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vlc/modules/codec/oggspots.c

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/*****************************************************************************
* oggspots.c: OggSpots decoder module.
*****************************************************************************
* Copyright (C) 2016 VLC authors and VideoLAN
*
* Authors: Michael Taenzer <neo@nhng.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_codec.h>
#include <vlc_image.h>
#include <assert.h>
#include <limits.h>
/*****************************************************************************
* decoder_sys_t : oggspots decoder descriptor
*****************************************************************************/
typedef struct
{
/* Module mode */
bool b_packetizer;
/*
* Input properties
*/
bool b_has_headers;
/*
* Image handler
*/
image_handler_t* p_image;
/*
* Common properties
*/
vlc_tick_t i_pts;
} decoder_sys_t;
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static int OpenDecoder (vlc_object_t*);
static int OpenPacketizer(vlc_object_t*);
static void CloseDecoder (vlc_object_t*);
static int DecodeVideo (decoder_t*, block_t*);
static block_t* Packetize (decoder_t*, block_t**);
static int ProcessHeader(decoder_t*);
static void* ProcessPacket(decoder_t*, block_t*);
static void Flush (decoder_t*);
static picture_t* DecodePacket (decoder_t*, block_t*);
/*****************************************************************************
* Module descriptor
*****************************************************************************/
vlc_module_begin ()
set_category(CAT_INPUT)
set_subcategory(SUBCAT_INPUT_VCODEC)
set_shortname("OggSpots")
set_description(N_("OggSpots video decoder"))
set_capability("video decoder", 10)
set_callbacks(OpenDecoder, CloseDecoder)
add_shortcut("oggspots")
add_submodule ()
set_description(N_("OggSpots video packetizer"))
set_capability("packetizer", 10)
set_callbacks(OpenPacketizer, CloseDecoder)
add_shortcut("oggspots")
vlc_module_end ()
static int OpenCommon(vlc_object_t* p_this, bool b_packetizer)
{
decoder_t* p_dec = (decoder_t*)p_this;
decoder_sys_t* p_sys;
if (p_dec->fmt_in.i_codec != VLC_CODEC_OGGSPOTS) {
return VLC_EGENERIC;
}
/* Allocate the memory needed to store the decoder's structure */
p_sys = malloc(sizeof(*p_sys));
if (p_sys == NULL) {
return VLC_ENOMEM;
}
p_dec->p_sys = p_sys;
p_sys->b_packetizer = b_packetizer;
p_sys->b_has_headers = false;
p_sys->i_pts = VLC_TICK_INVALID;
/* Initialize image handler */
p_sys->p_image = image_HandlerCreate(p_dec);
if (p_sys->p_image == NULL) {
free(p_sys);
return VLC_ENOMEM;
}
if( b_packetizer )
{
p_dec->fmt_out.i_codec = VLC_CODEC_OGGSPOTS;
p_dec->pf_packetize = Packetize;
}
else
{
p_dec->fmt_out.i_codec = VLC_CODEC_RGBA;
p_dec->pf_decode = DecodeVideo;
}
p_dec->pf_flush = Flush;
return VLC_SUCCESS;
}
/*****************************************************************************
* OpenDecoder: probe the decoder and return score
*****************************************************************************/
static int OpenDecoder(vlc_object_t* p_this)
{
return OpenCommon(p_this, false);
}
static int OpenPacketizer(vlc_object_t* p_this)
{
return OpenCommon(p_this, true);
}
/****************************************************************************
* DecodeBlock: the whole thing
****************************************************************************
* This function must be fed with ogg packets.
