dvbsubdec.c File Reference

#include "avcodec.h"
#include "dsputil.h"
#include "bitstream.h"
#include "colorspace.h"

Go to the source code of this file.

Data Structures
struct	DVBSubCLUT
struct	DVBSubObjectDisplay
struct	DVBSubObject
struct	DVBSubRegionDisplay
struct	DVBSubRegion
struct	DVBSubContext
Defines
#define	DVBSUB_PAGE_SEGMENT   0x10
#define	DVBSUB_REGION_SEGMENT   0x11
#define	DVBSUB_CLUT_SEGMENT   0x12
#define	DVBSUB_OBJECT_SEGMENT   0x13
#define	DVBSUB_DISPLAY_SEGMENT   0x80
#define	cm   (ff_cropTbl + MAX_NEG_CROP)
#define	RGBA(r, g, b, a)   (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))
Functions
static DVBSubObject *	get_object (DVBSubContext *ctx, int object_id)
static DVBSubCLUT *	get_clut (DVBSubContext *ctx, int clut_id)
static DVBSubRegion *	get_region (DVBSubContext *ctx, int region_id)
static void	delete_region_display_list (DVBSubContext *ctx, DVBSubRegion *region)
static void	delete_state (DVBSubContext *ctx)
static av_cold int	dvbsub_init_decoder (AVCodecContext *avctx)
static av_cold int	dvbsub_close_decoder (AVCodecContext *avctx)
static int	dvbsub_read_2bit_string (uint8_t *destbuf, int dbuf_len, const uint8_t **srcbuf, int buf_size, int non_mod, uint8_t *map_table)
static int	dvbsub_read_4bit_string (uint8_t *destbuf, int dbuf_len, const uint8_t **srcbuf, int buf_size, int non_mod, uint8_t *map_table)
static int	dvbsub_read_8bit_string (uint8_t *destbuf, int dbuf_len, const uint8_t **srcbuf, int buf_size, int non_mod, uint8_t *map_table)
static void	dvbsub_parse_pixel_data_block (AVCodecContext *avctx, DVBSubObjectDisplay *display, const uint8_t *buf, int buf_size, int top_bottom, int non_mod)
static void	dvbsub_parse_object_segment (AVCodecContext *avctx, const uint8_t *buf, int buf_size)
static void	dvbsub_parse_clut_segment (AVCodecContext *avctx, const uint8_t *buf, int buf_size)
static void	dvbsub_parse_region_segment (AVCodecContext *avctx, const uint8_t *buf, int buf_size)
static void	dvbsub_parse_page_segment (AVCodecContext *avctx, const uint8_t *buf, int buf_size)
static int	dvbsub_display_end_segment (AVCodecContext *avctx, const uint8_t *buf, int buf_size, AVSubtitle *sub)
static int	dvbsub_decode (AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
Variables
static DVBSubCLUT	default_clut
AVCodec	dvbsub_decoder

---

Define Documentation

#define cm   (ff_cropTbl + MAX_NEG_CROP)

Definition at line 36 of file dvbsubdec.c.

Referenced by add_pixels_clamped2_c(), add_pixels_clamped4_c(), add_pixels_clamped_c(), cavs_idct8_add_c(), deinterlace_line(), deinterlace_line_inplace(), ff_bfin_vp3_idct_put(), ff_h264_idct8_add_c(), ff_h264_idct8_dc_add_c(), ff_h264_idct_dc_add_c(), ff_idct_put_mlib(), ff_jref_idct1_add(), ff_jref_idct1_put(), h_block_filter(), idct(), idct4col_add(), idct4col_put(), idct_add(), idct_internal(), idct_put(), idctSparseColAdd(), idctSparseColPut(), img_convert_init(), intra_pred_plane(), mp_yuv_to_rgb(), pred16x16_plane_compat_c(), pred8x8_plane_c(), Process(), put_pixels_clamped2_c(), put_pixels_clamped4_c(), put_pixels_clamped_c(), svq3_add_idct_c(), v_block_filter(), vc1_inv_trans_4x4_c(), vc1_inv_trans_4x8_c(), vc1_inv_trans_8x4_c(), wmv2_mspel8_h_lowpass(), wmv2_mspel8_v_lowpass(), and yuv_a_to_rgba().

#define DVBSUB_CLUT_SEGMENT   0x12

Definition at line 32 of file dvbsubdec.c.

Referenced by dvbsub_decode().

