/*
- * RTP H264 Protocol (RFC3984)
+ * RTP H.264 Protocol (RFC3984)
* Copyright (c) 2006 Ryan Martell
*
* This file is part of Libav.
*/
/**
-* @file
+ * @file
* @brief H.264 / RTP Code (RFC3984)
* @author Ryan Martell <rdm4@martellventures.com>
*
* 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)
- *
- * @note TODO:
- * 1) RTCP sender reports for udp streams are required..
- *
+ * Interleaved Mode (2). (This requires implementing STAP-B, MTAP16, MTAP24,
+ * FU-B packet types)
*/
+#include "libavutil/attributes.h"
#include "libavutil/base64.h"
+#include "libavutil/intreadwrite.h"
#include "libavutil/avstring.h"
-#include "libavcodec/get_bits.h"
#include "avformat.h"
-#include "mpegts.h"
-
-#include <unistd.h>
-#include "network.h"
-#include <assert.h>
#include "rtpdec.h"
#include "rtpdec_formats.h"
-/**
- RTP/H264 specific private data.
-*/
struct PayloadContext {
- unsigned long cookie; ///< sanity check, to make sure we get the pointer we're expecting.
-
- //sdp setup parameters
- uint8_t profile_idc; ///< from the sdp setup parameters.
- uint8_t profile_iop; ///< from the sdp setup parameters.
- uint8_t level_idc; ///< from the sdp setup parameters.
- int packetization_mode; ///< from the sdp setup parameters.
+ // sdp setup parameters
+ uint8_t profile_idc;
+ uint8_t profile_iop;
+ uint8_t level_idc;
+ int packetization_mode;
#ifdef DEBUG
int packet_types_received[32];
#endif
};
-#define MAGIC_COOKIE (0xdeadbeef) ///< Cookie for the extradata; to verify we are what we think we are, and that we haven't been freed.
-#define DEAD_COOKIE (0xdeaddead) ///< Cookie for the extradata; once it is freed.
+#ifdef DEBUG
+#define COUNT_NAL_TYPE(data, nal) data->packet_types_received[(nal) & 0x1f]++
+#define NAL_COUNTERS data->packet_types_received
+#else
+#define COUNT_NAL_TYPE(data, nal) do { } while (0)
+#define NAL_COUNTERS NULL
+#endif
+#define NAL_MASK 0x1f
+
+static const uint8_t start_sequence[] = { 0, 0, 0, 1 };
+
+static void parse_profile_level_id(AVFormatContext *s,
+ PayloadContext *h264_data,
+ const char *value)
+{
+ char buffer[3];
+ // 6 characters=3 bytes, in hex.
+ uint8_t profile_idc;
+ uint8_t profile_iop;
+ uint8_t level_idc;
+
+ buffer[0] = value[0];
+ buffer[1] = value[1];
+ buffer[2] = '\0';
+ profile_idc = strtol(buffer, NULL, 16);
+ buffer[0] = value[2];
+ buffer[1] = value[3];
+ profile_iop = strtol(buffer, NULL, 16);
+ buffer[0] = value[4];
+ buffer[1] = value[5];
+ level_idc = strtol(buffer, NULL, 16);
+
+ av_log(s, AV_LOG_DEBUG,
+ "RTP Profile IDC: %x Profile IOP: %x Level: %x\n",
+ profile_idc, profile_iop, level_idc);
+ h264_data->profile_idc = profile_idc;
+ h264_data->profile_iop = profile_iop;
+ h264_data->level_idc = level_idc;
+}
+
+int ff_h264_parse_sprop_parameter_sets(AVFormatContext *s,
+ uint8_t **data_ptr, int *size_ptr,
+ const char *value)
+{
+ char base64packet[1024];
+ uint8_t decoded_packet[1024];
+ int packet_size;
+
+ while (*value) {
+ char *dst = base64packet;
+
+ while (*value && *value != ','
+ && (dst - base64packet) < sizeof(base64packet) - 1) {
+ *dst++ = *value++;
+ }
+ *dst++ = '\0';
+
+ if (*value == ',')
+ value++;
+
+ packet_size = av_base64_decode(decoded_packet, base64packet,
+ sizeof(decoded_packet));
+ if (packet_size > 0) {
+ uint8_t *dest = av_realloc(*data_ptr,
+ packet_size + sizeof(start_sequence) +
+ *size_ptr +
+ AV_INPUT_BUFFER_PADDING_SIZE);
+ if (!dest) {
+ av_log(s, AV_LOG_ERROR,
+ "Unable to allocate memory for extradata!\n");
+ return AVERROR(ENOMEM);
+ }
+ *data_ptr = dest;
+
+ memcpy(dest + *size_ptr, start_sequence,
+ sizeof(start_sequence));
+ memcpy(dest + *size_ptr + sizeof(start_sequence),