****************************************************************************/
static void* DecodeBlock(decoder_t* p_dec, block_t* p_block)
{
decoder_sys_t* p_sys = p_dec->p_sys;
/* Check for headers */
if (!p_sys->b_has_headers) {
if (ProcessHeader(p_dec)) {
block_Release(p_block);
return NULL;
}
p_sys->b_has_headers = true;
}
return ProcessPacket(p_dec, p_block);
}
static int DecodeVideo( decoder_t *p_dec, block_t *p_block )
{
if( p_block == NULL ) /* No Drain */
return VLCDEC_SUCCESS;
picture_t *p_pic = DecodeBlock( p_dec, p_block );
if( p_pic != NULL )
decoder_QueueVideo( p_dec, p_pic );
return VLCDEC_SUCCESS;
}
static block_t *Packetize( decoder_t *p_dec, block_t **pp_block )
{
if( pp_block == NULL ) /* No Drain */
return NULL;
block_t *p_block = *pp_block; *pp_block = NULL;
if( p_block == NULL )
return NULL;
return DecodeBlock( p_dec, p_block );
}
/*****************************************************************************
* ProcessHeader: process OggSpots header.
*****************************************************************************/
static int ProcessHeader(decoder_t* p_dec)
{
decoder_sys_t* p_sys = p_dec->p_sys;
const uint8_t* p_extra;
int i_major;
int i_minor;
uint64_t i_granulerate_numerator;
uint64_t i_granulerate_denominator;
/* The OggSpots header is always 52 bytes */
if (p_dec->fmt_in.i_extra != 52) {
return VLC_EGENERIC;
}
p_extra = p_dec->fmt_in.p_extra;
/* Identification string */
if ( memcmp(p_extra, "SPOTS\0\0", 8) ) {
return VLC_EGENERIC;
}
/* Version number */
i_major = GetWLE(&p_extra[ 8]); /* major version num */
i_minor = GetWLE(&p_extra[10]); /* minor version num */
if (i_major != 0 || i_minor != 1) {
return VLC_EGENERIC;
}
/* Granule rate */
i_granulerate_numerator = GetQWLE(&p_extra[12]);
i_granulerate_denominator = GetQWLE(&p_extra[20]);
if (i_granulerate_numerator == 0 || i_granulerate_denominator == 0) {
return VLC_EGENERIC;
}
/* The OggSpots spec contained an error and there are implementations out
* there that used the wrong value. So we detect that case and switch
* numerator and denominator in that case */
if (i_granulerate_numerator == 1 && i_granulerate_denominator == 30) {
i_granulerate_numerator = 30;
i_granulerate_denominator = 1;
}
/* Normalize granulerate */
vlc_ureduce(&p_dec->fmt_in.video.i_frame_rate,
&p_dec->fmt_in.video.i_frame_rate_base,
i_granulerate_numerator, i_granulerate_denominator, 0);
/* Image format */
if (!p_sys->b_packetizer) {
if ( memcmp(&p_extra[32], "PNG", 3) && memcmp(&p_extra[32], "JPEG", 4) ) {
char psz_image_type[8+1];
strncpy(psz_image_type, (char*)&p_extra[32], 8);
psz_image_type[sizeof(psz_image_type)-1] = '\0';
msg_Warn(p_dec, "Unsupported image format: %s", psz_image_type);
}
}
/* Dimensions */
p_dec->fmt_out.video.i_width = p_dec->fmt_out.video.i_visible_width =
GetWLE(&p_extra[40]);
p_dec->fmt_out.video.i_height = p_dec->fmt_out.video.i_visible_height =
GetWLE(&p_extra[42]);
/* We assume square pixels */
p_dec->fmt_out.video.i_sar_num = 1;
p_dec->fmt_out.video.i_sar_den = 1;
/* We don't implement background color, alignment and options at the
* moment because the former doesn't seem necessary right now and the
* latter are underspecified. */
if (p_sys->b_packetizer) {
void* p_new_extra = realloc(p_dec->fmt_out.p_extra,
p_dec->fmt_in.i_extra);
if (unlikely(p_new_extra == NULL)) {
return VLC_ENOMEM;
}
p_dec->fmt_out.p_extra = p_new_extra;
p_dec->fmt_out.i_extra = p_dec->fmt_in.i_extra;
memcpy(p_dec->fmt_out.p_extra,
p_dec->fmt_in.p_extra, p_dec->fmt_out.i_extra);
}
return VLC_SUCCESS;
}
/*****************************************************************************
* Flush:
*****************************************************************************/
static void Flush(decoder_t* p_dec)
{
decoder_sys_t* p_sys = p_dec->p_sys;
p_sys->i_pts = VLC_TICK_INVALID;
}
/*****************************************************************************
* ProcessPacket: processes an OggSpots packet.
