451 lines
16 KiB
C
451 lines
16 KiB
C
/*
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* RTP parser for HEVC/H.265 payload format (draft version 6)
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* Copyright (c) 2014 Thomas Volkert <thomas@homer-conferencing.com>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/base64.h"
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#include "avformat.h"
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#include "rtpdec.h"
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#define RTP_HEVC_PAYLOAD_HEADER_SIZE 2
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#define RTP_HEVC_FU_HEADER_SIZE 1
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#define RTP_HEVC_DONL_FIELD_SIZE 2
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#define HEVC_SPECIFIED_NAL_UNIT_TYPES 48
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/* SDP out-of-band signaling data */
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struct PayloadContext {
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int using_donl_field;
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int profile_id;
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uint8_t *sps, *pps, *vps, *sei;
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int sps_size, pps_size, vps_size, sei_size;
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};
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static const uint8_t start_sequence[] = { 0x00, 0x00, 0x00, 0x01 };
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static av_cold PayloadContext *hevc_new_context(void)
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{
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return av_mallocz(sizeof(PayloadContext));
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}
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static av_cold void hevc_free_context(PayloadContext *data)
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{
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av_free(data);
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}
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static av_cold int hevc_init(AVFormatContext *ctx, int st_index,
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PayloadContext *data)
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{
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av_dlog(ctx, "hevc_init() for stream %d\n", st_index);
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if (st_index < 0)
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return 0;
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ctx->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL;
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return 0;
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}
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static av_cold int hevc_sdp_parse_fmtp_config(AVFormatContext *s,
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AVStream *stream,
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PayloadContext *hevc_data,
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char *attr, char *value)
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{
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/* profile-space: 0-3 */
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/* profile-id: 0-31 */
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if (!strcmp(attr, "profile-id")) {
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hevc_data->profile_id = atoi(value);
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av_dlog(s, "SDP: found profile-id: %d\n", hevc_data->profile_id);
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}
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/* tier-flag: 0-1 */
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/* level-id: 0-255 */
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/* interop-constraints: [base16] */
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/* profile-compatibility-indicator: [base16] */
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/* sprop-sub-layer-id: 0-6, defines highest possible value for TID, default: 6 */
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/* recv-sub-layer-id: 0-6 */
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/* max-recv-level-id: 0-255 */
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/* tx-mode: MSM,SSM */
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/* sprop-vps: [base64] */
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/* sprop-sps: [base64] */
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/* sprop-pps: [base64] */
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/* sprop-sei: [base64] */
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if (!strcmp(attr, "sprop-vps") || !strcmp(attr, "sprop-sps") ||
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!strcmp(attr, "sprop-pps") || !strcmp(attr, "sprop-sei")) {
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uint8_t **data_ptr;
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int *size_ptr;
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if (!strcmp(attr, "sprop-vps")) {
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data_ptr = &hevc_data->vps;
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size_ptr = &hevc_data->vps_size;
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} else if (!strcmp(attr, "sprop-sps")) {
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data_ptr = &hevc_data->sps;
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size_ptr = &hevc_data->sps_size;
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} else if (!strcmp(attr, "sprop-pps")) {
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data_ptr = &hevc_data->pps;
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size_ptr = &hevc_data->pps_size;
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} else if (!strcmp(attr, "sprop-sei")) {
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data_ptr = &hevc_data->sei;
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size_ptr = &hevc_data->sei_size;
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}
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while (*value) {
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char base64packet[1024];
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uint8_t decoded_packet[1024];
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int decoded_packet_size;
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char *dst = base64packet;
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while (*value && *value != ',' &&
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(dst - base64packet) < sizeof(base64packet) - 1) {
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*dst++ = *value++;
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}
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*dst++ = '\0';
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if (*value == ',')
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value++;
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decoded_packet_size = av_base64_decode(decoded_packet, base64packet,
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sizeof(decoded_packet));
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if (decoded_packet_size > 0) {
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uint8_t *tmp = av_realloc(*data_ptr, decoded_packet_size +
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sizeof(start_sequence) + *size_ptr);
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if (!tmp) {
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av_log(s, AV_LOG_ERROR,
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"Unable to allocate memory for extradata!\n");
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return AVERROR(ENOMEM);
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}
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*data_ptr = tmp;
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memcpy(*data_ptr + *size_ptr, start_sequence,
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sizeof(start_sequence));
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memcpy(*data_ptr + *size_ptr + sizeof(start_sequence),
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decoded_packet, decoded_packet_size);
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*size_ptr += sizeof(start_sequence) + decoded_packet_size;
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}
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}
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}
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/* max-lsr, max-lps, max-cpb, max-dpb, max-br, max-tr, max-tc */
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/* max-fps */
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/* sprop-max-don-diff: 0-32767
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When the RTP stream depends on one or more other RTP
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streams (in this case tx-mode MUST be equal to "MSM" and
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MSM is in use), this parameter MUST be present and the
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value MUST be greater than 0.
