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path: root/ffmpeg1/libavcodec/dvdsubdec.c
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Diffstat (limited to 'ffmpeg1/libavcodec/dvdsubdec.c')
-rw-r--r--ffmpeg1/libavcodec/dvdsubdec.c611
1 files changed, 0 insertions, 611 deletions
diff --git a/ffmpeg1/libavcodec/dvdsubdec.c b/ffmpeg1/libavcodec/dvdsubdec.c
deleted file mode 100644
index cb268b8..0000000
--- a/ffmpeg1/libavcodec/dvdsubdec.c
+++ /dev/null
@@ -1,611 +0,0 @@
-/*
- * DVD subtitle decoding
- * Copyright (c) 2005 Fabrice Bellard
- *
- * 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 "get_bits.h"
-#include "dsputil.h"
-#include "libavutil/colorspace.h"
-#include "libavutil/opt.h"
-#include "libavutil/imgutils.h"
-#include "libavutil/avstring.h"
-
-//#define DEBUG
-
-typedef struct DVDSubContext
-{
- AVClass *class;
- uint32_t palette[16];
- char *palette_str;
- int has_palette;
- uint8_t colormap[4];
- uint8_t alpha[256];
-} DVDSubContext;
-
-static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
-{
- uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
- uint8_t r, g, b;
- int i, y, cb, cr;
- int r_add, g_add, b_add;
-
- for (i = num_values; i > 0; i--) {
- y = *ycbcr++;
- cr = *ycbcr++;
- cb = *ycbcr++;
- YUV_TO_RGB1_CCIR(cb, cr);
- YUV_TO_RGB2_CCIR(r, g, b, y);
- *rgba++ = (*alpha++ << 24) | (r << 16) | (g << 8) | b;
- }
-}
-
-static int decode_run_2bit(GetBitContext *gb, int *color)
-{
- unsigned int v, t;
-
- v = 0;
- for (t = 1; v < t && t <= 0x40; t <<= 2)
- v = (v << 4) | get_bits(gb, 4);
- *color = v & 3;
- if (v < 4) { /* Code for fill rest of line */
- return INT_MAX;
- }
- return v >> 2;
-}
-
-static int decode_run_8bit(GetBitContext *gb, int *color)
-{
- int len;
- int has_run = get_bits1(gb);
- if (get_bits1(gb))
- *color = get_bits(gb, 8);
- else
- *color = get_bits(gb, 2);
- if (has_run) {
- if (get_bits1(gb)) {
- len = get_bits(gb, 7);
- if (len == 0)
- len = INT_MAX;
- else
- len += 9;
- } else
- len = get_bits(gb, 3) + 2;
- } else
- len = 1;
- return len;
-}
-
-static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
- const uint8_t *buf, int start, int buf_size, int is_8bit)
-{
- GetBitContext gb;
- int bit_len;
- int x, y, len, color;
- uint8_t *d;
-
- bit_len = (buf_size - start) * 8;
- init_get_bits(&gb, buf + start, bit_len);
-
- x = 0;
- y = 0;
- d = bitmap;
- for(;;) {
- if (get_bits_count(&gb) > bit_len)
- return -1;
- if (is_8bit)
- len = decode_run_8bit(&gb, &color);
- else
- len = decode_run_2bit(&gb, &color);
- len = FFMIN(len, w - x);
- memset(d + x, color, len);
- x += len;
- if (x >= w) {
- y++;
- if (y >= h)
- break;
- d += linesize;
- x = 0;
- /* byte align */
- align_get_bits(&gb);
- }
- }
- return 0;
-}
-
-static void guess_palette(DVDSubContext* ctx,
- uint32_t *rgba_palette,
- uint32_t subtitle_color)
-{
- static const uint8_t level_map[4][4] = {
- // this configuration (full range, lowest to highest) in tests
- // seemed most common, so assume this
- {0xff},
- {0x00, 0xff},
- {0x00, 0x80, 0xff},
- {0x00, 0x55, 0xaa, 0xff},
- };
- uint8_t color_used[16] = { 0 };
- int nb_opaque_colors, i, level, j, r, g, b;
- uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
-
- if(ctx->has_palette) {
- for(i = 0; i < 4; i++)
- rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff)
- | ((alpha[i] * 17U) << 24);
- return;
- }
-
- for(i = 0; i < 4; i++)
- rgba_palette[i] = 0;
-
- nb_opaque_colors = 0;
- for(i = 0; i < 4; i++) {
- if (alpha[i] != 0 && !color_used[colormap[i]]) {
- color_used[colormap[i]] = 1;
- nb_opaque_colors++;
- }
- }
-
- if (nb_opaque_colors == 0)
- return;
-
- j = 0;
- memset(color_used, 0, 16);
- for(i = 0; i < 4; i++) {
