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https://github.com/FFmpeg/FFmpeg.git
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Add HD-DVD subpicture decoding.
Patch by: Ian Caulfield, ian caulfield & gmx at Originally committed as revision 9788 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ian Caulfield
Panagiotis Issaris
parent
a363effbdf
commit
1aadf63fd1
@ -19,50 +19,92 @@
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "bitstream.h"
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#include "colorspace.h"
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#include "dsputil.h"
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//#define DEBUG
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static void yuv_a_to_rgba(const uint8_t *ycbcr, const uint8_t *alpha, uint32_t *rgba, int num_values)
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{
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uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
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uint8_t r, g, b;
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int i, y, cb, cr;
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int r_add, g_add, b_add;
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for (i = num_values; i > 0; i--) {
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y = *ycbcr++;
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cb = *ycbcr++;
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cr = *ycbcr++;
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YUV_TO_RGB1_CCIR(cb, cr);
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YUV_TO_RGB2_CCIR(r, g, b, y);
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*rgba++ = (*alpha++ << 24) | (r << 16) | (g << 8) | b;
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}
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}
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static int dvdsub_init_decoder(AVCodecContext *avctx)
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{
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return 0;
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}
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static int get_nibble(const uint8_t *buf, int nibble_offset)
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static int decode_run_2bit(GetBitContext *gb, int *color)
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{
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return (buf[nibble_offset >> 1] >> ((1 - (nibble_offset & 1)) << 2)) & 0xf;
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unsigned int v, t;
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v = 0;
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for (t = 1; v < t && t <= 0x40; t <<= 2)
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v = (v << 4) | get_bits(gb, 4);
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*color = v & 3;
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if (v < 4) { /* Code for fill rest of line */
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return INT_MAX;
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}
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return v >> 2;
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}
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static int decode_run_8bit(GetBitContext *gb, int *color)
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{
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int len;
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int has_run = get_bits1(gb);
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if (get_bits1(gb))
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*color = get_bits(gb, 8);
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else
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*color = get_bits(gb, 2);
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if (has_run) {
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if (get_bits1(gb)) {
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len = get_bits(gb, 7);
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if (len == 0)
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len = INT_MAX;
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else
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len += 9;
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} else
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len = get_bits(gb, 3) + 2;
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} else
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len = 1;
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return len;
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}
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static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
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const uint8_t *buf, int nibble_offset, int buf_size)
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const uint8_t *buf, int start, int buf_size, int is_8bit)
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{
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unsigned int v;
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int x, y, len, color, nibble_end;
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GetBitContext gb;
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int bit_len;
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int x, y, len, color;
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uint8_t *d;
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nibble_end = buf_size * 2;
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bit_len = (buf_size - start) * 8;
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init_get_bits(&gb, buf + start, bit_len);
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x = 0;
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y = 0;
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d = bitmap;
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for(;;) {
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if (nibble_offset >= nibble_end)
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if (get_bits_count(&gb) > bit_len)
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return -1;
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v = get_nibble(buf, nibble_offset++);
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if (v < 0x4) {
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v = (v << 4) | get_nibble(buf, nibble_offset++);
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if (v < 0x10) {
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v = (v << 4) | get_nibble(buf, nibble_offset++);
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if (v < 0x040) {
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v = (v << 4) | get_nibble(buf, nibble_offset++);
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if (v < 4) {
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v |= (w - x) << 2;
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}
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}
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}
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}
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len = v >> 2;
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if (len > (w - x))
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len = (w - x);
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color = v & 0x03;
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if (is_8bit)
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len = decode_run_8bit(&gb, &color);
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else
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len = decode_run_2bit(&gb, &color);
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len = FFMIN(len, w - x);
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memset(d + x, color, len);
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x += len;
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if (x >= w) {
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@ -72,7 +114,7 @@ static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
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d += linesize;
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x = 0;
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/* byte align */
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nibble_offset += (nibble_offset & 1);
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align_get_bits(&gb);
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}
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}
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return 0;
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@ -121,31 +163,46 @@ static void guess_palette(uint32_t *rgba_palette,
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}
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}
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#define READ_OFFSET(a) (big_offsets ? AV_RB32(a) : AV_RB16(a))
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static int decode_dvd_subtitles(AVSubtitle *sub_header,
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const uint8_t *buf, int buf_size)
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{
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int cmd_pos, pos, cmd, x1, y1, x2, y2, offset1, offset2, next_cmd_pos;
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uint8_t colormap[4], alpha[4];
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int big_offsets, offset_size, is_8bit = 0;
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const uint8_t *yuv_palette = 0;
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uint8_t colormap[4], alpha[256];
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int date;
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int i;
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int is_menu = 0;
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if (buf_size < 4)
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if (buf_size < 10)
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return -1;
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sub_header->rects = NULL;