+ decoded_packet, packet_size);
+ memset(dest + *size_ptr + sizeof(start_sequence) +
+ packet_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
+
+ *size_ptr += sizeof(start_sequence) + packet_size;
+ }
+ }
+
+ return 0;
+}
-/* ---------------- private code */
-static int sdp_parse_fmtp_config_h264(AVStream * stream,
- PayloadContext * h264_data,
- char *attr, char *value)
+static int sdp_parse_fmtp_config_h264(AVFormatContext *s,
+ AVStream *stream,
+ PayloadContext *h264_data,
+ const char *attr, const char *value)
{
- AVCodecContext *codec = stream->codec;
- assert(codec->codec_id == CODEC_ID_H264);
- assert(h264_data != NULL);
+ AVCodecParameters *par = stream->codecpar;
if (!strcmp(attr, "packetization-mode")) {
- av_log(codec, AV_LOG_DEBUG, "RTP Packetization Mode: %d\n", atoi(value));
+ av_log(s, 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,
- "Interleaved RTP mode is not supported yet.");
+ av_log(s, AV_LOG_ERROR,
+ "Interleaved RTP mode is not supported yet.\n");
} else if (!strcmp(attr, "profile-level-id")) {
- if (strlen(value) == 6) {
- char buffer[3];
- // 6 characters=3 bytes, in hex.
- uint8_t profile_idc;
- uint8_t profile_iop;
- uint8_t level_idc;
-
- buffer[0] = value[0]; buffer[1] = value[1]; buffer[2] = '\0';
- profile_idc = strtol(buffer, NULL, 16);
- buffer[0] = value[2]; buffer[1] = value[3];
- profile_iop = strtol(buffer, NULL, 16);
- buffer[0] = value[4]; buffer[1] = value[5];
- level_idc = strtol(buffer, NULL, 16);
-
- // set the parameters...
- av_log(codec, AV_LOG_DEBUG,
- "RTP Profile IDC: %x Profile IOP: %x Level: %x\n",
- profile_idc, profile_iop, level_idc);
- h264_data->profile_idc = profile_idc;
- h264_data->profile_iop = profile_iop;
- h264_data->level_idc = level_idc;
- }
- } else if (!strcmp(attr, "sprop-parameter-sets")) {
- uint8_t start_sequence[]= { 0, 0, 1 };
- codec->extradata_size= 0;
- codec->extradata= NULL;
-
- while (*value) {
- char base64packet[1024];
- uint8_t decoded_packet[1024];
- int packet_size;
- char *dst = base64packet;
-
- while (*value && *value != ','
- && (dst - base64packet) < sizeof(base64packet) - 1) {
- *dst++ = *value++;
- }
- *dst++ = '\0';
-
- if (*value == ',')
- value++;
-
- packet_size= av_base64_decode(decoded_packet, base64packet, sizeof(decoded_packet));
- if (packet_size > 0) {
- uint8_t *dest = av_malloc(packet_size + sizeof(start_sequence) +
- codec->extradata_size +
- FF_INPUT_BUFFER_PADDING_SIZE);
- if(dest)
- {
- if(codec->extradata_size)
- {
- // av_realloc?
- memcpy(dest, codec->extradata, codec->extradata_size);
- av_free(codec->extradata);
- }
-
- memcpy(dest+codec->extradata_size, start_sequence, sizeof(start_sequence));
- memcpy(dest+codec->extradata_size+sizeof(start_sequence), decoded_packet, packet_size);
- memset(dest+codec->extradata_size+sizeof(start_sequence)+
- packet_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
-
- codec->extradata= dest;
- codec->extradata_size+= sizeof(start_sequence)+packet_size;
+ if (strlen(value) == 6)
+ parse_profile_level_id(s, h264_data, value);
+ } else if (!strcmp(attr, "sprop-parameter-sets")) {
+ int ret;
+ par->extradata_size = 0;
+ av_freep(&par->extradata);
+ ret = ff_h264_parse_sprop_parameter_sets(s, &par->extradata,
+ &par->extradata_size, value);
+ av_log(s, AV_LOG_DEBUG, "Extradata set to %p (size: %d)\n",
+ par->extradata, par->extradata_size);
+ return ret;
+ }
+ return 0;
+}
+
+void ff_h264_parse_framesize(AVCodecParameters *par, const char *p)
+{
+ char buf1[50];
+ char *dst = buf1;
+
+ // remove the protocol identifier
+ while (*p && *p == ' ')
+ p++; // strip spaces.
