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authorJosh Allmann <joshua.allmann@gmail.com>2010-03-22 16:26:29 +0000
committerMartin Storsjö <martin@martin.st>2010-03-22 16:26:29 +0000
commit887af2aa125dd345a51eb5470c5c013327a214d6 (patch)
tree3a770cc329421f8be8cc7963fcb88254f4fe27b0 /libavformat
parent685e76b5541ca5f5f4aaddc32ad313187314a77d (diff)
downloadffmpeg-887af2aa125dd345a51eb5470c5c013327a214d6.tar.gz
RTP depacketization of Theora
Patch by Josh Allmann (joshua allmann gmail com) Originally committed as revision 22636 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat')
-rw-r--r--libavformat/Makefile1
-rw-r--r--libavformat/avformat.h2
-rw-r--r--libavformat/rtpdec.c2
-rw-r--r--libavformat/rtpdec_theora.c387
-rw-r--r--libavformat/rtpdec_theora.h34
5 files changed, 425 insertions, 1 deletions
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 2a2d12314e..39ac96ce04 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -223,6 +223,7 @@ OBJS-$(CONFIG_SDP_DEMUXER) += rtsp.o \
rtpdec_asf.o \
rtpdec_h263.o \
rtpdec_h264.o \
+ rtpdec_theora.o \
rtpdec_vorbis.o
OBJS-$(CONFIG_SEGAFILM_DEMUXER) += segafilm.o
OBJS-$(CONFIG_SHORTEN_DEMUXER) += raw.o id3v2.o
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 2646373def..58978db669 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -22,7 +22,7 @@
#define AVFORMAT_AVFORMAT_H
#define LIBAVFORMAT_VERSION_MAJOR 52
-#define LIBAVFORMAT_VERSION_MINOR 56
+#define LIBAVFORMAT_VERSION_MINOR 57
#define LIBAVFORMAT_VERSION_MICRO 1
#define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
diff --git a/libavformat/rtpdec.c b/libavformat/rtpdec.c
index d60a5737b1..6ffe1dadac 100644
--- a/libavformat/rtpdec.c
+++ b/libavformat/rtpdec.c
@@ -35,6 +35,7 @@
#include "rtpdec_h263.h"
#include "rtpdec_h264.h"
#include "rtpdec_vorbis.h"
+#include "rtpdec_theora.h"
//#define DEBUG
@@ -69,6 +70,7 @@ void av_register_rtp_dynamic_payload_handlers(void)
ff_register_dynamic_payload_handler(&ff_h263_2000_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_h264_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_vorbis_dynamic_handler);
+ ff_register_dynamic_payload_handler(&ff_theora_dynamic_handler);
ff_register_dynamic_payload_handler(&ff_ms_rtp_asf_pfv_handler);
ff_register_dynamic_payload_handler(&ff_ms_rtp_asf_pfa_handler);
diff --git a/libavformat/rtpdec_theora.c b/libavformat/rtpdec_theora.c
new file mode 100644
index 0000000000..b87a6f7994
--- /dev/null
+++ b/libavformat/rtpdec_theora.c
@@ -0,0 +1,387 @@
+/*
+ * RTP Theora Protocol
+ * Copyright (c) 2010 Josh Allmann
+ *
+ * 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 libavformat/rtpdec_theora.c
+ * @brief Theora / RTP Code
+ * @author Josh Allmann <joshua.allmann@gmail.com>
+ */
+
+#include "libavutil/avstring.h"
+#include "libavutil/base64.h"
+#include "libavcodec/bytestream.h"
+
+#include <assert.h>
+
+#include "rtpdec.h"
+#include "rtpdec_theora.h"
+
+/**
+ * RTP/Theora specific private data.
