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subtitle codec type support 

Originally committed as revision 4346 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Fabrice Bellard 2005-06-03 13:59:38 +00:00
parent c62112ff06
commit 240c1657dc
6 changed files with 933 additions and 3 deletions
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4
libavcodec/Makefile
View File

@ -17,8 +17,8 @@ OBJS= bitstream.o utils.o mem.o allcodecs.o \
ratecontrol.o adpcm.o eval.o error_resilience.o \
fft.o mdct.o raw.o golomb.o cabac.o\
dpcm.o adx.o rational.o faandct.o parser.o g726.o \
vp3dsp.o integer.o h264idct.o rangecoder.o pnm.o h263.o msmpeg4.o h263dec.o
vp3dsp.o integer.o h264idct.o rangecoder.o pnm.o h263.o msmpeg4.o h263dec.o dvdsub.o dvbsub.o
ifeq ($(CONFIG_AASC_DECODER),yes)
OBJS+= aasc.o
endif

5
libavcodec/allcodecs.c
View File

@ -551,6 +551,10 @@ PCM_CODEC(CODEC_ID_ADPCM_SWF, adpcm_swf);
#undef PCM_CODEC
/* subtitles */
register_avcodec(&dvdsub_decoder);
register_avcodec(&dvbsub_encoder);
/* parsers */
av_register_codec_parser(&mpegvideo_parser);
av_register_codec_parser(&mpeg4video_parser);
@ -568,5 +572,6 @@ PCM_CODEC(CODEC_ID_ADPCM_SWF, adpcm_swf);
#ifdef CONFIG_AC3
av_register_codec_parser(&ac3_parser);
#endif
av_register_codec_parser(&dvdsub_parser);
}

31
libavcodec/avcodec.h
View File

@ -17,7 +17,7 @@ extern "C" {
#define FFMPEG_VERSION_INT 0x000409
#define FFMPEG_VERSION "0.4.9-pre1"
#define LIBAVCODEC_BUILD 4755
#define LIBAVCODEC_BUILD 4756
#define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT
#define LIBAVCODEC_VERSION FFMPEG_VERSION
@ -175,6 +175,10 @@ enum CodecID {
CODEC_ID_GSM,
CODEC_ID_OGGTHEORA= 0x16000,
/* subtitle codecs */
CODEC_ID_DVD_SUBTITLE= 0x17000,
CODEC_ID_DVB_SUBTITLE,
CODEC_ID_MPEG2TS= 0x20000, /* _FAKE_ codec to indicate a raw MPEG2 transport
stream (only used by libavformat) */
@ -188,6 +192,7 @@ enum CodecType {
CODEC_TYPE_VIDEO,
CODEC_TYPE_AUDIO,
CODEC_TYPE_DATA,
CODEC_TYPE_SUBTITLE,
};
/**
@ -1880,6 +1885,20 @@ typedef struct AVPaletteControl {
} AVPaletteControl;
typedef struct AVSubtitle {
uint16_t format; /* 0 = graphics */
uint16_t x;
uint16_t y;
uint16_t w;
uint16_t h;
uint16_t nb_colors;
uint32_t start_display_time; /* relative to packet pts, in ms */
uint32_t end_display_time; /* relative to packet pts, in ms */
int linesize;
uint32_t *rgba_palette;
uint8_t *bitmap;
} AVSubtitle;
extern AVCodec ac3_encoder;
extern AVCodec mp2_encoder;
extern AVCodec mp3lame_encoder;
@ -2067,6 +2086,10 @@ extern AVCodec rawvideo_decoder;
extern AVCodec ac3_decoder;
extern AVCodec dts_decoder;
/* subtitles */
extern AVCodec dvdsub_decoder;
extern AVCodec dvbsub_encoder;
/* resample.c */
struct ReSampleContext;
@ -2204,6 +2227,9 @@ int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
int avcodec_decode_video(AVCodecContext *avctx, AVFrame *picture,
int *got_picture_ptr,
uint8_t *buf, int buf_size);
int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
int *got_sub_ptr,
const uint8_t *buf, int buf_size);
int avcodec_parse_frame(AVCodecContext *avctx, uint8_t **pdata,
int *data_size_ptr,
uint8_t *buf, int buf_size);
@ -2211,6 +2237,8 @@ int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size,
const short *samples);
int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
const AVFrame *pict);
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
const AVSubtitle *sub);
int avcodec_close(AVCodecContext *avctx);
@ -2310,6 +2338,7 @@ extern AVCodecParser mjpeg_parser;
extern AVCodecParser pnm_parser;
extern AVCodecParser mpegaudio_parser;
extern AVCodecParser ac3_parser;
extern AVCodecParser dvdsub_parser;
/* memory */
void *av_malloc(unsigned int size);

407
libavcodec/dvbsub.c Normal file
View File

@ -0,0 +1,407 @@
/*
* DVB subtitle encoding for ffmpeg
* Copyright (c) 2005 Fabrice Bellard.
