-/**
+/*
* Common code for the RTP depacketization of MPEG-4 formats.
* Copyright (c) 2010 Fabrice Bellard
* Romain Degez
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
* @author Romain Degez
*/
-#include "rtpdec_mpeg4.h"
+#include "rtpdec_formats.h"
#include "internal.h"
+#include "libavutil/attributes.h"
#include "libavutil/avstring.h"
+#include "libavcodec/get_bits.h"
+
+#define MAX_AAC_HBR_FRAME_SIZE 8191
+
+/** Structure listing useful vars to parse RTP packet payload */
+struct PayloadContext {
+ int sizelength;
+ int indexlength;
+ int indexdeltalength;
+ int profile_level_id;
+ int streamtype;
+ int objecttype;
+ char *mode;
+
+ /** mpeg 4 AU headers */
+ struct AUHeaders {
+ int size;
+ int index;
+ int cts_flag;
+ int cts;
+ int dts_flag;
+ int dts;
+ int rap_flag;
+ int streamstate;
+ } *au_headers;
+ int au_headers_allocated;
+ int nb_au_headers;
+ int au_headers_length_bytes;
+ int cur_au_index;
+
+ uint8_t buf[FFMAX(RTP_MAX_PACKET_LENGTH, MAX_AAC_HBR_FRAME_SIZE)];
+ int buf_pos, buf_size;
+ uint32_t timestamp;
+};
+
+typedef struct AttrNameMap {
+ const char *str;
+ uint16_t type;
+ uint32_t offset;
+} AttrNameMap;
-/* return the length and optionally the data */
-static int hex_to_data(uint8_t *data, const char *p)
+/* All known fmtp parameters and the corresponding RTPAttrTypeEnum */
+#define ATTR_NAME_TYPE_INT 0
+#define ATTR_NAME_TYPE_STR 1
+static const AttrNameMap attr_names[] = {
+ { "SizeLength", ATTR_NAME_TYPE_INT,
+ offsetof(PayloadContext, sizelength) },
+ { "IndexLength", ATTR_NAME_TYPE_INT,
+ offsetof(PayloadContext, indexlength) },
+ { "IndexDeltaLength", ATTR_NAME_TYPE_INT,
+ offsetof(PayloadContext, indexdeltalength) },
+ { "profile-level-id", ATTR_NAME_TYPE_INT,
+ offsetof(PayloadContext, profile_level_id) },
+ { "StreamType", ATTR_NAME_TYPE_INT,
+ offsetof(PayloadContext, streamtype) },
+ { "mode", ATTR_NAME_TYPE_STR,
+ offsetof(PayloadContext, mode) },
+ { NULL, -1, -1 },
+};
+
+static void close_context(PayloadContext *data)
{
- int c, len, v;
-
- len = 0;
- v = 1;
- for (;;) {
- p += strspn(p, SPACE_CHARS);
- if (*p == '\0')
- break;
- c = toupper((unsigned char) *p++);
- if (c >= '0' && c <= '9')
- c = c - '0';
- else if (c >= 'A' && c <= 'F')
- c = c - 'A' + 10;
- else
- break;
- v = (v << 4) | c;
- if (v & 0x100) {
- if (data)
- data[len] = v;
- len++;
- v = 1;
- }
- }
- return len;
+ av_free(data->au_headers);
+ av_free(data->mode);
}
-static int parse_fmtp_config(AVCodecContext * codec, char *value)
+static int parse_fmtp_config(AVCodecContext *codec, const char *value)
{
/* decode the hexa encoded parameter */
- int len = hex_to_data(NULL, value);
- if (codec->extradata)
- av_free(codec->extradata);
- codec->extradata = av_mallocz(len + FF_INPUT_BUFFER_PADDING_SIZE);
+ int len = ff_hex_to_data(NULL, value);
+ av_free(codec->extradata);
+ codec->extradata = av_mallocz(len + AV_INPUT_BUFFER_PADDING_SIZE);
if (!codec->extradata)
return AVERROR(ENOMEM);
codec->extradata_size = len;
- hex_to_data(codec->extradata, value);
+ ff_hex_to_data(codec->extradata, value);
return 0;
}
-static int parse_sdp_line(AVFormatContext *s, int st_index,
- PayloadContext *data, const char *line)
+static int rtp_parse_mp4_au(PayloadContext *data, const uint8_t *buf, int len)
{
- const char *p;
- char value[4096], attr[25];