+ while (*p && *p != ' ')
+ p++; // eat protocol identifier
+ while (*p && *p == ' ')
+ p++; // strip trailing spaces.
+ while (*p && *p != '-' && (dst - buf1) < sizeof(buf1) - 1)
+ *dst++ = *p++;
+ *dst = '\0';
+
+ // a='framesize:96 320-240'
+ // set our parameters
+ par->width = atoi(buf1);
+ par->height = atoi(p + 1); // skip the -
+}
+
+int ff_h264_handle_aggregated_packet(AVFormatContext *ctx, AVPacket *pkt,
+ const uint8_t *buf, int len,
+ int skip_between, int *nal_counters,
+ int nal_mask)
+{
+ int pass = 0;
+ int total_length = 0;
+ uint8_t *dst = NULL;
+ int ret;
+
+ // first we are going to figure out the total size
+ for (pass = 0; pass < 2; pass++) {
+ const uint8_t *src = buf;
+ int src_len = len;
+
+ while (src_len > 2) {
+ uint16_t nal_size = AV_RB16(src);
+
+ // consume the length of the aggregate
+ src += 2;
+ src_len -= 2;
+
+ if (nal_size <= src_len) {
+ if (pass == 0) {
+ // counting
+ total_length += sizeof(start_sequence) + nal_size;
} else {
- av_log(codec, AV_LOG_ERROR, "Unable to allocate memory for extradata!");
- return AVERROR(ENOMEM);
+ // copying
+ memcpy(dst, start_sequence, sizeof(start_sequence));
+ dst += sizeof(start_sequence);
+ memcpy(dst, src, nal_size);
+ if (nal_counters)
+ nal_counters[(*src) & nal_mask]++;
+ dst += nal_size;
}
+ } else {
+ av_log(ctx, AV_LOG_ERROR,
+ "nal size exceeds length: %d %d\n", nal_size, src_len);
+ return AVERROR_INVALIDDATA;
}
+
+ // eat what we handled
+ src += nal_size + skip_between;
+ src_len -= nal_size + skip_between;
+ }
+
+ if (pass == 0) {
+ /* now we know the total size of the packet (with the
+ * start sequences added) */
+ if ((ret = av_new_packet(pkt, total_length)) < 0)
+ return ret;
+ dst = pkt->data;
}
- av_log(codec, AV_LOG_DEBUG, "Extradata set to %p (size: %d)!", codec->extradata, codec->extradata_size);
}
+
+ return 0;
+}
+
+int ff_h264_handle_frag_packet(AVPacket *pkt, const uint8_t *buf, int len,
+ int start_bit, const uint8_t *nal_header,
+ int nal_header_len)
+{
+ int ret;
+ int tot_len = len;
+ int pos = 0;
+ if (start_bit)
+ tot_len += sizeof(start_sequence) + nal_header_len;
+ if ((ret = av_new_packet(pkt, tot_len)) < 0)
+ return ret;
+ if (start_bit) {
+ memcpy(pkt->data + pos, start_sequence, sizeof(start_sequence));
+ pos += sizeof(start_sequence);
+ memcpy(pkt->data + pos, nal_header, nal_header_len);
+ pos += nal_header_len;
+ }
+ memcpy(pkt->data + pos, buf, len);
return 0;
}
-// 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,
- AVPacket * pkt,
- uint32_t * timestamp,
- const uint8_t * buf,
- int len, int flags)
+static int h264_handle_packet_fu_a(AVFormatContext *ctx, AVPacket *pkt,
+ const uint8_t *buf, int len,
+ int *nal_counters, int nal_mask)
{
- uint8_t nal = buf[0];
- uint8_t type = (nal & 0x1f);
- int result= 0;
- uint8_t start_sequence[]= {0, 0, 1};
+ uint8_t fu_indicator, fu_header, start_bit, nal_type, nal;
-#ifdef DEBUG
- assert(data);
- assert(data->cookie == MAGIC_COOKIE);
-#endif
- assert(buf);
+ if (len < 3) {
+ av_log(ctx, AV_LOG_ERROR, "Too short data for FU-A H.264 RTP packet\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ fu_indicator = buf[0];
+ fu_header = buf[1];
