Index: patched-ffmpeg-mt/libavformat/rtpdec_amr.c |
=================================================================== |
--- patched-ffmpeg-mt/libavformat/rtpdec_amr.c (revision 0) |
+++ patched-ffmpeg-mt/libavformat/rtpdec_amr.c (revision 0) |
@@ -0,0 +1,177 @@ |
+/* |
+ * RTP AMR Depacketizer, RFC 3267 |
+ * Copyright (c) 2010 Martin Storsjo |
+ * |
+ * 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 |
+ */ |
+ |
+#include "avformat.h" |
+#include "rtpdec_amr.h" |
+#include "libavutil/avstring.h" |
+ |
+static const uint8_t frame_sizes_nb[16] = { |
+ 12, 13, 15, 17, 19, 20, 26, 31, 5, 0, 0, 0, 0, 0, 0, 0 |
+}; |
+static const uint8_t frame_sizes_wb[16] = { |
+ 17, 23, 32, 36, 40, 46, 50, 58, 60, 5, 5, 0, 0, 0, 0, 0 |
+}; |
+ |
+static int amr_handle_packet(AVFormatContext *ctx, |
+ PayloadContext *data, |
+ AVStream *st, |
+ AVPacket * pkt, |
+ uint32_t * timestamp, |
+ const uint8_t * buf, |
+ int len, int flags) |
+{ |
+ const uint8_t *frame_sizes = NULL; |
+ int frames; |
+ int i; |
+ const uint8_t *speech_data; |
+ uint8_t *ptr; |
+ |
+ if (st->codec->codec_id == CODEC_ID_AMR_NB) { |
+ frame_sizes = frame_sizes_nb; |
+ } else if (st->codec->codec_id == CODEC_ID_AMR_WB) { |
+ frame_sizes = frame_sizes_wb; |
+ } else { |
+ av_log(ctx, AV_LOG_ERROR, "Bad codec ID\n"); |
+ return AVERROR_INVALIDDATA; |
+ } |
+ |
+ if (st->codec->channels != 1) { |
+ av_log(ctx, AV_LOG_ERROR, "Only mono AMR is supported\n"); |
+ return AVERROR_INVALIDDATA; |
+ } |
+ |
+ /* The AMR RTP packet consists of one header byte, followed |
+ * by one TOC byte for each AMR frame in the packet, followed |
+ * by the speech data for all the AMR frames. |
+ * |
+ * The header byte contains only a codec mode request, for |
+ * requesting what kind of AMR data the sender wants to |
+ * receive. Not used at the moment. |
+ */ |
+ |
+ /* Count the number of frames in the packet. The highest bit |
+ * is set in a TOC byte if there are more frames following. |
+ */ |
+ for (frames = 1; frames < len && (buf[frames] & 0x80); frames++) ; |
+ |
+ if (1 + frames >= len) { |
+ /* We hit the end of the packet while counting frames. */ |
+ av_log(ctx, AV_LOG_ERROR, "No speech data found\n"); |
+ return AVERROR_INVALIDDATA; |
+ } |
+ |
+ speech_data = buf + 1 + frames; |
+ |
+ /* Everything except the codec mode request byte should be output. */ |
+ if (av_new_packet(pkt, len - 1)) { |
+ av_log(ctx, AV_LOG_ERROR, "Out of memory\n"); |
+ return AVERROR_NOMEM; |
+ } |
+ pkt->stream_index = st->index; |
+ ptr = pkt->data; |
+ |
+ for (i = 0; i < frames; i++) { |
+ uint8_t toc = buf[1 + i]; |
+ int frame_size = frame_sizes[(toc >> 3) & 0x0f]; |
+ |
+ if (speech_data + frame_size > buf + len) { |
+ /* Too little speech data */ |
+ av_log(ctx, AV_LOG_WARNING, "Too little speech data in the RTP packet\n"); |
+ /* Set the unwritten part of the packet to zero. */ |
+ memset(ptr, 0, pkt->data + pkt->size - ptr); |
+ pkt->size = ptr - pkt->data; |
+ return 0; |
+ } |
+ |
+ /* Extract the AMR frame mode from the TOC byte */ |
+ *ptr++ = toc & 0x7C; |
+ |
+ /* Copy the speech data */ |
+ memcpy(ptr, speech_data, frame_size); |
+ speech_data += frame_size; |
+ ptr += frame_size; |
+ } |
+ |
+ if (speech_data < buf + len) { |
+ av_log(ctx, AV_LOG_WARNING, "Too much speech data in the RTP packet?\n"); |
+ /* Set the unwritten part of the packet to zero. */ |
+ memset(ptr, 0, pkt->data + pkt->size - ptr); |
+ pkt->size = ptr - pkt->data; |
+ } |
+ |
+ return 0; |
+} |
+ |
+static int amr_parse_sdp_line(AVFormatContext *s, int st_index, |
+ PayloadContext *data, const char *line) |
+{ |
+ const char *p; |
+ char attr[25], value[25]; |
+ |
+ /* Parse an fmtp line this one: |
+ * a=fmtp:97 octet-align=1; interleaving=0 |
+ * That is, a normal fmtp: line followed by semicolon & space |
+ * separated key/value pairs. |
+ */ |
+ if (av_strstart(line, "fmtp:", &p)) { |
+ int octet_align = 0; |
+ int crc = 0; |
+ int interleaving = 0; |
+ int channels = 1; |
+ |
+ 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, sizeof(attr), value, sizeof(value))) { |
+ if (!strcmp(attr, "octet-align")) |
+ octet_align = atoi(value); |
+ else if (!strcmp(attr, "crc")) |
+ crc = atoi(value); |
+ else if (!strcmp(attr, "interleaving")) |
+ interleaving = atoi(value); |
+ else if (!strcmp(attr, "channels")) |
+ channels = atoi(value); |
+ } |
+ if (!octet_align || crc || interleaving || channels != 1) { |
+ av_log(s, AV_LOG_ERROR, "Unsupported RTP/AMR configuration!\n"); |
+ return -1; |
+ } |
+ } |
+ return 0; |
+} |
+ |
+RTPDynamicProtocolHandler ff_amr_nb_dynamic_handler = { |
+ .enc_name = "AMR", |
+ .codec_type = CODEC_TYPE_AUDIO, |
+ .codec_id = CODEC_ID_AMR_NB, |
+ .parse_sdp_a_line = amr_parse_sdp_line, |
+ .parse_packet = amr_handle_packet, |
+}; |
+ |
+RTPDynamicProtocolHandler ff_amr_wb_dynamic_handler = { |
+ .enc_name = "AMR-WB", |
+ .codec_type = CODEC_TYPE_AUDIO, |
+ .codec_id = CODEC_ID_AMR_WB, |
+ .parse_sdp_a_line = amr_parse_sdp_line, |
+ .parse_packet = amr_handle_packet, |
+}; |
+ |