rtpdec: HEVC/H.265 support

As specified in draft-ietf-payload-rtp-h265-06.

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

1 files changed, 372 insertions, 0 deletions

diff --git a/libavformat/rtpdec_hevc.c b/libavformat/rtpdec_hevc.c
new file mode 100644
index 0000000000..aea3f381d3
--- /dev/null
+++ b/libavformat/rtpdec_hevc.c
@@ -0,0 +1,372 @@
+/*
+ * RTP parser for HEVC/H.265 payload format (draft version 6)
+ * Copyright (c) 2014 Thomas Volkert <thomas@homer-conferencing.com>
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#include "libavutil/avstring.h"
+
+#include "avformat.h"
+#include "rtpdec.h"
+
+#define RTP_HEVC_PAYLOAD_HEADER_SIZE  2
+#define RTP_HEVC_FU_HEADER_SIZE       1
+#define RTP_HEVC_DONL_FIELD_SIZE      2
+#define HEVC_SPECIFIED_NAL_UNIT_TYPES 48
+
+/* SDP out-of-band signaling data */
+struct PayloadContext {
+    int using_donl_field;
+    int profile_id;
+};
+
+static const uint8_t start_sequence[] = { 0x00, 0x00, 0x00, 0x01 };
+
+static av_cold PayloadContext *hevc_new_context(void)
+{
+    return av_mallocz(sizeof(PayloadContext));
+}
+
+static av_cold void hevc_free_context(PayloadContext *data)
+{
+    av_free(data);
+}
+
+static av_cold int hevc_init(AVFormatContext *ctx, int st_index,
+                             PayloadContext *data)
+{
+    av_dlog(ctx, "hevc_init() for stream %d\n", st_index);
+
+    if (st_index < 0)
+        return 0;
+
+    ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL;
+
+    return 0;
+}
+
+static av_cold int hevc_sdp_parse_fmtp_config(AVFormatContext *s,
+                                              AVStream *stream,
+                                              PayloadContext *hevc_data,
+                                              char *attr, char *value)
+{
+    /* profile-space: 0-3 */
+    /* profile-id: 0-31 */
+    if (!strcmp(attr, "profile-id")) {
+        hevc_data->profile_id = atoi(value);
+        av_dlog(s, "SDP: found profile-id: %d\n", hevc_data->profile_id);
+    }
+
+    /* tier-flag: 0-1 */
+    /* level-id: 0-255 */
+    /* interop-constraints: [base16] */
+    /* profile-compatibility-indicator: [base16] */
+    /* sprop-sub-layer-id: 0-6, defines highest possible value for TID, default: 6 */
+    /* recv-sub-layer-id: 0-6 */
+    /* max-recv-level-id: 0-255 */
+    /* tx-mode: MSM,SSM */
+    /* sprop-vps: [base64] */
+    /* sprop-sps: [base64] */
+    /* sprop-pps: [base64] */
+    /* sprop-sei: [base64] */
+    /* max-lsr, max-lps, max-cpb, max-dpb, max-br, max-tr, max-tc */
+    /* max-fps */
+
+    /* sprop-max-don-diff: 0-32767
+
+         When the RTP stream depends on one or more other RTP
+         streams (in this case tx-mode MUST be equal to "MSM" and
+         MSM is in use), this parameter MUST be present and the
+         value MUST be greater than 0.
+    */
+    if (!strcmp(attr, "sprop-max-don-diff")) {
+        if (atoi(value) > 0)
+            hevc_data->using_donl_field = 1;
+        av_dlog(s, "Found sprop-max-don-diff in SDP, DON field usage is: %d\n",
+                hevc_data->using_donl_field);
+    }
+
+    /* sprop-depack-buf-nalus: 0-32767 */
+    if (!strcmp(attr, "sprop-depack-buf-nalus")) {
+        if (atoi(value) > 0)
+            hevc_data->using_donl_field = 1;
+        av_dlog(s, "Found sprop-depack-buf-nalus in SDP, DON field usage is: %d\n",
+                hevc_data->using_donl_field);
+    }
+
+    /* sprop-depack-buf-bytes: 0-4294967295 */
+    /* depack-buf-cap */
+    /* sprop-segmentation-id: 0-3 */
+    /* sprop-spatial-segmentation-idc: [base16] */
+    /* dec-parallel-ca: */
+    /* include-dph */
+
+    return 0;
+}
+
+static av_cold int hevc_parse_sdp_line(AVFormatContext *ctx, int st_index,
+                                       PayloadContext *hevc_data, const char *line)
+{
+    AVStream *current_stream;
+    AVCodecContext *codec;
+    const char *sdp_line_ptr = line;
+
+    if (st_index < 0)
+        return 0;
+
+    current_stream = ctx->streams[st_index];
+    codec  = current_stream->codec;
+
+    if (av_strstart(sdp_line_ptr, "framesize:", &sdp_line_ptr)) {
+        char str_video_width[50];
+        char *str_video_width_ptr = str_video_width;
+
+        /*