- if (alpha[i] != 0) {
- if (!color_used[colormap[i]]) {
- level = level_map[nb_opaque_colors][j];
- r = (((subtitle_color >> 16) & 0xff) * level) >> 8;
- g = (((subtitle_color >> 8) & 0xff) * level) >> 8;
- b = (((subtitle_color >> 0) & 0xff) * level) >> 8;
- rgba_palette[i] = b | (g << 8) | (r << 16) | ((alpha[i] * 17) << 24);
- color_used[colormap[i]] = (i + 1);
- j++;
- } else {
- rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) |
- ((alpha[i] * 17) << 24);
- }
- }
- }
-}
-
-#define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
-
-static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header,
- const uint8_t *buf, int buf_size)
-{
- int cmd_pos, pos, cmd, x1, y1, x2, y2, offset1, offset2, next_cmd_pos;
- int big_offsets, offset_size, is_8bit = 0;
- const uint8_t *yuv_palette = 0;
- uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha;
- int date;
- int i;
- int is_menu = 0;
-
- if (buf_size < 10)
- return -1;
-
- if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */
- big_offsets = 1;
- offset_size = 4;
- cmd_pos = 6;
- } else {
- big_offsets = 0;
- offset_size = 2;
- cmd_pos = 2;
- }
-
- cmd_pos = READ_OFFSET(buf + cmd_pos);
-
- while (cmd_pos > 0 && cmd_pos < buf_size - 2 - offset_size) {
- date = AV_RB16(buf + cmd_pos);
- next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);
- av_dlog(NULL, "cmd_pos=0x%04x next=0x%04x date=%d\n",
- cmd_pos, next_cmd_pos, date);
- pos = cmd_pos + 2 + offset_size;
- offset1 = -1;
- offset2 = -1;
- x1 = y1 = x2 = y2 = 0;
- while (pos < buf_size) {
- cmd = buf[pos++];
- av_dlog(NULL, "cmd=%02x\n", cmd);
- switch(cmd) {
- case 0x00:
- /* menu subpicture */
- is_menu = 1;
- break;
- case 0x01:
- /* set start date */
- sub_header->start_display_time = (date << 10) / 90;
- break;
- case 0x02:
- /* set end date */
- sub_header->end_display_time = (date << 10) / 90;
- break;
- case 0x03:
- /* set colormap */
- if ((buf_size - pos) < 2)
- goto fail;
- colormap[3] = buf[pos] >> 4;
- colormap[2] = buf[pos] & 0x0f;
- colormap[1] = buf[pos + 1] >> 4;
- colormap[0] = buf[pos + 1] & 0x0f;
- pos += 2;
- break;
- case 0x04:
- /* set alpha */
- if ((buf_size - pos) < 2)
- goto fail;
- alpha[3] = buf[pos] >> 4;
- alpha[2] = buf[pos] & 0x0f;
- alpha[1] = buf[pos + 1] >> 4;
- alpha[0] = buf[pos + 1] & 0x0f;
- pos += 2;
- av_dlog(NULL, "alpha=%x%x%x%x\n", alpha[0],alpha[1],alpha[2],alpha[3]);
- break;
- case 0x05:
- case 0x85:
- if ((buf_size - pos) < 6)
- goto fail;
- x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);
- x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];
- y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);
- y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];
- if (cmd & 0x80)
- is_8bit = 1;
- av_dlog(NULL, "x1=%d x2=%d y1=%d y2=%d\n", x1, x2, y1, y2);
- pos += 6;
- break;
- case 0x06:
- if ((buf_size - pos) < 4)
- goto fail;
- offset1 = AV_RB16(buf + pos);
- offset2 = AV_RB16(buf + pos + 2);
- av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);
- pos += 4;
- break;
- case 0x86:
- if ((buf_size - pos) < 8)
- goto fail;
- offset1 = AV_RB32(buf + pos);
- offset2 = AV_RB32(buf + pos + 4);
- av_dlog(NULL, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);
- pos += 8;
- break;
-
- case 0x83:
- /* HD set palette */
- if ((buf_size - pos) < 768)
- goto fail;
- yuv_palette = buf + pos;
- pos += 768;
- break;
- case 0x84:
- /* HD set contrast (alpha) */
- if ((buf_size - pos) < 256)
- goto fail;
- for (i = 0; i < 256; i++)
- alpha[i] = 0xFF - buf[pos+i];
- pos += 256;
- break;
-
- case 0xff:
- goto the_end;
- default:
- av_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd);
- goto the_end;
- }
- }
- the_end:
- if (offset1 >= 0) {
