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Diffstat (limited to 'modules/gst_video/h264.c')
| -rw-r--r-- | modules/gst_video/h264.c | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/modules/gst_video/h264.c b/modules/gst_video/h264.c deleted file mode 100644 index 6f314e8..0000000 --- a/modules/gst_video/h264.c +++ /dev/null @@ -1,160 +0,0 @@ -/** - * @file gst_video/h264.c H.264 Packetization - * - * Copyright (C) 2010 Creytiv.com - */ -#include <string.h> -#include <re.h> -#include <rem.h> -#include <baresip.h> -#include "gst_video.h" - - -/** NAL unit types (RFC 3984, Table 1) */ -enum { - H264_NAL_UNKNOWN = 0, - /* 1-23 NAL unit Single NAL unit packet per H.264 */ - H264_NAL_SLICE = 1, - H264_NAL_DPA = 2, - H264_NAL_DPB = 3, - H264_NAL_DPC = 4, - H264_NAL_IDR_SLICE = 5, - H264_NAL_SEI = 6, - H264_NAL_SPS = 7, - H264_NAL_PPS = 8, - H264_NAL_AUD = 9, - H264_NAL_END_SEQUENCE = 10, - H264_NAL_END_STREAM = 11, - H264_NAL_FILLER_DATA = 12, - H264_NAL_SPS_EXT = 13, - H264_NAL_AUX_SLICE = 19, - - H264_NAL_STAP_A = 24, /**< Single-time aggregation packet */ - H264_NAL_STAP_B = 25, /**< Single-time aggregation packet */ - H264_NAL_MTAP16 = 26, /**< Multi-time aggregation packet */ - H264_NAL_MTAP24 = 27, /**< Multi-time aggregation packet */ - H264_NAL_FU_A = 28, /**< Fragmentation unit */ - H264_NAL_FU_B = 29, /**< Fragmentation unit */ -}; - - -const uint8_t h264_level_idc = 0x0c; - - -/* - * Find the NAL start sequence in a H.264 byte stream - * - * @note: copied from ffmpeg source - */ -static const uint8_t *h264_find_startcode(const uint8_t *p, const uint8_t *end) -{ - const uint8_t *a = p + 4 - ((long)p & 3); - - for (end -= 3; p < a && p < end; p++ ) { - if (p[0] == 0 && p[1] == 0 && p[2] == 1) - return p; - } - - for (end -= 3; p < end; p += 4) { - uint32_t x = *(const uint32_t*)(void *)p; - if ( (x - 0x01010101) & (~x) & 0x80808080 ) { - if (p[1] == 0 ) { - if ( p[0] == 0 && p[2] == 1 ) - return p; - if ( p[2] == 0 && p[3] == 1 ) - return p+1; - } - if ( p[3] == 0 ) { - if ( p[2] == 0 && p[4] == 1 ) - return p+2; - if ( p[4] == 0 && p[5] == 1 ) - return p+3; - } - } - } - - for (end += 3; p < end; p++) { - if (p[0] == 0 && p[1] == 0 && p[2] == 1) - return p; - } - - return end + 3; -} - - -static int rtp_send_data(const uint8_t *hdr, size_t hdr_sz, - const uint8_t *buf, size_t sz, bool eof, - videnc_packet_h *pkth, void *arg) -{ - return pkth(eof, hdr, hdr_sz, buf, sz, arg); -} - - -static int h264_nal_send(bool first, bool last, - bool marker, uint32_t ihdr, const uint8_t *buf, - size_t size, size_t maxsz, - videnc_packet_h *pkth, void *arg) -{ - uint8_t hdr = (uint8_t)ihdr; - int err = 0; - - if (first && last && size <= maxsz) { - err = rtp_send_data(&hdr, 1, buf, size, marker, - pkth, arg); - } - else { - uint8_t fu_hdr[2]; - const uint8_t type = hdr & 0x1f; - const uint8_t nri = hdr & 0x60; - const size_t sz = maxsz - 2; - - fu_hdr[0] = nri | H264_NAL_FU_A; - fu_hdr[1] = first ? (1<<7 | type) : type; - - while (size > sz) { - err |= rtp_send_data(fu_hdr, 2, buf, sz, false, - pkth, arg); - buf += sz; - size -= sz; - fu_hdr[1] &= ~(1 << 7); - } - - if (last) - fu_hdr[1] |= 1<<6; /* end bit */ - - err |= rtp_send_data(fu_hdr, 2, buf, size, marker && last, - pkth, arg); - } - - return err; -} - - -int h264_packetize(const uint8_t *buf, size_t len, - size_t pktsize, - videnc_packet_h *pkth, void *arg) -{ - const uint8_t *start = buf; - const uint8_t *end = start + len; - const uint8_t *r; - int err = 0; - - r = h264_find_startcode(buf, end); - - while (r < end) { - const uint8_t *r1; - - /* skip zeros */ - while (!*(r++)) - ; - - r1 = h264_find_startcode(r, end); - - err |= h264_nal_send(true, true, (r1 >= end), r[0], - r+1, r1-r-1, pktsize, - pkth, arg); - r = r1; - } - - return err; -} |