mirror of
https://github.com/mpv-player/mpv
synced 2024-12-25 08:12:17 +00:00
1058d80a5e
Currently, we are filtering libavformat style ASS packets by checking whether they are prefixed "Dialogue: ". Unfortunately, comment packets are demuxed too. These start with "Comment: ", so they are not caught. Change the filtering, and use the codec ID instead. libavformat uses "ssa" as codec ID for ASS subtitles, while mpv uses "ass". Also, at least FFmpeg will change the ASS packet format to the same format mpv and Matroska use, and identify these with "ass" as codec ID, so this is works out nicely.
166 lines
4.9 KiB
C
166 lines
4.9 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 "core/mp_msg.h"
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#include "core/av_common.h"
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#include "core/bstr.h"
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#include "sd.h"
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struct sd_lavc_priv {
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AVCodecContext *avctx;
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};
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static bool supports_format(const char *format)
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{
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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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#if HAVE_AV_CODEC_PROP_TEXT_SUB
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// These are documented to support AVSubtitleRect->ass.
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return desc->props & AV_CODEC_PROP_TEXT_SUB;
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#else
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const char *whitelist[] =
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{"text", "ass", "ssa", "mov_text", "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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#endif
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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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AVCodec *codec = avcodec_find_decoder(mp_codec_to_av_codec_id(sd->codec));
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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_msg(MSGT_SUBREADER, MSGL_ERR,
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"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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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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double ts = av_q2d(av_inv_q(avctx->time_base));
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AVSubtitle sub = {0};
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AVPacket pkt;
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int ret, got_sub;
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mp_set_av_packet(&pkt, packet);
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pkt.pts = packet->pts == MP_NOPTS_VALUE ? AV_NOPTS_VALUE : packet->pts * ts;
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pkt.duration = packet->duration * ts;
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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_msg(MSGT_OSD, MSGL_ERR, "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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avsubtitle_free(&sub);
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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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