channel.c: Fix segfault with Monitor(wav,file,i)
If the Monitor is started with the i option the read_stream will be NULL. One code path in channel.c checks if write_stream is set but than uses read_stream instead causing a segfault. ASTERISK-28249 Change-Id: I1bae9126537be54895c7fea2d08dd9488d8cc525
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@ -5225,7 +5225,7 @@ int ast_write_stream(struct ast_channel *chan, int stream_num, struct ast_frame
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if (jump >= 0) {
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jump = calc_monitor_jump((ast_channel_insmpl(chan) - ast_channel_outsmpl(chan)),
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ast_format_get_sample_rate(f->subclass.format),
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ast_format_get_sample_rate(ast_channel_monitor(chan)->read_stream->fmt->format));
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ast_format_get_sample_rate(ast_channel_monitor(chan)->write_stream->fmt->format));
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if (ast_seekstream(ast_channel_monitor(chan)->write_stream, jump, SEEK_FORCECUR) == -1) {
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ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");
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}
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@ -5236,7 +5236,7 @@ int ast_write_stream(struct ast_channel *chan, int stream_num, struct ast_frame
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#else
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int jump = calc_monitor_jump((ast_channel_insmpl(chan) - ast_channel_outsmpl(chan)),
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ast_format_get_sample_rate(f->subclass.format),
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ast_format_get_sample_rate(ast_channel_monitor(chan)->read_stream->fmt->format));
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ast_format_get_sample_rate(ast_channel_monitor(chan)->write_stream->fmt->format));
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if (jump - MONITOR_DELAY >= 0) {
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if (ast_seekstream(ast_channel_monitor(chan)->write_stream, jump - cur->samples, SEEK_FORCECUR) == -1) {
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ast_log(LOG_WARNING, "Failed to perform seek in monitoring write stream, synchronization between the files may be broken\n");
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