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*/
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if (!strcmp(attr, "sprop-max-don-diff")) {
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if (atoi(value) > 0)
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hevc_data->using_donl_field = 1;
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av_dlog(s, "Found sprop-max-don-diff in SDP, DON field usage is: %d\n",
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hevc_data->using_donl_field);
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}
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/* sprop-depack-buf-nalus: 0-32767 */
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if (!strcmp(attr, "sprop-depack-buf-nalus")) {
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if (atoi(value) > 0)
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hevc_data->using_donl_field = 1;
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av_dlog(s, "Found sprop-depack-buf-nalus in SDP, DON field usage is: %d\n",
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hevc_data->using_donl_field);
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}
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/* sprop-depack-buf-bytes: 0-4294967295 */
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/* depack-buf-cap */
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/* sprop-segmentation-id: 0-3 */
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/* sprop-spatial-segmentation-idc: [base16] */
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/* dec-parallel-ca: */
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/* include-dph */
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return 0;
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}
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static av_cold int hevc_parse_sdp_line(AVFormatContext *ctx, int st_index,
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PayloadContext *hevc_data, const char *line)
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{
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AVStream *current_stream;
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AVCodecContext *codec;
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const char *sdp_line_ptr = line;
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if (st_index < 0)
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return 0;
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current_stream = ctx->streams[st_index];
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codec = current_stream->codec;
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if (av_strstart(sdp_line_ptr, "framesize:", &sdp_line_ptr)) {
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char str_video_width[50];
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char *str_video_width_ptr = str_video_width;
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/*
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* parse "a=framesize:96 320-240"
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*/
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/* ignore spaces */
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while (*sdp_line_ptr && *sdp_line_ptr == ' ')
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sdp_line_ptr++;
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/* ignore RTP payload ID */
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while (*sdp_line_ptr && *sdp_line_ptr != ' ')
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sdp_line_ptr++;
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/* ignore spaces */
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while (*sdp_line_ptr && *sdp_line_ptr == ' ')
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sdp_line_ptr++;
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/* extract the actual video resolution description */
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while (*sdp_line_ptr && *sdp_line_ptr != '-' &&
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(str_video_width_ptr - str_video_width) < sizeof(str_video_width) - 1)
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*str_video_width_ptr++ = *sdp_line_ptr++;
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/* add trailing zero byte */
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*str_video_width_ptr = '\0';
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/* determine the width value */
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codec->width = atoi(str_video_width);
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/* jump beyond the "-" and determine the height value */
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codec->height = atoi(sdp_line_ptr + 1);
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} else if (av_strstart(sdp_line_ptr, "fmtp:", &sdp_line_ptr)) {
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int ret = ff_parse_fmtp(ctx, current_stream, hevc_data, sdp_line_ptr,
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hevc_sdp_parse_fmtp_config);
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if (hevc_data->vps_size || hevc_data->sps_size ||
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hevc_data->pps_size || hevc_data->sei_size) {
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av_freep(&codec->extradata);
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codec->extradata_size = hevc_data->vps_size + hevc_data->sps_size +
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hevc_data->pps_size + hevc_data->sei_size;
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codec->extradata = av_malloc(codec->extradata_size +
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FF_INPUT_BUFFER_PADDING_SIZE);
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if (!codec->extradata) {
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ret = AVERROR(ENOMEM);
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codec->extradata_size = 0;
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} else {
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int pos = 0;
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memcpy(codec->extradata + pos, hevc_data->vps, hevc_data->vps_size);
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pos += hevc_data->vps_size;
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memcpy(codec->extradata + pos, hevc_data->sps, hevc_data->sps_size);
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pos += hevc_data->sps_size;
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memcpy(codec->extradata + pos, hevc_data->pps, hevc_data->pps_size);
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pos += hevc_data->pps_size;
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memcpy(codec->extradata + pos, hevc_data->sei, hevc_data->sei_size);
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pos += hevc_data->sei_size;
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memset(codec->extradata + pos, 0, FF_INPUT_BUFFER_PADDING_SIZE);
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}
