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#include <assert.h>
#include <SDL2/SDL.h>
#include <libavformat/avformat.h>
#include "kitchensink/internal/utils/kitlog.h"
#include "kitchensink/kiterror.h"
#include "kitchensink/internal/kitlibstate.h"
#include "kitchensink/internal/subtitle/kitsubtitle.h"
#include "kitchensink/internal/subtitle/renderers/kitsubimage.h"
#include "kitchensink/internal/subtitle/renderers/kitsubass.h"
#include "kitchensink/internal/subtitle/renderers/kitsubrenderer.h"
#include "kitchensink/internal/utils/kithelpers.h"
#define KIT_SUBTITLE_OUT_SIZE 32
typedef struct Kit_SubtitleDecoder {
Kit_SubtitleFormat *format;
Kit_SubtitleRenderer *renderer;
AVSubtitle scratch_frame;
int w;
int h;
int output_state;
} Kit_SubtitleDecoder;
typedef struct Kit_SubtitlePacket {
double pts_start;
double pts_end;
SDL_Surface *surface;
} Kit_SubtitlePacket;
static Kit_SubtitlePacket* _CreateSubtitlePacket(double pts_start, double pts_end, SDL_Surface *surface) {
Kit_SubtitlePacket *p = calloc(1, sizeof(Kit_SubtitlePacket));
p->pts_start = pts_start;
p->pts_end = pts_end;
p->surface = surface;
return p;
}
static void free_out_subtitle_packet_cb(void *packet) {
Kit_SubtitlePacket *p = packet;
SDL_FreeSurface(p->surface);
free(p);
}
static int dec_decode_subtitle_cb(Kit_Decoder *dec, AVPacket *in_packet) {
assert(dec != NULL);
assert(in_packet != NULL);
Kit_SubtitleDecoder *subtitle_dec = dec->userdata;
int frame_finished;
int len;
if(in_packet->size > 0) {
len = avcodec_decode_subtitle2(dec->codec_ctx, &subtitle_dec->scratch_frame, &frame_finished, in_packet);
if(len < 0) {
return 1;
}
if(frame_finished) {
// Start and end presentation timestamps for subtitle frame
double pts = 0;
if(in_packet->pts != AV_NOPTS_VALUE) {
pts = in_packet->pts;
pts *= av_q2d(dec->format_ctx->streams[dec->stream_index]->time_base);
}
double start = pts + (subtitle_dec->scratch_frame.start_display_time / 1000.0f);
double end = pts + (subtitle_dec->scratch_frame.end_display_time / 1000.0f);
// Surface to render on
SDL_Surface *surface = SDL_CreateRGBSurfaceWithFormat(
0, subtitle_dec->w, subtitle_dec->h, 32, SDL_PIXELFORMAT_RGBA32);
memset(surface->pixels, 0, surface->pitch * surface->h);
// Create a packet. This should be filled by renderer.
Kit_SubtitlePacket *out_packet = _CreateSubtitlePacket(start, end, surface);
int ret = Kit_RunSubtitleRenderer(
subtitle_dec->renderer, &subtitle_dec->scratch_frame, start, surface);
if(ret == -1) {
// Renderer failed, free packet.
free_out_subtitle_packet_cb(out_packet);
} else {
Kit_WriteDecoderOutput(dec, out_packet);
}
// Free subtitle since it has now been handled
avsubtitle_free(&subtitle_dec->scratch_frame);
}
}
return 1;
}
static void dec_close_subtitle_cb(Kit_Decoder *dec) {
if(dec == NULL) return;
Kit_SubtitleDecoder *subtitle_dec = dec->userdata;
Kit_CloseSubtitleRenderer(subtitle_dec->renderer);
free(subtitle_dec);
}
Kit_Decoder* Kit_CreateSubtitleDecoder(const Kit_Source *src, Kit_SubtitleFormat *format, int w, int h) {
assert(src != NULL);
assert(format != NULL);
if(src->subtitle_stream_index < 0) {
return NULL;
}
// First the generic decoder component
Kit_Decoder *dec = Kit_CreateDecoder(
src, src->subtitle_stream_index,
KIT_SUBTITLE_OUT_SIZE,
free_out_subtitle_packet_cb);
if(dec == NULL) {
goto exit_0;
}
// Set format. Note that is_enabled may be changed below ...
format->is_enabled = true;
format->stream_index = src->subtitle_stream_index;
format->format = SDL_PIXELFORMAT_RGBA32; // Always this
// ... then allocate the subtitle decoder
Kit_SubtitleDecoder *subtitle_dec = calloc(1, sizeof(Kit_SubtitleDecoder));
if(subtitle_dec == NULL) {
goto exit_1;
}
// For subtitles, we need a renderer for the stream. Pick one based on codec ID.
Kit_SubtitleRenderer *ren = NULL;
switch(dec->codec_ctx->codec_id) {
case AV_CODEC_ID_SSA:
case AV_CODEC_ID_ASS:
ren = Kit_CreateASSSubtitleRenderer(dec, w, h);
break;
case AV_CODEC_ID_DVD_SUBTITLE:
case AV_CODEC_ID_DVB_SUBTITLE:
case AV_CODEC_ID_HDMV_PGS_SUBTITLE:
case AV_CODEC_ID_XSUB:
format->is_enabled = false;
break;
default:
format->is_enabled = false;
break;
}
if(ren == NULL) {
goto exit_2;
}
// Set callbacks and userdata, and we're go
subtitle_dec->format = format;
subtitle_dec->renderer = ren;
subtitle_dec->w = w;
subtitle_dec->h = h;
dec->dec_decode = dec_decode_subtitle_cb;
dec->dec_close = dec_close_subtitle_cb;
dec->userdata = subtitle_dec;
return dec;
exit_2:
free(subtitle_dec);
exit_1:
Kit_CloseDecoder(dec);
exit_0:
return NULL;
}
int Kit_GetSubtitleDecoderData(Kit_Decoder *dec, SDL_Texture *texture) {
assert(dec != NULL);
assert(texture != NULL);
double sync_ts = _GetSystemTime() - dec->clock_sync;
char *clear_scr;
Kit_SubtitleDecoder *subtitle_dec = dec->userdata;
Kit_SubtitlePacket *packet = Kit_PeekDecoderOutput(dec);
if(packet == NULL) {
goto exit_0;
}
if(packet->pts_start > sync_ts) {
goto exit_0;
}
if(packet->pts_end < sync_ts) {
goto exit_1;
}
// Update the texture with our subtitle frame
SDL_UpdateTexture(
texture, NULL,
packet->surface->pixels,
packet->surface->pitch);
dec->clock_pos = sync_ts;
return 0;
// All done.
exit_1:
Kit_AdvanceDecoderOutput(dec);
free_out_subtitle_packet_cb(packet);
exit_0:
// Clear subtitle frame
clear_scr = calloc(1, subtitle_dec->h * subtitle_dec->w * 4);
SDL_UpdateTexture(texture, NULL, clear_scr, subtitle_dec->w * 4);
free(clear_scr);
return 0;
}
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