+         * parse "a=framesize:96 320-240"
+         */
+
+        /* ignore spaces */
+        while (*sdp_line_ptr && *sdp_line_ptr == ' ')
+            sdp_line_ptr++;
+        /* ignore RTP payload ID */
+        while (*sdp_line_ptr && *sdp_line_ptr != ' ')
+            sdp_line_ptr++;
+        /* ignore spaces */
+        while (*sdp_line_ptr && *sdp_line_ptr == ' ')
+            sdp_line_ptr++;
+        /* extract the actual video resolution description */
+        while (*sdp_line_ptr && *sdp_line_ptr != '-' &&
+               (str_video_width_ptr - str_video_width) < sizeof(str_video_width) - 1)
+            *str_video_width_ptr++ = *sdp_line_ptr++;
+        /* add trailing zero byte */
+        *str_video_width_ptr = '\0';
+
+        /* determine the width value */
+        codec->width   = atoi(str_video_width);
+        /* jump beyond the "-" and determine the height value */
+        codec->height  = atoi(sdp_line_ptr + 1);
+    } else if (av_strstart(sdp_line_ptr, "fmtp:", &sdp_line_ptr)) {
+        return ff_parse_fmtp(ctx, current_stream, hevc_data, sdp_line_ptr,
+                             hevc_sdp_parse_fmtp_config);
+    }
+
+    return 0;
+}
+
+static int hevc_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_hevc_ctx,
+                              AVStream *st, AVPacket *pkt, uint32_t *timestamp,
+                              const uint8_t *buf, int len, uint16_t seq,
+                              int flags)
+{
+    const uint8_t *rtp_pl = buf;
+    int tid, lid, nal_type;
+    int first_fragment, last_fragment, fu_type;
+    uint8_t new_nal_header[2];
+    int res = 0;
+
+    /* sanity check for size of input packet: 1 byte payload at least */
+    if (len < RTP_HEVC_PAYLOAD_HEADER_SIZE + 1) {
+        av_log(ctx, AV_LOG_ERROR, "Too short RTP/HEVC packet, got %d bytes\n", len);
+        return AVERROR_INVALIDDATA;
+    }
+
+    /*
+      decode the HEVC payload header according to section 4 of draft version 6:
+
+         0                   1
+         0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+        |F|   Type    |  LayerId  | TID |
+        +-------------+-----------------+
+
+           Forbidden zero (F): 1 bit
+           NAL unit type (Type): 6 bits
+           NUH layer ID (LayerId): 6 bits
+           NUH temporal ID plus 1 (TID): 3 bits
+    */
+    nal_type =  (buf[0] >> 1) & 0x3f;
+    lid  = ((buf[0] << 5) & 0x20) | ((buf[1] >> 3) & 0x1f);
+    tid  =   buf[1] & 0x07;
+
+    /* sanity check for correct layer ID */
+    if (lid) {
+        /* future scalable or 3D video coding extensions */
+        avpriv_report_missing_feature(ctx, "Multi-layer HEVC coding\n");
+        return AVERROR_PATCHWELCOME;
+    }
+
+    /* sanity check for correct temporal ID */
+    if (!tid) {
+        av_log(ctx, AV_LOG_ERROR, "Illegal temporal ID in RTP/HEVC packet\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* sanity check for correct NAL unit type */
+    if (nal_type > 50) {
+        av_log(ctx, AV_LOG_ERROR, "Unsupported (HEVC) NAL type (%d)\n", nal_type);
+        return AVERROR_INVALIDDATA;
+    }
+
+    switch (nal_type) {
+    /* aggregated packets (AP) */
+    case 48:
+        /* pass the HEVC payload header */
+        buf += RTP_HEVC_PAYLOAD_HEADER_SIZE;
+        len -= RTP_HEVC_PAYLOAD_HEADER_SIZE;
+
+        /* pass the HEVC DONL field */
+        if (rtp_hevc_ctx->using_donl_field) {
+            buf += RTP_HEVC_DONL_FIELD_SIZE;
+            len -= RTP_HEVC_DONL_FIELD_SIZE;
+        }
+
+        /* fall-through */
+    /* video parameter set (VPS) */
+    case 32:
+    /* sequence parameter set (SPS) */
+    case 33:
+    /* picture parameter set (PPS) */
+    case 34:
+    /*  supplemental enhancement information (SEI) */
+    case 39:
+    /* single NAL unit packet */
+    default:
+        /* sanity check for size of input packet: 1 byte payload at least */
+        if (len < 1) {
+            av_log(ctx, AV_LOG_ERROR,
+                   "Too short RTP/HEVC packet, got %d bytes of NAL unit type %d\n",
+                   len, nal_type);
+            return AVERROR_INVALIDDATA;
+        }
+
+        /* create A/V packet */