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sub_header->num_rects = 0;
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sub_header->start_display_time = 0;
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sub_header->end_display_time = 0;
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cmd_pos = AV_RB16(buf + 2);
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while ((cmd_pos + 4) < buf_size) {
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if (AV_RB16(buf) == 0) { /* HD subpicture with 4-byte offsets */
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big_offsets = 1;
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offset_size = 4;
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cmd_pos = 6;
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} else {
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big_offsets = 0;
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offset_size = 2;
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cmd_pos = 2;
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}
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cmd_pos = READ_OFFSET(buf + cmd_pos);
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while ((cmd_pos + 2 + offset_size) < buf_size) {
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date = AV_RB16(buf + cmd_pos);
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next_cmd_pos = AV_RB16(buf + cmd_pos + 2);
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next_cmd_pos = READ_OFFSET(buf + cmd_pos + 2);
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#ifdef DEBUG
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av_log(NULL, AV_LOG_INFO, "cmd_pos=0x%04x next=0x%04x date=%d\n",
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cmd_pos, next_cmd_pos, date);
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#endif
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pos = cmd_pos + 4;
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pos = cmd_pos + 2 + offset_size;
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offset1 = -1;
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offset2 = -1;
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x1 = y1 = x2 = y2 = 0;
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@ -191,12 +248,15 @@ static int decode_dvd_subtitles(AVSubtitle *sub_header,
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#endif
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break;
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case 0x05:
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case 0x85:
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if ((buf_size - pos) < 6)
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goto fail;
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x1 = (buf[pos] << 4) | (buf[pos + 1] >> 4);
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x2 = ((buf[pos + 1] & 0x0f) << 8) | buf[pos + 2];
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y1 = (buf[pos + 3] << 4) | (buf[pos + 4] >> 4);
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y2 = ((buf[pos + 4] & 0x0f) << 8) | buf[pos + 5];
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if (cmd & 0x80)
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is_8bit = 1;
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#ifdef DEBUG
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av_log(NULL, AV_LOG_INFO, "x1=%d x2=%d y1=%d y2=%d\n",
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x1, x2, y1, y2);
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@ -213,8 +273,39 @@ static int decode_dvd_subtitles(AVSubtitle *sub_header,
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#endif
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pos += 4;
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break;
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case 0x86:
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if ((buf_size - pos) < 8)
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goto fail;
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offset1 = AV_RB32(buf + pos);
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offset2 = AV_RB32(buf + pos + 4);
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#ifdef DEBUG
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av_log(NULL, AV_LOG_INFO, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);
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#endif
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pos += 8;
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break;
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case 0x83:
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/* HD set palette */
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if ((buf_size - pos) < 768)
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goto fail;
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yuv_palette = buf + pos;
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pos += 768;
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break;
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case 0x84:
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/* HD set contrast (alpha) */
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if ((buf_size - pos) < 256)
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goto fail;
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for (i = 0; i < 256; i++)
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alpha[i] = 0xFF - buf[pos+i];
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pos += 256;
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break;
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case 0xff:
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goto the_end;
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default:
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#ifdef DEBUG
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av_log(NULL, AV_LOG_INFO, "unrecognised subpicture command 0x%x\n", cmd);
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#endif
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goto the_end;
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}
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}
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@ -243,20 +334,28 @@ static int decode_dvd_subtitles(AVSubtitle *sub_header,
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bitmap = av_malloc(w * h);
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sub_header->rects = av_mallocz(sizeof(AVSubtitleRect));
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sub_header->num_rects = 1;
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sub_header->rects[0].rgba_palette = av_malloc(4 * 4);
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sub_header->rects[0].bitmap = bitmap;
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decode_rle(bitmap, w * 2, w, (h + 1) / 2,
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buf, offset1 * 2, buf_size);
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buf, offset1, buf_size, is_8bit);
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decode_rle(bitmap + w, w * 2, w, h / 2,
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buf, offset2 * 2, buf_size);
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buf, offset2, buf_size, is_8bit);
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if (is_8bit) {
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if (yuv_palette == 0)
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goto fail;
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sub_header->rects[0].rgba_palette = av_malloc(256 * 4);
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sub_header->rects[0].nb_colors = 256;
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yuv_a_to_rgba(yuv_palette, alpha, sub_header->rects[0].rgba_palette, 256);
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} else {
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sub_header->rects[0].rgba_palette = av_malloc(4 * 4);
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sub_header->rects[0].nb_colors = 4;
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guess_palette(sub_header->rects[0].rgba_palette,
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colormap, alpha, 0xffff00);
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}
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sub_header->rects[0].x = x1;
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sub_header->rects[0].y = y1;
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sub_header->rects[0].w = w;
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sub_header->rects[0].h = h;
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sub_header->rects[0].nb_colors = 4;
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sub_header->rects[0].linesize = w;
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sub_header->rects[0].bitmap = bitmap;
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}
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}
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if (next_cmd_pos == cmd_pos)
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@ -266,6 +365,14 @@ static int decode_dvd_subtitles(AVSubtitle *sub_header,
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if (sub_header->num_rects > 0)
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return is_menu;
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fail:
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if (sub_header->rects != NULL) {
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for (i = 0; i < sub_header->num_rects; i++) {
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av_free(sub_header->rects[i].bitmap);
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av_free(sub_header->rects[i].rgba_palette);
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}
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av_freep(&sub_header->rects);
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sub_header->num_rects = 0;
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}
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return -1;
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}
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