| /* | |
| * 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 "codec_internal.h" | |
| #include "decode.h" | |
| #include "dvdsub.h" | |
| #include "get_bits.h" | |
| #include "libavutil/attributes.h" | |
| #include "libavutil/colorspace.h" | |
| #include "libavutil/file_open.h" | |
| #include "libavutil/opt.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]; | |
| } 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], | |
| 0xffffff); | |
| } | |
| 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 (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; | |
| return 1; | |
| } | |
| 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, AVSubtitle *sub, | |
| int *data_size, const AVPacket *avpkt) | |
| { | |
| DVDSubContext *ctx = avctx->priv_data; | |
| const uint8_t *buf = avpkt->data; | |
| int buf_size = avpkt->size; | |
| 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; | |
| 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 = avpriv_fopen_utf8(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; | |
| } | |
| #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, | |
| }; | |
| const FFCodec ff_dvdsub_decoder = { | |
| .p.name = "dvdsub", | |
| CODEC_LONG_NAME("DVD subtitles"), | |
| .p.type = AVMEDIA_TYPE_SUBTITLE, | |
| .p.id = AV_CODEC_ID_DVD_SUBTITLE, | |
| .priv_data_size = sizeof(DVDSubContext), | |
| .init = dvdsub_init, | |
| FF_CODEC_DECODE_SUB_CB(dvdsub_decode), | |
| .flush = dvdsub_flush, | |
| .p.priv_class = &dvdsub_class, | |
| }; |