+        if ((res = av_new_packet(pkt, sizeof(start_sequence) + len)) < 0)
+            return res;
+        /* A/V packet: copy start sequence */
+        memcpy(pkt->data, start_sequence, sizeof(start_sequence));
+        /* A/V packet: copy NAL unit data */
+        memcpy(pkt->data + sizeof(start_sequence), buf, len);
+
+        break;
+    /* fragmentation unit (FU) */
+    case 49:
+        /* pass the HEVC payload header */
+        buf += RTP_HEVC_PAYLOAD_HEADER_SIZE;
+        len -= RTP_HEVC_PAYLOAD_HEADER_SIZE;
+
+        if (len < 1)
+            return AVERROR_INVALIDDATA;
+        /*
+             decode the FU header
+
+              0 1 2 3 4 5 6 7
+             +-+-+-+-+-+-+-+-+
+             |S|E|  FuType   |
+             +---------------+
+
+                Start fragment (S): 1 bit
+                End fragment (E): 1 bit
+                FuType: 6 bits
+        */
+        first_fragment = buf[0] & 0x80;
+        last_fragment  = buf[0] & 0x40;
+        fu_type        = buf[0] & 0x3f;
+
+        /* pass the HEVC FU header */
+        buf += RTP_HEVC_FU_HEADER_SIZE;
+        len -= RTP_HEVC_FU_HEADER_SIZE;
+
+        /* pass the HEVC DONL field */
+        if (rtp_hevc_ctx->using_donl_field) {
+            buf += RTP_HEVC_DONL_FIELD_SIZE;
+            len -= RTP_HEVC_DONL_FIELD_SIZE;
+        }
+
+        av_dlog(ctx, " FU type %d with %d bytes\n", fu_type, len);
+
+        if (len > 0) {
+            new_nal_header[0] = (rtp_pl[0] & 0x81) | (fu_type << 1);
+            new_nal_header[1] = rtp_pl[1];
+
+            /* start fragment vs. subsequent fragments */
+            if (first_fragment) {
+                if (!last_fragment) {
+                    /* create A/V packet which is big enough */
+                    if ((res = av_new_packet(pkt, sizeof(start_sequence) + sizeof(new_nal_header) + len)) < 0)
+                        return res;
+                    /* A/V packet: copy start sequence */
+                    memcpy(pkt->data, start_sequence, sizeof(start_sequence));
+                    /* A/V packet: copy new NAL header */
+                    memcpy(pkt->data + sizeof(start_sequence), new_nal_header, sizeof(new_nal_header));
+                    /* A/V packet: copy NAL unit data */
+                    memcpy(pkt->data + sizeof(start_sequence) + sizeof(new_nal_header), buf, len);
+                } else {
+                    av_log(ctx, AV_LOG_ERROR, "Illegal combination of S and E bit in RTP/HEVC packet\n");
+                    res = AVERROR_INVALIDDATA;
+                }
+            } else {
+                /* create A/V packet */
+                if ((res = av_new_packet(pkt, len)) < 0)
+                    return res;
+                /* A/V packet: copy NAL unit data */
+                memcpy(pkt->data, buf, len);
+            }
+        } else {
+            /* sanity check for size of input packet: 1 byte payload at least */
+            av_log(ctx, AV_LOG_ERROR,
+                   "Too short RTP/HEVC packet, got %d bytes of NAL unit type %d\n",
+                   len, nal_type);
+            res = AVERROR_INVALIDDATA;
+        }
+
+        break;
+    /* PACI packet */
+    case 50:
+        /* Temporal scalability control information (TSCI) */
+        avpriv_report_missing_feature(ctx, "PACI packets for RTP/HEVC\n");
+        res = AVERROR_PATCHWELCOME;
+        break;
+    }
+
+    pkt->stream_index = st->index;
+
+    return res;
+}
+
+RTPDynamicProtocolHandler ff_hevc_dynamic_handler = {
+    .enc_name         = "HEVC",
+    .codec_type       = AVMEDIA_TYPE_VIDEO,
+    .codec_id         = AV_CODEC_ID_HEVC,
+    .init             = hevc_init,
+    .parse_sdp_a_line = hevc_parse_sdp_line,
+    .alloc            = hevc_new_context,
+    .free             = hevc_free_context,
+    .parse_packet     = hevc_handle_packet
+};
+
+RTPDynamicProtocolHandler ff_h265_dynamic_handler = {
+    .enc_name         = "H265",
+    .codec_type       = AVMEDIA_TYPE_VIDEO,
+    .codec_id         = AV_CODEC_ID_HEVC,
+    .init             = hevc_init,
+    .parse_sdp_a_line = hevc_parse_sdp_line,
+    .alloc            = hevc_new_context,
+    .free             = hevc_free_context,
+    .parse_packet     = hevc_handle_packet
+};