diff options
Diffstat (limited to 'libavcodec/dvdsubdec.c')
| -rw-r--r-- | libavcodec/dvdsubdec.c | 341 |
1 files changed, 267 insertions, 74 deletions
diff --git a/libavcodec/dvdsubdec.c b/libavcodec/dvdsubdec.c index bc5a3a7..ffb2bcc 100644 --- a/libavcodec/dvdsubdec.c +++ b/libavcodec/dvdsubdec.c @@ -2,20 +2,20 @@ * DVD subtitle decoding * Copyright (c) 2005 Fabrice Bellard * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ @@ -25,12 +25,26 @@ #include "libavutil/attributes.h" #include "libavutil/colorspace.h" +#include "libavutil/opt.h" #include "libavutil/imgutils.h" #include "libavutil/avstring.h" +#include "libavutil/bswap.h" -typedef struct DVDSubContext { - uint32_t palette[16]; - int has_palette; +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; +#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) @@ -94,6 +108,12 @@ static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, 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); @@ -125,17 +145,24 @@ static int decode_rle(uint8_t *bitmap, int linesize, int w, int h, static void guess_palette(DVDSubContext* ctx, uint32_t *rgba_palette, - uint8_t *colormap, - uint8_t *alpha, 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++) + if(ctx->has_palette) { + for(i = 0; i < 4; i++) rgba_palette[i] = (ctx->palette[colormap[i]] & 0x00ffffff) - | ((alpha[i] * 17) << 24); + | ((alpha[i] * 17U) << 24); return; } @@ -153,18 +180,18 @@ static void guess_palette(DVDSubContext* ctx, if (nb_opaque_colors == 0) return; - j = nb_opaque_colors; + j = 0; memset(color_used, 0, 16); for(i = 0; i < 4; i++) { if (alpha[i] != 0) { if (!color_used[colormap[i]]) { - level = (0xff * j) / nb_opaque_colors; + 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--; + j++; } else { rgba_palette[i] = (rgba_palette[color_used[colormap[i]] - 1] & 0x00ffffff) | ((alpha[i] * 17) << 24); @@ -173,6 +200,21 @@ static void guess_palette(DVDSubContext* ctx, } } +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]->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; + } +} + #define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a)) static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, @@ -180,15 +222,14 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, { 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[4] = { 0 }, alpha[256] = { 0 }; + const uint8_t *yuv_palette = NULL; + uint8_t *colormap = ctx->colormap, *alpha = ctx->alpha; int date; int i; int is_menu = 0; if (buf_size < 10) return -1; - memset(sub_header, 0, sizeof(*sub_header)); if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */ big_offsets = 1; @@ -202,6 +243,9 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, cmd_pos = READ_OFFSET(buf + cmd_pos); + if (cmd_pos < 0 || cmd_pos > buf_size - 2 - offset_size) + 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); @@ -310,19 +354,11 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, w = x2 - x1 + 1; if (w < 0) w = 0; - h = y2 - y1; + h = y2 - y1 + 1; if (h < 0) h = 0; if (w > 0 && h > 0) { - if (sub_header->rects) { - 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; - } + reset_rects(sub_header); sub_header->rects = av_mallocz(sizeof(*sub_header->rects)); if (!sub_header->rects) @@ -334,23 +370,24 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, bitmap = sub_header->rects[0]->pict.data[0] = av_malloc(w * h); if (!bitmap) goto fail; - 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); + if (decode_rle(bitmap, w * 2, w, (h + 1) / 2, + buf, offset1, buf_size, is_8bit) < 0) + goto fail; + if (decode_rle(bitmap + w, w * 2, w, h / 2, + buf, offset2, buf_size, is_8bit) < 0) + goto fail; sub_header->rects[0]->pict.data[1] = av_mallocz(AVPALETTE_SIZE); if (!sub_header->rects[0]->pict.data[1]) goto fail; if (is_8bit) { - if (yuv_palette == 0) + 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]->pict.data[1], 256); } else { sub_header->rects[0]->nb_colors = 4; - guess_palette(ctx, - (uint32_t*)sub_header->rects[0]->pict.data[1], - colormap, alpha, 0xffff00); + 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; @@ -358,8 +395,13 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, 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; @@ -367,15 +409,7 @@ static int decode_dvd_subtitles(DVDSubContext *ctx, AVSubtitle *sub_header, if (sub_header->num_rects > 0) return is_menu; fail: - if (!sub_header->rects) { - 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; - } + reset_rects(sub_header); return -1; } @@ -446,16 +480,19 @@ static int find_smallest_bounding_rectangle(AVSubtitle *s) } #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, v; + 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); - exit(1); + return; } fprintf(f, "P6\n" "%d %d\n" @@ -464,15 +501,31 @@ static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h, 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); + 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; + + if (ctx->buf_size >= sizeof(ctx->buf) - buf_size) { + av_log(avctx, AV_LOG_WARNING, "Attempt to reconstruct " + "too large SPU packets aborted.\n"); + 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) @@ -483,10 +536,25 @@ static int dvdsub_decode(AVCodecContext *avctx, AVSubtitle *sub = data; 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; + } + is_menu = decode_dvd_subtitles(ctx, sub, buf, buf_size); + if (is_menu == AVERROR(EAGAIN)) { + *data_size = 0; + return append_to_cached_buf(avctx, buf, buf_size); + } if (is_menu < 0) { no_subtitle: + reset_rects(sub); *data_size = 0; return buf_size; @@ -494,61 +562,184 @@ static int dvdsub_decode(AVCodecContext *avctx, if (!is_menu && find_smallest_bounding_rectangle(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++); 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]); + ppm_save(ppm_name, sub->rects[0]->pict.data[0], + sub->rects[0]->w, sub->rects[0]->h, (uint32_t*) sub->rects[0]->pict.data[1]); + } #endif + ctx->buf_size = 0; *data_size = 1; return buf_size; } -static av_cold int dvdsub_init(AVCodecContext *avctx) +static void parse_palette(DVDSubContext *ctx, char *p) { - DVDSubContext *ctx = avctx->priv_data; - char *data, *cur; + 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 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 0; + return 1; - data = av_malloc(avctx->extradata_size + 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'; - cur = data; - - while (*cur) { - if (strncmp("palette:", cur, 8) == 0) { - int i; - char *p = cur + 8; - ctx->has_palette = 1; - for (i = 0; i < 16; i++) { - ctx->palette[i] = strtoul(p, &p, 16); - while (*p == ',' || av_isspace(*p)) - p++; - } - } else if (!strncmp("size:", cur, 5)) { + + 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(cur + 5, "%dx%d", &w, &h) == 2) { + if (sscanf(data + 5, "%dx%d", &w, &h) == 2) { ret = ff_set_dimensions(avctx, w, h); if (ret < 0) goto fail; } } - cur += strcspn(cur, "\n\r"); - cur += strspn(cur, "\n\r"); + + data += pos; + data += strspn(data, "\n\r"); } fail: - av_free(data); + 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) + 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; +} + +static av_cold int dvdsub_close(AVCodecContext *avctx) +{ + DVDSubContext *ctx = avctx->priv_data; + ctx->buf_size = 0; + 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_INT, {.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"), @@ -557,4 +748,6 @@ AVCodec ff_dvdsub_decoder = { .priv_data_size = sizeof(DVDSubContext), .init = dvdsub_init, .decode = dvdsub_decode, + .close = dvdsub_close, + .priv_class = &dvdsub_class, }; 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