mpv/sub/lavc_conv.c

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/*
* This file is part of mpv.
*
Relicense some non-MPlayer source files to LGPL 2.1 or later This covers source files which were added in mplayer2 and mpv times only, and where all code is covered by LGPL relicensing agreements. There are probably more files to which this applies, but I'm being conservative here. A file named ao_sdl.c exists in MPlayer too, but the mpv one is a complete rewrite, and was added some time after the original ao_sdl.c was removed. The same applies to vo_sdl.c, for which the SDL2 API is radically different in addition (MPlayer supports SDL 1.2 only). common.c contains only code written by me. But common.h is a strange case: although it originally was named mp_common.h and exists in MPlayer too, by now it contains only definitions written by uau and me. The exceptions are the CONTROL_ defines - thus not changing the license of common.h yet. codec_tags.c contained once large tables generated from MPlayer's codecs.conf, but all of these tables were removed. From demux_playlist.c I'm removing a code fragment from someone who was not asked; this probably could be done later (see commit 15dccc37). misc.c is a bit complicated to reason about (it was split off mplayer.c and thus contains random functions out of this file), but actually all functions have been added post-MPlayer. Except get_relative_time(), which was written by uau, but looks similar to 3 different versions of something similar in each of the Unix/win32/OSX timer source files. I'm not sure what that means in regards to copyright, so I've just moved it into another still-GPL source file for now. screenshot.c once had some minor parts of MPlayer's vf_screenshot.c, but they're all gone.
2016-01-19 17:36:06 +00:00
* mpv 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.
*
* mpv 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
Relicense some non-MPlayer source files to LGPL 2.1 or later This covers source files which were added in mplayer2 and mpv times only, and where all code is covered by LGPL relicensing agreements. There are probably more files to which this applies, but I'm being conservative here. A file named ao_sdl.c exists in MPlayer too, but the mpv one is a complete rewrite, and was added some time after the original ao_sdl.c was removed. The same applies to vo_sdl.c, for which the SDL2 API is radically different in addition (MPlayer supports SDL 1.2 only). common.c contains only code written by me. But common.h is a strange case: although it originally was named mp_common.h and exists in MPlayer too, by now it contains only definitions written by uau and me. The exceptions are the CONTROL_ defines - thus not changing the license of common.h yet. codec_tags.c contained once large tables generated from MPlayer's codecs.conf, but all of these tables were removed. From demux_playlist.c I'm removing a code fragment from someone who was not asked; this probably could be done later (see commit 15dccc37). misc.c is a bit complicated to reason about (it was split off mplayer.c and thus contains random functions out of this file), but actually all functions have been added post-MPlayer. Except get_relative_time(), which was written by uau, but looks similar to 3 different versions of something similar in each of the Unix/win32/OSX timer source files. I'm not sure what that means in regards to copyright, so I've just moved it into another still-GPL source file for now. screenshot.c once had some minor parts of MPlayer's vf_screenshot.c, but they're all gone.
2016-01-19 17:36:06 +00:00
* GNU Lesser General Public License for more details.
*
Relicense some non-MPlayer source files to LGPL 2.1 or later This covers source files which were added in mplayer2 and mpv times only, and where all code is covered by LGPL relicensing agreements. There are probably more files to which this applies, but I'm being conservative here. A file named ao_sdl.c exists in MPlayer too, but the mpv one is a complete rewrite, and was added some time after the original ao_sdl.c was removed. The same applies to vo_sdl.c, for which the SDL2 API is radically different in addition (MPlayer supports SDL 1.2 only). common.c contains only code written by me. But common.h is a strange case: although it originally was named mp_common.h and exists in MPlayer too, by now it contains only definitions written by uau and me. The exceptions are the CONTROL_ defines - thus not changing the license of common.h yet. codec_tags.c contained once large tables generated from MPlayer's codecs.conf, but all of these tables were removed. From demux_playlist.c I'm removing a code fragment from someone who was not asked; this probably could be done later (see commit 15dccc37). misc.c is a bit complicated to reason about (it was split off mplayer.c and thus contains random functions out of this file), but actually all functions have been added post-MPlayer. Except get_relative_time(), which was written by uau, but looks similar to 3 different versions of something similar in each of the Unix/win32/OSX timer source files. I'm not sure what that means in regards to copyright, so I've just moved it into another still-GPL source file for now. screenshot.c once had some minor parts of MPlayer's vf_screenshot.c, but they're all gone.
