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author | Josh Allmann <joshua.allmann@gmail.com> | 2010-06-25 11:58:38 +0400 |
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committer | Martin Storsjö <martin@martin.st> | 2010-06-25 11:58:38 +0400 |
commit | 9b3788efc341d99dea6107a3683a2d73a1b1effe (patch) | |
tree | 3822f44303cdbd42b5fa2ba04af88126d3b892c0 /libavformat/rtpdec_mpeg4.c | |
parent | 30619e6e597ad5dc9a6312278b8dc0d9f3c45e74 (diff) |
RTSP: Decouple MPEG-4 and AAC specific parts from rtsp.c
Patch by Josh Allmann, joshua dot allmann at gmail
Originally committed as revision 23769 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/rtpdec_mpeg4.c')
-rw-r--r-- | libavformat/rtpdec_mpeg4.c | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/libavformat/rtpdec_mpeg4.c b/libavformat/rtpdec_mpeg4.c new file mode 100644 index 0000000000..8befef21ef --- /dev/null +++ b/libavformat/rtpdec_mpeg4.c @@ -0,0 +1,125 @@ +/** + * Common code for the RTP depacketization of MPEG-4 formats. + * Copyright (c) 2010 Fabrice Bellard + * Romain Degez + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * @brief MPEG4 / RTP Code + * @author Fabrice Bellard + * @author Romain Degez + */ + +#include "rtpdec_mpeg4.h" +#include "internal.h" +#include "libavutil/avstring.h" + +/* return the length and optionally the data */ +static int hex_to_data(uint8_t *data, const char *p) +{ + int c, len, v; + + len = 0; + v = 1; + for (;;) { + p += strspn(p, SPACE_CHARS); + if (*p == '\0') + break; + c = toupper((unsigned char) *p++); + if (c >= '0' && c <= '9') + c = c - '0'; + else if (c >= 'A' && c <= 'F') + c = c - 'A' + 10; + else + break; + v = (v << 4) | c; + if (v & 0x100) { + if (data) + data[len] = v; + len++; + v = 1; + } + } + return len; +} + +static int parse_fmtp_config(AVCodecContext * codec, char *value) +{ + /* decode the hexa encoded parameter */ + int len = hex_to_data(NULL, value); + if (codec->extradata) + av_free(codec->extradata); + codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE); + if (!codec->extradata) + return AVERROR(ENOMEM); + codec->extradata_size = len; + hex_to_data(codec->extradata, value); + return 0; +} + +static int parse_sdp_line(AVFormatContext *s, int st_index, + PayloadContext *data, const char *line) +{ + const char *p; + char value[4096], attr[25]; + int res = 0; + AVCodecContext* codec = s->streams[st_index]->codec; + + if (av_strstart(line, "fmtp:", &p)) { + // remove protocol identifier + while (*p && *p == ' ') p++; // strip spaces + while (*p && *p != ' ') p++; // eat protocol identifier + while (*p && *p == ' ') p++; // strip trailing spaces + + while (ff_rtsp_next_attr_and_value(&p, + attr, sizeof(attr), + value, sizeof(value))) { + if (!strcmp(attr, "config")) { + res = parse_fmtp_config(codec, value); + + if (res < 0) + return res; + } + } + } + + return 0; + +} + +RTPDynamicProtocolHandler ff_mp4v_es_dynamic_handler = { + .enc_name = "MP4V-ES", + .codec_type = AVMEDIA_TYPE_VIDEO, + .codec_id = CODEC_ID_MPEG4, + .parse_sdp_a_line = parse_sdp_line, + .open = NULL, + .close = NULL, + .parse_packet = NULL +}; + +RTPDynamicProtocolHandler ff_mpeg4_generic_dynamic_handler = { + .enc_name = "mpeg4-generic", + .codec_type = AVMEDIA_TYPE_AUDIO, + .codec_id = CODEC_ID_AAC, + .parse_sdp_a_line = parse_sdp_line, + .open = NULL, + .close = NULL, + .parse_packet = NULL +}; |