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rtmp: Don't blindly skip the 4 trailer bytes from the FLV packets

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If not enough bytes are available, keep track of them and skip
them on next call.

In practice, if these trailer bytes are written in a separate
call, there is no other data written in this call, making it
fall into the "FLV packet too small" case currently - working,
but not as intended.

This patch makes the code more robust, handling all cases
except for having the FLV packet header split over multiple
write calls.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2011-09-20 16:00:52 +03:00
parent a14c784210
commit 3ffe32eb96
1 changed files with 19 additions and 3 deletions
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22
libavformat/rtmpproto.c
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@ -71,6 +71,7 @@ typedef struct RTMPContext {
uint32_t client_report_size; ///< number of bytes after which client should report to server
uint32_t bytes_read; ///< number of bytes read from server
uint32_t last_bytes_read; ///< number of bytes read last reported to server
int skip_bytes; ///< number of bytes to skip from the input FLV stream in the next write call
} RTMPContext;
#define PLAYER_KEY_OPEN_PART_LEN 30 ///< length of partial key used for first client digest signing
@ -925,7 +926,16 @@ static int rtmp_write(URLContext *s, const uint8_t *buf, int size)
uint32_t ts;
const uint8_t *buf_temp = buf;
if (!rt->flv_off && size < 11) {
if (rt->skip_bytes) {
int skip = FFMIN(rt->skip_bytes, size);
buf_temp += skip;
size_temp -= skip;
rt->skip_bytes -= skip;
if (size_temp <= 0)
return size;
}
if (!rt->flv_off && size_temp < 11) {
av_log(s, AV_LOG_DEBUG, "FLV packet too small %d\n", size);
return 0;
}
@ -974,8 +984,14 @@ static int rtmp_write(URLContext *s, const uint8_t *buf, int size)
}
if (rt->flv_off == rt->flv_size) {
bytestream_get_be32(&buf_temp);
size_temp -= 4;
if (size_temp < 4) {
rt->skip_bytes = 4 - size_temp;
buf_temp += size_temp;
size_temp = 0;
} else {
bytestream_get_be32(&buf_temp);
size_temp -= 4;
}
ff_rtmp_packet_write(rt->stream, &rt->out_pkt, rt->chunk_size, rt->prev_pkt[1]);
ff_rtmp_packet_destroy(&rt->out_pkt);
rt->flv_size = 0;