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libavformat/aac: Parse ID3 tags between ADTS frames. 

While rare, ID3 tags may be inserted between ADTS frames. This change enables
parsing them and setting the appropriate metadata updated event flag.
This commit is contained in:
Richard Shaffer 2018-02-01 18:37:45 -08:00 committed by wm4
parent 192ea5bb77
commit e023334661
1 changed files with 43 additions and 2 deletions
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43
libavformat/aacdec.c
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@ -22,8 +22,10 @@
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "id3v1.h"
#include "id3v2.h"
#include "apetag.h"
#define ADTS_HEADER_SIZE 7
@ -116,13 +118,52 @@ static int adts_aac_read_header(AVFormatContext *s)
return 0;
}
static int handle_id3(AVFormatContext *s, AVPacket *pkt)
{
AVDictionary *metadata = NULL;
AVIOContext ioctx;
ID3v2ExtraMeta *id3v2_extra_meta = NULL;
int ret;
ret = av_append_packet(s->pb, pkt, ff_id3v2_tag_len(pkt->data) - pkt->size);
if (ret < 0) {
av_packet_unref(pkt);
return ret;
}
ffio_init_context(&ioctx, pkt->data, pkt->size, 0, NULL, NULL, NULL, NULL);
ff_id3v2_read_dict(&ioctx, &metadata, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
if ((ret = ff_id3v2_parse_priv_dict(&metadata, &id3v2_extra_meta)) < 0)
goto error;
if (metadata) {
if ((ret = av_dict_copy(&s->metadata, metadata, 0)) < 0)
goto error;
s->event_flags |= AVFMT_EVENT_FLAG_METADATA_UPDATED;
}
error:
av_packet_unref(pkt);
ff_id3v2_free_extra_meta(&id3v2_extra_meta);
av_dict_free(&metadata);
return ret;
}
static int adts_aac_read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, fsize;
ret = av_get_packet(s->pb, pkt, FFMAX(ID3v2_HEADER_SIZE, ADTS_HEADER_SIZE));
if (ret >= ID3v2_HEADER_SIZE && ff_id3v2_match(pkt->data, ID3v2_DEFAULT_MAGIC)) {
if ((ret = handle_id3(s, pkt)) >= 0)
ret = av_get_packet(s->pb, pkt, ADTS_HEADER_SIZE);
}
if (ret < 0)
return ret;
if (ret < ADTS_HEADER_SIZE) {
av_packet_unref(pkt);
return AVERROR(EIO);
@ -139,7 +180,7 @@ static int adts_aac_read_packet(AVFormatContext *s, AVPacket *pkt)
return AVERROR_INVALIDDATA;
}
ret = av_append_packet(s->pb, pkt, fsize - ADTS_HEADER_SIZE);
ret = av_append_packet(s->pb, pkt, fsize - pkt->size);
if (ret < 0)
av_packet_unref(pkt);