- int w, h;
- uint8_t *bitmap;
-
- /* decode the bitmap */
- w = x2 - x1 + 1;
- if (w < 0)
- w = 0;
- h = y2 - y1;
- if (h < 0)
- h = 0;
- if (w > 0 && h > 0) {
- if (sub_header->rects != NULL) {
- for (i = 0; i < sub_header->num_rects; i++) {
- av_freep(&sub_header->rects[i]->pict.data[0]);
- av_freep(&sub_header->rects[i]->pict.data[1]);
- av_freep(&sub_header->rects[i]);
- }
- av_freep(&sub_header->rects);
- sub_header->num_rects = 0;
- }
-
- bitmap = av_malloc(w * h);
- sub_header->rects = av_mallocz(sizeof(*sub_header->rects));
- sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect));
- sub_header->num_rects = 1;
- sub_header->rects[0]->pict.data[0] = bitmap;
- decode_rle(bitmap, w * 2, w, (h + 1) / 2,
- buf, offset1, buf_size, is_8bit);
- decode_rle(bitmap + w, w * 2, w, h / 2,
- buf, offset2, buf_size, is_8bit);
- sub_header->rects[0]->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
- if (is_8bit) {
- if (yuv_palette == 0)
- goto fail;
- sub_header->rects[0]->nb_colors = 256;
- yuv_a_to_rgba(yuv_palette, alpha, (uint32_t*)sub_header->rects[0]->pict.data[1], 256);
- } else {
- sub_header->rects[0]->nb_colors = 4;
- guess_palette(ctx, (uint32_t*)sub_header->rects[0]->pict.data[1],
- 0xffff00);
- }
- sub_header->rects[0]->x = x1;
- sub_header->rects[0]->y = y1;
- sub_header->rects[0]->w = w;
- sub_header->rects[0]->h = h;
- sub_header->rects[0]->type = SUBTITLE_BITMAP;
- sub_header->rects[0]->pict.linesize[0] = w;
- sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0;
- }
- }
- if (next_cmd_pos < cmd_pos) {
- av_log(NULL, AV_LOG_ERROR, "Invalid command offset\n");
- break;
- }
- if (next_cmd_pos == cmd_pos)
- break;
- cmd_pos = next_cmd_pos;
- }
- if (sub_header->num_rects > 0)
- return is_menu;
- fail:
- if (sub_header->rects != NULL) {
- for (i = 0; i < sub_header->num_rects; i++) {
- av_freep(&sub_header->rects[i]->pict.data[0]);
- av_freep(&sub_header->rects[i]->pict.data[1]);
- av_freep(&sub_header->rects[i]);
- }
- av_freep(&sub_header->rects);
- sub_header->num_rects = 0;
- }
- return -1;
-}
-
-static int is_transp(const uint8_t *buf, int pitch, int n,
- const uint8_t *transp_color)
-{
- int i;
- for(i = 0; i < n; i++) {
- if (!transp_color[*buf])
- return 0;
- buf += pitch;
- }
- return 1;
-}
-
-/* return 0 if empty rectangle, 1 if non empty */
-static int find_smallest_bounding_rectangle(AVSubtitle *s)
-{
- uint8_t transp_color[256] = { 0 };
- int y1, y2, x1, x2, y, w, h, i;
- uint8_t *bitmap;
-
- if (s->num_rects == 0 || s->rects == NULL || s->rects[0]->w <= 0 || s->rects[0]->h <= 0)
- return 0;
-
- for(i = 0; i < s->rects[0]->nb_colors; i++) {
- if ((((uint32_t*)s->rects[0]->pict.data[1])[i] >> 24) == 0)
- transp_color[i] = 1;
- }
- y1 = 0;
- while (y1 < s->rects[0]->h && is_transp(s->rects[0]->pict.data[0] + y1 * s->rects[0]->pict.linesize[0],
- 1, s->rects[0]->w, transp_color))
- y1++;
- if (y1 == s->rects[0]->h) {
- av_freep(&s->rects[0]->pict.data[0]);
- s->rects[0]->w = s->rects[0]->h = 0;
- return 0;
- }
-
- y2 = s->rects[0]->h - 1;
- while (y2 > 0 && is_transp(s->rects[0]->pict.data[0] + y2 * s->rects[0]->pict.linesize[0], 1,
- s->rects[0]->w, transp_color))
- y2--;
- x1 = 0;
- while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->pict.data[0] + x1, s->rects[0]->pict.linesize[0],
- s->rects[0]->h, transp_color))
- x1++;
- x2 = s->rects[0]->w - 1;
- while (x2 > 0 && is_transp(s->rects[0]->pict.data[0] + x2, s->rects[0]->pict.linesize[0], s->rects[0]->h,
- transp_color))
- x2--;
- w = x2 - x1 + 1;
- h = y2 - y1 + 1;
- bitmap = av_malloc(w * h);
- if (!bitmap)
- return 1;
- for(y = 0; y < h; y++) {
- memcpy(bitmap + w * y, s->rects[0]->pict.data[0] + x1 + (y1 + y) * s->rects[0]->pict.linesize[0], w);
