diff options
author | Martin Storsjö <martin@martin.st> | 2012-05-05 01:05:52 +0400 |
---|---|---|
committer | Martin Storsjö <martin@martin.st> | 2012-05-05 21:32:29 +0400 |
commit | f3d471f45fdafab19373cde74518bb61a27266b1 (patch) | |
tree | 6ed0da117e0ae66657a9ae8ba9154ccb3a3a46e4 /libavformat/rtpdec_h264.c | |
parent | dee48d095d23ac2cf5e15574bc6bb963722edc48 (diff) |
rtpdec_h264: Clean up comments
Split long comments, move long comments at the end of lines to
separate lines above, fix vertical alignment, fix up comment style
(unify trailing dots - comments had a mix of 2, 3 or 4 dots, where
it would be just as good without them at all).
Signed-off-by: Martin Storsjö <martin@martin.st>
Diffstat (limited to 'libavformat/rtpdec_h264.c')
-rw-r--r-- | libavformat/rtpdec_h264.c | 51 |
1 files changed, 29 insertions, 22 deletions
diff --git a/libavformat/rtpdec_h264.c b/libavformat/rtpdec_h264.c index 505bc8171b..228bab0b58 100644 --- a/libavformat/rtpdec_h264.c +++ b/libavformat/rtpdec_h264.c @@ -20,7 +20,7 @@ */ /** -* @file + * @file * @brief H.264 / RTP Code (RFC3984) * @author Ryan Martell <rdm4@martellventures.com> * @@ -29,7 +29,8 @@ * This currently supports packetization mode: * Single Nal Unit Mode (0), or * Non-Interleaved Mode (1). It currently does not support - * Interleaved Mode (2). (This requires implementing STAP-B, MTAP16, MTAP24, FU-B packet types) + * Interleaved Mode (2). (This requires implementing STAP-B, MTAP16, MTAP24, + * FU-B packet types) */ #include "libavutil/base64.h" @@ -46,7 +47,7 @@ #include "rtpdec_formats.h" struct PayloadContext { - //sdp setup parameters + // sdp setup parameters uint8_t profile_idc; uint8_t profile_iop; uint8_t level_idc; @@ -68,10 +69,11 @@ static int sdp_parse_fmtp_config_h264(AVStream * stream, av_log(codec, AV_LOG_DEBUG, "RTP Packetization Mode: %d\n", atoi(value)); h264_data->packetization_mode = atoi(value); /* - Packetization Mode: - 0 or not present: Single NAL mode (Only nals from 1-23 are allowed) - 1: Non-interleaved Mode: 1-23, 24 (STAP-A), 28 (FU-A) are allowed. - 2: Interleaved Mode: 25 (STAP-B), 26 (MTAP16), 27 (MTAP24), 28 (FU-A), and 29 (FU-B) are allowed. + * Packetization Mode: + * 0 or not present: Single NAL mode (Only nals from 1-23 are allowed) + * 1: Non-interleaved Mode: 1-23, 24 (STAP-A), 28 (FU-A) are allowed. + * 2: Interleaved Mode: 25 (STAP-B), 26 (MTAP16), 27 (MTAP24), 28 (FU-A), + * and 29 (FU-B) are allowed. */ if (h264_data->packetization_mode > 1) av_log(codec, AV_LOG_ERROR, @@ -149,7 +151,7 @@ static int sdp_parse_fmtp_config_h264(AVStream * stream, return 0; } -// return 0 on packet, no more left, 1 on packet, 1 on partial packet... +// return 0 on packet, no more left, 1 on packet, 1 on partial packet static int h264_handle_packet(AVFormatContext *ctx, PayloadContext *data, AVStream *st, @@ -173,8 +175,10 @@ static int h264_handle_packet(AVFormatContext *ctx, assert(data); assert(buf); + /* Simplify the case (these are all the nal types used internally by + * the h264 codec). */ if (type >= 1 && type <= 23) - type = 1; // simplify the case. (these are all the nal types used internally by the h264 codec) + type = 1; switch (type) { case 0: // undefined, but pass them through case 1: @@ -190,7 +194,7 @@ static int h264_handle_packet(AVFormatContext *ctx, // consume the STAP-A NAL buf++; len--; - // first we are going to figure out the total size.... + // first we are going to figure out the total size { int pass= 0; int total_length= 0; @@ -203,13 +207,13 @@ static int h264_handle_packet(AVFormatContext *ctx, while (src_len > 2) { uint16_t nal_size = AV_RB16(src); - // consume the length of the aggregate... + // consume the length of the aggregate src += 2; src_len -= 2; if (nal_size <= src_len) { if(pass==0) { - // counting... + // counting total_length+= sizeof(start_sequence)+nal_size; } else { // copying @@ -227,7 +231,7 @@ static int h264_handle_packet(AVFormatContext *ctx, "nal size exceeds length: %d %d\n", nal_size, src_len); } - // eat what we handled... + // eat what we handled src += nal_size; src_len -= nal_size; @@ -237,7 +241,8 @@ static int h264_handle_packet(AVFormatContext *ctx, } if(pass==0) { - // now we know the total size of the packet (with the start sequences added) + /* now we know the total size of the packet (with the + * start sequences added) */ av_new_packet(pkt, total_length); dst= pkt->data; } else { @@ -259,9 +264,9 @@ static int h264_handle_packet(AVFormatContext *ctx, case 28: // FU-A (fragmented nal) buf++; - len--; // skip the fu_indicator + len--; // skip the fu_indicator if (len > 1) { - // these are the same as above, we just redo them here for clarity... + // these are the same as above, we just redo them here for clarity uint8_t fu_indicator = nal; uint8_t fu_header = *buf; uint8_t start_bit = fu_header >> 7; @@ -269,11 +274,13 @@ static int h264_handle_packet(AVFormatContext *ctx, uint8_t nal_type = (fu_header & 0x1f); uint8_t reconstructed_nal; - // reconstruct this packet's true nal; only the data follows.. - reconstructed_nal = fu_indicator & (0xe0); // the original nal forbidden bit and NRI are stored in this packet's nal; + // Reconstruct this packet's true nal; only the data follows. + /* The original nal forbidden bit and NRI are stored in this + * packet's nal. */ + reconstructed_nal = fu_indicator & (0xe0); reconstructed_nal |= nal_type; - // skip the fu_header... + // skip the fu_header buf++; len--; @@ -282,7 +289,7 @@ static int h264_handle_packet(AVFormatContext *ctx, data->packet_types_received[nal_type]++; #endif if(start_bit) { - // copy in the start sequence, and the reconstructed nal.... + /* copy in the start sequence, and the reconstructed nal */ av_new_packet(pkt, sizeof(start_sequence)+sizeof(nal)+len); memcpy(pkt->data, start_sequence, sizeof(start_sequence)); pkt->data[sizeof(start_sequence)]= reconstructed_nal; @@ -347,7 +354,7 @@ static int parse_h264_sdp_line(AVFormatContext *s, int st_index, char buf1[50]; char *dst = buf1; - // remove the protocol identifier.. + // remove the protocol identifier while (*p && *p == ' ') p++; // strip spaces. while (*p && *p != ' ') p++; // eat protocol identifier while (*p && *p == ' ') p++; // strip trailing spaces. @@ -357,7 +364,7 @@ static int parse_h264_sdp_line(AVFormatContext *s, int st_index, *dst = '\0'; // a='framesize:96 320-240' - // set our parameters.. + // set our parameters codec->width = atoi(buf1); codec->height = atoi(p + 1); // skip the - codec->pix_fmt = PIX_FMT_YUV420P; |