &min, &max);
dec->has_cropping = FALSE;
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);
dec->has_cropping =
gst_query_find_allocation_meta (query, GST_VIDEO_CROP_META_API_TYPE,
NULL);
}
if (dec->has_cropping) {
GstCaps *caps;
/* Calculate uncropped size */
size = MAX (size, dec->decoded_info.size);
caps = gst_video_info_to_caps (&dec->decoded_info);
gst_buffer_pool_config_set_params (config, caps, size, min, max);
gst_caps_unref (caps);
}
gst_buffer_pool_set_config (pool, config);
gst_query_set_nth_allocation_pool (query, 0, pool, size, min, max);
gst_object_unref (pool);
gst_video_codec_state_unref (state);
return TRUE;
}
static GstFlowReturn
gst_mpeg2dec_crop_buffer (GstMpeg2dec * dec, GstVideoCodecFrame * in_frame,
GstVideoFrame * input_vframe)
{
GstVideoCodecState *state;
GstVideoInfo *info;
GstVideoInfo *dinfo;
guint c, n_planes;
GstVideoFrame output_frame;
GstFlowReturn ret;
state = gst_video_decoder_get_output_state (GST_VIDEO_DECODER (dec));
info = &state->info;
dinfo = &dec->decoded_info;
GST_CAT_LOG_OBJECT (GST_CAT_PERFORMANCE, dec,
"Copying input buffer %ux%u (%u) to output buffer "
"%ux%u (%u)", dinfo->width, dinfo->height,
dinfo->size, info->width, info->height, info->size);
ret =
gst_video_decoder_allocate_output_frame (GST_VIDEO_DECODER (dec),
in_frame);
if (ret != GST_FLOW_OK)
goto beach;
if (!gst_video_frame_map (&output_frame, info, in_frame->output_buffer,
GST_MAP_WRITE))
goto map_fail;
n_planes = GST_VIDEO_FRAME_N_PLANES (&output_frame);
for (c = 0; c < n_planes; c++) {
guint w, h, j;
guint8 *sp, *dp;
gint ss, ds;
sp = GST_VIDEO_FRAME_PLANE_DATA (input_vframe, c);
dp = GST_VIDEO_FRAME_PLANE_DATA (&output_frame, c);
ss = GST_VIDEO_FRAME_PLANE_STRIDE (input_vframe, c);
ds = GST_VIDEO_FRAME_PLANE_STRIDE (&output_frame, c);
w = MIN (ABS (ss), ABS (ds));
h = GST_VIDEO_FRAME_COMP_HEIGHT (&output_frame, c);
GST_CAT_DEBUG (GST_CAT_PERFORMANCE, "copy plane %u, w:%u h:%u ", c, w, h);
for (j = 0; j < h; j++) {
memcpy (dp, sp, w);
dp += ds;
sp += ss;
}
}
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;
}
}
static void
frame_user_data_destroy_notify (GstBuffer * buf)
{
GST_DEBUG ("Releasing buffer %p", buf);
if (buf)
gst_buffer_unref (buf);
}
static GstFlowReturn
gst_mpeg2dec_alloc_sized_buf (GstMpeg2dec * mpeg2dec, guint size,
GstVideoCodecFrame * frame, GstBuffer ** buffer)
{
GstFlowReturn ret = GST_FLOW_OK;
GstVideoCodecState *state;
state = gst_video_decoder_get_output_state (GST_VIDEO_DECODER (mpeg2dec));
if (!mpeg2dec->need_cropping || mpeg2dec->has_cropping) {
ret =
gst_video_decoder_allocate_output_frame (GST_VIDEO_DECODER (mpeg2dec),
frame);
*buffer = frame->output_buffer;
} else {
GstAllocationParams params = { 0, 15, 0, 0 };
*buffer = gst_buffer_new_allocate (NULL, size, &params);
gst_video_codec_frame_set_user_data (frame, *buffer,
(GDestroyNotify) frame_user_data_destroy_notify);
}
gst_video_codec_state_unref (state);
return ret;
}
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 GstFlowReturn
gst_mpeg2dec_alloc_buffer (GstMpeg2dec * mpeg2dec, GstVideoCodecFrame * frame,
GstBuffer ** buffer)
{
GstFlowReturn ret;
GstVideoFrame vframe;
guint8 *buf[3];
ret =
gst_mpeg2dec_alloc_sized_buf (mpeg2dec, mpeg2dec->decoded_info.size,
frame, buffer);
if (G_UNLIKELY (ret != GST_FLOW_OK))
goto beach;
if (mpeg2dec->need_cropping && mpeg2dec->has_cropping) {
GstVideoCropMeta *crop;
GstVideoCodecState *state;
GstVideoInfo *vinfo;
state = gst_video_decoder_get_output_state (GST_VIDEO_DECODER (mpeg2dec));
vinfo = &state->info;
crop = gst_buffer_add_video_crop_meta (frame->output_buffer);
/* we can do things slightly more efficient when we know that
* downstream understands clipping */
crop->x = 0;
crop->y = 0;
crop->width = vinfo->width;
crop->height = vinfo->height;
gst_video_codec_state_unref (state);
}
if (!gst_video_frame_map (&vframe, &mpeg2dec->decoded_info, *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_set_buf (mpeg2dec->decoder, buf,
