[deb_ffmpeg.git] / ffmpeg / libavcodec / srtenc.c

/*
 * SubRip subtitle encoder
 * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.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/bprint.h"
#include "ass_split.h"
#include "ass.h"


#define SRT_STACK_SIZE 64

typedef struct {
    AVCodecContext *avctx;
    ASSSplitContext *ass_ctx;
    AVBPrint buffer;
    char stack[SRT_STACK_SIZE];
    int stack_ptr;
    int alignment_applied;
} SRTContext;


#ifdef __GNUC__
__attribute__ ((__format__ (__printf__, 2, 3)))
#endif
static void srt_print(SRTContext *s, const char *str, ...)
{
    va_list vargs;
    va_start(vargs, str);
    av_vbprintf(&s->buffer, str, vargs);
    va_end(vargs);
}

static int srt_stack_push(SRTContext *s, const char c)
{
    if (s->stack_ptr >= SRT_STACK_SIZE)
        return -1;
    s->stack[s->stack_ptr++] = c;
    return 0;
}

static char srt_stack_pop(SRTContext *s)
{
    if (s->stack_ptr <= 0)
        return 0;
    return s->stack[--s->stack_ptr];
}

static int srt_stack_find(SRTContext *s, const char c)
{
    int i;
    for (i = s->stack_ptr-1; i >= 0; i--)
        if (s->stack[i] == c)
            break;
    return i;
}

static void srt_close_tag(SRTContext *s, char tag)
{
    srt_print(s, "</%c%s>", tag, tag == 'f' ? "ont" : "");
}

static void srt_stack_push_pop(SRTContext *s, const char c, int close)
{
    if (close) {
        int i = c ? srt_stack_find(s, c) : 0;
        if (i < 0)
            return;
        while (s->stack_ptr != i)
            srt_close_tag(s, srt_stack_pop(s));
    } else if (srt_stack_push(s, c) < 0)
        av_log(s->avctx, AV_LOG_ERROR, "tag stack overflow\n");
}

static void srt_style_apply(SRTContext *s, const char *style)
{
    ASSStyle *st = ff_ass_style_get(s->ass_ctx, style);
    if (st) {
        int c = st->primary_color & 0xFFFFFF;
        if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT) ||
            st->font_size != ASS_DEFAULT_FONT_SIZE ||
            c != ASS_DEFAULT_COLOR) {
            srt_print(s, "<font");
            if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT))
                srt_print(s, " face=\"%s\"", st->font_name);
            if (st->font_size != ASS_DEFAULT_FONT_SIZE)
                srt_print(s, " size=\"%d\"", st->font_size);
            if (c != ASS_DEFAULT_COLOR)
                srt_print(s, " color=\"#%06x\"",
                          (c & 0xFF0000) >> 16 | c & 0xFF00 | (c & 0xFF) << 16);
            srt_print(s, ">");
            srt_stack_push(s, 'f');
        }
        if (st->bold != ASS_DEFAULT_BOLD) {
            srt_print(s, "<b>");
            srt_stack_push(s, 'b');
        }
        if (st->italic != ASS_DEFAULT_ITALIC) {
            srt_print(s, "<i>");
            srt_stack_push(s, 'i');
        }
        if (st->underline != ASS_DEFAULT_UNDERLINE) {
            srt_print(s, "<u>");
            srt_stack_push(s, 'u');
        }
        if (st->alignment != ASS_DEFAULT_ALIGNMENT) {
            srt_print(s, "{\\an%d}", st->alignment);
            s->alignment_applied = 1;
        }
    }
}


static av_cold int srt_encode_init(AVCodecContext *avctx)
{
    SRTContext *s = avctx->priv_data;
    s->avctx = avctx;
    s->ass_ctx = ff_ass_split(avctx->subtitle_header);
    av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
    return s->ass_ctx ? 0 : AVERROR_INVALIDDATA;
}

static void srt_text_cb(void *priv, const char *text, int len)
{
    SRTContext *s = priv;
    av_bprint_append_data(&s->buffer, text, len);
}

static void srt_new_line_cb(void *priv, int forced)
{
    srt_print(priv, "\r\n");
}

static void srt_style_cb(void *priv, char style, int close)
{
    srt_stack_push_pop(priv, style, close);
    if (!close)
        srt_print(priv, "<%c>", style);
}

static void srt_color_cb(void *priv, unsigned int color, unsigned int color_id)
{
    if (color_id > 1)
        return;
    srt_stack_push_pop(priv, 'f', color == 0xFFFFFFFF);
    if (color != 0xFFFFFFFF)
        srt_print(priv, "<font color=\"#%06x\">",
              (color & 0xFF0000) >> 16 | color & 0xFF00 | (color & 0xFF) << 16);
}