#define DVBSUB_DISPLAY_SEGMENT   0x80

Definition at line 34 of file dvbsubdec.c.

Referenced by dvbsub_decode().

#define DVBSUB_OBJECT_SEGMENT   0x13

Definition at line 33 of file dvbsubdec.c.

Referenced by dvbsub_decode().

#define DVBSUB_PAGE_SEGMENT   0x10

Definition at line 30 of file dvbsubdec.c.

Referenced by dvbsub_decode().

#define DVBSUB_REGION_SEGMENT   0x11

Definition at line 31 of file dvbsubdec.c.

Referenced by dvbsub_decode().

#define RGBA	(	r,
		g,
		b,
		a		)	(((a) << 24) | ((r) << 16) | ((g) << 8) | (b))

Definition at line 154 of file dvbsubdec.c.

Referenced by dvbsub_init_decoder(), and dvbsub_parse_clut_segment().

---

Function Documentation

static void delete_region_display_list	(	DVBSubContext *	ctx,
		DVBSubRegion *	region
	)			[static]

Definition at line 266 of file dvbsubdec.c.

References av_free(), DVBSubObject::display_list, DVBSubRegion::display_list, get_object(), DVBSubObject::next, DVBSubObjectDisplay::object_id, DVBSubContext::object_list, DVBSubObjectDisplay::object_list_next, and DVBSubObjectDisplay::region_list_next.

Referenced by delete_state(), and dvbsub_parse_region_segment().

{
    DVBSubObject *object, *obj2, **obj2_ptr;
    DVBSubObjectDisplay *display, *obj_disp, **obj_disp_ptr;

    while (region->display_list) {
        display = region->display_list;

        object = get_object(ctx, display->object_id);

        if (object) {
            obj_disp_ptr = &object->display_list;
            obj_disp = *obj_disp_ptr;

            while (obj_disp && obj_disp != display) {
                obj_disp_ptr = &obj_disp->object_list_next;
                obj_disp = *obj_disp_ptr;
            }

            if (obj_disp) {
                *obj_disp_ptr = obj_disp->object_list_next;

                if (!object->display_list) {
                    obj2_ptr = &ctx->object_list;
                    obj2 = *obj2_ptr;

                    while (obj2 != object) {
                        assert(obj2);
                        obj2_ptr = &obj2->next;
                        obj2 = *obj2_ptr;
                    }

                    *obj2_ptr = obj2->next;

                    av_free(obj2);
                }
            }
        }

        region->display_list = display->region_list_next;

        av_free(display);
    }

}

static void delete_state

(

DVBSubContext *

ctx

)

[static]

Definition at line 312 of file dvbsubdec.c.

References av_free(), av_log(), AV_LOG_ERROR, DVBSubContext::clut_list, delete_region_display_list(), DVBSubCLUT::next, DVBSubRegion::next, DVBSubContext::object_list, DVBSubRegion::pbuf, and DVBSubContext::region_list.

Referenced by dvbsub_close_decoder(), and dvbsub_parse_page_segment().

{
    DVBSubRegion *region;
    DVBSubCLUT *clut;

    while (ctx->region_list) {
        region = ctx->region_list;

        ctx->region_list = region->next;

        delete_region_display_list(ctx, region);
        if (region->pbuf)
            av_free(region->pbuf);

        av_free(region);
    }

    while (ctx->clut_list) {
        clut = ctx->clut_list;

        ctx->clut_list = clut->next;

        av_free(clut);
    }

    /* Should already be null */
    if (ctx->object_list)
        av_log(0, AV_LOG_ERROR, "Memory deallocation error!\n");
}

static av_cold int dvbsub_close_decoder

(

AVCodecContext *

avctx

)

[static]

Definition at line 415 of file dvbsubdec.c.

References av_free(), delete_state(), and AVCodecContext::priv_data.

{
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
    DVBSubRegionDisplay *display;

    delete_state(ctx);

    while (ctx->display_list) {
        display = ctx->display_list;
        ctx->display_list = display->next;

        av_free(display);
    }

    return 0;
}

static int dvbsub_decode	(	AVCodecContext *	avctx,
		void *	data,
		int *	data_size,
		const uint8_t *	buf,
		int	buf_size
	)			[static]

Definition at line 1343 of file dvbsubdec.c.

