mirror of
https://github.com/mpv-player/mpv
synced 2024-12-19 13:21:13 +00:00
298 lines
7.8 KiB
C
298 lines
7.8 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <assert.h>
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#include <libavcodec/avcodec.h>
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#include <libavutil/intreadwrite.h>
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#include <libavutil/common.h>
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#include "config.h"
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#include "talloc.h"
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#include "common/msg.h"
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#include "common/av_common.h"
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#include "bstr/bstr.h"
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#include "sd.h"
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#if LIBAVCODEC_VERSION_MICRO >= 100
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#define HAVE_AV_WEBVTT (LIBAVCODEC_VERSION_INT >= AV_VERSION_INT(55, 13, 100))
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#else
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#define HAVE_AV_WEBVTT 0
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#endif
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struct sd_lavc_priv {
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AVCodecContext *avctx;
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};
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static const char *get_lavc_format(const char *format)
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{
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// For the hack involving parse_webvtt().
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if (format && strcmp(format, "webvtt-webm") == 0)
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format = "webvtt";
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return format;
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}
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static bool supports_format(const char *format)
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{
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format = get_lavc_format(format);
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enum AVCodecID cid = mp_codec_to_av_codec_id(format);
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const AVCodecDescriptor *desc = avcodec_descriptor_get(cid);
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if (!desc)
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return false;
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// These are known to support AVSubtitleRect->ass.
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const char *whitelist[] =
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{"text", "ass", "ssa", "srt", "subrip", "microdvd", "mpl2",
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"jacosub", "pjs", "sami", "realtext", "subviewer", "subviewer1",
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"vplayer", "webvtt", 0};
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for (int n = 0; whitelist[n]; n++) {
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if (strcmp(format, whitelist[n]) == 0)
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return true;
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}
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return false;
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}
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// Disable style definitions generated by the libavcodec converter.
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// We always want the user defined style instead.
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static void disable_styles(bstr header)
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{
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while (header.len) {
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int n = bstr_find(header, bstr0("\nStyle: "));
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if (n < 0)
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break;
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header.start[n + 1] = '#'; // turn into a comment
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header = bstr_cut(header, 2);
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}
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}
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static int init(struct sd *sd)
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{
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struct sd_lavc_priv *priv = talloc_zero(NULL, struct sd_lavc_priv);
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AVCodecContext *avctx = NULL;
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const char *fmt = get_lavc_format(sd->codec);
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AVCodec *codec = avcodec_find_decoder(mp_codec_to_av_codec_id(fmt));
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if (!codec)
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goto error;
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avctx = avcodec_alloc_context3(codec);
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if (!avctx)
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goto error;
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avctx->extradata_size = sd->extradata_len;
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avctx->extradata = sd->extradata;
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if (avcodec_open2(avctx, codec, NULL) < 0)
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goto error;
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// Documented as "set by libavcodec", but there is no other way
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avctx->time_base = (AVRational) {1, 1000};
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priv->avctx = avctx;
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sd->priv = priv;
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sd->output_codec = "ssa";
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sd->output_extradata = avctx->subtitle_header;
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sd->output_extradata_len = avctx->subtitle_header_size;
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if (sd->output_extradata) {
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sd->output_extradata = talloc_memdup(sd, sd->output_extradata,
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sd->output_extradata_len);
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disable_styles((bstr){sd->output_extradata, sd->output_extradata_len});
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}
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return 0;
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error:
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MP_FATAL(sd, "Could not open libavcodec subtitle converter\n");
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av_free(avctx);
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talloc_free(priv);
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return -1;
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}
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#if HAVE_AV_WEBVTT
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// FFmpeg WebVTT packets are pre-parsed in some way. The FFmpeg Matroska
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// demuxer does this on its own. In order to free our demuxer_mkv.c from
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// codec-specific crud, we do this here.
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// Copied from libavformat/matroskadec.c (FFmpeg 818ebe9 / 2013-08-19)
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// License: LGPL v2.1 or later
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// Author header: The FFmpeg Project
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// Modified in some ways.
