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avformat/mpc: Simplify cleanup

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Currently Musepack allocates an array that needs to be freed later in
the demuxer's read_close-function; it is the sole reason for said
function's existence. But it is unnecessary, because one can store this
array in the stream's priv_data pointer, so that it will be freed
generically.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-04-02 18:09:49 +02:00
parent 3059b7746a
commit 18d69e9a98
1 changed files with 16 additions and 24 deletions
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40
libavformat/mpc.c
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@ -57,6 +57,7 @@ static int mpc_read_header(AVFormatContext *s)
{
MPCContext *c = s->priv_data;
AVStream *st;
int ret;
if(avio_rl24(s->pb) != MKTAG('M', 'P', '+', 0)){
av_log(s, AV_LOG_ERROR, "Not a Musepack file\n");
@ -72,15 +73,6 @@ static int mpc_read_header(AVFormatContext *s)
av_log(s, AV_LOG_ERROR, "Too many frames, seeking is not possible\n");
return AVERROR_INVALIDDATA;
}
if(c->fcount){
c->frames = av_malloc(c->fcount * sizeof(MPCFrame));
if(!c->frames){
av_log(s, AV_LOG_ERROR, "Cannot allocate seektable\n");
return AVERROR(ENOMEM);
}
}else{
av_log(s, AV_LOG_WARNING, "Container reports no frames\n");
}
c->curframe = 0;
c->lastframe = -1;
c->curbits = 8;
@ -88,15 +80,27 @@ static int mpc_read_header(AVFormatContext *s)
st = avformat_new_stream(s, NULL);
if (!st)
goto mem_error;
return AVERROR(ENOMEM);
if (c->fcount) {
c->frames = av_malloc(c->fcount * sizeof(MPCFrame));
if (!c->frames) {
av_log(s, AV_LOG_ERROR, "Cannot allocate seektable\n");
return AVERROR(ENOMEM);
}
st->priv_data = c->frames;
} else {
av_log(s, AV_LOG_WARNING, "Container reports no frames\n");
}
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_MUSEPACK7;
st->codecpar->channels = 2;
st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
st->codecpar->bits_per_coded_sample = 16;
if (ff_get_extradata(s, st->codecpar, s->pb, 16) < 0)
goto mem_error;
if ((ret = ff_get_extradata(s, st->codecpar, s->pb, 16)) < 0)
return ret;
st->codecpar->sample_rate = mpc_rate[st->codecpar->extradata[2] & 3];
avpriv_set_pts_info(st, 32, MPC_FRAMESIZE, st->codecpar->sample_rate);
/* scan for seekpoints */
@ -113,9 +117,6 @@ static int mpc_read_header(AVFormatContext *s)
}
return 0;
mem_error:
av_freep(&c->frames);
return AVERROR(ENOMEM);
}
static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt)
@ -176,14 +177,6 @@ static int mpc_read_packet(AVFormatContext *s, AVPacket *pkt)
return 0;
}
static int mpc_read_close(AVFormatContext *s)
{
MPCContext *c = s->priv_data;
av_freep(&c->frames);
return 0;
}
/**
* Seek to the given position
* If position is unknown but is within the limits of file
@ -232,7 +225,6 @@ AVInputFormat ff_mpc_demuxer = {
.read_probe = mpc_probe,
.read_header = mpc_read_header,
.read_packet = mpc_read_packet,
.read_close = mpc_read_close,
.read_seek = mpc_read_seek,
.extensions = "mpc",
};