From 8992cb1d0d07edc33d274f6d7924ecdf6f83d994 Mon Sep 17 00:00:00 2001 From: Tim Redfern Date: Thu, 5 Sep 2013 17:57:22 +0100 Subject: making act segmenter --- ffmpeg/libavcodec/dvbsubdec.c | 1546 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1546 insertions(+) create mode 100644 ffmpeg/libavcodec/dvbsubdec.c (limited to 'ffmpeg/libavcodec/dvbsubdec.c') diff --git a/ffmpeg/libavcodec/dvbsubdec.c b/ffmpeg/libavcodec/dvbsubdec.c new file mode 100644 index 0000000..955925a --- /dev/null +++ b/ffmpeg/libavcodec/dvbsubdec.c @@ -0,0 +1,1546 @@ +/* + * DVB subtitle decoding + * Copyright (c) 2005 Ian Caulfield + * + * This file is part of FFmpeg. + * + * FFmpeg 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. + * + * FFmpeg 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 FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include "avcodec.h" +#include "dsputil.h" +#include "get_bits.h" +#include "bytestream.h" +#include "libavutil/colorspace.h" + +#define DVBSUB_PAGE_SEGMENT 0x10 +#define DVBSUB_REGION_SEGMENT 0x11 +#define DVBSUB_CLUT_SEGMENT 0x12 +#define DVBSUB_OBJECT_SEGMENT 0x13 +#define DVBSUB_DISPLAYDEFINITION_SEGMENT 0x14 +#define DVBSUB_DISPLAY_SEGMENT 0x80 + +#define cm (ff_cropTbl + MAX_NEG_CROP) + +#ifdef DEBUG +#undef fprintf +#undef perror +#if 0 +static void png_save(const char *filename, uint8_t *bitmap, int w, int h, + uint32_t *rgba_palette) +{ + int x, y, v; + FILE *f; + char fname[40], fname2[40]; + char command[1024]; + + snprintf(fname, 40, "%s.ppm", filename); + + f = fopen(fname, "w"); + if (!f) { + perror(fname); + return; + } + fprintf(f, "P6\n" + "%d %d\n" + "%d\n", + w, h, 255); + for(y = 0; y < h; y++) { + for(x = 0; x < w; x++) { + v = rgba_palette[bitmap[y * w + x]]; + putc((v >> 16) & 0xff, f); + putc((v >> 8) & 0xff, f); + putc((v >> 0) & 0xff, f); + } + } + fclose(f); + + + snprintf(fname2, 40, "%s-a.pgm", filename); + + f = fopen(fname2, "w"); + if (!f) { + perror(fname2); + return; + } + fprintf(f, "P5\n" + "%d %d\n" + "%d\n", + w, h, 255); + for(y = 0; y < h; y++) { + for(x = 0; x < w; x++) { + v = rgba_palette[bitmap[y * w + x]]; + putc((v >> 24) & 0xff, f); + } + } + fclose(f); + + snprintf(command, 1024, "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename); + system(command); + + snprintf(command, 1024, "rm %s %s", fname, fname2); + system(command); +} +#endif + +static void png_save2(const char *filename, uint32_t *bitmap, int w, int h) +{ + int x, y, v; + FILE *f; + char fname[40], fname2[40]; + char command[1024]; + + snprintf(fname, sizeof(fname), "%s.ppm", filename); + + f = fopen(fname, "w"); + if (!f) { + perror(fname); + return; + } + fprintf(f, "P6\n" + "%d %d\n" + "%d\n", + w, h, 255); + for(y = 0; y < h; y++) { + for(x = 0; x < w; x++) { + v = bitmap[y * w + x]; + putc((v >> 16) & 0xff, f); + putc((v >> 8) & 0xff, f); + putc((v >> 0) & 0xff, f); + } + } + fclose(f); + + + snprintf(fname2, sizeof(fname2), "%s-a.pgm", filename); + + f = fopen(fname2, "w"); + if (!f) { + perror(fname2); + return; + } + fprintf(f, "P5\n" + "%d %d\n" + "%d\n", + w, h, 255); + for(y = 0; y < h; y++) { + for(x = 0; x < w; x++) { + v = bitmap[y * w + x]; + putc((v >> 24) & 0xff, f); + } + } + fclose(f); + + snprintf(command, sizeof(command), "pnmtopng -alpha %s %s > %s.png 2> /dev/null", fname2, fname, filename); + system(command); + + snprintf(command, sizeof(command), "rm %s %s", fname, fname2); + system(command); +} +#endif + +#define RGBA(r,g,b,a) (((unsigned)(a) << 24) | ((r) << 16) | ((g) << 8) | (b)) + +typedef struct DVBSubCLUT { + int id; + int version; + + uint32_t clut4[4]; + uint32_t clut16[16]; + uint32_t clut256[256]; + + struct DVBSubCLUT *next; +} DVBSubCLUT; + +static DVBSubCLUT default_clut; + +typedef struct DVBSubObjectDisplay { + int object_id; + int region_id; + + int x_pos; + int y_pos; + + int fgcolor; + int bgcolor; + + struct DVBSubObjectDisplay *region_list_next; + struct DVBSubObjectDisplay *object_list_next; +} DVBSubObjectDisplay; + +typedef struct DVBSubObject { + int id; + int version; + + int type; + + DVBSubObjectDisplay *display_list; + + struct DVBSubObject *next; +} DVBSubObject; + +typedef struct DVBSubRegionDisplay { + int region_id; + + int x_pos; + int y_pos; + + struct DVBSubRegionDisplay *next; +} DVBSubRegionDisplay; + +typedef struct DVBSubRegion { + int id; + int version; + + int width; + int height; + int depth; + + int clut; + int bgcolor; + + uint8_t *pbuf; + int buf_size; + int dirty; + + DVBSubObjectDisplay *display_list; + + struct DVBSubRegion *next; +} DVBSubRegion; + +typedef struct DVBSubDisplayDefinition { + int version; + + int x; + int y; + int width; + int height; +} DVBSubDisplayDefinition; + +typedef struct DVBSubContext { + int composition_id; + int ancillary_id; + + int version; + int time_out; + DVBSubRegion *region_list; + DVBSubCLUT *clut_list; + DVBSubObject *object_list; + + int display_list_size; + DVBSubRegionDisplay *display_list; + DVBSubDisplayDefinition *display_definition; +} DVBSubContext; + + +static DVBSubObject* get_object(DVBSubContext *ctx, int object_id) +{ + DVBSubObject *ptr = ctx->object_list; + + while (ptr && ptr->id != object_id) { + ptr = ptr->next; + } + + return ptr; +} + +static DVBSubCLUT* get_clut(DVBSubContext *ctx, int clut_id) +{ + DVBSubCLUT *ptr = ctx->clut_list; + + while (ptr && ptr->id != clut_id) { + ptr = ptr->next; + } + + return ptr; +} + +static DVBSubRegion* get_region(DVBSubContext *ctx, int region_id) +{ + DVBSubRegion *ptr = ctx->region_list; + + while (ptr && ptr->id != region_id) { + ptr = ptr->next; + } + + return ptr; +} + +static void delete_region_display_list(DVBSubContext *ctx, DVBSubRegion *region) +{ + DVBSubObject *object, *obj2, **obj2_ptr; + DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr; + + while (region->display_list) { + display = region->display_list; + + object = get_object(ctx, display->object_id); + + if (object) { + obj_disp_ptr = &object->display_list; + obj_disp = *obj_disp_ptr; + + while (obj_disp && obj_disp != display) { + obj_disp_ptr = &obj_disp->object_list_next; + obj_disp = *obj_disp_ptr; + } + + if (obj_disp) { + *obj_disp_ptr = obj_disp->object_list_next; + + if (!object->display_list) { + obj2_ptr = &ctx->object_list; + obj2 = *obj2_ptr; + + while (obj2 != object) { + assert(obj2); + obj2_ptr = &obj2->next; + obj2 = *obj2_ptr; + } + + *obj2_ptr = obj2->next; + + av_free(obj2); + } + } + } + + region->display_list = display->region_list_next; + + av_free(display); + } + +} + +static void delete_cluts(DVBSubContext *ctx) +{ + DVBSubCLUT *clut; + + while (ctx->clut_list) { + clut = ctx->clut_list; + + ctx->clut_list = clut->next; + + av_free(clut); + } +} + +static void delete_objects(DVBSubContext *ctx) +{ + DVBSubObject *object; + + while (ctx->object_list) { + object = ctx->object_list; + + ctx->object_list = object->next; + + av_free(object); + } +} + +static void delete_regions(DVBSubContext *ctx) +{ + DVBSubRegion *region; + + while (ctx->region_list) { + region = ctx->region_list; + + ctx->region_list = region->next; + + delete_region_display_list(ctx, region); + + av_free(region->pbuf); + av_free(region); + } +} + +static av_cold int dvbsub_init_decoder(AVCodecContext *avctx) +{ + int i, r, g, b, a = 0; + DVBSubContext *ctx = avctx->priv_data; + + if (!avctx->extradata || avctx->extradata_size != 4) { + av_log(avctx, AV_LOG_WARNING, "Invalid extradata, subtitle streams may be combined!\n"); + ctx->composition_id = -1; + ctx->ancillary_id = -1; + } else { + ctx->composition_id = AV_RB16(avctx->extradata); + ctx->ancillary_id = AV_RB16(avctx->extradata + 2); + } + + ctx->version = -1; + + default_clut.id = -1; + default_clut.next = NULL; + + default_clut.clut4[0] = RGBA( 0, 0, 0, 0); + default_clut.clut4[1] = RGBA(255, 255, 255, 255); + default_clut.clut4[2] = RGBA( 0, 0, 0, 255); + default_clut.clut4[3] = RGBA(127, 127, 127, 255); + + default_clut.clut16[0] = RGBA( 0, 0, 0, 0); + for (i = 1; i < 16; i++) { + if (i < 8) { + r = (i & 1) ? 255 : 0; + g = (i & 2) ? 255 : 0; + b = (i & 4) ? 255 : 0; + } else { + r = (i & 1) ? 127 : 0; + g = (i & 2) ? 127 : 0; + b = (i & 4) ? 127 : 0; + } + default_clut.clut16[i] = RGBA(r, g, b, 255); + } + + default_clut.clut256[0] = RGBA( 0, 0, 0, 0); + for (i = 1; i < 256; i++) { + if (i < 8) { + r = (i & 1) ? 