+ start_bit = fu_header >> 7;
+ nal_type = fu_header & 0x1f;
+ nal = fu_indicator & 0xe0 | nal_type;
+
+ // skip the fu_indicator and fu_header
+ buf += 2;
+ len -= 2;
+
+ if (start_bit && nal_counters)
+ nal_counters[nal_type & nal_mask]++;
+ return ff_h264_handle_frag_packet(pkt, buf, len, start_bit, &nal, 1);
+}
+
+// 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, AVPacket *pkt, uint32_t *timestamp,
+ const uint8_t *buf, int len, uint16_t seq,
+ int flags)
+{
+ uint8_t nal;
+ uint8_t type;
+ int result = 0;
+ if (!len) {
+ av_log(ctx, AV_LOG_ERROR, "Empty H.264 RTP packet\n");
+ return AVERROR_INVALIDDATA;
+ }
+ nal = buf[0];
+ type = nal & 0x1f;
+
+ /* Simplify the case (these are all the NAL types used internally by
+ * the H.264 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:
- av_new_packet(pkt, len+sizeof(start_sequence));
+ if ((result = av_new_packet(pkt, len + sizeof(start_sequence))) < 0)
+ return result;
memcpy(pkt->data, start_sequence, sizeof(start_sequence));
- memcpy(pkt->data+sizeof(start_sequence), buf, len);
-#ifdef DEBUG
- data->packet_types_received[nal & 0x1f]++;
-#endif
+ memcpy(pkt->data + sizeof(start_sequence), buf, len);
+ COUNT_NAL_TYPE(data, nal);
break;
case 24: // STAP-A (one packet, multiple nals)
// consume the STAP-A NAL
buf++;
len--;
- // first we are going to figure out the total size....
- {
- int pass= 0;
- int total_length= 0;
- uint8_t *dst= NULL;
-
- for(pass= 0; pass<2; pass++) {
- const uint8_t *src= buf;
- int src_len= len;
-
- do {
- uint16_t nal_size = AV_RB16(src); // this going to be a problem if unaligned (can it be?)
-
- // consume the length of the aggregate...
- src += 2;
- src_len -= 2;
-
- if (nal_size <= src_len) {
- if(pass==0) {
- // counting...
- total_length+= sizeof(start_sequence)+nal_size;
- } else {
- // copying
- assert(dst);
- memcpy(dst, start_sequence, sizeof(start_sequence));
- dst+= sizeof(start_sequence);
- memcpy(dst, src, nal_size);
-#ifdef DEBUG
- data->packet_types_received[*src & 0x1f]++;
-#endif
- dst+= nal_size;
- }
- } else {
- av_log(ctx, AV_LOG_ERROR,
- "nal size exceeds length: %d %d\n", nal_size, src_len);
- }
-
- // eat what we handled...
- src += nal_size;
- src_len -= nal_size;
-
- if (src_len < 0)
- av_log(ctx, AV_LOG_ERROR,
- "Consumed more bytes than we got! (%d)\n", src_len);
- } while (src_len > 2); // because there could be rtp padding..
-
- if(pass==0) {
- // now we know the total size of the packet (with the start sequences added)
- av_new_packet(pkt, total_length);
- dst= pkt->data;
- } else {
- assert(dst-pkt->data==total_length);
- }
- }
- }
+ result = ff_h264_handle_aggregated_packet(ctx, pkt, buf, len, 0,
+ NAL_COUNTERS, NAL_MASK);
break;
case 25: // STAP-B
case 26: // MTAP-16
case 27: // MTAP-24
case 29: // FU-B
- av_log(ctx, AV_LOG_ERROR,
- "Unhandled type (%d) (See RFC for implementation details\n",
- type);
- result= -1;
+ avpriv_report_missing_feature(ctx, "RTP H.264 NAL unit type %d", type);
+ result = AVERROR_PATCHWELCOME;
break;
case 28: // FU-A (fragmented nal)
- buf++;
- len--; // skip the fu_indicator
- {
- // these are the same as above, we just redo them here for clarity...
