| /* |
| * 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/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; |
| |
| |
| 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); |
| |
| 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_strlcpy(s->ptr, text, FFMIN(s->end - s->ptr, len + 1)); |
| s->ptr += len; |
| } |
| |
| static void mov_text_new_line_cb(void *priv, int forced) |
| { |
| MovTextContext *s = priv; |
| av_strlcpy(s->ptr, "\n", FFMIN(s->end - s->ptr, 2)); |
| 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); |
| |
| 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); |
| } |
| |
| 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; |
| |
| AV_WB16(buf, strlen(s->buffer)); |
| buf += 2; |
| |
| 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; |
| } |
| |
| 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, |
| }; |