[FFmpeg-devel] [PATCH 2/4] avformat/mpegenc - log error messages for unsupported LPCM streams

[Gyan Doshi]

Forgot to attach patch.

Changes to MPEG-PS muxer factored as requested in
http://www.ffmpeg.org/pipermail/ffmpeg-devel/2018-January/224642.html.
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From 344bd0981693a345aebb907d825cb3eb5f93b402 Mon Sep 17 00:00:00 2001
From: Gyan Doshi <gyandoshi at gmail.com>
Date: Mon, 29 Jan 2018 12:11:41 +0530
Subject: [PATCH 2/4] avformat/mpegenc - log error messages for unsupported
 LPCM streams

The MPEG-PS muxer only accepts PCM S16BE streams having up to 8 channels
and one of the following sampling rates: 32 kHz 44.1kHz 48 kHz 96 kHz.
---
 libavformat/mpegenc.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/libavformat/mpegenc.c b/libavformat/mpegenc.c
index 695de3f081..1be0cd56a3 100644
--- a/libavformat/mpegenc.c
+++ b/libavformat/mpegenc.c
@@ -369,10 +369,19 @@ static av_cold int mpeg_mux_init(AVFormatContext *ctx)
                     if (lpcm_freq_tab[j] == st->codecpar->sample_rate)
                         break;
                 }
-                if (j == 4)
+                if (j == 4) {
+                    int sr;
+                    av_log(ctx, AV_LOG_ERROR, "Invalid sampling rate for PCM stream.\n");
+                    av_log(ctx, AV_LOG_INFO, "Allowed sampling rates:");
+                    for (sr = 0; sr < 4; sr++)
+                         av_log(ctx, AV_LOG_INFO, " %d", lpcm_freq_tab[sr]);
+                    av_log(ctx, AV_LOG_INFO, "\n");
                     goto fail;
-                if (st->codecpar->channels > 8)
-                    return -1;
+                }
+                if (st->codecpar->channels > 8) {
+                    av_log(ctx, AV_LOG_ERROR, "At most 8 channels allowed for LPCM streams.\n");
+                    return AVERROR(EINVAL);
+                }
                 stream->lpcm_header[0] = 0x0c;
                 stream->lpcm_header[1] = (st->codecpar->channels - 1) | (j << 4);
                 stream->lpcm_header[2] = 0x80;
-- 
2.11.1.windows.1