- uint8_t fu_indicator = nal;
- uint8_t fu_header = *buf; // read the fu_header.
- uint8_t start_bit = fu_header >> 7;
-// uint8_t end_bit = (fu_header & 0x40) >> 6;
- 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;
- reconstructed_nal |= nal_type;
-
- // skip the fu_header...
- buf++;
- len--;
-
-#ifdef DEBUG
- if (start_bit)
- data->packet_types_received[nal_type]++;
-#endif
- if(start_bit) {
- // 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;
- memcpy(pkt->data+sizeof(start_sequence)+sizeof(nal), buf, len);
- } else {
- av_new_packet(pkt, len);
- memcpy(pkt->data, buf, len);
- }
- }
+ result = h264_handle_packet_fu_a(ctx, pkt, buf, len,
+ NAL_COUNTERS, NAL_MASK);
break;
case 30: // undefined
case 31: // undefined
default:
- av_log(ctx, AV_LOG_ERROR, "Undefined type (%d)", type);
- result= -1;
+ av_log(ctx, AV_LOG_ERROR, "Undefined type (%d)\n", type);
+ result = AVERROR_INVALIDDATA;
break;
}
return result;
}
-/* ---------------- public code */
-static PayloadContext *h264_new_context(void)
-{
- PayloadContext *data =
- av_mallocz(sizeof(PayloadContext) +
- FF_INPUT_BUFFER_PADDING_SIZE);
-
- if (data) {
- data->cookie = MAGIC_COOKIE;
- }
-
- return data;
-}
-
-static void h264_free_context(PayloadContext *data)
+static void h264_close_context(PayloadContext *data)
{
#ifdef DEBUG
int ii;
data->packet_types_received[ii], ii);
}
#endif
-
- assert(data);
- assert(data->cookie == MAGIC_COOKIE);
-
- // avoid stale pointers (assert)
- data->cookie = DEAD_COOKIE;
-
- // and clear out this...
- av_free(data);
}
static int parse_h264_sdp_line(AVFormatContext *s, int st_index,
PayloadContext *h264_data, const char *line)
{
- AVStream *stream = s->streams[st_index];
- AVCodecContext *codec = stream->codec;
+ AVStream *stream;
const char *p = line;
- assert(h264_data->cookie == MAGIC_COOKIE);
+ if (st_index < 0)
+ return 0;
- if (av_strstart(p, "framesize:", &p)) {
- char buf1[50];
- char *dst = buf1;
-
- // remove the protocol identifier..
- while (*p && *p == ' ') p++; // strip spaces.
- while (*p && *p != ' ') p++; // eat protocol identifier
- while (*p && *p == ' ') p++; // strip trailing spaces.
- while (*p && *p != '-' && (dst - buf1) < sizeof(buf1) - 1) {
- *dst++ = *p++;
- }
- *dst = '\0';
+ stream = s->streams[st_index];
- // a='framesize:96 320-240'
- // set our parameters..
- codec->width = atoi(buf1);
- codec->height = atoi(p + 1); // skip the -
- codec->pix_fmt = PIX_FMT_YUV420P;
+ if (av_strstart(p, "framesize:", &p)) {
+ ff_h264_parse_framesize(stream->codecpar, p);
} else if (av_strstart(p, "fmtp:", &p)) {
- return ff_parse_fmtp(stream, h264_data, p, sdp_parse_fmtp_config_h264);
+ return ff_parse_fmtp(s, stream, h264_data, p, sdp_parse_fmtp_config_h264);
} else if (av_strstart(p, "cliprect:", &p)) {
// could use this if we wanted.
}
- return 0; // keep processing it the normal way...
+ return 0;
}
-/**
-This is the structure for expanding on the dynamic rtp protocols (makes everything static. yay!)
-*/
RTPDynamicProtocolHandler ff_h264_dynamic_handler = {
.enc_name = "H264",
.codec_type = AVMEDIA_TYPE_VIDEO,
- .codec_id = CODEC_ID_H264,
+ .codec_id = AV_CODEC_ID_H264,
+ .need_parsing = AVSTREAM_PARSE_FULL,
+ .priv_data_size = sizeof(PayloadContext),
.parse_sdp_a_line = parse_h264_sdp_line,
- .alloc = h264_new_context,
- .free = h264_free_context,
- .parse_packet = h264_handle_packet
+ .close = h264_close_context,
+ .parse_packet = h264_handle_packet,
};
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