| /* |
| * 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 "internal.h" |
| |
| #include "libavutil/attributes.h" |
| #include "libavutil/colorspace.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/imgutils.h" |
| #include "libavutil/bswap.h" |
| |
| typedef struct DVDSubContext |
| { |
| AVClass *class; |
| uint32_t palette[16]; |
| char *palette_str; |
| char *ifo_str; |
| int has_palette; |
| uint8_t colormap[4]; |
| uint8_t alpha[256]; |
| uint8_t buf[0x10000]; |
| int buf_size; |
| int forced_subs_only; |
| uint8_t used_color[256]; |
| #ifdef DEBUG |
| int sub_id; |
| #endif |
| } DVDSubContext; |
| |
| static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values) |
| { |
| const uint8_t *cm = ff_crop_tab + 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++ = ((unsigned)*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); |
| *color = get_bits(gb, 2 + 6*get_bits1(gb)); |
| 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, uint8_t used_color[256], |
| 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; |
| |
| if (start >= buf_size) |
| return -1; |
| |
| if (w <= 0 || h <= 0) |
| return -1; |
| |
| 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); |
| if (len != INT_MAX && len > w - x) |
| return AVERROR_INVALIDDATA; |
| len = FFMIN(len, w - x); |
| memset(d + x, color, len); |
| used_color[color] = 1; |
| 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 - 1][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] * 17U) << 24); |
| color_used[colormap[i]] = (i + 1); |
| j++; |
| } else { |
| rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) | |
| ((alpha[i] * 17U) << 24); |
| } |
| } |
| } |
| } |
| |
| static void reset_rects(AVSubtitle *sub_header) |
| { |
| int i; |
| |
| if (sub_header->rects) { |
| for (i = 0; i < sub_header->num_rects; i++) { |
| av_freep(&sub_header->rects[i]->data[0]); |
| av_freep(&sub_header->rects[i]->data[1]); |
| av_freep(&sub_header->rects[i]); |
| } |
| av_freep(&sub_header->rects); |
| sub_header->num_rects = 0; |
| } |
| } |
| |
| #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, next_cmd_pos; |
| int big_offsets, offset_size, is_8bit = 0; |
| const uint8_t *yuv_palette = NULL; |
| uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha; |
| int date; |
| int i; |
| int is_menu = 0; |
| uint32_t size; |
| int64_t offset1, offset2; |
| |
| 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; |
| } |
| |
| size = READ_OFFSET(buf + (big_offsets ? 2 : 0)); |
| cmd_pos = READ_OFFSET(buf + cmd_pos); |
| |
| if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size) { |
| if (cmd_pos > size) { |
| av_log(ctx, AV_LOG_ERROR, "Discarding invalid packet\n"); |
| return 0; |
| } |
| return AVERROR(EAGAIN); |
| } |
| |
| 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); |
| ff_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++]; |
| ff_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; |
| ff_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; |
| ff_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); |
| ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\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); |
| ff_dlog(NULL, "offset1=0x%04"PRIx64" offset2=0x%04"PRIx64"\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: |
| ff_dlog(NULL, "unrecognised subpicture command 0x%x\n", cmd); |
| goto the_end; |
| } |