- int res = 0;
- AVCodecContext* codec = s->streams[st_index]->codec;
-
- 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, sizeof(attr),
- value, sizeof(value))) {
- if (!strcmp(attr, "config")) {
- res = parse_fmtp_config(codec, value);
-
- if (res < 0)
- return res;
+ int au_headers_length, au_header_size, i;
+ GetBitContext getbitcontext;
+
+ if (len < 2)
+ return AVERROR_INVALIDDATA;
+
+ /* decode the first 2 bytes where the AUHeader sections are stored
+ length in bits */
+ au_headers_length = AV_RB16(buf);
+
+ if (au_headers_length > RTP_MAX_PACKET_LENGTH)
+ return -1;
+
+ data->au_headers_length_bytes = (au_headers_length + 7) / 8;
+
+ /* skip AU headers length section (2 bytes) */
+ buf += 2;
+ len -= 2;
+
+ if (len < data->au_headers_length_bytes)
+ return AVERROR_INVALIDDATA;
+
+ init_get_bits(&getbitcontext, buf, data->au_headers_length_bytes * 8);
+
+ /* XXX: Wrong if optionnal additional sections are present (cts, dts etc...) */
+ au_header_size = data->sizelength + data->indexlength;
+ if (au_header_size <= 0 || (au_headers_length % au_header_size != 0))
+ return -1;
+
+ data->nb_au_headers = au_headers_length / au_header_size;
+ if (!data->au_headers || data->au_headers_allocated < data->nb_au_headers) {
+ av_free(data->au_headers);
+ data->au_headers = av_malloc(sizeof(struct AUHeaders) * data->nb_au_headers);
+ if (!data->au_headers)
+ return AVERROR(ENOMEM);
+ data->au_headers_allocated = data->nb_au_headers;
+ }
+
+ for (i = 0; i < data->nb_au_headers; ++i) {
+ data->au_headers[i].size = get_bits_long(&getbitcontext, data->sizelength);
+ data->au_headers[i].index = get_bits_long(&getbitcontext, data->indexlength);
+ }
+
+ return 0;
+}
+
+
+/* Follows RFC 3640 */
+static int aac_parse_packet(AVFormatContext *ctx, PayloadContext *data,
+ AVStream *st, AVPacket *pkt, uint32_t *timestamp,
+ const uint8_t *buf, int len, uint16_t seq,
+ int flags)
+{
+ int ret;
+
+ if (!buf) {
+ if (data->cur_au_index > data->nb_au_headers) {
+ av_log(ctx, AV_LOG_ERROR, "Invalid parser state\n");
+ return AVERROR_INVALIDDATA;
+ }
+ if (data->buf_size - data->buf_pos < data->au_headers[data->cur_au_index].size) {
+ av_log(ctx, AV_LOG_ERROR, "Invalid AU size\n");
+ return AVERROR_INVALIDDATA;
+ }
+ if ((ret = av_new_packet(pkt, data->au_headers[data->cur_au_index].size)) < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Out of memory\n");
+ return ret;
+ }
+ memcpy(pkt->data, &data->buf[data->buf_pos], data->au_headers[data->cur_au_index].size);
+ data->buf_pos += data->au_headers[data->cur_au_index].size;
+ pkt->stream_index = st->index;
+ data->cur_au_index++;
+
+ if (data->cur_au_index == data->nb_au_headers) {
+ data->buf_pos = 0;
+ return 0;
+ }
+
+ return 1;
+ }
+
+ if (rtp_parse_mp4_au(data, buf, len)) {
+ av_log(ctx, AV_LOG_ERROR, "Error parsing AU headers\n");
+ return -1;
+ }
+
+ buf += data->au_headers_length_bytes + 2;
+ len -= data->au_headers_length_bytes + 2;
+ if (data->nb_au_headers == 1 && len < data->au_headers[0].size) {
+ /* Packet is fragmented */
+
+ if (!data->buf_pos) {
+ if (data->au_headers[0].size > MAX_AAC_HBR_FRAME_SIZE) {
+ av_log(ctx, AV_LOG_ERROR, "Invalid AU size\n");
+ return AVERROR_INVALIDDATA;
}
+
+ data->buf_size = data->au_headers[0].size;
+ data->timestamp = *timestamp;
+ }
+