References DVBSubContext::ancillary_id, av_log(), AV_LOG_INFO, AV_RB16, DVBSubContext::composition_id, DVBSUB_CLUT_SEGMENT, dvbsub_display_end_segment(), DVBSUB_DISPLAY_SEGMENT, DVBSUB_OBJECT_SEGMENT, DVBSUB_PAGE_SEGMENT, dvbsub_parse_clut_segment(), dvbsub_parse_object_segment(), dvbsub_parse_page_segment(), dvbsub_parse_region_segment(), DVBSUB_REGION_SEGMENT, and AVCodecContext::priv_data.

{
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
    AVSubtitle *sub = (AVSubtitle*) data;
    const uint8_t *p, *p_end;
    int segment_type;
    int page_id;
    int segment_length;

#ifdef DEBUG_PACKET_CONTENTS
    int i;

    av_log(avctx, AV_LOG_INFO, "DVB sub packet:\n");

    for (i=0; i < buf_size; i++) {
        av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
        if (i % 16 == 15)
            av_log(avctx, AV_LOG_INFO, "\n");
    }

    if (i % 16)
        av_log(avctx, AV_LOG_INFO, "\n");

#endif

    if (buf_size <= 2)
        return -1;

    p = buf;
    p_end = buf + buf_size;

    while (p < p_end && *p == 0x0f) {
        p += 1;
        segment_type = *p++;
        page_id = AV_RB16(p);
        p += 2;
        segment_length = AV_RB16(p);
        p += 2;

        if (page_id == ctx->composition_id || page_id == ctx->ancillary_id) {
            switch (segment_type) {
            case DVBSUB_PAGE_SEGMENT:
                dvbsub_parse_page_segment(avctx, p, segment_length);
                break;
            case DVBSUB_REGION_SEGMENT:
                dvbsub_parse_region_segment(avctx, p, segment_length);
                break;
            case DVBSUB_CLUT_SEGMENT:
                dvbsub_parse_clut_segment(avctx, p, segment_length);
                break;
            case DVBSUB_OBJECT_SEGMENT:
                dvbsub_parse_object_segment(avctx, p, segment_length);
                break;
            case DVBSUB_DISPLAY_SEGMENT:
                *data_size = dvbsub_display_end_segment(avctx, p, segment_length, sub);
                break;
            default:
#ifdef DEBUG
                av_log(avctx, AV_LOG_INFO, "Subtitling segment type 0x%x, page id %d, length %d\n",
                        segment_type, page_id, segment_length);
#endif
                break;
            }
        }

        p += segment_length;
    }

    if (p != p_end) {
#ifdef DEBUG
        av_log(avctx, AV_LOG_INFO, "Junk at end of packet\n");
#endif
        return -1;
    }

    return buf_size;
}

static int dvbsub_display_end_segment	(	AVCodecContext *	avctx,
		const uint8_t *	buf,
		int	buf_size,
		AVSubtitle *	sub
	)			[static]

Definition at line 1269 of file dvbsubdec.c.

References av_malloc(), av_mallocz(), DVBSubRegion::buf_size, DVBSubRegion::clut, DVBSubCLUT::clut16, DVBSubCLUT::clut256, DVBSubCLUT::clut4, default_clut, DVBSubRegion::depth, DVBSubContext::display_list, DVBSubContext::display_list_size, AVSubtitle::end_display_time, AVSubtitle::format, get_clut(), get_region(), DVBSubRegion::height, DVBSubRegionDisplay::next, NULL, AVSubtitle::num_rects, DVBSubRegion::pbuf, AVCodecContext::priv_data, AVSubtitle::rects, DVBSubRegionDisplay::region_id, AVSubtitle::start_display_time, DVBSubContext::time_out, DVBSubRegion::width, AVSubtitleRect::x, DVBSubRegionDisplay::x_pos, and DVBSubRegionDisplay::y_pos.

Referenced by dvbsub_decode().

{
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

    DVBSubRegion *region;
    DVBSubRegionDisplay *display;
    AVSubtitleRect *rect;
    DVBSubCLUT *clut;
    uint32_t *clut_table;
    int i;

    sub->rects = NULL;
    sub->start_display_time = 0;
    sub->end_display_time = ctx->time_out * 1000;
    sub->format = 0;

    sub->num_rects = ctx->display_list_size;

    if (sub->num_rects > 0)
        sub->rects = av_mallocz(sizeof(AVSubtitleRect) * sub->num_rects);

    i = 0;

    for (display = ctx->display_list; display; display = display->next) {
        region = get_region(ctx, display->region_id);
        rect = &sub->rects[i];

        if (!region)
            continue;