| } |
| the_end: |
| if (offset1 >= buf_size || offset2 >= buf_size) |
| goto fail; |
| |
| if (offset1 >= 0 && offset2 >= 0) { |
| int w, h; |
| uint8_t *bitmap; |
| |
| /* decode the bitmap */ |
| w = x2 - x1 + 1; |
| if (w < 0) |
| w = 0; |
| h = y2 - y1 + 1; |
| if (h < 0) |
| h = 0; |
| if (w > 0 && h > 1) { |
| reset_rects(sub_header); |
| memset(ctx->used_color, 0, sizeof(ctx->used_color)); |
| sub_header->rects = av_mallocz(sizeof(*sub_header->rects)); |
| if (!sub_header->rects) |
| goto fail; |
| sub_header->rects[0] = av_mallocz(sizeof(AVSubtitleRect)); |
| if (!sub_header->rects[0]) |
| goto fail; |
| sub_header->num_rects = 1; |
| bitmap = sub_header->rects[0]->data[0] = av_malloc(w * h); |
| if (!bitmap) |
| goto fail; |
| if (decode_rle(bitmap, w * 2, w, (h + 1) / 2, ctx->used_color, |
| buf, offset1, buf_size, is_8bit) < 0) |
| goto fail; |
| if (decode_rle(bitmap + w, w * 2, w, h / 2, ctx->used_color, |
| buf, offset2, buf_size, is_8bit) < 0) |
| goto fail; |
| sub_header->rects[0]->data[1] = av_mallocz(AVPALETTE_SIZE); |
| if (!sub_header->rects[0]->data[1]) |
| goto fail; |
| if (is_8bit) { |
| if (!yuv_palette) |
| goto fail; |
| sub_header->rects[0]->nb_colors = 256; |
| yuv_a_to_rgba(yuv_palette, alpha, |
| (uint32_t *)sub_header->rects[0]->data[1], |
| 256); |
| } else { |
| sub_header->rects[0]->nb_colors = 4; |
| guess_palette(ctx, (uint32_t*)sub_header->rects[0]->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]->linesize[0] = w; |
| sub_header->rects[0]->flags = is_menu ? AV_SUBTITLE_FLAG_FORCED : 0; |
| |
| #if FF_API_AVPICTURE |
| FF_DISABLE_DEPRECATION_WARNINGS |
| for (i = 0; i < 4; i++) { |
| sub_header->rects[0]->pict.data[i] = sub_header->rects[0]->data[i]; |
| sub_header->rects[0]->pict.linesize[i] = sub_header->rects[0]->linesize[i]; |
| } |
| FF_ENABLE_DEPRECATION_WARNINGS |
| #endif |
| } |
| } |
| if (next_cmd_pos < cmd_pos) { |
| av_log(ctx, 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: |
| reset_rects(sub_header); |
| 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(DVDSubContext *ctx, AVSubtitle *s) |
| { |
| uint8_t transp_color[256] = { 0 }; |
| int y1, y2, x1, x2, y, w, h, i; |
| uint8_t *bitmap; |
| int transparent = 1; |
| |
| if (s->num_rects == 0 || !s->rects || 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]->data[1])[i] >> 24) == 0) { |
| transp_color[i] = 1; |
| } else if (ctx->used_color[i]) |
| transparent = 0; |
| } |
| if (transparent) |
| return 0; |
| y1 = 0; |
| while (y1 < s->rects[0]->h && is_transp(s->rects[0]->data[0] + y1 * s->rects[0]->linesize[0], |
| 1, s->rects[0]->w, transp_color)) |
| y1++; |
| if (y1 == s->rects[0]->h) { |
| av_freep(&s->rects[0]->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]->data[0] + y2 * s->rects[0]->linesize[0], 1, |
| s->rects[0]->w, transp_color)) |
| y2--; |
| x1 = 0; |
| while (x1 < (s->rects[0]->w - 1) && is_transp(s->rects[0]->data[0] + x1, s->rects[0]->linesize[0], |
| s->rects[0]->h, transp_color)) |
| x1++; |
| x2 = s->rects[0]->w - 1; |
| while (x2 > 0 && is_transp(s->rects[0]->data[0] + x2, s->rects[0]->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]->data[0] + x1 + (y1 + y) * s->rects[0]->linesize[0], w); |
| } |
| av_freep(&s->rects[0]->data[0]); |
| s->rects[0]->data[0] = bitmap; |
| s->rects[0]->linesize[0] = w; |
| s->rects[0]->w = w; |
| s->rects[0]->h = h; |
| s->rects[0]->x += x1; |