GINT_TO_POINTER (frame->system_frame_number + 1));
gst_mpeg2dec_save_buffer (mpeg2dec, frame->system_frame_number, &vframe);
beach:
return ret;
map_fail:
{
GST_ERROR_OBJECT (mpeg2dec, "Failed to map frame");
return GST_FLOW_ERROR;
}
}
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 *dinfo = &mpeg2dec->decoded_info;
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);
if (sequence->picture_width != sequence->width ||
sequence->picture_height != sequence->height) {
GST_DEBUG_OBJECT (mpeg2dec, "we need to crop");
mpeg2dec->need_cropping = TRUE;
} else {
GST_DEBUG_OBJECT (mpeg2dec, "no cropping needed");
mpeg2dec->need_cropping = FALSE;
}
/* 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) {
GST_DEBUG_OBJECT (mpeg2dec, "Setting PAR %d x %d",
sequence->pixel_width, sequence->pixel_height);
vinfo->par_n = sequence->pixel_width;
vinfo->par_d = sequence->pixel_height;
}
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 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, 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);
/* we store the codec size before cropping */
*dinfo = *vinfo;
gst_video_info_set_format (dinfo, format, sequence->width, sequence->height);
/* Mpeg2dec has 2 frame latency to produce a picture and 1 frame latency in
* it's parser */
latency = gst_util_uint64_scale (3, 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;
}
negotiation_fail:
{
GST_WARNING_OBJECT (mpeg2dec, "Failed to negotiate with downstream");
return GST_FLOW_ERROR;
}
}
static GstFlowReturn
handle_picture (GstMpeg2dec * mpeg2dec, const mpeg2_info_t * info,
GstVideoCodecFrame * frame)
{
GstFlowReturn ret;
gint type;
const gchar *type_str = NULL;
gboolean key_frame = FALSE;
const mpeg2_picture_t *picture = info->current_picture;
GstBuffer *buffer;
ret = gst_mpeg2dec_alloc_buffer (mpeg2dec, frame, &buffer);
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 (buffer, GST_VIDEO_BUFFER_FLAG_TFF);
}
if (!(picture->flags & PIC_FLAG_PROGRESSIVE_FRAME)) {
GST_BUFFER_FLAG_SET (buffer, GST_VIDEO_BUFFER_FLAG_INTERLACED);
}
#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 (buffer, GST_VIDEO_BUFFER_FLAG_RFF);
}
#endif
}
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" : " "),
#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_TIME_ARGS (frame->pts));
return ret;
}
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;
GstVideoCodecState *state;
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;
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;
}
if (mpeg2dec->discont_state != MPEG2DEC_DISC_NONE) {
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;
}
state = gst_video_decoder_get_output_state (GST_VIDEO_DECODER (mpeg2dec));
/* do cropping if the target region is smaller than the input one */
if (mpeg2dec->need_cropping && !mpeg2dec->has_cropping) {
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");
ret = gst_video_decoder_drop_frame (GST_VIDEO_DECODER (mpeg2dec), frame);
goto beach;
}
GST_DEBUG_OBJECT (mpeg2dec, "cropping buffer");
vframe = gst_mpeg2dec_get_buffer (mpeg2dec, frame->system_frame_number);
g_assert (vframe != NULL);
ret = gst_mpeg2dec_crop_buffer (mpeg2dec, frame, vframe);
}
ret = gst_video_decoder_finish_frame (GST_VIDEO_DECODER (mpeg2dec), frame);
beach:
gst_video_codec_state_unref (state);
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");
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) {
#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) {
GST_VIDEO_DECODER_ERROR (decoder, 1, STREAM, DECODE,
("decoding error"), ("Bad sequence header"), ret);
gst_video_decoder_drop_frame (decoder, frame);
gst_mpeg2dec_reset (decoder, 0);
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;
#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");
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)
{
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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