        rect->x = display->x_pos;
        rect->y = display->y_pos;
        rect->w = region->width;
        rect->h = region->height;
        rect->nb_colors = 16;
        rect->linesize = region->width;

        clut = get_clut(ctx, region->clut);

        if (!clut)
            clut = &default_clut;

        switch (region->depth) {
        case 2:
            clut_table = clut->clut4;
            break;
        case 8:
            clut_table = clut->clut256;
            break;
        case 4:
        default:
            clut_table = clut->clut16;
            break;
        }

        rect->rgba_palette = av_malloc((1 << region->depth) * sizeof(uint32_t));
        memcpy(rect->rgba_palette, clut_table, (1 << region->depth) * sizeof(uint32_t));

        rect->bitmap = av_malloc(region->buf_size);
        memcpy(rect->bitmap, region->pbuf, region->buf_size);

        i++;
    }

    sub->num_rects = i;

#ifdef DEBUG_SAVE_IMAGES
    save_display_set(ctx);
#endif

    return 1;
}

static av_cold int dvbsub_init_decoder

(

AVCodecContext *

avctx

)

[static]

Definition at line 342 of file dvbsubdec.c.

References DVBSubContext::ancillary_id, DVBSubCLUT::clut16, DVBSubCLUT::clut256, DVBSubCLUT::clut4, DVBSubContext::composition_id, default_clut, g, DVBSubCLUT::id, DVBSubCLUT::next, NULL, AVCodecContext::priv_data, RGBA, and AVCodecContext::sub_id.

{
    int i, r, g, b, a = 0;
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

    memset(avctx->priv_data, 0, sizeof(DVBSubContext));

    ctx->composition_id = avctx->sub_id & 0xffff;
    ctx->ancillary_id = avctx->sub_id >> 16;

    default_clut.id = -1;
    default_clut.next = NULL;

    default_clut.clut4[0] = RGBA(  0,   0,   0,   0);
    default_clut.clut4[1] = RGBA(255, 255, 255, 255);
    default_clut.clut4[2] = RGBA(  0,   0,   0, 255);
    default_clut.clut4[3] = RGBA(127, 127, 127, 255);

    default_clut.clut16[0] = RGBA(  0,   0,   0,   0);
    for (i = 1; i < 16; i++) {
        if (i < 8) {
            r = (i & 1) ? 255 : 0;
            g = (i & 2) ? 255 : 0;
            b = (i & 4) ? 255 : 0;
        } else {
            r = (i & 1) ? 127 : 0;
            g = (i & 2) ? 127 : 0;
            b = (i & 4) ? 127 : 0;
        }
        default_clut.clut16[i] = RGBA(r, g, b, 255);
    }

    default_clut.clut256[0] = RGBA(  0,   0,   0,   0);
    for (i = 1; i < 256; i++) {
        if (i < 8) {
            r = (i & 1) ? 255 : 0;
            g = (i & 2) ? 255 : 0;
            b = (i & 4) ? 255 : 0;
            a = 63;
        } else {
            switch (i & 0x88) {
            case 0x00:
                r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
                g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
                b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
                a = 255;
                break;
            case 0x08:
                r = ((i & 1) ? 85 : 0) + ((i & 0x10) ? 170 : 0);
                g = ((i & 2) ? 85 : 0) + ((i & 0x20) ? 170 : 0);
                b = ((i & 4) ? 85 : 0) + ((i & 0x40) ? 170 : 0);
                a = 127;
                break;
            case 0x80:
                r = 127 + ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
                g = 127 + ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
                b = 127 + ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
                a = 255;
                break;
            case 0x88:
                r = ((i & 1) ? 43 : 0) + ((i & 0x10) ? 85 : 0);
                g = ((i & 2) ? 43 : 0) + ((i & 0x20) ? 85 : 0);
                b = ((i & 4) ? 43 : 0) + ((i & 0x40) ? 85 : 0);
                a = 255;
                break;
            }
        }
        default_clut.clut256[i] = RGBA(r, g, b, a);
    }

    return 0;
}

static void dvbsub_parse_clut_segment	(	AVCodecContext *	avctx,
		const uint8_t *	buf,
		int	buf_size
	)			[static]

Definition at line 895 of file dvbsubdec.c.

References av_log(), AV_LOG_ERROR, AV_LOG_INFO, av_malloc(), DVBSubContext::clut_list, default_clut, depth, g, get_clut(), AVCodecContext::priv_data, RGBA, YUV_TO_RGB1_CCIR, and YUV_TO_RGB2_CCIR.