+ */
+struct PayloadContext {
+ unsigned ident; ///< 24-bit stream configuration identifier
+ uint32_t timestamp;
+ ByteIOContext* fragment; ///< buffer for split payloads
+};
+
+static PayloadContext *theora_new_context(void)
+{
+ return av_mallocz(sizeof(PayloadContext));
+}
+
+static inline void free_fragment_if_needed(PayloadContext * data)
+{
+ if (data->fragment) {
+ uint8_t* p;
+ url_close_dyn_buf(data->fragment, &p);
+ av_free(p);
+ data->fragment = NULL;
+ }
+}
+
+static void theora_free_context(PayloadContext * data)
+{
+ free_fragment_if_needed(data);
+ av_free(data);
+}
+
+static int theora_handle_packet(AVFormatContext * ctx,
+ PayloadContext * data,
+ AVStream * st,
+ AVPacket * pkt,
+ uint32_t * timestamp,
+ const uint8_t * buf, int len, int flags)
+{
+
+ int ident, fragmented, tdt, num_pkts, pkt_len;
+
+ if (len < 6) {
+ av_log(ctx, AV_LOG_ERROR, "Invalid %d byte packet\n", len);
+ return AVERROR_INVALIDDATA;
+ }
+
+ // read theora rtp headers
+ ident = AV_RB24(buf);
+ fragmented = buf[3] >> 6;
+ tdt = (buf[3] >> 4) & 3;
+ num_pkts = buf[3] & 7;
+ pkt_len = AV_RB16(buf + 4);
+
+ if (pkt_len > len - 6) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Invalid packet length %d in %d byte packet\n", pkt_len,
+ len);
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (ident != data->ident) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Unimplemented Theora SDP configuration change detected\n");
+ return AVERROR_PATCHWELCOME;
+ }
+
+ if (tdt) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Unimplemented RTP Theora packet settings (%d,%d,%d)\n",
+ fragmented, tdt, num_pkts);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ buf += 6; // move past header bits
+ len -= 6;
+
+ if (fragmented == 0) {
+ // whole frame(s)
+ int i, data_len, write_len;
+ buf -= 2;
+ len += 2;
+
+ // fast first pass to calculate total length
+ for (i = 0, data_len = 0; (i < num_pkts) && (len >= 2); i++) {
+ int off = data_len + (i << 1);
+ pkt_len = AV_RB16(buf + off);
+ data_len += pkt_len;
+ len -= pkt_len + 2;
+ }
+
+ if (len < 0 || i < num_pkts) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Bad packet: %d bytes left at frame %d of %d\n",
+ len, i, num_pkts);
+ return AVERROR_INVALIDDATA;
+ }
+
+ if (av_new_packet(pkt, data_len)) {
+ av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
+ return AVERROR_NOMEM;
+ }
+ pkt->stream_index = st->index;
+
+ // concatenate frames
+ for (i = 0, write_len = 0; write_len < data_len; i++) {
+ pkt_len = AV_RB16(buf);
+ buf += 2;
+ memcpy(pkt->data + write_len, buf, pkt_len);
+ write_len += pkt_len;
+ buf += pkt_len;
+ }
+ assert(write_len == data_len);
+
+ return 0;
+
+ } else if (fragmented == 1) {
+ // start of theora data fragment
+ int res;
+
+ // end packet has been lost somewhere, so drop buffered data
+ free_fragment_if_needed(data);
+
+ if((res = url_open_dyn_buf(&data->fragment)) < 0)
+ return res;
+
+ put_buffer(data->fragment, buf, pkt_len);
+ data->timestamp = *timestamp;
+
+ } else {
+ assert(fragmented < 4);
+ if (data->timestamp != *timestamp) {
+ // skip if fragmented timestamp is incorrect;
+ // a start packet has been lost somewhere
+ free_fragment_if_needed(data);
+ av_log(ctx, AV_LOG_ERROR, "RTP timestamps don't match!\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ // copy data to fragment buffer
+ put_buffer(data->fragment, buf, pkt_len);
+
+ if (fragmented == 3) {
+ // end of theora data packet
+ uint8_t* theora_data;
+ int frame_size = url_close_dyn_buf(data->fragment, &theora_data);
+
+ if (frame_size < 0) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Error occurred when getting fragment buffer.");
+ return frame_size;
+ }
+
+ if (av_new_packet(pkt, frame_size)) {
+ av_log(ctx, AV_LOG_ERROR, "Out of memory.\n");
+ return AVERROR_NOMEM;
+ }
+
+ memcpy(pkt->data, theora_data, frame_size);
+ pkt->stream_index = st->index;
+
+ av_free(theora_data);
+ data->fragment = NULL;
+
+ return 0;
+ }
+ }
+
+ return AVERROR(EAGAIN);
+}
+
+/**
+ * Length encoding described in RFC5215 section 3.1.1.