*****************************************************************************/
static void* ProcessPacket(decoder_t* p_dec, block_t* p_block)
{
decoder_sys_t* p_sys = p_dec->p_sys;
void* p_buf;
if ( (p_block->i_flags & BLOCK_FLAG_DISCONTINUITY) != 0 ) {
p_sys->i_pts = p_block->i_pts;
}
if ( (p_block->i_flags & BLOCK_FLAG_CORRUPTED) != 0 ) {
block_Release(p_block);
return NULL;
}
/* Date management */
if (p_block->i_pts != VLC_TICK_INVALID && p_block->i_pts != p_sys->i_pts) {
p_sys->i_pts = p_block->i_pts;
}
if (p_sys->b_packetizer) {
/* Date management */
/* FIXME: This is copied from theora but it looks wrong.
* p_block->i_length will always be zero. */
p_block->i_dts = p_block->i_pts = p_sys->i_pts;
p_block->i_length = p_sys->i_pts - p_block->i_pts;
p_buf = p_block;
}
else {
p_buf = DecodePacket(p_dec, p_block);
}
return p_buf;
}
/*****************************************************************************
* DecodePacket: decodes an OggSpots packet.
*****************************************************************************/
static picture_t* DecodePacket(decoder_t* p_dec, block_t* p_block)
{
decoder_sys_t* p_sys = p_dec->p_sys;
uint32_t i_img_offset;
picture_t* p_pic;
if (p_block->i_buffer < 20) {
msg_Dbg(p_dec, "Packet too short");
goto error;
}
/* Byte offset */
i_img_offset = GetDWLE(p_block->p_buffer);
if (i_img_offset < 20) {
msg_Dbg(p_dec, "Invalid byte offset");
goto error;
}
/* Image format */
if ( !memcmp(&p_block->p_buffer[4], "PNG", 3) ) {
p_dec->fmt_in.video.i_chroma = VLC_CODEC_PNG;
}
else if ( !memcmp(&p_block->p_buffer[4], "JPEG", 4) ) {
p_dec->fmt_in.video.i_chroma = VLC_CODEC_JPEG;
}
else {
char psz_image_type[8+1];
strncpy(psz_image_type, (char*)&p_block->p_buffer[4], 8);
psz_image_type[sizeof(psz_image_type)-1] = '\0';
msg_Dbg(p_dec, "Unsupported image format: %s", psz_image_type);
goto error;
}
/* We currently ignore the rest of the header and let the image format
* handle the details */
p_block->i_buffer -= i_img_offset;
p_block->p_buffer += i_img_offset;
p_pic = image_Read(p_sys->p_image, p_block,
&p_dec->fmt_in,
&p_dec->fmt_out.video);
if (p_pic == NULL) {
return NULL;
}
p_pic->b_force = true;
p_dec->fmt_out.i_codec = p_dec->fmt_out.video.i_chroma;
decoder_UpdateVideoFormat(p_dec);
return p_pic;
error:
block_Release(p_block);
return NULL;
}
/*****************************************************************************
* CloseDecoder: OggSpots decoder destruction
*****************************************************************************/
static void CloseDecoder(vlc_object_t* p_this)
{
decoder_t* p_dec = (decoder_t*)p_this;
decoder_sys_t* p_sys = p_dec->p_sys;
image_HandlerDelete(p_sys->p_image);
free(p_sys);
}
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