| s->rects[0]->y += y1; |
| |
| #if FF_API_AVPICTURE |
| FF_DISABLE_DEPRECATION_WARNINGS |
| for (i = 0; i < 4; i++) { |
| s->rects[0]->pict.data[i] = s->rects[0]->data[i]; |
| s->rects[0]->pict.linesize[i] = s->rects[0]->linesize[i]; |
| } |
| FF_ENABLE_DEPRECATION_WARNINGS |
| #endif |
| |
| return 1; |
| } |
| |
| #ifdef DEBUG |
| #define ALPHA_MIX(A,BACK,FORE) (((255-(A)) * (BACK) + (A) * (FORE)) / 255) |
| static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h, |
| uint32_t *rgba_palette) |
| { |
| int x, y, alpha; |
| uint32_t v; |
| int back[3] = {0, 255, 0}; /* green background */ |
| FILE *f; |
| |
| f = fopen(filename, "w"); |
| if (!f) { |
| perror(filename); |
| 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]]; |
| alpha = v >> 24; |
| putc(ALPHA_MIX(alpha, back[0], (v >> 16) & 0xff), f); |
| putc(ALPHA_MIX(alpha, back[1], (v >> 8) & 0xff), f); |
| putc(ALPHA_MIX(alpha, back[2], (v >> 0) & 0xff), f); |
| } |
| } |
| fclose(f); |
| } |
| #endif |
| |
| static int append_to_cached_buf(AVCodecContext *avctx, |
| const uint8_t *buf, int buf_size) |
| { |
| DVDSubContext *ctx = avctx->priv_data; |
| |
| av_assert0(buf_size >= 0 && ctx->buf_size <= sizeof(ctx->buf)); |
| if (buf_size >= sizeof(ctx->buf) - ctx->buf_size) { |
| av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct " |
| "too large SPU packets aborted.\n"); |
| ctx->buf_size = 0; |
| return AVERROR_INVALIDDATA; |
| } |
| memcpy(ctx->buf + ctx->buf_size, buf, buf_size); |
| ctx->buf_size += buf_size; |
| return 0; |
| } |
| |
| 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 appended = 0; |
| int is_menu; |
| |
| if (ctx->buf_size) { |
| int ret = append_to_cached_buf(avctx, buf, buf_size); |
| if (ret < 0) { |
| *data_size = 0; |
| return ret; |
| } |
| buf = ctx->buf; |
| buf_size = ctx->buf_size; |
| appended = 1; |
| } |
| |
| is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size); |
| if (is_menu == AVERROR(EAGAIN)) { |
| *data_size = 0; |
| return appended ? 0 : append_to_cached_buf(avctx, buf, buf_size); |
| } |
| |
| if (is_menu < 0) { |
| ctx->buf_size = 0; |
| no_subtitle: |
| reset_rects(sub); |
| *data_size = 0; |
| |
| return buf_size; |
| } |
| if (!is_menu && find_smallest_bounding_rectangle(ctx, sub) == 0) |
| goto no_subtitle; |
| |
| if (ctx->forced_subs_only && !(sub->rects[0]->flags & AV_SUBTITLE_FLAG_FORCED)) |
| goto no_subtitle; |
| |
| #if defined(DEBUG) |
| { |
| char ppm_name[32]; |
| |
| snprintf(ppm_name, sizeof(ppm_name), "/tmp/%05d.ppm", ctx->sub_id++); |
| ff_dlog(NULL, "start=%d ms end =%d ms\n", |
| sub->start_display_time, |
| sub->end_display_time); |
| ppm_save(ppm_name, sub->rects[0]->data[0], |
| sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->data[1]); |
| } |
| #endif |
| |
| ctx->buf_size = 0; |
| *data_size = 1; |
| return buf_size; |
| } |
| |
| static int parse_ifo_palette(DVDSubContext *ctx, char *p) |
| { |
| FILE *ifo; |
| char ifostr[12]; |
| uint32_t sp_pgci, pgci, off_pgc, pgc; |
| uint8_t r, g, b, yuv[65], *buf; |
| int i, y, cb, cr, r_add, g_add, b_add; |
| int ret = 0; |
| const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP; |
| |
| ctx->has_palette = 0; |
| if ((ifo = fopen(p, "r")) == NULL) { |
| av_log(ctx, AV_LOG_WARNING, "Unable to open IFO file \"%s\": %s\n", p, av_err2str(AVERROR(errno))); |
| return AVERROR_EOF; |
| } |