+ */
+static int get_base128(const uint8_t ** buf, const uint8_t * buf_end)
+{
+ int n = 0;
+ for (; *buf < buf_end; ++*buf) {
+ n <<= 7;
+ n += **buf & 0x7f;
+ if (!(**buf & 0x80)) {
+ ++*buf;
+ return n;
+ }
+ }
+ return 0;
+}
+
+/**
+ * Based off parse_packed_headers in Vorbis RTP
+ */
+static unsigned int
+parse_packed_headers(const uint8_t * packed_headers,
+ const uint8_t * packed_headers_end,
+ AVCodecContext * codec, PayloadContext * theora_data)
+{
+
+ unsigned num_packed, num_headers, length, length1, length2, extradata_alloc;
+ uint8_t *ptr;
+
+ if (packed_headers_end - packed_headers < 9) {
+ av_log(codec, AV_LOG_ERROR,
+ "Invalid %d byte packed header.",
+ packed_headers_end - packed_headers);
+ return AVERROR_INVALIDDATA;
+ }
+
+ num_packed = bytestream_get_be32(&packed_headers);
+ theora_data->ident = bytestream_get_be24(&packed_headers);
+ length = bytestream_get_be16(&packed_headers);
+ num_headers = get_base128(&packed_headers, packed_headers_end);
+ length1 = get_base128(&packed_headers, packed_headers_end);
+ length2 = get_base128(&packed_headers, packed_headers_end);
+
+ if (num_packed != 1 || num_headers > 3) {
+ av_log(codec, AV_LOG_ERROR,
+ "Unimplemented number of headers: %d packed headers, %d headers\n",
+ num_packed, num_headers);
+ return AVERROR_PATCHWELCOME;
+ }
+
+ if (packed_headers_end - packed_headers != length ||
+ length1 > length || length2 > length - length1) {
+ av_log(codec, AV_LOG_ERROR,
+ "Bad packed header lengths (%d,%d,%d,%d)\n", length1,
+ length2, packed_headers_end - packed_headers, length);
+ return AVERROR_INVALIDDATA;
+ }
+
+ /* allocate extra space:
+ * -- length/255 +2 for xiphlacing
+ * -- one for the '2' marker
+ * -- FF_INPUT_BUFFER_PADDING_SIZE required */
+ extradata_alloc = length + length/255 + 3 + FF_INPUT_BUFFER_PADDING_SIZE;
+
+ ptr = codec->extradata = av_malloc(extradata_alloc);
+ if (!ptr) {
+ av_log(codec, AV_LOG_ERROR, "Out of memory\n");
+ return AVERROR_NOMEM;
+ }
+ *ptr++ = 2;
+ ptr += av_xiphlacing(ptr, length1);
+ ptr += av_xiphlacing(ptr, length2);
+ memcpy(ptr, packed_headers, length);
+ ptr += length;
+ codec->extradata_size = ptr - codec->extradata;
+ // clear out remaining parts of the buffer
+ memset(ptr, 0, extradata_alloc - codec->extradata_size);
+
+ return 0;
+}
+
+static int theora_parse_fmtp_pair(AVCodecContext * codec,
+ PayloadContext *theora_data,
+ char *attr, char *value)
+{
+ int result = 0;
+
+ if (!strcmp(attr, "sampling")) {
+ return AVERROR_PATCHWELCOME;
+ } else if (!strcmp(attr, "width")) {
+ /* This is an integer between 1 and 1048561
+ * and MUST be in multiples of 16. */
+ codec->width = atoi(value);
+ return 0;
+ } else if (!strcmp(attr, "height")) {
+ /* This is an integer between 1 and 1048561
+ * and MUST be in multiples of 16. */
+ codec->height = atoi(value);
+ return 0;
+ } else if (!strcmp(attr, "delivery-method")) {