static void srt_font_name_cb(void *priv, const char *name)
{
    srt_stack_push_pop(priv, 'f', !name);
    if (name)
        srt_print(priv, "<font face=\"%s\">", name);
}

static void srt_font_size_cb(void *priv, int size)
{
    srt_stack_push_pop(priv, 'f', size < 0);
    if (size >= 0)
        srt_print(priv, "<font size=\"%d\">", size);
}

static void srt_alignment_cb(void *priv, int alignment)
{
    SRTContext *s = priv;
    if (!s->alignment_applied && alignment >= 0) {
        srt_print(s, "{\\an%d}", alignment);
        s->alignment_applied = 1;
    }
}

static void srt_cancel_overrides_cb(void *priv, const char *style)
{
    srt_stack_push_pop(priv, 0, 1);
    srt_style_apply(priv, style);
}

static void srt_move_cb(void *priv, int x1, int y1, int x2, int y2,
                        int t1, int t2)
{
    // TODO: add a AV_PKT_DATA_SUBTITLE_POSITION side data when a new subtitles
    // encoding API passing the AVPacket is available.
}

static void srt_end_cb(void *priv)
{
    srt_stack_push_pop(priv, 0, 1);
}

static const ASSCodesCallbacks srt_callbacks = {
    .text             = srt_text_cb,
    .new_line         = srt_new_line_cb,
    .style            = srt_style_cb,
    .color            = srt_color_cb,
    .font_name        = srt_font_name_cb,
    .font_size        = srt_font_size_cb,
    .alignment        = srt_alignment_cb,
    .cancel_overrides = srt_cancel_overrides_cb,
    .move             = srt_move_cb,
    .end              = srt_end_cb,
};

static int srt_encode_frame(AVCodecContext *avctx,
                            unsigned char *buf, int bufsize, const AVSubtitle *sub)
{
    SRTContext *s = avctx->priv_data;
    ASSDialog *dialog;
    int i, num;

    av_bprint_clear(&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++) {
            s->alignment_applied = 0;
            srt_style_apply(s, dialog->style);
            ff_ass_split_override_codes(&srt_callbacks, s, dialog->text);
        }
    }

    if (!av_bprint_is_complete(&s->buffer))
        return AVERROR(ENOMEM);
    if (!s->buffer.len)
        return 0;

    if (s->buffer.len > bufsize) {
        av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
        return -1;
    }
    memcpy(buf, s->buffer.str, s->buffer.len);

    return s->buffer.len;
}

static int srt_encode_close(AVCodecContext *avctx)
{
    SRTContext *s = avctx->priv_data;
    ff_ass_split_free(s->ass_ctx);
    av_bprint_finalize(&s->buffer, NULL);
    return 0;
}

#if CONFIG_SRT_ENCODER
/* deprecated encoder */
AVCodec ff_srt_encoder = {
    .name           = "srt",
    .long_name      = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
    .type           = AVMEDIA_TYPE_SUBTITLE,
    .id             = AV_CODEC_ID_SUBRIP,
    .priv_data_size = sizeof(SRTContext),
    .init           = srt_encode_init,
    .encode_sub     = srt_encode_frame,
    .close          = srt_encode_close,
};
#endif