Referenced by dvbsub_decode().

{
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

    const uint8_t *buf_end = buf + buf_size;
    int clut_id;
    DVBSubCLUT *clut;
    int entry_id, depth , full_range;
    int y, cr, cb, alpha;
    int r, g, b, r_add, g_add, b_add;

#ifdef DEBUG_PACKET_CONTENTS
    int i;

    av_log(avctx, AV_LOG_INFO, "DVB clut packet:\n");

    for (i=0; i < buf_size; i++) {
        av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
        if (i % 16 == 15)
            av_log(avctx, AV_LOG_INFO, "\n");
    }

    if (i % 16)
        av_log(avctx, AV_LOG_INFO, "\n");

#endif

    clut_id = *buf++;
    buf += 1;

    clut = get_clut(ctx, clut_id);

    if (!clut) {
        clut = av_malloc(sizeof(DVBSubCLUT));

        memcpy(clut, &default_clut, sizeof(DVBSubCLUT));

        clut->id = clut_id;

        clut->next = ctx->clut_list;
        ctx->clut_list = clut;
    }

    while (buf + 4 < buf_end) {
        entry_id = *buf++;

        depth = (*buf) & 0xe0;

        if (depth == 0) {
            av_log(avctx, AV_LOG_ERROR, "Invalid clut depth 0x%x!\n", *buf);
            return;
        }

        full_range = (*buf++) & 1;

        if (full_range) {
            y = *buf++;
            cr = *buf++;
            cb = *buf++;
            alpha = *buf++;
        } else {
            y = buf[0] & 0xfc;
            cr = (((buf[0] & 3) << 2) | ((buf[1] >> 6) & 3)) << 4;
            cb = (buf[1] << 2) & 0xf0;
            alpha = (buf[1] << 6) & 0xc0;

            buf += 2;
        }

        if (y == 0)
            alpha = 0xff;

        YUV_TO_RGB1_CCIR(cb, cr);
        YUV_TO_RGB2_CCIR(r, g, b, y);

#ifdef DEBUG
        av_log(avctx, AV_LOG_INFO, "clut %d := (%d,%d,%d,%d)\n", entry_id, r, g, b, alpha);
#endif

        if (depth & 0x80)
            clut->clut4[entry_id] = RGBA(r,g,b,255 - alpha);
        if (depth & 0x40)
            clut->clut16[entry_id] = RGBA(r,g,b,255 - alpha);
        if (depth & 0x20)
            clut->clut256[entry_id] = RGBA(r,g,b,255 - alpha);
    }
}

static void dvbsub_parse_object_segment	(	AVCodecContext *	avctx,
		const uint8_t *	buf,
		int	buf_size
	)			[static]

Definition at line 836 of file dvbsubdec.c.

References av_log(), AV_LOG_ERROR, AV_RB16, dvbsub_parse_pixel_data_block(), get_object(), and AVCodecContext::priv_data.

Referenced by dvbsub_decode().

{
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

    const uint8_t *buf_end = buf + buf_size;
    const uint8_t *block;
    int object_id;
    DVBSubObject *object;
    DVBSubObjectDisplay *display;
    int top_field_len, bottom_field_len;

    int coding_method, non_modifying_color;

    object_id = AV_RB16(buf);
    buf += 2;

    object = get_object(ctx, object_id);

    if (!object)
        return;

    coding_method = ((*buf) >> 2) & 3;
    non_modifying_color = ((*buf++) >> 1) & 1;

    if (coding_method == 0) {
        top_field_len = AV_RB16(buf);
        buf += 2;
        bottom_field_len = AV_RB16(buf);
        buf += 2;

        if (buf + top_field_len + bottom_field_len > buf_end) {
            av_log(avctx, AV_LOG_ERROR, "Field data size too large\n");
            return;
        }

        for (display = object->display_list; display; display = display->object_list_next) {
            block = buf;

            dvbsub_parse_pixel_data_block(avctx, display, block, top_field_len, 0,
                                            non_modifying_color);

            if (bottom_field_len > 0)
                block = buf + top_field_len;
            else
                bottom_field_len = top_field_len;

            dvbsub_parse_pixel_data_block(avctx, display, block, bottom_field_len, 1,
                                            non_modifying_color);
        }

/*  } else if (coding_method == 1) {*/

    } else {
        av_log(avctx, AV_LOG_ERROR, "Unknown object coding %d\n", coding_method);
    }

}

static void dvbsub_parse_page_segment	(	AVCodecContext *	avctx,
		const uint8_t *	buf,
		int	buf_size
	)			[static]

Definition at line 1101 of file dvbsubdec.c.