255 : 0; + g = (i & 2) ? 255 : 0; + b = (i & 4) ? 255 : 0; + a = 63; + } else { + switch (i & 0x88) { + case 0x00: + r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0); + g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0); + b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0); + a = 255; + break; + case 0x08: + r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0); + g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0); + b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0); + a = 127; + break; + case 0x80: + r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0); + g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0); + b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0); + a = 255; + break; + case 0x88: + r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0); + g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0); + b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0); + a = 255; + break; + } + } + default_clut.clut256[i] = RGBA(r, g, b, a); + } + + return 0; +} + +static av_cold int dvbsub_close_decoder(AVCodecContext *avctx) +{ + DVBSubContext *ctx = avctx->priv_data; + DVBSubRegionDisplay *display; + + delete_regions(ctx); + + delete_objects(ctx); + + delete_cluts(ctx); + + av_freep(&ctx->display_definition); + + while (ctx->display_list) { + display = ctx->display_list; + ctx->display_list = display->next; + + av_free(display); + } + + return 0; +} + +static int dvbsub_read_2bit_string(uint8_t *destbuf, int dbuf_len, + const uint8_t **srcbuf, int buf_size, + int non_mod, uint8_t *map_table, int x_pos) +{ + GetBitContext gb; + + int bits; + int run_length; + int pixels_read = x_pos; + + init_get_bits(&gb, *srcbuf, buf_size << 3); + + destbuf += x_pos; + + while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) { + bits = get_bits(&gb, 2); + + if (bits) { + if (non_mod != 1 || bits != 1) { + if (map_table) + *destbuf++ = map_table[bits]; + else + *destbuf++ = bits; + } + pixels_read++; + } else { + bits = get_bits1(&gb); + if (bits == 1) { + run_length = get_bits(&gb, 3) + 3; + bits = get_bits(&gb, 2); + + if (non_mod == 1 && bits == 1) + pixels_read += run_length; + else { + if (map_table) + bits = map_table[bits]; + while (run_length-- > 0 && pixels_read < dbuf_len) { + *destbuf++ = bits; + pixels_read++; + } + } + } else { + bits = get_bits1(&gb); + if (bits == 0) { + bits = get_bits(&gb, 2); + if (bits == 2) { + run_length = get_bits(&gb, 4) + 12; + bits = get_bits(&gb, 2); + + if (non_mod == 1 && bits == 1) + pixels_read += run_length; + else { + if (map_table) + bits = map_table[bits]; + while (run_length-- > 0 && pixels_read < dbuf_len) { + *destbuf++ = bits; + pixels_read++; + } + } + } else if (bits == 3) { + run_length = get_bits(&gb, 8) + 29; + bits = get_bits(&gb, 2); + + if (non_mod == 1 && bits == 1) + pixels_read += run_length; + else { + if (map_table) + bits = map_table[bits]; + while (run_length-- > 0 && pixels_read < dbuf_len) { + *destbuf++ = bits; + pixels_read++; + } + } + } else if (bits == 1) { + if (map_table) + bits = map_table[0]; + else + bits = 0; + run_length = 2; + while (run_length-- > 0 && pixels_read < dbuf_len) { + *destbuf++ = bits; + pixels_read++; + } + } else { + (*srcbuf) += (get_bits_count(&gb) + 7) >> 3; + return pixels_read; + } + } else { + if (map_table) + bits = map_table[0]; + else + bits = 0; + *destbuf++ = bits; + pixels_read++; + } + } + } + } + + if (get_bits(&gb, 6)) + av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n"); + + (*srcbuf) += (get_bits_count(&gb) + 7) >> 3; + + return pixels_read; +} + +static int dvbsub_read_4bit_string(uint8_t *destbuf, int dbuf_len, + const uint8_t **srcbuf, int buf_size, + int non_mod, uint8_t *map_table, int x_pos) +{ + GetBitContext gb; + + int bits; + int run_length; + int pixels_read = x_pos; + + init_get_bits(&gb, *srcbuf, buf_size << 3); + + destbuf += x_pos; + + while (get_bits_count(&gb) < buf_size << 3 && pixels_read < dbuf_len) { + bits = get_bits(&gb, 4); + + if (bits) { + if (non_mod != 1 || bits != 1) { + if (map_table) + *destbuf++ = map_table[bits]; + else + *destbuf++ = bits; + } + pixels_read++; + } else { + bits = get_bits1(&gb); + if (bits == 0) { + run_length = get_bits(&gb, 3); + + if (run_length == 0) { + (*srcbuf) += (get_bits_count(&gb) + 7) >> 3; + return pixels_read; + } + + run_length += 2; + + if (map_table) + bits = map_table[0]; + else + bits = 0; + + while (run_length-- > 0 && pixels_read < dbuf_len) { + *destbuf++ = bits; + pixels_read++; + } + } else { + bits = get_bits1(&gb); + if (bits == 0) { + run_length = get_bits(&gb, 2) + 4; + bits = get_bits(&gb, 4); + + if (non_mod == 1 && bits == 1) + pixels_read += run_length; + else { + if (map_table) + bits = map_table[bits]; + while (run_length-- > 0 && pixels_read < dbuf_len) { + *destbuf++ = bits; + pixels_read++; + } + } + } else { + bits = get_bits(&gb, 2); + if (bits == 2) { + run_length = get_bits(&gb, 4) + 9; + bits = get_bits(&gb, 4); + + if (non_mod == 1 && bits == 1) + pixels_read += run_length; + else { + if (map_table) + bits = map_table[bits]; + while (run_length-- > 0 && pixels_read < dbuf_len) { + *destbuf++ = bits; + pixels_read++; + } + } + } else if (bits == 3) { + run_length = get_bits(&gb, 8) + 25; + bits = get_bits(&gb, 4); + + if (non_mod == 1 && bits == 1) + pixels_read += run_length; + else { + if (map_table) + bits = map_table[bits]; + while (run_length-- > 0 && pixels_read < dbuf_len) { + *destbuf++ = bits; + pixels_read++; + } + } + } else if (bits == 1) { + if (map_table) + bits = map_table[0]; + else + bits = 0; + run_length = 2; + while (run_length-- > 0 && pixels_read < dbuf_len) { + *destbuf++ = bits; + pixels_read++; + } + } else { + if (map_table) + bits = map_table[0]; + else + bits = 0; + *destbuf++ = bits; + pixels_read ++; + } + } + } + } + } + + if (get_bits(&gb, 8)) + av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n"); + + (*srcbuf) += (get_bits_count(&gb) + 7) >> 3; + + return pixels_read; +} + +static int dvbsub_read_8bit_string(uint8_t *destbuf, int dbuf_len, + const uint8_t **srcbuf, int buf_size, + int non_mod, uint8_t *map_table, int x_pos) +{ + const uint8_t *sbuf_end = (*srcbuf) + buf_size; + int bits; + int run_length; + int pixels_read = x_pos; + + destbuf += x_pos; + + while (*srcbuf < sbuf_end && pixels_read < dbuf_len) { + bits = *(*srcbuf)++; + + if (bits) { + if (non_mod != 1 || bits != 1) { + if (map_table) + *destbuf++ = map_table[bits]; + else + *destbuf++ = bits; + } + pixels_read++; + } else { + bits = *(*srcbuf)++; + run_length = bits & 0x7f; + if ((bits & 0x80) == 0) { + if (run_length == 0) { + return pixels_read; + } + + if (map_table) + bits = map_table[0]; + else + bits = 0; + while (run_length-- > 0 && pixels_read < dbuf_len) { + *destbuf++ = bits; + pixels_read++; + } + } else { + bits = *(*srcbuf)++; + + if (non_mod == 1 && bits == 1) + pixels_read += run_length; + if (map_table) + bits = map_table[bits]; + else while (run_length-- > 0 && pixels_read < dbuf_len) { + *destbuf++ = bits; + pixels_read++; + } + } + } + } + + if (*(*srcbuf)++) + av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n"); + + return pixels_read; +} + + + +static void dvbsub_parse_pixel_data_block(AVCodecContext *avctx, DVBSubObjectDisplay *display, + const uint8_t *buf, int buf_size, int top_bottom, int non_mod) +{ + DVBSubContext *ctx = avctx->priv_data; + + DVBSubRegion *region = get_region(ctx, display->region_id); + const uint8_t *buf_end = buf + buf_size; + uint8_t *pbuf; + int x_pos, y_pos; + int i; + + uint8_t map2to4[] = { 0x0, 0x7, 0x8, 0xf}; + uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff}; + uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, + 0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff}; + uint8_t *map_table; + +#if 0 + av_dlog(avctx, "DVB pixel block size %d, %s field:\n", buf_size, + top_bottom ? "bottom" : "top"); + + for (i = 0; i < buf_size; i++) { + if (i % 16 == 0) + av_dlog(avctx, "0x%8p: ", buf+i); + + av_dlog(avctx, "%02x ", buf[i]); + if (i % 16 == 15) + av_dlog(avctx, "\n"); + } + + if (i % 16) + av_dlog(avctx, "\n"); +#endif + + if (region == 0) + return; + + pbuf = region->pbuf; + region->dirty = 1; + + x_pos = display->x_pos; + y_pos = display->y_pos; + + y_pos += top_bottom; + + while (buf < buf_end) { + if ((*buf!