Methods and Systems for HTTP Streaming Using an Intelligent HTTP Client

• US 20080114894A1
• Filed: 07/16/2007
• Published: 05/15/2008
• Est. Priority Date: 11/09/2006
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Deshpande, Sachin G.
• Granted Patent: US 7,640,358 B2
• Time in Patent Office: Days
• US Class Current: 709/237
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]

Abstract

Elements of the present invention relate to systems and methods for controlling the transmission rate of HTTP streaming processes with an intelligent HTTP client.

Claims

1. A method for regulating the rate of data transmission for a data file, said method comprising:

a) selecting first byte-range data to identify a first chunk of data in said data file;

b) determining a target transmission rate;

c) sending an HTTP Get Request requesting said first chunk of data identified with said first byte-range data;

d) receiving said first chunk of data in an HTTP Response;

e) storing said first chunk of data in a client buffer;

f) determining whether the actual transmission rate of said first chunk of data exceeds said target transmission rate;

g) waiting for a specific wait period and then selecting new byte-range data to identify another chunk of data in said data file if said actual transmission rate exceeds said target transmission rate;

h) immediately selecting next byte-range data to identify an untransmitted next chunk of data in said data file if said actual transmission rate does not exceed said target transmission rate;

i) sending an HTTP Get Request requesting said next chunk of data identified with said next byte-range data;

j) receiving said next chunk of data in an HTTP Response;

k) storing said next chunk of data in a client buffer;

l) determining whether the actual transmission rate of all transmitted chunks of data exceeds said target transmission rate;

m) waiting for a specific wait period when said actual transmission rate of all transmitted chunks exceeds said target transmission rate; and

n) selecting new next byte-range data to identify another untransmitted next chunk of data in said data file if said actual transmission rate of all transmitted chunks does not exceed said target transmission rate.

2. A method as described in claim 1 further comprising determining a client buffer fullness level and wherein said waiting is performed only when said actual transmission rate of all transmitted chunks exceeds said target transmission rate and said client meets a fullness requirement.

3. A method as described in claim 1 wherein said target transmission rate is dependent on a media file bitrate, a media file duration and a client buffer size.

4. A method as described in claim 1 wherein said target transmission rate is calculated using the equation:

(1+(R*T)/(8*D))*R

wherein R is a media file bitrate, T is a media file duration and D is a client buffer size.

5. A method as described in claim 1 wherein said HTTP Response is an HTTP/1.1 206 Response.

6. A method as described in claim 1 wherein said determining whether the actual transmission rate of said first chunk of data exceeds said target transmission rate comprises calculating a bitsahead variable.

7. A method as described in claim 1 wherein said determining whether the actual transmission rate of said first chunk of data exceeds said target transmission rate comprises calculating a bitsahead variable by subtracting the value obtained from multiplying the target bitrate by an elapsed time from the value obtained by multiplying the number of bytes received by the number of bits in a byte.

8. A method as described in claim 1 wherein said determining whether the actual transmission rate of said all transmitted chunks of data exceeds said target transmission rate comprises calculating a bitsahead variable by subtracting the value obtained from multiplying the target bitrate by an elapsed time from the value obtained by multiplying the number of bytes received by the number of bits in a byte.

9. A method as described in claim 1 wherein said specific wait period is determined by dividing the number of bits received in addition to the number of bits anticipated to have been received at the target bitrate and dividing this number by the target bitrate.

10. A method for regulating the rate of data transmission for a data file with an HTTP client, said method comprising:

a) determining a media file bitrate, R;

b) determining a media file duration, T;

c) determining a client buffer size, D;

d) determining a data chunk size, C;

e) selecting first byte-range data to identify a first chunk of data in said data file;

f) determining a target transmission rate, TR, with the equation;

TR=(1+(R*T)/(8*D))*R

g) determining a start time;

h) sending an HTTP Get Request requesting said first chunk of data identified with said first byte-range data;

i) receiving said first chunk of data in an HTTP/1.1 206 Response;

j) storing said first chunk of data in a client buffer;

k) determining a current time;

l) determining an elapsed time by subtracting said start time from said current time;

m) determining the number of bytes received in said first chunk of data;

n) calculating the number of bits received in addition to that which would have been received at said target bitrate by subtracting the value obtained from multiplying said target bitrate by said elapsed time from the value obtained by multiplying the number of bytes received by the number of bits in a byte

o) waiting for a specific wait period and then selecting new byte-range data to identify another chunk of data in said data file if said number of bits received in addition to that which would have been received at said target bitrate is greater than zero, wherein said specific wait period is calculated by dividing said number of bits received in addition to that which would have been received at said target bitrate by said target bitrate; and

p) immediately selecting said next byte-range data to identify said untransmitted next chunk of data in said data file if said number of bits received in addition to that which would have been received at said target bitrate is not greater than zero.