+ /* Possible values are: inline, in_band, out_band/specific_name. */
+ return AVERROR_PATCHWELCOME;
+ } else if (!strcmp(attr, "configuration-uri")) {
+ /* NOTE: configuration-uri is supported only under 2 conditions:
+ *--after the delivery-method tag
+ * --with a delivery-method value of out_band */
+ return AVERROR_PATCHWELCOME;
+ } else if (!strcmp(attr, "configuration")) {
+ /* NOTE: configuration is supported only AFTER the delivery-method tag
+ * The configuration value is a base64 encoded packed header */
+ uint8_t *decoded_packet = NULL;
+ int packet_size;
+ size_t decoded_alloc = strlen(value) / 4 * 3 + 4;
+
+ if (decoded_alloc <= INT_MAX) {
+ decoded_packet = av_malloc(decoded_alloc);
+ if (decoded_packet) {
+ packet_size =
+ av_base64_decode(decoded_packet, value, decoded_alloc);
+
+ result = parse_packed_headers
+ (decoded_packet, decoded_packet + packet_size, codec,
+ theora_data);
+ } else {
+ av_log(codec, AV_LOG_ERROR,
+ "Out of memory while decoding SDP configuration.\n");
+ result = AVERROR_NOMEM;
+ }
+ } else {
+ av_log(codec, AV_LOG_ERROR, "Packet too large\n");
+ result = AVERROR_INVALIDDATA;
+ }
+ av_free(decoded_packet);
+ }
+ return result;
+}
+
+static int theora_parse_sdp_line(AVFormatContext *s, int st_index,
+ PayloadContext *data, const char *line)
+{
+ const char *p;
+ char *value;
+ char attr[25];
+ int value_size = strlen(line), attr_size = sizeof(attr), res = 0;
+ AVCodecContext* codec = s->streams[st_index]->codec;
+
+ assert(codec->id == CODEC_ID_THEORA);
+ assert(data);
+
+ if (!(value = av_malloc(value_size))) {
+ av_log(codec, AV_LOG_ERROR, "Out of memory\n");
+ return AVERROR_NOMEM;
+ }
+
+ 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, attr_size,
+ value, value_size)) {
+ res = theora_parse_fmtp_pair(codec, data, attr, value);
+ if (res < 0 && res != AVERROR_PATCHWELCOME)
+ return res;
+ }
+ }
+
+ av_free(value);
+ return 0;
+}
+
+RTPDynamicProtocolHandler ff_theora_dynamic_handler = {
+ .enc_name = "theora",
+ .codec_type = CODEC_TYPE_VIDEO,
+ .codec_id = CODEC_ID_THEORA,
+ .parse_sdp_a_line = theora_parse_sdp_line,
+ .open = theora_new_context,
+ .close = theora_free_context,
+ .parse_packet = theora_handle_packet
+};
diff --git a/libavformat/rtpdec_theora.h b/libavformat/rtpdec_theora.h
new file mode 100644
index 0000000000..e94c0f1a8e
--- /dev/null
+++ b/libavformat/rtpdec_theora.h
@@ -0,0 +1,34 @@
+/*
+ * RTP Theora Protocol.
+ * Based off RFC 5215 (Vorbis RTP) and the Theora RTP draft.
+ * Copyright (c) 2010 Josh Allmann
+ *
+ * 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
+ */
+
+#ifndef AVFORMAT_RTPDEC_THEORA_H
+#define AVFORMAT_RTPDEC_THEORA_H
+
+#include "libavcodec/avcodec.h"
+#include "rtpdec.h"
+
+/**
+ * Theora RTP callbacks.
+ */
+extern RTPDynamicProtocolHandler ff_theora_dynamic_handler;
+
+#endif /* AVFORMAT_RTPDEC_THEORA_H */