diff options
Diffstat (limited to 'ffmpeg/libavcodec/pgssubdec.c')
| -rw-r--r-- | ffmpeg/libavcodec/pgssubdec.c | 557 |
1 files changed, 0 insertions, 557 deletions
diff --git a/ffmpeg/libavcodec/pgssubdec.c b/ffmpeg/libavcodec/pgssubdec.c deleted file mode 100644 index f45f0bf..0000000 --- a/ffmpeg/libavcodec/pgssubdec.c +++ /dev/null @@ -1,557 +0,0 @@ -/* - * PGS subtitle decoder - * Copyright (c) 2009 Stephen Backway - * - * 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 - */ - -/** - * @file - * PGS subtitle decoder - */ - -#include "avcodec.h" -#include "dsputil.h" -#include "bytestream.h" -#include "internal.h" - -#include "libavutil/colorspace.h" -#include "libavutil/imgutils.h" -#include "libavutil/opt.h" - -#define RGBA(r,g,b,a) (((a) << 24) | ((r) << 16) | ((g) << 8) | (b)) - -enum SegmentType { - PALETTE_SEGMENT = 0x14, - PICTURE_SEGMENT = 0x15, - PRESENTATION_SEGMENT = 0x16, - WINDOW_SEGMENT = 0x17, - DISPLAY_SEGMENT = 0x80, -}; - -typedef struct PGSSubPictureReference { - int x; - int y; - int picture_id; - int composition; -} PGSSubPictureReference; - -typedef struct PGSSubPresentation { - int id_number; - int object_count; - PGSSubPictureReference *objects; - int64_t pts; -} PGSSubPresentation; - -typedef struct PGSSubPicture { - int w; - int h; - uint8_t *rle; - unsigned int rle_buffer_size, rle_data_len; - unsigned int rle_remaining_len; -} PGSSubPicture; - -typedef struct PGSSubContext { - AVClass *class; - PGSSubPresentation presentation; - uint32_t clut[256]; - PGSSubPicture pictures[UINT16_MAX]; - int forced_subs_only; -} PGSSubContext; - -static av_cold int init_decoder(AVCodecContext *avctx) -{ - avctx->pix_fmt = AV_PIX_FMT_PAL8; - - return 0; -} - -static av_cold int close_decoder(AVCodecContext *avctx) -{ - uint16_t picture; - - PGSSubContext *ctx = avctx->priv_data; - - av_freep(&ctx->presentation.objects); - ctx->presentation.object_count = 0; - - for (picture = 0; picture < UINT16_MAX; ++picture) { - av_freep(&ctx->pictures[picture].rle); - ctx->pictures[picture].rle_buffer_size = 0; - } - - return 0; -} - -/** - * Decode the RLE data. - * - * The subtitle is stored as a Run Length Encoded image. - * - * @param avctx contains the current codec context - * @param sub pointer to the processed subtitle data - * @param buf pointer to the RLE data to process - * @param buf_size size of the RLE data to process - */ -static int decode_rle(AVCodecContext *avctx, AVSubtitle *sub, int rect, - const uint8_t *buf, unsigned int buf_size) -{ - const uint8_t *rle_bitmap_end; - int pixel_count, line_count; - - rle_bitmap_end = buf + buf_size; - - sub->rects[rect]->pict.data[0] = av_malloc(sub->rects[rect]->w * sub->rects[rect]->h); - - if (!sub->rects[rect]->pict.data[0]) - return -1; - - pixel_count = 0; - line_count = 0; - - while (buf < rle_bitmap_end && line_count < sub->rects[rect]->h) { - uint8_t flags, color; - int run; - - color = bytestream_get_byte(&buf); - run = 1; - - if (color == 0x00) { - flags = bytestream_get_byte(&buf); - run = flags & 0x3f; - if (flags & 0x40) - run = (run << 8) + bytestream_get_byte(&buf); - color = flags & 0x80 ? bytestream_get_byte(&buf) : 0; - } - - if (run > 0 && pixel_count + run <= sub->rects[rect]->w * sub->rects[rect]->h) { - memset(sub->rects[rect]->pict.data[0] + pixel_count, color, run); - pixel_count += run; - } else if (!run) { - /* - * New Line. Check if correct pixels decoded, if not display warning - * and adjust bitmap pointer to correct new line position. - */ - if (pixel_count % sub->rects[rect]->w > 0) - av_log(avctx, AV_LOG_ERROR, "Decoded %d pixels, when line should be %d pixels\n", - pixel_count % sub->rects[rect]->w, sub->rects[rect]->w); - line_count++; - } - } - - if (pixel_count < sub->rects[rect]->w * sub->rects[rect]->h) { - av_log(avctx, AV_LOG_ERROR, "Insufficient RLE data for subtitle\n"); - return -1; - } - - av_dlog(avctx, "Pixel