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https://github.com/mpv-player/mpv
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sd_lavc_conv: strip style header
Normally, libavcodec subtitle converters will output a style header like this as part of the extradata: Style: Default,Arial,16,&Hffffff,&Hffffff,&H0,&H0,0,0,0,1,1,0,2,10,10,10,0,0 We don't want that, so use some bruteforce to get rid of them.
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@ -27,6 +27,7 @@
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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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@ -55,6 +56,19 @@ static bool supports_format(const char *format)
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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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@ -76,6 +90,11 @@ static int init(struct sd *sd)
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sd->output_codec = "ass";
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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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