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "avcodec.h"
typedef struct DVBSubtitleContext {
int hide_state;
int object_version;
} DVBSubtitleContext;
#define PUTBITS2(val)\
{\
bitbuf |= (val) << bitcnt;\
bitcnt -= 2;\
if (bitcnt < 0) {\
bitcnt = 6;\
*q++ = bitbuf;\
bitbuf = 0;\
}\
}
static void dvb_encode_rle2(uint8_t **pq,
const uint8_t *bitmap, int linesize,
int w, int h)
{
uint8_t *q;
unsigned int bitbuf;
int bitcnt;
int x, y, len, x1, v, color;
q = *pq;
for(y = 0; y < h; y++) {
*q++ = 0x10;
bitbuf = 0;
bitcnt = 6;
x = 0;
while (x < w) {
x1 = x;
color = bitmap[x1++];
while (x1 < w && bitmap[x1] == color)
x1++;
len = x1 - x;
if (color == 0 && len == 2) {
PUTBITS2(0);
PUTBITS2(0);
PUTBITS2(1);
} else if (len >= 3 && len <= 10) {
v = len - 3;
PUTBITS2(0);
PUTBITS2((v >> 2) | 2);
PUTBITS2(v & 3);
PUTBITS2(color);
} else if (len >= 12 && len <= 27) {
v = len - 12;
PUTBITS2(0);
PUTBITS2(0);
PUTBITS2(2);
PUTBITS2(v >> 2);
PUTBITS2(v & 3);
PUTBITS2(color);
} else if (len >= 29) {
/* length = 29 ... 284 */
if (len > 284)
len = 284;
v = len - 29;
PUTBITS2(0);
PUTBITS2(0);
PUTBITS2(3);
PUTBITS2((v >> 6));
PUTBITS2((v >> 4) & 3);
PUTBITS2((v >> 2) & 3);
PUTBITS2(v & 3);
PUTBITS2(color);
} else {
PUTBITS2(color);
if (color == 0) {
PUTBITS2(1);
}
len = 1;
}
x += len;
}
/* end of line */
PUTBITS2(0);
PUTBITS2(0);
PUTBITS2(0);
if (bitcnt != 6) {
*q++ = bitbuf;
}
*q++ = 0xf0;
bitmap += linesize;
}
*pq = q;
}
#define PUTBITS4(val)\
{\
bitbuf |= (val) << bitcnt;\
bitcnt -= 4;\
if (bitcnt < 0) {\
bitcnt = 4;\
*q++ = bitbuf;\
bitbuf = 0;\
}\
}
/* some DVB decoders only implement 4 bits/pixel */
static void dvb_encode_rle4(uint8_t **pq,
const uint8_t *bitmap, int linesize,
int w, int h)
{
uint8_t *q;
unsigned int bitbuf;
int bitcnt;
int x, y, len, x1, v, color;
q = *pq;
for(y = 0; y < h; y++) {
*q++ = 0x11;
bitbuf = 0;
bitcnt = 4;
x = 0;
while (x < w) {
x1 = x;
color = bitmap[x1++];
while (x1 < w && bitmap[x1] == color)
x1++;
len = x1 - x;
if (color == 0 && len == 2) {
PUTBITS4(0);
PUTBITS4(0xd);
} else if (color == 0 && (len >= 3 && len <= 9)) {
PUTBITS4(0);
PUTBITS4(len - 2);
} else if (len >= 4 && len <= 7) {
PUTBITS4(0);
PUTBITS4(8 + len - 4);
PUTBITS4(color);
} else if (len >= 9 && len <= 24) {
PUTBITS4(0);
PUTBITS4(0xe);
PUTBITS4(len - 9);
PUTBITS4(color);
} else if (len >= 25) {
if (len > 280)
len = 280;
v = len - 25;
PUTBITS4(0);
PUTBITS4(0xf);
PUTBITS4(v >> 4);
PUTBITS4(v & 0xf);
PUTBITS4(color);
} else {
PUTBITS4(color);
if (color == 0) {
PUTBITS4(0xc);
}
len = 1;
}
x += len;
}
/* end of line */
PUTBITS4(0);
PUTBITS4(0);
if (bitcnt != 4) {