Count = %d, Area = %d\n", pixel_count, sub->rects[rect]->w * sub->rects[rect]->h); - - return 0; -} - -/** - * Parse the picture segment packet. - * - * The picture segment contains details on the sequence id, - * width, height and Run Length Encoded (RLE) bitmap data. - * - * @param avctx contains the current codec context - * @param buf pointer to the packet to process - * @param buf_size size of packet to process - * @todo TODO: Enable support for RLE data over multiple packets - */ -static int parse_picture_segment(AVCodecContext *avctx, - const uint8_t *buf, int buf_size) -{ - PGSSubContext *ctx = avctx->priv_data; - - uint8_t sequence_desc; - unsigned int rle_bitmap_len, width, height; - uint16_t picture_id; - - if (buf_size <= 4) - return -1; - buf_size -= 4; - - picture_id = bytestream_get_be16(&buf); - - /* skip 1 unknown byte: Version Number */ - buf++; - - /* Read the Sequence Description to determine if start of RLE data or appended to previous RLE */ - sequence_desc = bytestream_get_byte(&buf); - - if (!(sequence_desc & 0x80)) { - /* Additional RLE data */ - if (buf_size > ctx->pictures[picture_id].rle_remaining_len) - return -1; - - memcpy(ctx->pictures[picture_id].rle + ctx->pictures[picture_id].rle_data_len, buf, buf_size); - ctx->pictures[picture_id].rle_data_len += buf_size; - ctx->pictures[picture_id].rle_remaining_len -= buf_size; - - return 0; - } - - if (buf_size <= 7) - return -1; - buf_size -= 7; - - /* Decode rle bitmap length, stored size includes width/height data */ - rle_bitmap_len = bytestream_get_be24(&buf) - 2*2; - - /* Get bitmap dimensions from data */ - width = bytestream_get_be16(&buf); - height = bytestream_get_be16(&buf); - - /* Make sure the bitmap is not too large */ - if (avctx->width < width || avctx->height < height) { - av_log(avctx, AV_LOG_ERROR, "Bitmap dimensions larger than video.\n"); - return -1; - } - - if (buf_size > rle_bitmap_len) { - av_log(avctx, AV_LOG_ERROR, "too much RLE data\n"); - return AVERROR_INVALIDDATA; - } - - ctx->pictures[picture_id].w = width; - ctx->pictures[picture_id].h = height; - - av_fast_malloc(&ctx->pictures[picture_id].rle, &ctx->pictures[picture_id].rle_buffer_size, rle_bitmap_len); - - if (!ctx->pictures[picture_id].rle) - return -1; - - memcpy(ctx->pictures[picture_id].rle, buf, buf_size); - ctx->pictures[picture_id].rle_data_len = buf_size; - ctx->pictures[picture_id].rle_remaining_len = rle_bitmap_len - buf_size; - - return 0; -} - -/** - * Parse the palette segment packet. - * - * The palette segment contains details of the palette, - * a maximum of 256 colors can be defined. - * - * @param avctx contains the current codec context - * @param buf pointer to the packet to process - * @param buf_size size of packet to process - */ -static void parse_palette_segment(AVCodecContext *avctx, - const uint8_t *buf, int buf_size) -{ - PGSSubContext *ctx = avctx->priv_data; - - const uint8_t *buf_end = buf + buf_size; - const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP; - int color_id; - int y, cb, cr, alpha; - int r, g, b, r_add, g_add, b_add; - - /* Skip two null bytes */ - buf += 2; - - while (buf < buf_end) { - color_id = bytestream_get_byte(&buf); - y = bytestream_get_byte(&buf); - cr = bytestream_get_byte(&buf); - cb = bytestream_get_byte(&buf); - alpha = bytestream_get_byte(&buf); - - YUV_TO_RGB1(cb, cr); - YUV_TO_RGB2(r, g, b, y); - - av_dlog(avctx, "Color %d := (%d,%d,%d,%d)\n", color_id, r, g, b, alpha); - - /* Store color in palette */ - ctx->clut[color_id] = RGBA(r,g,b,alpha); - } -} - -/** - * Parse the presentation segment packet. - * - * The presentation segment contains details on the video - * width, video height, x & y subtitle position. - * - * @param avctx contains the current codec context - * @param buf pointer to the packet to process - * @param buf_size size of packet to process - * @todo TODO: Implement cropping - */ -static int parse_presentation_segment(AVCodecContext *avctx, - const uint8_t *buf, int buf_size, - int64_t pts) -{ - PGSSubContext *ctx = avctx->priv_data; - int ret; - - int w = bytestream_get_be16(&buf); - int h = bytestream_get_be16(&buf); - - uint16_t object_index; - - ctx->presentation.pts = pts; - - av_dlog(avctx, "Video Dimensions %dx%d\n", - w, h); - ret = ff_set_dimensions(avctx, w, h); - if (ret < 0) - return ret; - - /* Skip 1 bytes of unknown, frame rate? */ - buf++; - - ctx->presentation.id_number = bytestream_get_be16(&buf); - - /* - * Skip 3 bytes of unknown: - * state - * palette_update_flag (0x80), - * palette_id_to_use, - */ - buf += 3; - - ctx->presentation.object_count = bytestream_get_byte(&buf); - if (!ctx->presentation.object_count) - return 0; - - /* Verify that enough bytes are remaining for all of the objects. */ - buf_size -= 11; - if (buf_size < ctx->presentation.object_count * 8) { - ctx->presentation.object_count = 0; - return AVERROR_INVALIDDATA; - } - - av_freep(&ctx->presentation.objects); - ctx->presentation.objects = av_malloc(sizeof(PGSSubPictureReference) * ctx->presentation.object_count); - if (!ctx->presentation.objects) { - ctx->presentation.object_count = 0; - return AVERROR(ENOMEM); - } - - for (object_index = 0; object_index < ctx->presentation.object_count; ++object_index) { - PGSSubPictureReference *reference = &ctx->presentation.objects[object_index]; - reference->picture_id = bytestream_get_be16(&buf); - - /* Skip window_id_ref */ - buf++; - /* composition_flag (0x80 - object cropped, 0x40 - object forced) */ - reference->composition = bytestream_get_byte(&buf); - - reference->x = bytestream_get_be16(&buf); - reference->y = bytestream_get_be16(&buf); - - /* TODO If cropping, cropping_x, cropping_y, cropping_width, cropping_height (all 2 bytes).*/ - av_dlog(avctx, "Subtitle Placement ID=%d, x=%d, y=%d\n", reference->picture_id, reference->x, reference->y); - - if (reference->x > avctx->width || reference->y > avctx->height) { - av_log(avctx, AV_LOG_ERROR, "Subtitle out of video bounds. x = %d, y = %d, video width = %d, video height = %d.\n", - reference->x, reference->y, avctx->width, avctx->height); - reference->x = 0; - reference->y = 0; - } - } - - return 0; -} - -/** - * Parse the display segment packet. - * - * The display segment controls the updating of the display. - * - * @param avctx contains the current codec context - * @param data pointer to the data pertaining the subtitle to display - * @param buf pointer to the packet to process - * @param buf_size size of packet to process - * @todo TODO: Fix start time, relies on correct PTS, currently too late - * - * @todo TODO: Fix end time, normally cleared by a second display - * @todo segment, which is currently ignored as it clears - * @todo the subtitle too early. - */ -static int display_end_segment(AVCodecContext *avctx, void *data, - const uint8_t *buf, int buf_size) -{ - AVSubtitle *sub = data; - PGSSubContext *ctx = avctx->priv_data; - int64_t pts; - - uint16_t rect; - - /* - * The end display time is a timeout value and is only reached - * if the next subtitle is later than timeout or subtitle has - * not been cleared by a subsequent empty display command. - */ - - pts = ctx->presentation.pts != AV_NOPTS_VALUE ? ctx->presentation.pts : sub->pts; - memset(sub, 0, sizeof(*sub)); - sub->pts = pts; - ctx->presentation.pts = AV_NOPTS_VALUE; - - // Blank if last object_count was 0. - if (!ctx->presentation.object_count) - return 1; - - sub->start_display_time = 0; - sub->end_display_time = 20000; - sub->format = 0; - - sub->num_rects = ctx->presentation.object_count; - sub->rects = av_mallocz(sizeof(*sub->rects) * sub->num_rects); - - for (rect = 0; rect < sub->num_rects; ++rect) { - uint16_t picture_id = ctx->presentation.objects[rect].picture_id; - sub->rects[rect] = av_mallocz(sizeof(*sub->rects[rect])); - sub->rects[rect]->x = ctx->presentation.objects[rect].x; - sub->rects[rect]->y = ctx->presentation.objects[rect].y; - sub->rects[rect]->w = ctx->pictures[picture_id].w; - sub->rects[rect]->h = ctx->pictures[picture_id].h; - sub->rects[rect]->type = SUBTITLE_BITMAP; - - /* Process bitmap */ - sub->rects[rect]->pict.linesize[0] = ctx->pictures[picture_id].w; - if (ctx->pictures[picture_id].rle) { - if (ctx->pictures[picture_id].rle_remaining_len) - av_log(avctx, AV_LOG_ERROR, "RLE data length %u is %u bytes shorter than expected\n", - ctx->pictures[picture_id].rle_data_len, ctx->pictures[picture_id].rle_remaining_len); - if (decode_rle(avctx, sub, rect, ctx->pictures[picture_id].rle, ctx->pictures[picture_id].rle_data_len) < 0) - return 0; - } - - /* Allocate memory for colors */ - sub->rects[rect]->nb_colors = 256; - sub->rects[rect]->pict.data[1] = av_mallocz(AVPALETTE_SIZE); - - /* Copy the forced flag */ - sub->rects[rect]->flags = (ctx->presentation.objects[rect].composition & 0x40) != 0 ? AV_SUBTITLE_FLAG_FORCED : 0; - - if (!ctx->forced_subs_only || ctx->presentation.objects[rect].composition & 0x40) - memcpy(sub->rects[rect]->pict.data[1], ctx->clut, sub->rects[rect]->nb_colors * sizeof(uint32_t)); - } - - return 1; -} - -static int decode(AVCodecContext *avctx, void *data, int *data_size, - AVPacket *avpkt) -{ - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - AVSubtitle *sub = data; - - const uint8_t *buf_end; - uint8_t segment_type; - int segment_length; - int i, ret; - - av_dlog(avctx, "PGS 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 & 15) - av_dlog(avctx, "\n"); - - *data_size = 0; - - /* Ensure that we have received at a least a segment code and segment length */ - if (buf_size < 3) - return -1; - - buf_end = buf + buf_size; - - /* Step through buffer to identify segments */ - while (buf < buf_end) { - segment_type = bytestream_get_byte(&buf); - segment_length = bytestream_get_be16(&buf); - - av_dlog(avctx, "Segment Length %d, Segment Type %x\n", segment_length, segment_type); - - if (segment_type != DISPLAY_SEGMENT && segment_length > buf_end - buf) - break; - - switch (segment_type) { - case PALETTE_SEGMENT: - parse_palette_segment(avctx, buf, segment_length); - break; - case PICTURE_SEGMENT: - parse_picture_segment(avctx, buf, segment_length); - break; - case PRESENTATION_SEGMENT: - ret = parse_presentation_segment(avctx, buf, segment_length, sub->pts); - if (ret < 0) - return ret; - break; - case WINDOW_SEGMENT: - /* - * Window Segment Structure (No new information provided): - * 2 bytes: Unknown, - * 2 bytes: X position of subtitle, - * 2 bytes: Y position of subtitle, - * 2 bytes: Width of subtitle, - * 2 bytes: Height of subtitle. - */ - break; - case DISPLAY_SEGMENT: - *data_size = display_end_segment(avctx, data, buf, segment_length); - break; - default: - av_log(avctx, AV_LOG_ERROR, "Unknown subtitle segment type 0x%x, length %d\n", - segment_type, segment_length); - break; - } - - buf += segment_length; - } - - return buf_size; -} - -#define OFFSET(x) offsetof(PGSSubContext, x) -#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM -static const AVOption options[] = { - {"forced_subs_only", "Only show forced subtitles", OFFSET(forced_subs_only), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, SD}, - { NULL }, -}; - -static const AVClass pgsdec_class = { - .class_name = "PGS subtitle decoder", - .item_name = av_default_item_name, - .option = options, - .version = LIBAVUTIL_VERSION_INT, -}; - -AVCodec ff_pgssub_decoder = { - .name = "pgssub", - .long_name = NULL_IF_CONFIG_SMALL("HDMV Presentation Graphic Stream subtitles"), - .type = AVMEDIA_TYPE_SUBTITLE, - .id = AV_CODEC_ID_HDMV_PGS_SUBTITLE, - .priv_data_size = sizeof(PGSSubContext), - .init = init_decoder, - .close = close_decoder, - .decode = decode, - .priv_class = &pgsdec_class, -}; |