- }
- av_freep(&s->rects[0]->pict.data[0]);
- s->rects[0]->pict.data[0] = bitmap;
- s->rects[0]->pict.linesize[0] = w;
- s->rects[0]->w = w;
- s->rects[0]->h = h;
- s->rects[0]->x += x1;
- s->rects[0]->y += y1;
- return 1;
-}
-
-#ifdef DEBUG
-#undef fprintf
-#undef perror
-#undef exit
-static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
- uint32_t *rgba_palette)
-{
- int x, y, v;
- FILE *f;
-
- f = fopen(filename, "w");
- if (!f) {
- perror(filename);
- exit(1);
- }
- 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);
-}
-#endif
-
-static int dvdsub_decode(AVCodecContext *avctx,
- void *data, int *data_size,
- AVPacket *avpkt)
-{
- DVDSubContext *ctx = avctx->priv_data;
- const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
- AVSubtitle *sub = data;
- int is_menu;
-
- is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size);
-
- if (is_menu < 0) {
- no_subtitle:
- *data_size = 0;
-
- return buf_size;
- }
- if (!is_menu && find_smallest_bounding_rectangle(sub) == 0)
- goto no_subtitle;
-
-#if defined(DEBUG)
- av_dlog(NULL, "start=%d ms end =%d ms\n",
- sub->start_display_time,
- sub->end_display_time);
- ppm_save("/tmp/a.ppm", sub->rects[0]->pict.data[0],
- sub->rects[0]->w, sub->rects[0]->h, sub->rects[0]->pict.data[1]);
-#endif
-
- *data_size = 1;
- return buf_size;
-}
-
-static void parse_palette(DVDSubContext *ctx, char *p)
-{
- int i;
-
- ctx->has_palette = 1;
- for(i=0;i<16;i++) {
- ctx->palette[i] = strtoul(p, &p, 16);
- while(*p == ',' || av_isspace(*p))
- p++;
- }
-}
-
-static int dvdsub_parse_extradata(AVCodecContext *avctx)
-{
- DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data;
- char *dataorig, *data;
-
- if (!avctx->extradata || !avctx->extradata_size)
- return 1;
-
- dataorig = data = av_malloc(avctx->extradata_size+1);
- if (!data)
- return AVERROR(ENOMEM);
- memcpy(data, avctx->extradata, avctx->extradata_size);
- data[avctx->extradata_size] = '\0';
-
- for(;;) {
- int pos = strcspn(data, "\n\r");
- if (pos==0 && *data==0)
- break;
-
- if (strncmp("palette:", data, 8) == 0) {
- parse_palette(ctx, data + 8);
- } else if (strncmp("size:", data, 5) == 0) {
- int w, h;
- if (sscanf(data + 5, "%dx%d", &w, &h) == 2 &&
- av_image_check_size(w, h, 0, avctx) >= 0)
- avcodec_set_dimensions(avctx, w, h);
- }
-
- data += pos;
- data += strspn(data, "\n\r");
- }
-
- av_free(dataorig);
- return 1;
-}
-
-static int dvdsub_init(AVCodecContext *avctx)
-{
- DVDSubContext *ctx = avctx->priv_data;
- int ret;
-
- if ((ret = dvdsub_parse_extradata(avctx)) < 0)
- return ret;
-
- if (ctx->palette_str)
- parse_palette(ctx, ctx->palette_str);
- if (ctx->has_palette) {
- int i;
- av_log(avctx, AV_LOG_DEBUG, "palette:");
- for(i=0;i<16;i++)
- av_log(avctx, AV_LOG_DEBUG, " 0x%06x", ctx->palette[i]);
- av_log(avctx, AV_LOG_DEBUG, "\n");
- }
-
- return 1;
-}
-
-#define OFFSET(field) offsetof(DVDSubContext, field)
-#define VD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
-static const AVOption options[] = {
- { "palette", "set the global palette", OFFSET(palette_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, VD },
- { NULL }
-};
-static const AVClass class = {
- .class_name = "dvdsubdec",
- .item_name = av_default_item_name,
- .option = options,
- .version = LIBAVUTIL_VERSION_INT,
-};
-
-AVCodec ff_dvdsub_decoder = {
- .name = "dvdsub",
- .type = AVMEDIA_TYPE_SUBTITLE,
- .id = AV_CODEC_ID_DVD_SUBTITLE,
- .priv_data_size = sizeof(DVDSubContext),
- .init = dvdsub_init,
- .decode = dvdsub_decode,
- .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"),
- .priv_class = &class,
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 21:55:34 +0000