diff options
author | Josh Allmann <joshua.allmann@gmail.com> | 2010-04-01 21:40:56 +0000 |
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committer | Ronald S. Bultje <rsbultje@gmail.com> | 2010-04-01 21:40:56 +0000 |
commit | 06a36faf4c111d621a742eb1116dabc20f5593a8 (patch) | |
tree | e54c53d6a3fd54416e3394a8891e615243de055c /libavformat/rtpdec_theora.c | |
parent | d834d63b0e99b9b088fba06fb2cdf7370d653d78 (diff) |
Rename rtpdec_theora.[ch] to rtpdec_xiph.[ch], as a preparation for merging
the Vorbis / theora depacketizers.
Patch by Josh Allmann <joshua DOT allmann AT gmail DOT com>.
Originally committed as revision 22765 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavformat/rtpdec_theora.c')
-rw-r--r-- | libavformat/rtpdec_theora.c | 387 |
1 files changed, 0 insertions, 387 deletions
diff --git a/libavformat/rtpdec_theora.c b/libavformat/rtpdec_theora.c deleted file mode 100644 index 56a59e4e16..0000000000 --- a/libavformat/rtpdec_theora.c +++ /dev/null @@ -1,387 +0,0 @@ -/* - * 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 = AVMEDIA_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 -}; |