=0xf0 && x_pos >= region->width) || y_pos >= region->height) { + av_log(avctx, AV_LOG_ERROR, "Invalid object location! %d-%d %d-%d %02x\n", x_pos, region->width, y_pos, region->height, *buf); + return; + } + + switch (*buf++) { + case 0x10: + if (region->depth == 8) + map_table = map2to8; + else if (region->depth == 4) + map_table = map2to4; + else + map_table = NULL; + + x_pos = dvbsub_read_2bit_string(pbuf + (y_pos * region->width), + region->width, &buf, buf_end - buf, + non_mod, map_table, x_pos); + break; + case 0x11: + if (region->depth < 4) { + av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth); + return; + } + + if (region->depth == 8) + map_table = map4to8; + else + map_table = NULL; + + x_pos = dvbsub_read_4bit_string(pbuf + (y_pos * region->width), + region->width, &buf, buf_end - buf, + non_mod, map_table, x_pos); + break; + case 0x12: + if (region->depth < 8) { + av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth); + return; + } + + x_pos = dvbsub_read_8bit_string(pbuf + (y_pos * region->width), + region->width, &buf, buf_end - buf, + non_mod, NULL, x_pos); + break; + + case 0x20: + map2to4[0] = (*buf) >> 4; + map2to4[1] = (*buf++) & 0xf; + map2to4[2] = (*buf) >> 4; + map2to4[3] = (*buf++) & 0xf; + break; + case 0x21: + for (i = 0; i < 4; i++) + map2to8[i] = *buf++; + break; + case 0x22: + for (i = 0; i < 16; i++) + map4to8[i] = *buf++; + break; + + case 0xf0: + x_pos = display->x_pos; + y_pos += 2; + break; + default: + av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1)); + } + } + +} + +static void dvbsub_parse_object_segment(AVCodecContext *avctx, + const uint8_t *buf, int buf_size) +{ + DVBSubContext *ctx = avctx->priv_data; + + const uint8_t *buf_end = buf + buf_size; + int object_id; + DVBSubObject *object; + DVBSubObjectDisplay *display; + int top_field_len, bottom_field_len; + + int coding_method, non_modifying_color; + + object_id = AV_RB16(buf); + buf += 2; + + object = get_object(ctx, object_id); + + if (!object) + return; + + coding_method = ((*buf) >> 2) & 3; + non_modifying_color = ((*buf++) >> 1) & 1; + + if (coding_method == 0) { + top_field_len = AV_RB16(buf); + buf += 2; + bottom_field_len = AV_RB16(buf); + buf += 2; + + if (buf + top_field_len + bottom_field_len > buf_end) { + av_log(avctx, AV_LOG_ERROR, "Field data size too large\n"); + return; + } + + for (display = object->display_list; display; display = display->object_list_next) { + const uint8_t *block = buf; + int bfl = bottom_field_len; + + dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0, + non_modifying_color); + + if (bottom_field_len > 0) + block = buf + top_field_len; + else + bfl = top_field_len; + + dvbsub_parse_pixel_data_block(avctx, display, block, bfl, 1, + non_modifying_color); + } + +/* } else if (coding_method == 1) {*/ + + } else { + av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method); + } + +} + +static void dvbsub_parse_clut_segment(AVCodecContext *avctx, + const uint8_t *buf, int buf_size) +{ + DVBSubContext *ctx = avctx->priv_data; + + const uint8_t *buf_end = buf + buf_size; + int i, clut_id; + int version; + DVBSubCLUT *clut; + int entry_id, depth , full_range; + int y, cr, cb, alpha; + int r, g, b, r_add, g_add, b_add; + + av_dlog(avctx, "DVB clut packet:\n"); + + for (i=0; i < buf_size; i++) { + av_dlog(avctx, "%02x ", buf[i]); + if (i % 16 == 15) + av_dlog(avctx, "\n"); + } + + if (i % 16) + av_dlog(avctx, "\n"); + + clut_id = *buf++; + version = ((*buf)>>4)&15; + buf += 1; + + clut = get_clut(ctx, clut_id); + + if (!clut) { + clut = av_malloc(sizeof(DVBSubCLUT)); + + memcpy(clut, &default_clut, sizeof(DVBSubCLUT)); + + clut->id = clut_id; + clut->version = -1; + + clut->next = ctx->clut_list; + ctx->clut_list = clut; + } + + if (clut->version != version) { + + clut->version = version; + + while (buf + 4 < buf_end) { + entry_id = *buf++; + + depth = (*buf) & 0xe0; + + if (depth == 0) { + av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf); + return; + } + + full_range = (*buf++) & 1; + + if (full_range) { + y = *buf++; + cr = *buf++; + cb = *buf++; + alpha = *buf++; + } else { + y = buf[0] & 0xfc; + cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4; + cb = (buf[1] << 2) & 0xf0; + alpha = (buf[1] << 6) & 0xc0; + + buf += 2; + } + + if (y == 0) + alpha = 0xff; + + YUV_TO_RGB1_CCIR(cb, cr); + YUV_TO_RGB2_CCIR(r, g, b, y); + + av_dlog(avctx, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha); + + if (depth & 0x80) + clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha); + if (depth & 0x40) + clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha); + if (depth & 0x20) + clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha); + } + } +} + + +static void dvbsub_parse_region_segment(AVCodecContext *avctx, + const uint8_t *buf, int buf_size) +{ + DVBSubContext *ctx = avctx->priv_data; + + const uint8_t *buf_end = buf + buf_size; + int region_id, object_id; + int av_unused version; + DVBSubRegion *region; + DVBSubObject *object; + DVBSubObjectDisplay *display; + int fill; + + if (buf_size < 10) + return; + + region_id = *buf++; + + region = get_region(ctx, region_id); + + if (!region) { + region = av_mallocz(sizeof(DVBSubRegion)); + + region->id = region_id; + region->version = -1; + + region->next = ctx->region_list; + ctx->region_list = region; + } + + version = ((*buf)>>4) & 15; + fill = ((*buf++) >> 3) & 1; + + region->width = AV_RB16(buf); + buf += 2; + region->height = AV_RB16(buf); + buf += 2; + + if (region->width * region->height != region->buf_size) { + av_free(region->pbuf); + + region->buf_size = region->width * region->height; + + region->pbuf = av_malloc(region->buf_size); + + fill = 1; + region->dirty = 0; + } + + region->depth = 1 << (((*buf++) >> 2) & 7); + if(region->depth<2 || region->depth>8){ + av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth); + region->depth= 4; + } + region->clut = *buf++; + + if (region->depth == 8) { + region->bgcolor = *buf++; + buf += 1; + } else { + buf += 1; + + if (region->depth == 4) + region->bgcolor = (((*buf++) >> 4) & 15); + else + region->bgcolor = (((*buf++) >> 2) & 3); + } + + av_dlog(avctx, "Region %d, (%dx%d)\n", region_id, region->width, region->height); + + if (fill) { + memset(region->pbuf, region->bgcolor, region->buf_size); + av_dlog(avctx, "Fill region (%d)\n", region->bgcolor); + } + + delete_region_display_list(ctx, region); + + while (buf + 5 < buf_end) { + object_id = AV_RB16(buf); + buf += 2; + + object = get_object(ctx, object_id); + + if (!object) { + object = av_mallocz(sizeof(DVBSubObject)); + + object->id = object_id; + object->next = ctx->object_list; + ctx->object_list = object; + } + + object->type = (*buf) >> 6; + + display = av_mallocz(sizeof(DVBSubObjectDisplay)); + + display->object_id = object_id; + display->region_id = region_id; + + display->x_pos = AV_RB16(buf) & 0xfff; + buf += 2; + display->y_pos = AV_RB16(buf) & 0xfff; + buf += 2; + + if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) { + display->fgcolor = *buf++; + display->bgcolor = *buf++; + } + + display->region_list_next = region->display_list; + region->display_list = display; + + display->object_list_next = object->display_list; + object->display_list = display; + } +} + +static void dvbsub_parse_page_segment(AVCodecContext *avctx, + const uint8_t *buf, int buf_size) +{ + DVBSubContext *ctx = avctx->priv_data; + DVBSubRegionDisplay *display; + DVBSubRegionDisplay *tmp_display_list, **tmp_ptr; + + const uint8_t *buf_end = buf + buf_size; + int region_id; + int page_state; + int timeout; + int version; + + if (buf_size < 1) + return; + + timeout = *buf++; + version = ((*buf)>>4) & 15; + page_state = ((*buf++) >> 2) & 3; + + if (ctx->version != version) { + + ctx->time_out = timeout; + ctx->version = version; + + av_dlog(avctx, "Page time out %ds, state %d\n", ctx->time_out, page_state); + + if (page_state == 1 || page_state == 2) { + delete_regions(ctx); + delete_objects(ctx); + delete_cluts(ctx); + } + + tmp_display_list = ctx->display_list; + ctx->display_list = NULL; + ctx->display_list_size = 0; + + while (buf + 5 < buf_end) { + region_id = *buf++; + buf += 1; + + display = tmp_display_list; + tmp_ptr = &tmp_display_list; + + while (display && display->region_id != region_id) { + tmp_ptr = &display->next; + display = display->next; + } + + if (!display) + display = av_mallocz(sizeof(DVBSubRegionDisplay)); + + display->region_id = region_id; + + display->x_pos = AV_RB16(buf); + buf += 2; + display->y_pos = AV_RB16(buf); + buf += 2; + + *tmp_ptr = display->next; + + display->next = ctx->display_list; + ctx->display_list = display; + ctx->display_list_size++; + + av_dlog(avctx, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos); + } + + while (tmp_display_list) { + display = tmp_display_list; + + tmp_display_list = display->next; + + av_free(display); + } + } + +} + + +#ifdef DEBUG +static void save_display_set(DVBSubContext *ctx) +{ + DVBSubRegion *region; + DVBSubRegionDisplay *display; + DVBSubCLUT *clut; + uint32_t *clut_table; + int x_pos, y_pos, width, height; + int x, y, y_off, x_off; + uint32_t *pbuf; + char filename[32]; + static int fileno_index = 0; + + x_pos = -1; + y_pos = -1; + width = 0; + height = 0; + + for (display = ctx->display_list; display; display = display->next) { + region = get_region(ctx, display->region_id); + + if (x_pos == -1) { + x_pos = display->x_pos; + y_pos = display->y_pos; + width = region->width; + height = region->height; + } else { + if (display->x_pos < x_pos) { + width += (x_pos - display->x_pos); + x_pos = display->x_pos; + } + + if (display->y_pos < y_pos) { + height += (y_pos - display->y_pos); + y_pos = display->y_pos; + } + + if (display->x_pos + region->width > x_pos + width) { + width = display->x_pos + region->width - x_pos; + } + + if (display->y_pos + region->height > y_pos + height) { + height = display->y_pos + region->height - y_pos; + } + } + } + + if (x_pos >= 0) { + + pbuf = av_malloc(width * height * 4); + + for (display = ctx->display_list; display; display = display->next) { + region = get_region(ctx, display->region_id); + + x_off = display->x_pos - x_pos; + y_off = display->y_pos - y_pos; + + clut = get_clut(ctx, region->clut); + + if (clut == 0) + clut = &default_clut; + + switch (region->depth) { + case 2: + clut_table = clut->clut4; + break; + case 8: + clut_table = clut->clut256; + break; + case 4: + default: + clut_table = clut->clut16; + break; + } + + for (y = 0; y < region->height; y++) { + for (x = 0; x < region->width; x++) { + pbuf[((y + y_off) * width) + x_off + x] = + clut_table[region->pbuf[y * region->width + x]]; + } + } + + } + + snprintf(filename, sizeof(filename), "dvbs.%d", fileno_index); + + png_save2(filename, pbuf, width, height); + + av_free(pbuf); + } + + fileno_index++; +} +#endif + +static void dvbsub_parse_display_definition_segment(AVCodecContext *avctx, + const uint8_t *buf, + int buf_size) +{ + DVBSubContext *ctx = avctx->priv_data; + DVBSubDisplayDefinition *display_def = ctx->display_definition; + int dds_version, info_byte; + + if (buf_size < 5) + return; + + info_byte = bytestream_get_byte(&buf); + dds_version = info_byte >> 4; + if (display_def && display_def->version == dds_version) + return; // already have this display definition version + + if (!display_def) { + display_def = av_mallocz(sizeof(*display_def)); + ctx->display_definition = display_def; + } + if (!display_def) + return; + + display_def->version = dds_version; + display_def->x = 0; + display_def->y = 0; + display_def->width = bytestream_get_be16(&buf) + 1; + display_def->height = bytestream_get_be16(&buf) + 1; + if (!avctx->width || !avctx->height) { + avctx->width = display_def->width; + avctx->height = display_def->height; + } + + if (buf_size < 13) + return; + + if (info_byte & 1<<3) { // display_window_flag + display_def->x = bytestream_get_be16(&buf); + display_def->y = bytestream_get_be16(&buf); + display_def->width = bytestream_get_be16(&buf) - display_def->x + 1; + display_def->height = bytestream_get_be16(&buf) - display_def->y + 1; + } +} + +static int dvbsub_display_end_segment(AVCodecContext *avctx, const uint8_t *buf, + int buf_size, AVSubtitle *sub) +{ + DVBSubContext *ctx = avctx->priv_data; + DVBSubDisplayDefinition *display_def = ctx->display_definition; + + DVBSubRegion *region; + DVBSubRegionDisplay *display; + AVSubtitleRect *rect; + DVBSubCLUT *clut; + uint32_t *clut_table; + int i; + int offset_x=0, offset_y=0; + + sub->end_display_time = ctx->time_out * 1000; + + if (display_def) { + offset_x = display_def->x; + offset_y = display_def->y; + } + + sub->num_rects = ctx->display_list_size; + + if (sub->num_rects > 0){ + sub->rects = av_mallocz(sizeof(*sub->rects) * sub->num_rects); + for(i=0; inum_rects; i++) + sub->rects[i] = av_mallocz(sizeof(*sub->rects[i])); + + i = 0; + + for (display = ctx->display_list; display; display = display->next) { + region = get_region(ctx, display->region_id); + + if (!region) + continue; + + if (!region->dirty) + continue; + + rect = sub->rects[i]; + rect->x = display->x_pos + offset_x; + rect->y = display->y_pos + offset_y; + rect->w = region->width; + rect->h = region->height; + rect->nb_colors = (1 << region->depth); + rect->type = SUBTITLE_BITMAP; + rect->pict.linesize[0] = region->width; + + clut = get_clut(ctx, region->clut); + + if (!clut) + clut = &default_clut; + + switch (region->depth) { + case 2: + clut_table = clut->clut4; + break; + case 8: + clut_table = clut->clut256; + break; + case 4: + default: + clut_table = clut->clut16; + break; + } + + rect->pict.data[1] = av_mallocz(AVPALETTE_SIZE); + memcpy(rect->pict.data[1], clut_table, (1 << region->depth) * sizeof(uint32_t)); + + rect->pict.data[0] = av_malloc(region->buf_size); + memcpy(rect->pict.data[0], region->pbuf, region->buf_size); + + i++; + } + + sub->num_rects = i; + } +#ifdef DEBUG + save_display_set(ctx); +#endif + + return 1; +} + +static int dvbsub_decode(AVCodecContext *avctx, + void *data, int *data_size, + AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + DVBSubContext *ctx = avctx->priv_data; + AVSubtitle *sub = data; + const uint8_t *p, *p_end; + int segment_type; + int page_id; + int segment_length; + int i; + int got_segment = 0; + + av_dlog(avctx, "DVB sub packet:\n"); + + for (i=0; i < buf_size; i++) { + av_dlog(avctx, "%02x ", buf[i]); + if (i % 16 == 15) + av_dlog(avctx, "\n"); + } + + if (i % 16) + av_dlog(avctx, "\n"); + + if (buf_size <= 6 || *buf != 0x0f) { + av_dlog(avctx, "incomplete or broken packet"); + return -1; + } + + p = buf; + p_end = buf + buf_size; + + while (p_end - p >= 6 && *p == 0x0f) { + p += 1; + segment_type = *p++; + page_id = AV_RB16(p); + p += 2; + segment_length = AV_RB16(p); + p += 2; + + if (p_end - p < segment_length) { + av_dlog(avctx, "incomplete or broken packet"); + return -1; + } + + if (page_id == ctx->composition_id || page_id == ctx->ancillary_id || + ctx->composition_id == -1 || ctx->ancillary_id == -1) { + switch (segment_type) { + case DVBSUB_PAGE_SEGMENT: + dvbsub_parse_page_segment(avctx, p, segment_length); + got_segment |= 1; + break; + case DVBSUB_REGION_SEGMENT: + dvbsub_parse_region_segment(avctx, p, segment_length); + got_segment |= 2; + break; + case DVBSUB_CLUT_SEGMENT: + dvbsub_parse_clut_segment(avctx, p, segment_length); + got_segment |= 4; + break; + case DVBSUB_OBJECT_SEGMENT: + dvbsub_parse_object_segment(avctx, p, segment_length); + got_segment |= 8; + break; + case DVBSUB_DISPLAYDEFINITION_SEGMENT: + dvbsub_parse_display_definition_segment(avctx, p, segment_length); + break; + case DVBSUB_DISPLAY_SEGMENT: + *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub); + got_segment |= 16; + break; + default: + av_dlog(avctx, "Subtitling segment type 0x%x, page id %d, length %d\n", + segment_type, page_id, segment_length); + break; + } + } + + p += segment_length; + } + // Some streams do not send a display segment but if we have all the other + // segments then we need no further data. + if (got_segment == 15 && sub) + *data_size = dvbsub_display_end_segment(avctx, p, 0, sub); + + return p - buf; +} + + +AVCodec ff_dvbsub_decoder = { + .name = "dvbsub", + .type = AVMEDIA_TYPE_SUBTITLE, + .id = AV_CODEC_ID_DVB_SUBTITLE, + .priv_data_size = sizeof(DVBSubContext), + .init = dvbsub_init_decoder, + .close = dvbsub_close_decoder, + .decode = dvbsub_decode, + .long_name = NULL_IF_CONFIG_SMALL("DVB subtitles"), +}; -- cgit v1.2.3