*q++ = bitbuf;
}
*q++ = 0xf0;
bitmap += linesize;
}
*pq = q;
}
#define SCALEBITS 10
#define ONE_HALF (1 << (SCALEBITS - 1))
#define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5))
#define RGB_TO_Y_CCIR(r, g, b) \
((FIX(0.29900*219.0/255.0) * (r) + FIX(0.58700*219.0/255.0) * (g) + \
FIX(0.11400*219.0/255.0) * (b) + (ONE_HALF + (16 << SCALEBITS))) >> SCALEBITS)
#define RGB_TO_U_CCIR(r1, g1, b1, shift)\
(((- FIX(0.16874*224.0/255.0) * r1 - FIX(0.33126*224.0/255.0) * g1 + \
FIX(0.50000*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
#define RGB_TO_V_CCIR(r1, g1, b1, shift)\
(((FIX(0.50000*224.0/255.0) * r1 - FIX(0.41869*224.0/255.0) * g1 - \
FIX(0.08131*224.0/255.0) * b1 + (ONE_HALF << shift) - 1) >> (SCALEBITS + shift)) + 128)
static inline void putbe16(uint8_t **pq, uint16_t v)
{
uint8_t *q;
q = *pq;
*q++ = v >> 8;
*q++ = v;
*pq = q;
}
static int encode_dvb_subtitles(DVBSubtitleContext *s,
uint8_t *outbuf, AVSubtitle *h)
{
uint8_t *q, *pseg_len;
int page_id, region_id, clut_id, object_id, i, bpp_index, page_state;
q = outbuf;
page_id = 1;
region_id = 0;
clut_id = 0;
object_id = 0;
if (h->nb_colors <= 4) {
/* 2 bpp, some decoders do not support it correctly */
bpp_index = 0;
} else if (h->nb_colors <= 16) {
/* 4 bpp, standard encoding */
bpp_index = 1;
} else {
return -1;
}
*q++ = 0x00; /* subtitle_stream_id */
/* page composition segment */
*q++ = 0x0f; /* sync_byte */
*q++ = 0x10; /* segment_type */
putbe16(&q, page_id);
pseg_len = q;
q += 2; /* segment length */
*q++ = 30; /* page_timeout (seconds) */
if (s->hide_state)
page_state = 0; /* normal case */
else
page_state = 2; /* mode change */
/* page_version = 0 + page_state */
*q++ = s->object_version | (page_state << 2) | 3;
*q++ = region_id;
*q++ = 0xff; /* reserved */
putbe16(&q, 0); /* left pos */
putbe16(&q, 0); /* top pos */
putbe16(&pseg_len, q - pseg_len - 2);
if (!s->hide_state) {
/* CLUT segment */
*q++ = 0x0f; /* sync byte */
*q++ = 0x12; /* CLUT definition segment */
putbe16(&q, page_id);
pseg_len = q;
q += 2; /* segment length */
*q++ = clut_id;
*q++ = (0 << 4) | 0xf; /* version = 0 */
for(i = 0; i < h->nb_colors; i++) {
*q++ = i; /* clut_entry_id */
*q++ = (1 << (7 - bpp_index)) | (0xf << 1) | 1; /* 2 bits/pixel full range */
{
int a, r, g, b;
a = (h->rgba_palette[i] >> 24) & 0xff;
r = (h->rgba_palette[i] >> 16) & 0xff;
g = (h->rgba_palette[i] >> 8) & 0xff;
b = (h->rgba_palette[i] >> 0) & 0xff;
*q++ = RGB_TO_Y_CCIR(r, g, b);
*q++ = RGB_TO_V_CCIR(r, g, b, 0);
*q++ = RGB_TO_U_CCIR(r, g, b, 0);
*q++ = 255 - a;
}
}
putbe16(&pseg_len, q - pseg_len - 2);
}
