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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/kitlib.h"
#include "kitchensink/internal/utils/kitlog.h"
#include "kitchensink/internal/kitlibstate.h"
#include "kitchensink/internal/subtitle/kitsubtitlepacket.h"
#include "kitchensink/internal/subtitle/kitsubtitle.h"
#include "kitchensink/internal/subtitle/kitatlas.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 64
typedef struct Kit_SubtitleDecoder {
Kit_SubtitleFormat *format;
Kit_SubtitleRenderer *renderer;
AVSubtitle scratch_frame;
int w;
int h;
Kit_TextureAtlas *atlas;
} Kit_SubtitleDecoder;
static void free_out_subtitle_packet_cb(void *packet) {
Kit_FreeSubtitlePacket((Kit_SubtitlePacket*)packet);
}
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 = -1;
if(subtitle_dec->scratch_frame.end_display_time < UINT_MAX) {
end = pts + (subtitle_dec->scratch_frame.end_display_time / 1000.0f);
}
// Create a packet. This should be filled by renderer.
Kit_SubtitlePacket *out_packet = Kit_RunSubtitleRenderer(
subtitle_dec->renderer, &subtitle_dec->scratch_frame, start, end);
if(end < 0) {
Kit_ClearDecoderOutput(dec);
}
if(out_packet != NULL) {
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_FreeAtlas(subtitle_dec->atlas);
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;
}
Kit_LibraryState *library_state = Kit_GetLibraryState();
// 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_TEXT:
case AV_CODEC_ID_HDMV_TEXT_SUBTITLE:
case AV_CODEC_ID_SRT:
case AV_CODEC_ID_SUBRIP:
case AV_CODEC_ID_SSA:
case AV_CODEC_ID_ASS:
if(library_state->init_flags & KIT_INIT_ASS) {
ren = Kit_CreateASSSubtitleRenderer(dec, w, h);
} else {
format->is_enabled = false;
}
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:
ren = Kit_CreateImageSubtitleRenderer(dec, w, h);
break;
default:
format->is_enabled = false;
break;
}
if(ren == NULL) {
Kit_SetError("Unrecognized subtitle format");
goto exit_2;
}
// Allocate texture atlas for subtitle rectangles
Kit_TextureAtlas *atlas = Kit_CreateAtlas(1024, 1024);
if(atlas == NULL) {
Kit_SetError("Unable to allocate subtitle texture atlas");
goto exit_3;
}
// Set callbacks and userdata, and we're go
subtitle_dec->format = format;
subtitle_dec->renderer = ren;
subtitle_dec->w = w;
subtitle_dec->h = h;
subtitle_dec->atlas = atlas;
dec->dec_decode = dec_decode_subtitle_cb;
dec->dec_close = dec_close_subtitle_cb;
dec->userdata = subtitle_dec;
return dec;
exit_3:
Kit_CloseSubtitleRenderer(ren);
exit_2:
free(subtitle_dec);
exit_1:
Kit_CloseDecoder(dec);
exit_0:
return NULL;
}
int Kit_GetSubtitleDecoderData(Kit_Decoder *dec, SDL_Texture *texture, SDL_Rect *sources, SDL_Rect *targets, int limit) {
assert(dec != NULL);
assert(texture != NULL);
Kit_SubtitleDecoder *subtitle_dec = dec->userdata;
double sync_ts = _GetSystemTime() - dec->clock_sync;
// Tell the renderer to render content to atlas
Kit_GetSubtitleRendererData(subtitle_dec->renderer, subtitle_dec->atlas, sync_ts);
// Next, update the actual atlas texture contents. This may force the atlas to do partial or complete reordering
// OR it may simply be a texture update from cache.
if(Kit_UpdateAtlasTexture(subtitle_dec->atlas, texture) != 0) {
return -1;
}
// Next, get targets and sources of visible atlas items
int item_count = Kit_GetAtlasItems(subtitle_dec->atlas, sources, targets, limit);
// All done
dec->clock_pos = sync_ts;
return item_count;
}
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