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av_freep(&hevc_data->vps);
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av_freep(&hevc_data->sps);
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av_freep(&hevc_data->pps);
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av_freep(&hevc_data->sei);
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hevc_data->vps_size = 0;
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hevc_data->sps_size = 0;
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hevc_data->pps_size = 0;
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hevc_data->sei_size = 0;
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}
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return ret;
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}
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return 0;
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}
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static int hevc_handle_packet(AVFormatContext *ctx, PayloadContext *rtp_hevc_ctx,
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AVStream *st, AVPacket *pkt, uint32_t *timestamp,
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const uint8_t *buf, int len, uint16_t seq,
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int flags)
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{
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const uint8_t *rtp_pl = buf;
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int tid, lid, nal_type;
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int first_fragment, last_fragment, fu_type;
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uint8_t new_nal_header[2];
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int res = 0;
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/* sanity check for size of input packet: 1 byte payload at least */
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if (len < RTP_HEVC_PAYLOAD_HEADER_SIZE + 1) {
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av_log(ctx, AV_LOG_ERROR, "Too short RTP/HEVC packet, got %d bytes\n", len);
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return AVERROR_INVALIDDATA;
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}
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/*
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decode the HEVC payload header according to section 4 of draft version 6:
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0 1
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0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|F| Type | LayerId | TID |
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+-------------+-----------------+
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Forbidden zero (F): 1 bit
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NAL unit type (Type): 6 bits
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NUH layer ID (LayerId): 6 bits
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NUH temporal ID plus 1 (TID): 3 bits
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*/
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nal_type = (buf[0] >> 1) & 0x3f;
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lid = ((buf[0] << 5) & 0x20) | ((buf[1] >> 3) & 0x1f);
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tid = buf[1] & 0x07;
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/* sanity check for correct layer ID */
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if (lid) {
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/* future scalable or 3D video coding extensions */
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avpriv_report_missing_feature(ctx, "Multi-layer HEVC coding\n");
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return AVERROR_PATCHWELCOME;
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}
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/* sanity check for correct temporal ID */
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if (!tid) {
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av_log(ctx, AV_LOG_ERROR, "Illegal temporal ID in RTP/HEVC packet\n");
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return AVERROR_INVALIDDATA;
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}
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/* sanity check for correct NAL unit type */
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if (nal_type > 50) {
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av_log(ctx, AV_LOG_ERROR, "Unsupported (HEVC) NAL type (%d)\n", nal_type);
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return AVERROR_INVALIDDATA;
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}
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switch (nal_type) {
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/* aggregated packets (AP) */
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case 48:
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/* pass the HEVC payload header */
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buf += RTP_HEVC_PAYLOAD_HEADER_SIZE;
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len -= RTP_HEVC_PAYLOAD_HEADER_SIZE;
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/* pass the HEVC DONL field */
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if (rtp_hevc_ctx->using_donl_field) {
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buf += RTP_HEVC_DONL_FIELD_SIZE;
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len -= RTP_HEVC_DONL_FIELD_SIZE;
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}
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/* fall-through */
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/* video parameter set (VPS) */
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case 32:
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/* sequence parameter set (SPS) */
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case 33:
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/* picture parameter set (PPS) */
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case 34:
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/* supplemental enhancement information (SEI) */
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case 39:
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/* single NAL unit packet */
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default:
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/* sanity check for size of input packet: 1 byte payload at least */
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if (len < 1) {
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av_log(ctx, AV_LOG_ERROR,
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"Too short RTP/HEVC packet, got %d bytes of NAL unit type %d\n",
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len, nal_type);
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return AVERROR_INVALIDDATA;
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}
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/* create A/V packet */
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if ((res = av_new_packet(pkt, sizeof(start_sequence) + len)) < 0)