/* region composition segment */
*q++ = 0x0f; /* sync_byte */
*q++ = 0x11; /* segment_type */
putbe16(&q, page_id);
pseg_len = q;
q += 2; /* segment length */
*q++ = region_id;
*q++ = (s->object_version << 4) | (0 << 3) | 0x07; /* version , no fill */
putbe16(&q, 720); /* region width */
putbe16(&q, 576); /* region height */
*q++ = ((1 + bpp_index) << 5) | ((1 + bpp_index) << 2) | 0x03;
*q++ = clut_id;
*q++ = 0; /* 8 bit fill colors */
*q++ = 0x03; /* 4 bit and 2 bit fill colors */
if (!s->hide_state) {
putbe16(&q, object_id);
*q++ = (0 << 6) | (0 << 4) | ((h->x >> 8) & 0xf);
*q++ = h->x;
*q++ = 0xf0 | ((h->y >> 8) & 0xf);
*q++ = h->y;
}
putbe16(&pseg_len, q - pseg_len - 2);
if (!s->hide_state) {
/* Object Data segment */
*q++ = 0x0f; /* sync byte */
*q++ = 0x13;
putbe16(&q, page_id);
pseg_len = q;
q += 2; /* segment length */
putbe16(&q, object_id);
*q++ = (s->object_version << 4) | (0 << 2) | (0 << 1) | 1; /* version = 0,
onject_coding_method,
non_modifying_color_flag */
{
uint8_t *ptop_field_len, *pbottom_field_len, *top_ptr, *bottom_ptr;
void (*dvb_encode_rle)(uint8_t **pq,
const uint8_t *bitmap, int linesize,
int w, int h);
ptop_field_len = q;
q += 2;
pbottom_field_len = q;
q += 2;
if (bpp_index == 0)
dvb_encode_rle = dvb_encode_rle2;
else
dvb_encode_rle = dvb_encode_rle4;
top_ptr = q;
dvb_encode_rle(&q, h->bitmap, h->w * 2, h->w, h->h >> 1);
bottom_ptr = q;
dvb_encode_rle(&q, h->bitmap + h->w, h->w * 2, h->w, h->h >> 1);
putbe16(&ptop_field_len, bottom_ptr - top_ptr);
putbe16(&pbottom_field_len, q - bottom_ptr);
}
putbe16(&pseg_len, q - pseg_len - 2);
}
/* end of display set segment */
*q++ = 0x0f; /* sync_byte */
*q++ = 0x80; /* segment_type */
putbe16(&q, page_id);
pseg_len = q;
q += 2; /* segment length */
putbe16(&pseg_len, q - pseg_len - 2);
*q++ = 0xff; /* end of PES data */
s->object_version = (s->object_version + 1) & 0xf;
s->hide_state = !s->hide_state;
return q - outbuf;
}
static int dvbsub_init_decoder(AVCodecContext *avctx)
{
return 0;
}
static int dvbsub_close_decoder(AVCodecContext *avctx)
{
return 0;
}
static int dvbsub_encode(AVCodecContext *avctx,
unsigned char *buf, int buf_size, void *data)
{
DVBSubtitleContext *s = avctx->priv_data;
AVSubtitle *sub = data;
int ret;
ret = encode_dvb_subtitles(s, buf, sub);
return ret;
}
AVCodec dvbsub_encoder = {
"dvbsub",
CODEC_TYPE_SUBTITLE,
CODEC_ID_DVB_SUBTITLE,
sizeof(DVBSubtitleContext),
dvbsub_init_decoder,
dvbsub_encode,
dvbsub_close_decoder,
};

459
libavcodec/dvdsub.c Normal file
View File

@ -0,0 +1,459 @@
/*
* DVD subtitle decoding for ffmpeg
* Copyright (c) 2005 Fabrice Bellard.