#if CONFIG_SUBRIP_ENCODER
AVCodec ff_subrip_encoder = {
    .name           = "subrip",
    .long_name      = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
    .type           = AVMEDIA_TYPE_SUBTITLE,
    .id             = AV_CODEC_ID_SUBRIP,
    .priv_data_size = sizeof(SRTContext),
    .init           = srt_encode_init,
    .encode_sub     = srt_encode_frame,
    .close          = srt_encode_close,
};
#endif
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* SubRip subtitle encoder
	3	* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#include <stdarg.h>
	23	#include "avcodec.h"
	24	#include "libavutil/avstring.h"
	25	#include "libavutil/bprint.h"
	26	#include "ass_split.h"
	27	#include "ass.h"
	28
	29
	30	#define SRT_STACK_SIZE 64
	31
	32	typedef struct {
	33	AVCodecContext *avctx;
	34	ASSSplitContext *ass_ctx;
	35	AVBPrint buffer;
2ba45a60 DM	36	char stack[SRT_STACK_SIZE];
	37	int stack_ptr;
	38	int alignment_applied;
	39	} SRTContext;
	40
	41
	42	#ifdef __GNUC__
	43	__attribute__ ((__format__ (__printf__, 2, 3)))
	44	#endif
	45	static void srt_print(SRTContext s, const char str, ...)
	46	{
	47	va_list vargs;
	48	va_start(vargs, str);
	49	av_vbprintf(&s->buffer, str, vargs);
	50	va_end(vargs);
	51	}
	52
	53	static int srt_stack_push(SRTContext *s, const char c)
	54	{
	55	if (s->stack_ptr >= SRT_STACK_SIZE)
	56	return -1;
	57	s->stack[s->stack_ptr++] = c;
	58	return 0;
	59	}
	60
	61	static char srt_stack_pop(SRTContext *s)
	62	{
	63	if (s->stack_ptr <= 0)
	64	return 0;
	65	return s->stack[--s->stack_ptr];
	66	}
	67
	68	static int srt_stack_find(SRTContext *s, const char c)
	69	{
	70	int i;
	71	for (i = s->stack_ptr-1; i >= 0; i--)
	72	if (s->stack[i] == c)
	73	break;
	74	return i;
	75	}
	76
	77	static void srt_close_tag(SRTContext *s, char tag)
	78	{
	79	srt_print(s, "</%c%s>", tag, tag == 'f' ? "ont" : "");
	80	}
	81
	82	static void srt_stack_push_pop(SRTContext *s, const char c, int close)
	83	{
	84	if (close) {
	85	int i = c ? srt_stack_find(s, c) : 0;
	86	if (i < 0)
	87	return;
	88	while (s->stack_ptr != i)
	89	srt_close_tag(s, srt_stack_pop(s));
	90	} else if (srt_stack_push(s, c) < 0)
	91	av_log(s->avctx, AV_LOG_ERROR, "tag stack overflow\n");
	92	}
	93
	94	static void srt_style_apply(SRTContext s, const char style)
	95	{
	96	ASSStyle *st = ff_ass_style_get(s->ass_ctx, style);
	97	if (st) {
	98	int c = st->primary_color & 0xFFFFFF;
	99	if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT) \|\|
100	st->font_size != ASS_DEFAULT_FONT_SIZE \|\|
101	c != ASS_DEFAULT_COLOR) {
102	srt_print(s, "<font");
103	if (st->font_name && strcmp(st->font_name, ASS_DEFAULT_FONT))
104	srt_print(s, " face=\"%s\"", st->font_name);
105	if (st->font_size != ASS_DEFAULT_FONT_SIZE)
106	srt_print(s, " size=\"%d\"", st->font_size);
107	if (c != ASS_DEFAULT_COLOR)
108	srt_print(s, " color=\"#%06x\"",
109	(c & 0xFF0000) >> 16 \| c & 0xFF00 \| (c & 0xFF) << 16);
110	srt_print(s, ">");
111	srt_stack_push(s, 'f');
112	}
113	if (st->bold != ASS_DEFAULT_BOLD) {
114	srt_print(s, "<b>");
115	srt_stack_push(s, 'b');
116	}
117	if (st->italic != ASS_DEFAULT_ITALIC) {
118	srt_print(s, "<i>");
119	srt_stack_push(s, 'i');
120	}
121	if (st->underline != ASS_DEFAULT_UNDERLINE) {
122	srt_print(s, "<u>");
123	srt_stack_push(s, 'u');
124	}
125	if (st->alignment != ASS_DEFAULT_ALIGNMENT) {
126	srt_print(s, "{\\an%d}", st->alignment);
127	s->alignment_applied = 1;
128	}
129	}
130	}
131
132
133	static av_cold int srt_encode_init(AVCodecContext *avctx)
134	{
135	SRTContext *s = avctx->priv_data;
136	s->avctx = avctx;
137	s->ass_ctx = ff_ass_split(avctx->subtitle_header);
138	av_bprint_init(&s->buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
139	return s->ass_ctx ? 0 : AVERROR_INVALIDDATA;
140	}
141
142	static void srt_text_cb(void priv, const char text, int len)
143	{
144	SRTContext *s = priv;
145	av_bprint_append_data(&s->buffer, text, len);
146	}
147
148	static void srt_new_line_cb(void *priv, int forced)
149	{
150	srt_print(priv, "\r\n");
151	}
152
153	static void srt_style_cb(void *priv, char style, int close)