References av_free(), av_log(), AV_LOG_INFO, av_mallocz(), AV_RB16, delete_state(), DVBSubContext::display_list, DVBSubContext::display_list_size, NULL, AVCodecContext::priv_data, and DVBSubContext::time_out.

Referenced by dvbsub_decode().

{
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;
    DVBSubRegionDisplay *display;
    DVBSubRegionDisplay *tmp_display_list, **tmp_ptr;

    const uint8_t *buf_end = buf + buf_size;
    int region_id;
    int page_state;

    if (buf_size < 1)
        return;

    ctx->time_out = *buf++;
    page_state = ((*buf++) >> 2) & 3;

#ifdef DEBUG
    av_log(avctx, AV_LOG_INFO, "Page time out %ds, state %d\n", ctx->time_out, page_state);
#endif

    if (page_state == 2) {
        delete_state(ctx);
    }

    tmp_display_list = ctx->display_list;
    ctx->display_list = NULL;
    ctx->display_list_size = 0;

    while (buf + 5 < buf_end) {
        region_id = *buf++;
        buf += 1;

        display = tmp_display_list;
        tmp_ptr = &tmp_display_list;

        while (display && display->region_id != region_id) {
            tmp_ptr = &display->next;
            display = display->next;
        }

        if (!display)
            display = av_mallocz(sizeof(DVBSubRegionDisplay));

        display->region_id = region_id;

        display->x_pos = AV_RB16(buf);
        buf += 2;
        display->y_pos = AV_RB16(buf);
        buf += 2;

        *tmp_ptr = display->next;

        display->next = ctx->display_list;
        ctx->display_list = display;
        ctx->display_list_size++;

#ifdef DEBUG
        av_log(avctx, AV_LOG_INFO, "Region %d, (%d,%d)\n", region_id, display->x_pos, display->y_pos);
#endif
    }

    while (tmp_display_list) {
        display = tmp_display_list;

        tmp_display_list = display->next;

        av_free(display);
    }

}

static void dvbsub_parse_pixel_data_block	(	AVCodecContext *	avctx,
		DVBSubObjectDisplay *	display,
		const uint8_t *	buf,
		int	buf_size,
		int	top_bottom,
		int	non_mod
	)			[static]

Definition at line 717 of file dvbsubdec.c.

References av_log(), AV_LOG_ERROR, AV_LOG_INFO, dvbsub_read_2bit_string(), dvbsub_read_4bit_string(), dvbsub_read_8bit_string(), get_region(), NULL, AVCodecContext::priv_data, DVBSubObjectDisplay::region_id, DVBSubObjectDisplay::x_pos, and DVBSubObjectDisplay::y_pos.

Referenced by dvbsub_parse_object_segment().

{
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

    DVBSubRegion *region = get_region(ctx, display->region_id);
    const uint8_t *buf_end = buf + buf_size;
    uint8_t *pbuf;
    int x_pos, y_pos;
    int i;

    uint8_t map2to4[] = { 0x0,  0x7,  0x8,  0xf};
    uint8_t map2to8[] = {0x00, 0x77, 0x88, 0xff};
    uint8_t map4to8[] = {0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
                         0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};
    uint8_t *map_table;

#ifdef DEBUG
    av_log(avctx, AV_LOG_INFO, "DVB pixel block size %d, %s field:\n", buf_size,
                top_bottom ? "bottom" : "top");
#endif

#ifdef DEBUG_PACKET_CONTENTS
    for (i = 0; i < buf_size; i++) {
        if (i % 16 == 0)
            av_log(avctx, AV_LOG_INFO, "0x%08p: ", buf+i);

        av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]);
        if (i % 16 == 15)
            av_log(avctx, AV_LOG_INFO, "\n");
    }

    if (i % 16)
        av_log(avctx, AV_LOG_INFO, "\n");

