diff options
| -rw-r--r-- | libavformat/au.c | 50 |
1 files changed, 19 insertions, 31 deletions
diff --git a/libavformat/au.c b/libavformat/au.c index a8906a9db7..c09f4da4c9 100644 --- a/libavformat/au.c +++ b/libavformat/au.c @@ -35,8 +35,6 @@ /* if we don't know the size in advance */ #define AU_UNKNOWN_SIZE ((uint32_t)(~0)) -/* the specification requires an annotation field of at least eight bytes */ -#define AU_DEFAULT_HEADER_SIZE (24+8) static const AVCodecTag codec_au_tags[] = { { AV_CODEC_ID_PCM_MULAW, 1 }, @@ -241,7 +239,7 @@ typedef struct AUContext { #include "rawenc.h" -static int au_get_annotations(AVFormatContext *s, char **buffer) +static int au_get_annotations(AVFormatContext *s, AVBPrint *annotations) { static const char keys[][7] = { "Title", @@ -253,21 +251,19 @@ static int au_get_annotations(AVFormatContext *s, char **buffer) int cnt = 0; AVDictionary *m = s->metadata; AVDictionaryEntry *t = NULL; - AVBPrint bprint; - - av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED); for (int i = 0; i < FF_ARRAY_ELEMS(keys); i++) { t = av_dict_get(m, keys[i], NULL, 0); if (t != NULL) { if (cnt++) - av_bprint_chars(&bprint, '\n', 1); - av_bprintf(&bprint, "%s=%s", keys[i], t->value); + av_bprint_chars(annotations, '\n', 1); + av_bprintf(annotations, "%s=%s", keys[i], t->value); } } - /* pad with 0's */ - av_bprint_chars(&bprint, '\0', 8); - return av_bprint_finalize(&bprint, buffer); + /* The specification requires the annotation field to be zero-terminated + * and its length to be a multiple of eight, so pad with 0's */ + av_bprint_chars(annotations, '\0', 8); + return av_bprint_is_complete(annotations) ? 0 : AVERROR(ENOMEM); } static int au_write_header(AVFormatContext *s) @@ -276,9 +272,7 @@ static int au_write_header(AVFormatContext *s) AUContext *au = s->priv_data; AVIOContext *pb = s->pb; AVCodecParameters *par = s->streams[0]->codecpar; - char *annotations = NULL; - - au->header_size = AU_DEFAULT_HEADER_SIZE; + AVBPrint annotations; if (s->nb_streams != 1) { av_log(s, AV_LOG_ERROR, "only one stream is supported\n"); @@ -291,30 +285,24 @@ static int au_write_header(AVFormatContext *s) return AVERROR(EINVAL); } - if (av_dict_count(s->metadata) > 0) { - ret = au_get_annotations(s, &annotations); - if (ret < 0) - return ret; - if (annotations != NULL) { - au->header_size = (24 + strlen(annotations) + 8) & ~7; - if (au->header_size < AU_DEFAULT_HEADER_SIZE) - au->header_size = AU_DEFAULT_HEADER_SIZE; - } - } + av_bprint_init(&annotations, 0, INT_MAX - 24); + ret = au_get_annotations(s, &annotations); + if (ret < 0) + goto fail; + au->header_size = 24 + annotations.len & ~7; + ffio_wfourcc(pb, ".snd"); /* magic number */ avio_wb32(pb, au->header_size); /* header size */ avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */ avio_wb32(pb, par->codec_tag); /* codec ID */ avio_wb32(pb, par->sample_rate); avio_wb32(pb, par->channels); - if (annotations != NULL) { - avio_write(pb, annotations, au->header_size - 24); - av_freep(&annotations); - } else { - avio_wb64(pb, 0); /* annotation field */ - } + avio_write(pb, annotations.str, annotations.len & ~7); - return 0; +fail: + av_bprint_finalize(&annotations, NULL); + + return ret; } static int au_write_trailer(AVFormatContext *s) |