2016-01-19 17:36:06 +00:00
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <assert.h>
#include <libavcodec/avcodec.h>
#include <libavutil/intreadwrite.h>
#include <libavutil/common.h>
#include <libavutil/opt.h>
#include "config.h"
#include "mpv_talloc.h"
#include "common/msg.h"
#include "common/av_common.h"
#include "misc/bstr.h"
#include "sd.h"
#define HAVE_AV_WEBVTT (LIBAVCODEC_VERSION_MICRO >= 100)
struct lavc_conv {
struct mp_log *log;
AVCodecContext *avctx;
char *codec;
char *extradata;
AVSubtitle cur;
char **cur_list;
};
static const char *get_lavc_format(const char *format)
{
// For the hack involving parse_webvtt().
if (format && strcmp(format, "webvtt-webm") == 0)
format = "webvtt";
// Most text subtitles are srt/html style anyway.
if (format && strcmp(format, "text") == 0)
format = "subrip";
return format;
}
// Disable style definitions generated by the libavcodec converter.
// We always want the user defined style instead.
static void disable_styles(bstr header)
{
bstr style = bstr0("\nStyle: ");
while (header.len) {
int n = bstr_find(header, style);
if (n < 0)
break;
header.start[n + 1] = '#'; // turn into a comment
header = bstr_cut(header, n + style.len);
}
}
struct lavc_conv *lavc_conv_create(struct mp_log *log, const char *codec_name,
char *extradata, int extradata_len)
{
struct lavc_conv *priv = talloc_zero(NULL, struct lavc_conv);
priv->log = log;
priv->cur_list = talloc_array(priv, char*, 0);
priv->codec = talloc_strdup(priv, codec_name);
AVCodecContext *avctx = NULL;
AVDictionary *opts = NULL;
const char *fmt = get_lavc_format(priv->codec);
AVCodec *codec = avcodec_find_decoder(mp_codec_to_av_codec_id(fmt));
if (!codec)
goto error;
avctx = avcodec_alloc_context3(codec);
if (!avctx)
goto error;
if (mp_lavc_set_extradata(avctx, extradata, extradata_len) < 0)
goto error;
if (strcmp(codec_name, "eia_608") == 0)
av_dict_set(&opts, "real_time", "1", 0);
if (avcodec_open2(avctx, codec, &opts) < 0)
goto error;
av_dict_free(&opts);
// Documented as "set by libavcodec", but there is no other way
avctx->time_base = (AVRational) {1, 1000};
#if LIBAVCODEC_VERSION_MICRO >= 100
avctx->pkt_timebase = avctx->time_base;
avctx->sub_charenc_mode = FF_SUB_CHARENC_MODE_IGNORE;
#endif
priv->avctx = avctx;
priv->extradata = talloc_strndup(priv, avctx->subtitle_header,
avctx->subtitle_header_size);
disable_styles(bstr0(priv->extradata));
return priv;
error:
MP_FATAL(priv, "Could not open libavcodec subtitle converter\n");
av_dict_free(&opts);
av_free(avctx);
talloc_free(priv);
return NULL;
}
char *lavc_conv_get_extradata(struct lavc_conv *priv)
{
return priv->extradata;
}
#if HAVE_AV_WEBVTT
// FFmpeg WebVTT packets are pre-parsed in some way. The FFmpeg Matroska
// demuxer does this on its own. In order to free our demuxer_mkv.c from
// codec-specific crud, we do this here.