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "avcodec.h"
//#define DEBUG
typedef struct DVDSubContext {
} DVDSubContext;
static int dvdsub_init_decoder(AVCodecContext *avctx)
{
return 0;
}
uint16_t getbe16(const uint8_t *p)
{
return (p[0] << 8) | p[1];
}
int get_nibble(const uint8_t *buf, int nibble_offset)
{
return (buf[nibble_offset >> 1] >> ((1 - (nibble_offset & 1)) << 2)) & 0xf;
}
static int decode_rle(uint8_t *bitmap, int linesize, int w, int h,
const uint8_t *buf, int nibble_offset, int buf_size)
{
unsigned int v;
int x, y, len, color, nibble_end;
uint8_t *d;
nibble_end = buf_size * 2;
x = 0;
y = 0;
d = bitmap;
for(;;) {
if (nibble_offset >= nibble_end)
return -1;
v = get_nibble(buf, nibble_offset++);
if (v < 0x4) {
v = (v << 4) | get_nibble(buf, nibble_offset++);
if (v < 0x10) {
v = (v << 4) | get_nibble(buf, nibble_offset++);
if (v < 0x040) {
v = (v << 4) | get_nibble(buf, nibble_offset++);
if (v < 4) {
v |= (w - x) << 2;
}
}
}
}
len = v >> 2;
if (len > (w - x))
len = (w - x);
color = v & 0x03;
memset(d + x, color, len);
x += len;
if (x >= w) {
y++;
if (y >= h)
break;
d += linesize;
x = 0;
/* byte align */
nibble_offset += (nibble_offset & 1);
}
}
return 0;
}
static void guess_palette(uint32_t *rgba_palette,
uint8_t *palette,
uint8_t *alpha,
uint32_t subtitle_color)
{
uint8_t color_used[16];
int nb_opaque_colors, i, level, j, r, g, b;
for(i = 0; i < 4; i++)
rgba_palette[i] = 0;
memset(color_used, 0, 16);
nb_opaque_colors = 0;
for(i = 0; i < 4; i++) {
if (alpha[i] != 0 && !color_used[palette[i]]) {
color_used[palette[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[palette[i]]) {
level = (0xff * (j + 1)) / nb_opaque_colors;
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) | (0xff << 24);
color_used[palette[i]] = (i + 1);
j++;
} else {
rgba_palette[i] = rgba_palette[color_used[palette[i]] - 1];
}
}
}
}
static int decode_dvd_subtitles(AVSubtitle *sub_header,
const uint8_t *buf, int buf_size)
{
int cmd_pos, pos, cmd, x1, y1, x2, y2, offset1, offset2, next_cmd_pos;
uint8_t palette[4], alpha[4];
int date;
if (buf_size < 4)
return -1;
sub_header->bitmap = NULL;
sub_header->rgba_palette = NULL;
sub_header->start_display_time = 0;
sub_header->end_display_time = 0;
cmd_pos = getbe16(buf + 2);
while ((cmd_pos + 4) < buf_size) {
date = getbe16(buf + cmd_pos);
next_cmd_pos = getbe16(buf + cmd_pos + 2);
#ifdef DEBUG
av_log(NULL, AV_LOG_INFO, "cmd_pos=0x%04x next=0x%04x date=%d\n",
cmd_pos, next_cmd_pos, date);
#endif
pos = cmd_pos + 4;
offset1 = -1;
offset2 = -1;
x1 = y1 = x2 = y2 = 0;
while (pos < buf_size) {
cmd = buf[pos++];
#ifdef DEBUG
av_log(NULL, AV_LOG_INFO, "cmd=%02x\n", cmd);
#endif
switch(cmd) {
case 0x00:
/* force display */
break;
case 0x01:
/* set start date */
sub_header->start_display_time = date * 10;
break;
case 0x02:
/* set end date */
sub_header->end_display_time = date * 10;
break;
case 0x03:
/* set palette */
if ((buf_size - pos) < 2)
goto fail;
palette[0] = buf[pos] >> 4;
palette[1] = buf[pos] & 0x0f;
palette[2] = buf[pos + 1] >> 4;
palette[3] = buf[pos + 1] & 0x0f;
pos += 2;
break;
case 0x04:
/* set alpha */
if ((buf_size - pos) < 2)
goto fail;
alpha[0] = buf[pos] >> 4;
alpha[1] = buf[pos] & 0x0f;
alpha[2] = buf[pos + 1] >> 4;
alpha[3] = buf[pos + 1] & 0x0f;
pos += 2;
break;
case 0x05:
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];
#ifdef DEBUG
av_log(NULL, AV_LOG_INFO, "x1=%d x2=%d y1=%d y2=%d\n",
x1, x2, y1, y2);
#endif
pos += 6;
break;
case 0x06:
if ((buf_size - pos) < 4)
goto fail;
offset1 = getbe16(buf + pos);
offset2 = getbe16(buf + pos + 2);
#ifdef DEBUG
av_log(NULL, AV_LOG_INFO, "offset1=0x%04x offset2=0x%04x\n", offset1, offset2);
#endif
pos += 4;
break;
case 0xff:
default:
goto the_end;
}
}
the_end:
if (offset1 >= 0) {
int w, h;
uint8_t *bitmap;
/* decode the bitmap */
w = x2 - x1 + 1;
if (w < 0)
w = 0;
h = y2 - y1;
if (h < 0)
h = 0;
if (w > 0 && h > 0) {
av_freep(&sub_header->bitmap);
av_freep(&sub_header->rgba_palette);
bitmap = av_malloc(w * h);
sub_header->rgba_palette = av_malloc(4 * 4);
decode_rle(bitmap, w * 2, w, h / 2,
buf, offset1 * 2, buf_size);
decode_rle(bitmap + w, w * 2, w, h / 2,
buf, offset2 * 2, buf_size);
guess_palette(sub_header->rgba_palette,
palette, alpha, 0xffff00);
sub_header->x = x1;
sub_header->y = y1;
sub_header->w = w;
sub_header->h = h;
sub_header->nb_colors = 4;
sub_header->linesize = w;
sub_header->bitmap = bitmap;
}
}
if (next_cmd_pos == cmd_pos)
break;
cmd_pos = next_cmd_pos;
}
if (sub_header->bitmap)
return 0;
fail:
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_bouding_rectangle(AVSubtitle *s)
{
uint8_t transp_color[256];
int y1, y2, x1, x2, y, w, h, i;
uint8_t *bitmap;
if (s->w <= 0 || s->h <= 0)
return 0;
memset(transp_color, 0, 256);
for(i = 0; i < s->nb_colors; i++) {
if ((s->rgba_palette[i] >> 24) == 0)
transp_color[i] = 1;
}
y1 = 0;
while (y1 < s->h && is_transp(s->bitmap + y1 * s->linesize, 1, s->w,
transp_color))
y1++;
if (y1 == s->h) {
av_freep(&s->bitmap);
s->w = s->h = 0;
return 0;
}
y2 = s->h - 1;
while (y2 > 0 && is_transp(s->bitmap + y2 * s->linesize, 1, s->w,
transp_color))
y2--;
x1 = 0;
while (x1 < (s->w - 1) && is_transp(s->bitmap + x1, s->linesize, s->h,
transp_color))
x1++;
x2 = s->w - 1;
while (x2 > 0 && is_transp(s->bitmap + x2, s->linesize, s->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->bitmap + x1 + (y1 + y) * s->linesize, w);
}
av_freep(&s->bitmap);
s->bitmap = bitmap;
s->linesize = w;
s->w = w;
s->h = h;
s->x += x1;
s->y += y1;
return 1;
}
static int dvdsub_close_decoder(AVCodecContext *avctx)
{
return 0;
}
#ifdef DEBUG
#undef fprintf
static void ppm_save(const char *filename, uint8_t *bitmap, int w, int h,
uint32_t *rgba_palette)
{
int x, y, v;
FILE *f;
f = fopen(filename, "w");
if (!f) {
perror(filename);
exit(1);
}
fprintf(f, "P6\n"
"%d %d\n"
"%d\n",
w, h, 255);
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);
}
}
fclose(f);
}
#endif
static int dvdsub_decode(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
AVSubtitle *sub = (void *)data;
if (decode_dvd_subtitles(sub, buf, buf_size) < 0) {
no_subtitle:
*data_size = 0;
return buf_size;
}
if (find_smallest_bouding_rectangle(sub) == 0)
goto no_subtitle;
#if defined(DEBUG)