#endif

    if (region == 0)
        return;

    pbuf = region->pbuf;

    x_pos = display->x_pos;
    y_pos = display->y_pos;

    if ((y_pos & 1) != top_bottom)
        y_pos++;

    while (buf < buf_end) {
        if (x_pos > region->width || y_pos > region->height) {
            av_log(avctx, AV_LOG_ERROR, "Invalid object location!\n");
            return;
        }

        switch (*buf++) {
        case 0x10:
            if (region->depth == 8)
                map_table = map2to8;
            else if (region->depth == 4)
                map_table = map2to4;
            else
                map_table = NULL;

            x_pos += dvbsub_read_2bit_string(pbuf + (y_pos * region->width) + x_pos,
                                                region->width - x_pos, &buf, buf_size,
                                                non_mod, map_table);
            break;
        case 0x11:
            if (region->depth < 4) {
                av_log(avctx, AV_LOG_ERROR, "4-bit pixel string in %d-bit region!\n", region->depth);
                return;
            }

            if (region->depth == 8)
                map_table = map4to8;
            else
                map_table = NULL;

            x_pos += dvbsub_read_4bit_string(pbuf + (y_pos * region->width) + x_pos,
                                                region->width - x_pos, &buf, buf_size,
                                                non_mod, map_table);
            break;
        case 0x12:
            if (region->depth < 8) {
                av_log(avctx, AV_LOG_ERROR, "8-bit pixel string in %d-bit region!\n", region->depth);
                return;
            }

            x_pos += dvbsub_read_8bit_string(pbuf + (y_pos * region->width) + x_pos,
                                                region->width - x_pos, &buf, buf_size,
                                                non_mod, NULL);
            break;

        case 0x20:
            map2to4[0] = (*buf) >> 4;
            map2to4[1] = (*buf++) & 0xf;
            map2to4[2] = (*buf) >> 4;
            map2to4[3] = (*buf++) & 0xf;
            break;
        case 0x21:
            for (i = 0; i < 4; i++)
                map2to8[i] = *buf++;
            break;
        case 0x22:
            for (i = 0; i < 16; i++)
                map4to8[i] = *buf++;
            break;

        case 0xf0:
            x_pos = display->x_pos;
            y_pos += 2;
            break;
        default:
            av_log(avctx, AV_LOG_INFO, "Unknown/unsupported pixel block 0x%x\n", *(buf-1));
        }
    }

}

static void dvbsub_parse_region_segment	(	AVCodecContext *	avctx,
		const uint8_t *	buf,
		int	buf_size
	)			[static]

Definition at line 985 of file dvbsubdec.c.

References av_free(), av_log(), AV_LOG_ERROR, AV_LOG_INFO, av_malloc(), av_mallocz(), AV_RB16, delete_region_display_list(), get_object(), get_region(), DVBSubContext::object_list, AVCodecContext::priv_data, DVBSubContext::region_list, DVBSubObject::type, and DVBSubRegion::width.

Referenced by dvbsub_decode().

{
    DVBSubContext *ctx = (DVBSubContext*) avctx->priv_data;

    const uint8_t *buf_end = buf + buf_size;
    int region_id, object_id;
    DVBSubRegion *region;
    DVBSubObject *object;
    DVBSubObjectDisplay *display;
    int fill;

    if (buf_size < 10)
        return;

    region_id = *buf++;

    region = get_region(ctx, region_id);

    if (!region) {
        region = av_mallocz(sizeof(DVBSubRegion));

        region->id = region_id;

        region->next = ctx->region_list;
        ctx->region_list = region;
    }

    fill = ((*buf++) >> 3) & 1;

    region->width = AV_RB16(buf);
    buf += 2;
    region->height = AV_RB16(buf);
    buf += 2;

    if (region->width * region->height != region->buf_size) {
        if (region->pbuf)
            av_free(region->pbuf);

        region->buf_size = region->width * region->height;

        region->pbuf = av_malloc(region->buf_size);

        fill = 1;
    }

    region->depth = 1 << (((*buf++) >> 2) & 7);
    if(region->depth<2 || region->depth>8){
        av_log(avctx, AV_LOG_ERROR, "region depth %d is invalid\n", region->depth);
        region->depth= 4;
    }
    region->clut = *buf++;

    if (region->depth == 8)
        region->bgcolor = *buf++;
    else {
        buf += 1;

        if (region->depth == 4)
            region->bgcolor = (((*buf++) >> 4) & 15);
        else
            region->bgcolor = (((*buf++) >> 2) & 3);
    }