+ if (data->timestamp != *timestamp ||
+ data->au_headers[0].size != data->buf_size ||
+ data->buf_pos + len > MAX_AAC_HBR_FRAME_SIZE) {
+ data->buf_pos = 0;
+ data->buf_size = 0;
+ av_log(ctx, AV_LOG_ERROR, "Invalid packet received\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ memcpy(&data->buf[data->buf_pos], buf, len);
+ data->buf_pos += len;
+
+ if (!(flags & RTP_FLAG_MARKER))
+ return AVERROR(EAGAIN);
+
+ if (data->buf_pos != data->buf_size) {
+ data->buf_pos = 0;
+ av_log(ctx, AV_LOG_ERROR, "Missed some packets, discarding frame\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ data->buf_pos = 0;
+ ret = av_new_packet(pkt, data->buf_size);
+ if (ret < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Out of memory\n");
+ return ret;
}
+ pkt->stream_index = st->index;
+
+ memcpy(pkt->data, data->buf, data->buf_size);
+
+ return 0;
+ }
+
+ if (len < data->au_headers[0].size) {
+ av_log(ctx, AV_LOG_ERROR, "First AU larger than packet size\n");
+ return AVERROR_INVALIDDATA;
+ }
+ if ((ret = av_new_packet(pkt, data->au_headers[0].size)) < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Out of memory\n");
+ return ret;
+ }
+ memcpy(pkt->data, buf, data->au_headers[0].size);
+ len -= data->au_headers[0].size;
+ buf += data->au_headers[0].size;
+ pkt->stream_index = st->index;
+
+ if (len > 0 && data->nb_au_headers > 1) {
+ data->buf_size = FFMIN(len, sizeof(data->buf));
+ memcpy(data->buf, buf, data->buf_size);
+ data->cur_au_index = 1;
+ data->buf_pos = 0;
+ return 1;
}
return 0;
+}
+
+static int parse_fmtp(AVFormatContext *s,
+ AVStream *stream, PayloadContext *data,
+ const char *attr, const char *value)
+{
+ AVCodecContext *codec = stream->codec;
+ int res, i;
+
+ if (!strcmp(attr, "config")) {
+ res = parse_fmtp_config(codec, value);
+
+ if (res < 0)
+ return res;
+ }
+
+ if (codec->codec_id == AV_CODEC_ID_AAC) {
+ /* Looking for a known attribute */
+ for (i = 0; attr_names[i].str; ++i) {
+ if (!av_strcasecmp(attr, attr_names[i].str)) {
+ if (attr_names[i].type == ATTR_NAME_TYPE_INT) {
+ *(int *)((char *)data+
+ attr_names[i].offset) = atoi(value);
+ } else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
+ *(char **)((char *)data+
+ attr_names[i].offset) = av_strdup(value);
+ }
+ }
+ }
+ return 0;
+}
+
+static int parse_sdp_line(AVFormatContext *s, int st_index,
+ PayloadContext *data, const char *line)
+{
+ const char *p;
+
+ if (st_index < 0)
+ return 0;
+ if (av_strstart(line, "fmtp:", &p))
+ return ff_parse_fmtp(s, s->streams[st_index], data, p, parse_fmtp);
+
+ return 0;
}
RTPDynamicProtocolHandler ff_mp4v_es_dynamic_handler = {
.enc_name = "MP4V-ES",
.codec_type = AVMEDIA_TYPE_VIDEO,
- .codec_id = CODEC_ID_MPEG4,
+ .codec_id = AV_CODEC_ID_MPEG4,
+ .need_parsing = AVSTREAM_PARSE_FULL,
+ .priv_data_size = sizeof(PayloadContext),
.parse_sdp_a_line = parse_sdp_line,
- .open = NULL,
- .close = NULL,
- .parse_packet = NULL
};
RTPDynamicProtocolHandler ff_mpeg4_generic_dynamic_handler = {
.enc_name = "mpeg4-generic",
.codec_type = AVMEDIA_TYPE_AUDIO,
- .codec_id = CODEC_ID_AAC,
+ .codec_id = AV_CODEC_ID_AAC,
+ .priv_data_size = sizeof(PayloadContext),
.parse_sdp_a_line = parse_sdp_line,
- .open = NULL,
- .close = NULL,
- .parse_packet = NULL
+ .close = close_context,
+ .parse_packet = aac_parse_packet,
};
projects / ffmpeg / blobdiff