11. A method as described in claim 10 further comprising:

q) sending an HTTP Get Request requesting said next chunk of data identified with said next byte-range data;

r) receiving said next chunk of data in an HTTP/1.1 206 Response;

s) storing said next chunk of data in said client buffer;

t) determining a next current time;

u) determining an next elapsed time by subtracting said start time from said next current time;

v) determining a total number of bytes received at said next current time;

w) calculating a next number of bits received in addition to that which would have been received at said target bitrate by subtracting the value obtained from multiplying said target bitrate by said next elapsed time from the value obtained by multiplying said total number of bytes received by the number of bits in a byte

x) waiting for a next specific wait period and then selecting next new byte-range data to identify another untransmitted chunk of data in said data file if said next number of bits received in addition to that which would have been received at said target bitrate is greater than zero, wherein said next specific wait period is calculated by dividing said next number of bits received in addition to that which would have been received at said target bitrate by said target bitrate; and

y) immediately selecting said next new byte-range data to identify said untransmitted chunk of data in said data file if said next number of bits received in addition to that which would have been received at said target bitrate is not greater than zero.

12. A method as described in claim 10 further comprising determining whether a pause selection has been made and pausing said method wherein said pausing terminates all data transmission after step o) when said pause selection has been made.

13. A method as described in claim 10 further comprising determining whether a pause selection has been made and pausing said method wherein said pausing terminates all data transmission after step p) when said pause selection has been made.

14. A system for regulating the rate of data transmission for a data file, said apparatus comprising:

a) a bitrate determiner for determining a media file bitrate;

b) a file duration determiner for determining a media file duration;

c) a buffer determiner for determining a client buffer size;

d) a size determiner for determining a data chunk size;

e) a first byte-range selector for selecting first byte-range data to identify a first chunk of data in said data file;

f) a target determiner for determining a target transmission rate;

g) a sender for sending an HTTP Get Request requesting said first chunk of data identified with said first byte-range data;

h) a data receiver for receiving said first chunk of data in an HTTP Response;

i) a client buffer for storing said first chunk of data;

j) a rate determiner for determining whether the actual transmission rate of said first chunk of data exceeds said target transmission rate;

k) a delayer for waiting for a specific wait period and a selector for selecting new byte-range data to identify another chunk of data in said data file if said actual transmission rate exceeds said target transmission rate; and

l) wherein said selector immediately selects said next byte-range data to identify said untransmitted next chunk of data in said data file if said actual transmission rate does not exceed said target transmission rate.

15. A system as described in claim 14 further comprising:

a) said sender also sending an HTTP Get Request requesting said next chunk of data identified with said next byte-range data;

b) said receiver also receiving said next chunk of data in an HTTP Response;

c) said client buffer also for storing said next chunk of data;

d) said rate determiner also determining whether the actual transmission rate of all transmitted chunks of data exceeds said target transmission rate;

e) said delayer also for waiting for a specific wait period and said selector also for selecting new next byte-range data to identify another untransmitted next chunk of data in said data file if said actual transmission rate of all transmitted chunks exceeds said target transmission rate; and

f) said selector also for immediately selecting said new next byte-range data to identify another said untransmitted next chunk of data in said data file if said actual transmission rate of all untransmitted chunks does not exceed said target transmission rate.

16. A system as described in claim 14 wherein said target transmission rate is dependent on said media file bitrate, said media file duration and said client buffer size.

17. A system as described in claim 14 wherein said target transmission rate is calculated using the equation:

(1+(R*T)/(8*D))*R

wherein R is the media file bitrate, T is the media file duration and D is the client buffer size.

18. A system as described in claim 14 wherein said HTTP Response is an HTTP/1.1 206 Response.

19. A system as described in claim 14 wherein said determining whether the actual transmission rate of said first chunk of data exceeds said target transmission rate comprises calculating a bitsahead variable.

20. A system as described in claim 14 wherein said determining whether the actual transmission rate of said first chunk of data exceeds said target transmission rate comprises calculating a bitsahead variable by subtracting the value obtained from multiplying the target bitrate by an elapsed time from the value obtained by multiplying the number of bytes received by the number of bits in a byte.

21. A system as described in claim 14 wherein said determining whether the actual transmission rate of said all transmitted chunks of data exceeds said target transmission rate comprises calculating a bitsahead variable by subtracting the value obtained from multiplying the target bitrate by an elapsed time from the value obtained by multiplying the number of bytes received by the number of bits in a byte.