// Copied from libavformat/matroskadec.c (FFmpeg 818ebe9 / 2013-08-19)
// License: LGPL v2.1 or later
// Author header: The FFmpeg Project
// Modified in some ways.
static int parse_webvtt(AVPacket *in, AVPacket *pkt)
{
uint8_t *id, *settings, *text, *buf;
int id_len, settings_len, text_len;
uint8_t *p, *q;
int err;
uint8_t *data = in->data;
int data_len = in->size;
if (data_len <= 0)
return AVERROR_INVALIDDATA;
p = data;
q = data + data_len;
id = p;
id_len = -1;
while (p < q) {
if (*p == '\r' || *p == '\n') {
id_len = p - id;
if (*p == '\r')
p++;
break;
}
p++;
}
if (p >= q || *p != '\n')
return AVERROR_INVALIDDATA;
p++;
settings = p;
settings_len = -1;
while (p < q) {
if (*p == '\r' || *p == '\n') {
settings_len = p - settings;
if (*p == '\r')
p++;
break;
}
p++;
}
if (p >= q || *p != '\n')
return AVERROR_INVALIDDATA;
p++;
text = p;
text_len = q - p;
while (text_len > 0) {
const int len = text_len - 1;
const uint8_t c = p[len];
if (c != '\r' && c != '\n')
break;
text_len = len;
}
if (text_len <= 0)
return AVERROR_INVALIDDATA;
err = av_new_packet(pkt, text_len);
if (err < 0)
return AVERROR(err);
memcpy(pkt->data, text, text_len);
if (id_len > 0) {
buf = av_packet_new_side_data(pkt,
AV_PKT_DATA_WEBVTT_IDENTIFIER,
id_len);
if (buf == NULL) {
av_packet_unref(pkt);
return AVERROR(ENOMEM);
}
memcpy(buf, id, id_len);
}
if (settings_len > 0) {
buf = av_packet_new_side_data(pkt,
AV_PKT_DATA_WEBVTT_SETTINGS,
settings_len);
if (buf == NULL) {
av_packet_unref(pkt);
return AVERROR(ENOMEM);
}
memcpy(buf, settings, settings_len);
}
pkt->pts = in->pts;
pkt->duration = in->duration;
return 0;
}
#else
static int parse_webvtt(AVPacket *in, AVPacket *pkt)
{
return -1;
}
#endif
// Return a NULL-terminated list of ASS event lines.
char **lavc_conv_decode(struct lavc_conv *priv, struct demux_packet *packet)
{
AVCodecContext *avctx = priv->avctx;
AVPacket pkt;
AVPacket parsed_pkt = {0};
int ret, got_sub;
int num_cur = 0;
avsubtitle_free(&priv->cur);
mp_set_av_packet(&pkt, packet, &avctx->time_base);
if (pkt.pts < 0)
pkt.pts = 0;
if (strcmp(priv->codec, "webvtt-webm") == 0) {
if (parse_webvtt(&pkt, &parsed_pkt) < 0) {
MP_ERR(priv, "Error parsing subtitle\n");
goto done;
}
pkt = parsed_pkt;
}
ret = avcodec_decode_subtitle2(avctx, &priv->cur, &got_sub, &pkt);
if (ret < 0) {
MP_ERR(priv, "Error decoding subtitle\n");
} else if (got_sub) {
for (int i = 0; i < priv->cur.num_rects; i++) {
if (priv->cur.rects[i]->w > 0 && priv->cur.rects[i]->h > 0)
MP_WARN(priv, "Ignoring bitmap subtitle.\n");
char *ass_line = priv->cur.rects[i]->ass;
if (!ass_line)
continue;
MP_TARRAY_APPEND(priv, priv->cur_list, num_cur, ass_line);
}
}
done:
av_packet_unref(&parsed_pkt);
MP_TARRAY_APPEND(priv, priv->cur_list, num_cur, NULL);
return priv->cur_list;
}
void lavc_conv_reset(struct lavc_conv *priv)
{
avcodec_flush_buffers(priv->avctx);
}
void lavc_conv_uninit(struct lavc_conv *priv)
{
avsubtitle_free(&priv->cur);
avcodec_free_context(&priv->avctx);
talloc_free(priv);
}