av_log(NULL, AV_LOG_INFO, "start=%d ms end =%d ms\n",
sub->start_display_time,
sub->end_display_time);
ppm_save("/tmp/a.ppm", sub->bitmap,
sub->w, sub->h, sub->rgba_palette);
#endif
*data_size = 1;
return buf_size;
}
AVCodec dvdsub_decoder = {
"dvdsub",
CODEC_TYPE_SUBTITLE,
CODEC_ID_DVD_SUBTITLE,
sizeof(DVDSubContext),
dvdsub_init_decoder,
NULL,
dvdsub_close_decoder,
dvdsub_decode,
};
/* parser definition */
typedef struct DVDSubParseContext {
uint8_t *packet;
int packet_len;
int packet_index;
} DVDSubParseContext;
static int dvdsub_parse_init(AVCodecParserContext *s)
{
return 0;
}
static int dvdsub_parse(AVCodecParserContext *s,
AVCodecContext *avctx,
uint8_t **poutbuf, int *poutbuf_size,
const uint8_t *buf, int buf_size)
{
DVDSubParseContext *pc = s->priv_data;
if (pc->packet_index == 0) {
if (buf_size < 2)
return 0;
pc->packet_len = (buf[0] << 8) | buf[1];
av_freep(&pc->packet);
pc->packet = av_malloc(pc->packet_len);
}
if (pc->packet) {
if (pc->packet_index + buf_size <= pc->packet_len) {
memcpy(pc->packet + pc->packet_index, buf, buf_size);
pc->packet_index += buf_size;
if (pc->packet_index >= pc->packet_len) {
*poutbuf = pc->packet;
*poutbuf_size = pc->packet_len;
pc->packet_index = 0;
return buf_size;
}
} else {
/* erroneous size */
pc->packet_index = 0;
}
}
*poutbuf = NULL;
*poutbuf_size = 0;
return buf_size;
}
static void dvdsub_parse_close(AVCodecParserContext *s)
{
DVDSubParseContext *pc = s->priv_data;
av_freep(&pc->packet);
}
AVCodecParser dvdsub_parser = {
{ CODEC_ID_DVD_SUBTITLE },
sizeof(DVDSubParseContext),
dvdsub_parse_init,
dvdsub_parse,
dvdsub_parse_close,
};

30
libavcodec/utils.c
View File

@ -590,6 +590,15 @@ int avcodec_encode_video(AVCodecContext *avctx, uint8_t *buf, int buf_size,
return 0;
}
int avcodec_encode_subtitle(AVCodecContext *avctx, uint8_t *buf, int buf_size,
const AVSubtitle *sub)
{
int ret;
ret = avctx->codec->encode(avctx, buf, buf_size, (void *)sub);
avctx->frame_number++;
return ret;
}
/**
* decode a frame.
* @param buf bitstream buffer, must be FF_INPUT_BUFFER_PADDING_SIZE larger then the actual read bytes
@ -639,6 +648,23 @@ int avcodec_decode_audio(AVCodecContext *avctx, int16_t *samples,
return ret;
}
/* decode a subtitle message. return -1 if error, otherwise return the
*number of bytes used. If no subtitle could be decompressed,
*got_sub_ptr is zero. Otherwise, the subtitle is stored in *sub. */
int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtitle *sub,
int *got_sub_ptr,
const uint8_t *buf, int buf_size)
{
int ret;
*got_sub_ptr = 0;
ret = avctx->codec->decode(avctx, sub, got_sub_ptr,
(uint8_t *)buf, buf_size);
if (*got_sub_ptr)
avctx->frame_number++;
return ret;
}
int avcodec_close(AVCodecContext *avctx)
{
if (avctx->codec->close)
@ -808,6 +834,10 @@ void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode)
snprintf(buf, buf_size, "Data: %s", codec_name);
bitrate = enc->bit_rate;
break;
case CODEC_TYPE_SUBTITLE:
snprintf(buf, buf_size, "Subtitle: %s", codec_name);
bitrate = enc->bit_rate;
break;
default:
snprintf(buf, buf_size, "Invalid Codec type %d", enc->codec_type);
return;