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return res;
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/* A/V packet: copy start sequence */
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memcpy(pkt->data, start_sequence, sizeof(start_sequence));
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/* A/V packet: copy NAL unit data */
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memcpy(pkt->data + sizeof(start_sequence), buf, len);
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break;
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/* fragmentation unit (FU) */
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case 49:
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/* pass the HEVC payload header */
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buf += RTP_HEVC_PAYLOAD_HEADER_SIZE;
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len -= RTP_HEVC_PAYLOAD_HEADER_SIZE;
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/*
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decode the FU header
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0 1 2 3 4 5 6 7
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+-+-+-+-+-+-+-+-+
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|S|E| FuType |
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+---------------+
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Start fragment (S): 1 bit
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End fragment (E): 1 bit
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FuType: 6 bits
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*/
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first_fragment = buf[0] & 0x80;
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last_fragment = buf[0] & 0x40;
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fu_type = buf[0] & 0x3f;
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/* pass the HEVC FU header */
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buf += RTP_HEVC_FU_HEADER_SIZE;
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len -= RTP_HEVC_FU_HEADER_SIZE;
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/* pass the HEVC DONL field */
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if (rtp_hevc_ctx->using_donl_field) {
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buf += RTP_HEVC_DONL_FIELD_SIZE;
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len -= RTP_HEVC_DONL_FIELD_SIZE;
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}
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av_dlog(ctx, " FU type %d with %d bytes\n", fu_type, len);
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if (len > 0) {
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new_nal_header[0] = (rtp_pl[0] & 0x81) | (fu_type << 1);
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new_nal_header[1] = rtp_pl[1];
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/* start fragment vs. subsequent fragments */
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if (first_fragment) {
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if (!last_fragment) {
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/* create A/V packet which is big enough */
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if ((res = av_new_packet(pkt, sizeof(start_sequence) + sizeof(new_nal_header) + len)) < 0)
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return res;
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/* A/V packet: copy start sequence */
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memcpy(pkt->data, start_sequence, sizeof(start_sequence));
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/* A/V packet: copy new NAL header */
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memcpy(pkt->data + sizeof(start_sequence), new_nal_header, sizeof(new_nal_header));
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/* A/V packet: copy NAL unit data */
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memcpy(pkt->data + sizeof(start_sequence) + sizeof(new_nal_header), buf, len);
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} else {
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av_log(ctx, AV_LOG_ERROR, "Illegal combination of S and E bit in RTP/HEVC packet\n");
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res = AVERROR_INVALIDDATA;
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}
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} else {
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/* create A/V packet */
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if ((res = av_new_packet(pkt, len)) < 0)
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return res;
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/* A/V packet: copy NAL unit data */
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memcpy(pkt->data, buf, len);
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}
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} else {
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/* sanity check for size of input packet: 1 byte payload at least */
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av_log(ctx, AV_LOG_ERROR,
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"Too short RTP/HEVC packet, got %d bytes of NAL unit type %d\n",
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len, nal_type);
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res = AVERROR_INVALIDDATA;
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}
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break;
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/* PACI packet */
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case 50:
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/* Temporal scalability control information (TSCI) */
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avpriv_report_missing_feature(ctx, "PACI packets for RTP/HEVC\n");
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res = AVERROR_PATCHWELCOME;
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break;
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}
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pkt->stream_index = st->index;
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return res;
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}
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RTPDynamicProtocolHandler ff_hevc_dynamic_handler = {
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.enc_name = "H265",
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.codec_type = AVMEDIA_TYPE_VIDEO,
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.codec_id = AV_CODEC_ID_HEVC,
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.init = hevc_init,
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.parse_sdp_a_line = hevc_parse_sdp_line,
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.alloc = hevc_new_context,
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.free = hevc_free_context,
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.parse_packet = hevc_handle_packet
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};
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