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static int parse_webvtt(AVPacket *in, AVPacket *pkt)
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{
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uint8_t *id, *settings, *text, *buf;
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int id_len, settings_len, text_len;
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uint8_t *p, *q;
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int err;
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uint8_t *data = in->data;
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int data_len = in->size;
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if (data_len <= 0)
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return AVERROR_INVALIDDATA;
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p = data;
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q = data + data_len;
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id = p;
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id_len = -1;
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while (p < q) {
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if (*p == '\r' || *p == '\n') {
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id_len = p - id;
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if (*p == '\r')
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p++;
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break;
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}
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p++;
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}
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if (p >= q || *p != '\n')
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return AVERROR_INVALIDDATA;
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p++;
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settings = p;
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settings_len = -1;
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while (p < q) {
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if (*p == '\r' || *p == '\n') {
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settings_len = p - settings;
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if (*p == '\r')
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p++;
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break;
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}
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p++;
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}
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if (p >= q || *p != '\n')
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return AVERROR_INVALIDDATA;
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p++;
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text = p;
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text_len = q - p;
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while (text_len > 0) {
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const int len = text_len - 1;
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const uint8_t c = p[len];
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if (c != '\r' && c != '\n')
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break;
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text_len = len;
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}
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if (text_len <= 0)
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return AVERROR_INVALIDDATA;
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err = av_new_packet(pkt, text_len);
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if (err < 0)
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return AVERROR(err);
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memcpy(pkt->data, text, text_len);
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if (id_len > 0) {
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buf = av_packet_new_side_data(pkt,
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AV_PKT_DATA_WEBVTT_IDENTIFIER,
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id_len);
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if (buf == NULL) {
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av_free_packet(pkt);
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return AVERROR(ENOMEM);
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}
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memcpy(buf, id, id_len);
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}
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if (settings_len > 0) {
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buf = av_packet_new_side_data(pkt,
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AV_PKT_DATA_WEBVTT_SETTINGS,
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settings_len);
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if (buf == NULL) {
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av_free_packet(pkt);
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return AVERROR(ENOMEM);
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}
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memcpy(buf, settings, settings_len);
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}
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pkt->pts = in->pts;
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pkt->duration = in->duration;
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pkt->convergence_duration = in->convergence_duration;
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return 0;
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}
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#else
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static int parse_webvtt(AVPacket *in, AVPacket *pkt)
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{
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return -1;
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}
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#endif
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static void decode(struct sd *sd, struct demux_packet *packet)
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{
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struct sd_lavc_priv *priv = sd->priv;
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AVCodecContext *avctx = priv->avctx;
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AVSubtitle sub = {0};
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AVPacket pkt;
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AVPacket parsed_pkt = {0};
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int ret, got_sub;
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mp_set_av_packet(&pkt, packet, &avctx->time_base);
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if (sd->codec && strcmp(sd->codec, "webvtt-webm") == 0) {
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if (parse_webvtt(&pkt, &parsed_pkt) < 0) {
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MP_ERR(sd, "Error parsing subtitle\n");
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goto done;
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}
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pkt = parsed_pkt;
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}
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ret = avcodec_decode_subtitle2(avctx, &sub, &got_sub, &pkt);
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if (ret < 0) {
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MP_ERR(sd, "Error decoding subtitle\n");
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} else if (got_sub) {
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for (int i = 0; i < sub.num_rects; i++) {
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char *ass_line = sub.rects[i]->ass;
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if (!ass_line)
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break;
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// This might contain embedded timestamps, using the "old" ffmpeg
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// ASS packet format, in which case pts/duration might be ignored
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// at a later point.
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sd_conv_add_packet(sd, ass_line, strlen(ass_line),
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packet->pts, packet->duration);
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}
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}
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done:
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avsubtitle_free(&sub);
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av_free_packet(&parsed_pkt);
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}
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static void reset(struct sd *sd)
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{
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struct sd_lavc_priv *priv = sd->priv;
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avcodec_flush_buffers(priv->avctx);
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sd_conv_def_reset(sd);
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}
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static void uninit(struct sd *sd)
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{
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struct sd_lavc_priv *priv = sd->priv;
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avcodec_close(priv->avctx);
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av_free(priv->avctx);
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talloc_free(priv);
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}
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const struct sd_functions sd_lavc_conv = {
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.name = "lavc_conv",
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.supports_format = supports_format,
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.init = init,
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.decode = decode,
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.get_converted = sd_conv_def_get_converted,
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.reset = reset,
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.uninit = uninit,
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};
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