#ifdef DEBUG
    av_log(avctx, AV_LOG_INFO, "Region %d, (%dx%d)\n", region_id, region->width, region->height);
#endif

    if (fill) {
        memset(region->pbuf, region->bgcolor, region->buf_size);
#ifdef DEBUG
        av_log(avctx, AV_LOG_INFO, "Fill region (%d)\n", region->bgcolor);
#endif
    }

    delete_region_display_list(ctx, region);

    while (buf + 5 < buf_end) {
        object_id = AV_RB16(buf);
        buf += 2;

        object = get_object(ctx, object_id);

        if (!object) {
            object = av_mallocz(sizeof(DVBSubObject));

            object->id = object_id;
            object->next = ctx->object_list;
            ctx->object_list = object;
        }

        object->type = (*buf) >> 6;

        display = av_mallocz(sizeof(DVBSubObjectDisplay));

        display->object_id = object_id;
        display->region_id = region_id;

        display->x_pos = AV_RB16(buf) & 0xfff;
        buf += 2;
        display->y_pos = AV_RB16(buf) & 0xfff;
        buf += 2;

        if ((object->type == 1 || object->type == 2) && buf+1 < buf_end) {
            display->fgcolor = *buf++;
            display->bgcolor = *buf++;
        }

        display->region_list_next = region->display_list;
        region->display_list = display;

        display->object_list_next = object->display_list;
        object->display_list = display;
    }
}

static int dvbsub_read_2bit_string	(	uint8_t *	destbuf,
		int	dbuf_len,
		const uint8_t **	srcbuf,
		int	buf_size,
		int	non_mod,
		uint8_t *	map_table
	)			[static]

Definition at line 432 of file dvbsubdec.c.

References av_log(), AV_LOG_ERROR, bits, get_bits(), get_bits1(), get_bits_count(), and init_get_bits().

Referenced by dvbsub_parse_pixel_data_block().

{
    GetBitContext gb;

    int bits;
    int run_length;
    int pixels_read = 0;

    init_get_bits(&gb, *srcbuf, buf_size << 8);

    while (get_bits_count(&gb) < (buf_size << 8) && pixels_read < dbuf_len) {
        bits = get_bits(&gb, 2);

        if (bits) {
            if (non_mod != 1 || bits != 1) {
                if (map_table)
                    *destbuf++ = map_table[bits];
                else
                    *destbuf++ = bits;
            }
            pixels_read++;
        } else {
            bits = get_bits1(&gb);
            if (bits == 1) {
                run_length = get_bits(&gb, 3) + 3;
                bits = get_bits(&gb, 2);

                if (non_mod == 1 && bits == 1)
                    pixels_read += run_length;
                else {
                    if (map_table)
                        bits = map_table[bits];
                    while (run_length-- > 0 && pixels_read < dbuf_len) {
                        *destbuf++ = bits;
                        pixels_read++;
                    }
                }
            } else {
                bits = get_bits1(&gb);
                if (bits == 0) {
                    bits = get_bits(&gb, 2);
                    if (bits == 2) {
                        run_length = get_bits(&gb, 4) + 12;
                        bits = get_bits(&gb, 2);

                        if (non_mod == 1 && bits == 1)
                            pixels_read += run_length;
                        else {
                            if (map_table)
                                bits = map_table[bits];
                            while (run_length-- > 0 && pixels_read < dbuf_len) {
                                *destbuf++ = bits;
                                pixels_read++;
                            }
                        }
                    } else if (bits == 3) {
                        run_length = get_bits(&gb, 8) + 29;
                        bits = get_bits(&gb, 2);

                        if (non_mod == 1 && bits == 1)
                            pixels_read += run_length;
                        else {
                            if (map_table)
                                bits = map_table[bits];
                            while (run_length-- > 0 && pixels_read < dbuf_len) {
                                *destbuf++ = bits;
                                pixels_read++;
                            }
                        }
                    } else if (bits == 1) {
                        pixels_read += 2;
                        if (map_table)
                            bits = map_table[0];
                        else
                            bits = 0;
                        if (pixels_read <= dbuf_len) {
                            *destbuf++ = bits;
                            *destbuf++ = bits;
                        }
                    } else {
                        (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;
                        return pixels_read;
                    }
                } else {
                    if (map_table)
                        bits = map_table[0];
                    else
                        bits = 0;
                    *destbuf++ = bits;
                    pixels_read++;
                }
            }
        }
    }

    if (get_bits(&gb, 6))
        av_log(0, AV_LOG_ERROR, "DVBSub error: line overflow\n");

    (*srcbuf) += (get_bits_count(&gb) + 7) >> 3;

    return pixels_read;
}

static int dvbsub_read_4bit_string	(	uint8_t *	destbuf,
		int	dbuf_len,
		const uint8_t **	srcbuf,
		int