0,0 → 1,165 |
/* |
* 3GPP TS 26.245 Timed Text encoder |
* Copyright (c) 2012 Philip Langdale <philipl@overt.org> |
* |
* 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 |
*/ |
|
#include <stdarg.h> |
#include "avcodec.h" |
#include "libavutil/avassert.h" |
#include "libavutil/avstring.h" |
#include "libavutil/intreadwrite.h" |
#include "ass_split.h" |
#include "ass.h" |
|
typedef struct { |
ASSSplitContext *ass_ctx; |
char buffer[2048]; |
char *ptr; |
char *end; |
} MovTextContext; |
|
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static av_cold int mov_text_encode_init(AVCodecContext *avctx) |
{ |
/* |
* For now, we'll use a fixed default style. When we add styling |
* support, this will be generated from the ASS style. |
*/ |
static uint8_t text_sample_entry[] = { |
0x00, 0x00, 0x00, 0x00, // uint32_t displayFlags |
0x01, // int8_t horizontal-justification |
0xFF, // int8_t vertical-justification |
0x00, 0x00, 0x00, 0x00, // uint8_t background-color-rgba[4] |
// BoxRecord { |
0x00, 0x00, // int16_t top |
0x00, 0x00, // int16_t left |
0x00, 0x00, // int16_t bottom |
0x00, 0x00, // int16_t right |
// }; |
// StyleRecord { |
0x00, 0x00, // uint16_t startChar |
0x00, 0x00, // uint16_t endChar |
0x00, 0x01, // uint16_t font-ID |
0x00, // uint8_t face-style-flags |
0x12, // uint8_t font-size |
0xFF, 0xFF, 0xFF, 0xFF, // uint8_t text-color-rgba[4] |
// }; |
// FontTableBox { |
0x00, 0x00, 0x00, 0x12, // uint32_t size |
'f', 't', 'a', 'b', // uint8_t name[4] |
0x00, 0x01, // uint16_t entry-count |
// FontRecord { |
0x00, 0x01, // uint16_t font-ID |
0x05, // uint8_t font-name-length |
'S', 'e', 'r', 'i', 'f',// uint8_t font[font-name-length] |
// }; |
// }; |
}; |
|
MovTextContext *s = avctx->priv_data; |
|
avctx->extradata_size = sizeof text_sample_entry; |
avctx->extradata = av_mallocz(avctx->extradata_size); |
if (!avctx->extradata) |
return AVERROR(ENOMEM); |
|
memcpy(avctx->extradata, text_sample_entry, avctx->extradata_size); |
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s->ass_ctx = ff_ass_split(avctx->subtitle_header); |
return s->ass_ctx ? 0 : AVERROR_INVALIDDATA; |
} |
|
static void mov_text_text_cb(void *priv, const char *text, int len) |
{ |
MovTextContext *s = priv; |
av_assert0(s->end >= s->ptr); |
av_strlcpy(s->ptr, text, FFMIN(s->end - s->ptr, len + 1)); |
s->ptr += FFMIN(s->end - s->ptr, len); |
} |
|
static void mov_text_new_line_cb(void *priv, int forced) |
{ |
MovTextContext *s = priv; |
av_assert0(s->end >= s->ptr); |
av_strlcpy(s->ptr, "\n", FFMIN(s->end - s->ptr, 2)); |
if (s->end > s->ptr) |
s->ptr++; |
} |
|
static const ASSCodesCallbacks mov_text_callbacks = { |
.text = mov_text_text_cb, |
.new_line = mov_text_new_line_cb, |
}; |
|
static int mov_text_encode_frame(AVCodecContext *avctx, unsigned char *buf, |
int bufsize, const AVSubtitle *sub) |
{ |
MovTextContext *s = avctx->priv_data; |
ASSDialog *dialog; |
int i, len, num; |
|
s->ptr = s->buffer; |
s->end = s->ptr + sizeof(s->buffer); |
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for (i = 0; i < sub->num_rects; i++) { |
|
if (sub->rects[i]->type != SUBTITLE_ASS) { |
av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n"); |
return AVERROR(ENOSYS); |
} |
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dialog = ff_ass_split_dialog(s->ass_ctx, sub->rects[i]->ass, 0, &num); |
for (; dialog && num--; dialog++) { |
ff_ass_split_override_codes(&mov_text_callbacks, s, dialog->text); |
} |
} |
|
if (s->ptr == s->buffer) |
return 0; |
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AV_WB16(buf, strlen(s->buffer)); |
buf += 2; |
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len = av_strlcpy(buf, s->buffer, bufsize - 2); |
|
if (len > bufsize-3) { |
av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n"); |
return AVERROR(EINVAL); |
} |
|
return len + 2; |
} |
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static int mov_text_encode_close(AVCodecContext *avctx) |
{ |
MovTextContext *s = avctx->priv_data; |
ff_ass_split_free(s->ass_ctx); |
return 0; |
} |
|
AVCodec ff_movtext_encoder = { |
.name = "mov_text", |
.long_name = NULL_IF_CONFIG_SMALL("3GPP Timed Text subtitle"), |
.type = AVMEDIA_TYPE_SUBTITLE, |
.id = AV_CODEC_ID_MOV_TEXT, |
.priv_data_size = sizeof(MovTextContext), |
.init = mov_text_encode_init, |
.encode_sub = mov_text_encode_frame, |
.close = mov_text_encode_close, |
}; |