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rtpdec_mpeg4: Return one AAC AU per AVPacket 

This makes the returned data valid to stream copy into other
containers as well, not only for decoding straight away.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2013-01-15 16:58:48 +02:00
parent d160a2fb4c
commit 21f5c24b80
1 changed files with 31 additions and 12 deletions
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43
libavformat/rtpdec_mpeg4.c
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@ -57,6 +57,9 @@ struct PayloadContext {
int nb_au_headers;
int au_headers_length_bytes;
int cur_au_index;
uint8_t buf[RTP_MAX_PACKET_LENGTH];
int buf_pos, buf_size;
};
typedef struct {
@ -149,18 +152,11 @@ static int rtp_parse_mp4_au(PayloadContext *data, const uint8_t *buf, int len)
data->au_headers_allocated = data->nb_au_headers;
}
/* XXX: We handle multiple AU Section as only one (need to fix this for interleaving)
In my test, the FAAD decoder does not behave correctly when sending each AU one by one
but does when sending the whole as one big packet... */
data->au_headers[0].size = 0;
data->au_headers[0].index = 0;
for (i = 0; i < data->nb_au_headers; ++i) {
data->au_headers[0].size += get_bits_long(&getbitcontext, data->sizelength);
data->au_headers[0].index = get_bits_long(&getbitcontext, data->indexlength);
data->au_headers[i].size = get_bits_long(&getbitcontext, data->sizelength);
data->au_headers[i].index = get_bits_long(&getbitcontext, data->indexlength);
}
data->nb_au_headers = 1;
return 0;
}
@ -172,21 +168,44 @@ static int aac_parse_packet(AVFormatContext *ctx, PayloadContext *data,
int flags)
{
int ret;
if (!buf) {
if (data->cur_au_index > data->nb_au_headers)
return AVERROR_INVALIDDATA;
if (data->buf_size - data->buf_pos < data->au_headers[data->cur_au_index].size)
return AVERROR_INVALIDDATA;
if ((ret = av_new_packet(pkt, data->au_headers[data->cur_au_index].size)) < 0)
return ret;
memcpy(pkt->data, &data->buf[data->buf_pos], data->au_headers[data->cur_au_index].size);
data->buf_pos += data->au_headers[data->cur_au_index].size;
pkt->stream_index = st->index;
data->cur_au_index++;
return data->cur_au_index < data->nb_au_headers;
}
if (rtp_parse_mp4_au(data, buf, len))
return -1;
buf += data->au_headers_length_bytes + 2;
len -= data->au_headers_length_bytes + 2;
/* XXX: Fixme we only handle the case where rtp_parse_mp4_au define
one au_header */
if (len < data->au_headers[0].size)
return AVERROR_INVALIDDATA;
if ((ret = av_new_packet(pkt, data->au_headers[0].size)) < 0)
return ret;
memcpy(pkt->data, buf, data->au_headers[0].size);
len -= data->au_headers[0].size;
buf += data->au_headers[0].size;
pkt->stream_index = st->index;
if (len > 0 && data->nb_au_headers > 1) {
data->buf_size = FFMIN(len, sizeof(data->buf));
memcpy(data->buf, buf, data->buf_size);
data->cur_au_index = 1;
data->buf_pos = 0;
return 1;
}
return 0;
}