| if (fread(ifostr, 12, 1, ifo) != 1 || memcmp(ifostr, "DVDVIDEO-VTS", 12)) { |
| av_log(ctx, AV_LOG_WARNING, "\"%s\" is not a proper IFO file\n", p); |
| ret = AVERROR_INVALIDDATA; |
| goto end; |
| } |
| if (fseek(ifo, 0xCC, SEEK_SET) == -1) { |
| ret = AVERROR(errno); |
| goto end; |
| } |
| if (fread(&sp_pgci, 4, 1, ifo) == 1) { |
| pgci = av_be2ne32(sp_pgci) * 2048; |
| if (fseek(ifo, pgci + 0x0C, SEEK_SET) == -1) { |
| ret = AVERROR(errno); |
| goto end; |
| } |
| if (fread(&off_pgc, 4, 1, ifo) == 1) { |
| pgc = pgci + av_be2ne32(off_pgc); |
| if (fseek(ifo, pgc + 0xA4, SEEK_SET) == -1) { |
| ret = AVERROR(errno); |
| goto end; |
| } |
| if (fread(yuv, 64, 1, ifo) == 1) { |
| buf = yuv; |
| for(i=0; i<16; i++) { |
| y = *++buf; |
| cr = *++buf; |
| cb = *++buf; |
| YUV_TO_RGB1_CCIR(cb, cr); |
| YUV_TO_RGB2_CCIR(r, g, b, y); |
| ctx->palette[i] = (r << 16) + (g << 8) + b; |
| buf++; |
| } |
| ctx->has_palette = 1; |
| } |
| } |
| } |
| if (ctx->has_palette == 0) { |
| av_log(ctx, AV_LOG_WARNING, "Failed to read palette from IFO file \"%s\"\n", p); |
| ret = AVERROR_INVALIDDATA; |
| } |
| end: |
| fclose(ifo); |
| return ret; |
| } |
| |
| static int dvdsub_parse_extradata(AVCodecContext *avctx) |
| { |
| DVDSubContext *ctx = (DVDSubContext*) avctx->priv_data; |
| char *dataorig, *data; |
| int ret = 1; |
| |
| 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) { |
| ctx->has_palette = 1; |
| ff_dvdsub_parse_palette(ctx->palette, data + 8); |
| } else if (strncmp("size:", data, 5) == 0) { |
| int w, h; |
| if (sscanf(data + 5, "%dx%d", &w, &h) == 2) { |
| ret = ff_set_dimensions(avctx, w, h); |
| if (ret < 0) |
| goto fail; |
| } |
| } |
| |
| data += pos; |
| data += strspn(data, "\n\r"); |
| } |
| |
| fail: |
| av_free(dataorig); |
| return ret; |
| } |
| |
| static av_cold int dvdsub_init(AVCodecContext *avctx) |
| { |
| DVDSubContext *ctx = avctx->priv_data; |
| int ret; |
| |
| if ((ret = dvdsub_parse_extradata(avctx)) < 0) |
| return ret; |
| |
| if (ctx->ifo_str) |
| parse_ifo_palette(ctx, ctx->ifo_str); |
| if (ctx->palette_str) { |
| ctx->has_palette = 1; |
| ff_dvdsub_parse_palette(ctx->palette, 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%06"PRIx32, ctx->palette[i]); |
| av_log(avctx, AV_LOG_DEBUG, "\n"); |
| } |
| |
| return 1; |
| } |
| |
| static void dvdsub_flush(AVCodecContext *avctx) |
| { |
| DVDSubContext *ctx = avctx->priv_data; |
| ctx->buf_size = 0; |
| } |
| |
| static av_cold int dvdsub_close(AVCodecContext *avctx) |
| { |
| dvdsub_flush(avctx); |
| return 0; |
| } |
| |
| #define OFFSET(field) offsetof(DVDSubContext, field) |
| #define SD 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, SD }, |
| { "ifo_palette", "obtain the global palette from .IFO file", OFFSET(ifo_str), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, SD }, |
| { "forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, SD}, |
| { NULL } |
| }; |
| static const AVClass dvdsub_class = { |
| .class_name = "dvdsubdec", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| AVCodec ff_dvdsub_decoder = { |
| .name = "dvdsub", |
| .long_name = NULL_IF_CONFIG_SMALL("DVD subtitles"), |
| .type = AVMEDIA_TYPE_SUBTITLE, |
| .id = AV_CODEC_ID_DVD_SUBTITLE, |
| .priv_data_size = sizeof(DVDSubContext), |
| .init = dvdsub_init, |
| .decode = dvdsub_decode, |
| .flush = dvdsub_flush, |
| .close = dvdsub_close, |
| .priv_class = &dvdsub_class, |
| }; |