154	{
155	srt_stack_push_pop(priv, style, close);
156	if (!close)
157	srt_print(priv, "<%c>", style);
158	}
159
160	static void srt_color_cb(void *priv, unsigned int color, unsigned int color_id)
161	{
162	if (color_id > 1)
163	return;
164	srt_stack_push_pop(priv, 'f', color == 0xFFFFFFFF);
165	if (color != 0xFFFFFFFF)
166	srt_print(priv, "<font color=\"#%06x\">",
167	(color & 0xFF0000) >> 16 \| color & 0xFF00 \| (color & 0xFF) << 16);
168	}
169
170	static void srt_font_name_cb(void priv, const char name)
171	{
172	srt_stack_push_pop(priv, 'f', !name);
173	if (name)
174	srt_print(priv, "<font face=\"%s\">", name);
175	}
176
177	static void srt_font_size_cb(void *priv, int size)
178	{
179	srt_stack_push_pop(priv, 'f', size < 0);
180	if (size >= 0)
181	srt_print(priv, "<font size=\"%d\">", size);
182	}
183
184	static void srt_alignment_cb(void *priv, int alignment)
185	{
186	SRTContext *s = priv;
187	if (!s->alignment_applied && alignment >= 0) {
188	srt_print(s, "{\\an%d}", alignment);
189	s->alignment_applied = 1;
190	}
191	}
192
193	static void srt_cancel_overrides_cb(void priv, const char style)
194	{
195	srt_stack_push_pop(priv, 0, 1);
196	srt_style_apply(priv, style);
197	}
198
199	static void srt_move_cb(void *priv, int x1, int y1, int x2, int y2,
200	int t1, int t2)
201	{
f6fa7814 DM	202	// TODO: add a AV_PKT_DATA_SUBTITLE_POSITION side data when a new subtitles
f6fa7814 DM	203	// encoding API passing the AVPacket is available.
2ba45a60 DM	204	}
	205
	206	static void srt_end_cb(void *priv)
	207	{
2ba45a60	208	srt_stack_push_pop(priv, 0, 1);
2ba45a60 DM	209	}
	210
	211	static const ASSCodesCallbacks srt_callbacks = {
	212	.text = srt_text_cb,
	213	.new_line = srt_new_line_cb,
	214	.style = srt_style_cb,
	215	.color = srt_color_cb,
	216	.font_name = srt_font_name_cb,
	217	.font_size = srt_font_size_cb,
	218	.alignment = srt_alignment_cb,
	219	.cancel_overrides = srt_cancel_overrides_cb,
	220	.move = srt_move_cb,
	221	.end = srt_end_cb,
	222	};
	223
	224	static int srt_encode_frame(AVCodecContext *avctx,
	225	unsigned char buf, int bufsize, const AVSubtitle sub)
	226	{
	227	SRTContext *s = avctx->priv_data;
	228	ASSDialog *dialog;
	229	int i, num;
	230
	231	av_bprint_clear(&s->buffer);
	232
	233	for (i=0; i<sub->num_rects; i++) {
	234
	235	if (sub->rects[i]->type != SUBTITLE_ASS) {
	236	av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
	237	return AVERROR(ENOSYS);
	238	}
	239
	240	dialog = ff_ass_split_dialog(s->ass_ctx, sub->rects[i]->ass, 0, &num);
	241	for (; dialog && num--; dialog++) {
2ba45a60 DM	242	s->alignment_applied = 0;
	243	srt_style_apply(s, dialog->style);
	244	ff_ass_split_override_codes(&srt_callbacks, s, dialog->text);
	245	}
	246	}
	247
	248	if (!av_bprint_is_complete(&s->buffer))
	249	return AVERROR(ENOMEM);
	250	if (!s->buffer.len)
	251	return 0;
	252
	253	if (s->buffer.len > bufsize) {
	254	av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
	255	return -1;
	256	}
	257	memcpy(buf, s->buffer.str, s->buffer.len);
	258
	259	return s->buffer.len;
	260	}
	261
	262	static int srt_encode_close(AVCodecContext *avctx)
	263	{
	264	SRTContext *s = avctx->priv_data;
	265	ff_ass_split_free(s->ass_ctx);
	266	av_bprint_finalize(&s->buffer, NULL);
	267	return 0;
	268	}
	269
	270	#if CONFIG_SRT_ENCODER
	271	/* deprecated encoder */
	272	AVCodec ff_srt_encoder = {
	273	.name = "srt",
f6fa7814	274	.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
2ba45a60	275	.type = AVMEDIA_TYPE_SUBTITLE,
f6fa7814	276	.id = AV_CODEC_ID_SUBRIP,
2ba45a60 DM	277	.priv_data_size = sizeof(SRTContext),
	278	.init = srt_encode_init,
	279	.encode_sub = srt_encode_frame,
	280	.close = srt_encode_close,
	281	};
	282	#endif
	283
	284	#if CONFIG_SUBRIP_ENCODER
	285	AVCodec ff_subrip_encoder = {
	286	.name = "subrip",
	287	.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
	288	.type = AVMEDIA_TYPE_SUBTITLE,
	289	.id = AV_CODEC_ID_SUBRIP,
	290	.priv_data_size = sizeof(SRTContext),
	291	.init = srt_encode_init,
	292	.encode_sub = srt_encode_frame,
	293	.close = srt_encode_close,
	294	};
	295	#endif