[deb_ffmpeg.git] / ffmpeg / libavformat / rtpdec_mpeg4.c

/*
 * Common code for the RTP depacketization of MPEG-4 formats.
 * Copyright (c) 2010 Fabrice Bellard
 *                    Romain Degez
 *
 * 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
 * @brief MPEG4 / RTP Code
 * @author Fabrice Bellard
 * @author Romain Degez
 */

#include "rtpdec_formats.h"
#include "internal.h"
#include "libavutil/attributes.h"
#include "libavutil/avstring.h"
#include "libavcodec/get_bits.h"

/** 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[RTP_MAX_PACKET_LENGTH];
    int buf_pos, buf_size;
};

typedef struct {
    const char *str;
    uint16_t    type;
    uint32_t    offset;
} AttrNameMap;

/* 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 PayloadContext *new_context(void)
{
    return av_mallocz(sizeof(PayloadContext));
}

static void free_context(PayloadContext *data)
{
    av_free(data->au_headers);
    av_free(data->mode);
    av_free(data);
}

static int parse_fmtp_config(AVCodecContext *codec, char *value)
{
    /* decode the hexa encoded parameter */
    int len = ff_hex_to_data(NULL, value);
    av_free(codec->extradata);
    if (ff_alloc_extradata(codec, len))
        return AVERROR(ENOMEM);
    ff_hex_to_data(codec->extradata, value);
    return 0;
}

static int rtp_parse_mp4_au(PayloadContext *data, const uint8_t *buf, int len)
{
    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 optional 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)
            return AVERROR_INVALIDDATA;
        if (data->buf_size - data->buf_pos < data->au_headers[data->cur_au_index].size)
            return AVERROR_INVALIDDATA;
        if ((ret = av_new_packet(pkt, data->au_headers[data->cur_au_index].size)) < 0)
            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++;
        return data->cur_au_index < data->nb_au_headers;
    }

    if (rtp_parse_mp4_au(data, buf, len))
        return -1;

    buf += data->au_headers_length_bytes + 2;
    len -= data->au_headers_length_bytes + 2;

    if (len < data->au_headers[0].size)
        return AVERROR_INVALIDDATA;
    if ((ret = av_new_packet(pkt, data->au_headers[0].size)) < 0)
        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,
                      char *attr, 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;
}

static av_cold int init_video(AVFormatContext *s, int st_index,
                              PayloadContext *data)
{
    if (st_index < 0)
        return 0;
    s->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL;
    return 0;
}

RTPDynamicProtocolHandler ff_mp4v_es_dynamic_handler = {
    .enc_name           = "MP4V-ES",
    .codec_type         = AVMEDIA_TYPE_VIDEO,
    .codec_id           = AV_CODEC_ID_MPEG4,
    .init               = init_video,
    .parse_sdp_a_line   = parse_sdp_line,
};

RTPDynamicProtocolHandler ff_mpeg4_generic_dynamic_handler = {
    .enc_name           = "mpeg4-generic",
    .codec_type         = AVMEDIA_TYPE_AUDIO,
    .codec_id           = AV_CODEC_ID_AAC,
    .parse_sdp_a_line   = parse_sdp_line,
    .alloc              = new_context,
    .free               = free_context,
    .parse_packet       = aac_parse_packet
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Common code for the RTP depacketization of MPEG-4 formats.
	3	* Copyright (c) 2010 Fabrice Bellard
	4	* Romain Degez
	5	*
	6	* This file is part of FFmpeg.
	7	*
	8	* FFmpeg is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; either
	11	* version 2.1 of the License, or (at your option) any later version.
	12	*
	13	* FFmpeg is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with FFmpeg; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	/**
	24	* @file
	25	* @brief MPEG4 / RTP Code
	26	* @author Fabrice Bellard
	27	* @author Romain Degez
	28	*/
	29
	30	#include "rtpdec_formats.h"
	31	#include "internal.h"
	32	#include "libavutil/attributes.h"
	33	#include "libavutil/avstring.h"
	34	#include "libavcodec/get_bits.h"
	35
	36	/** Structure listing useful vars to parse RTP packet payload */
	37	struct PayloadContext {
	38	int sizelength;
	39	int indexlength;
	40	int indexdeltalength;
	41	int profile_level_id;
	42	int streamtype;
	43	int objecttype;
	44	char *mode;
	45
	46	/** mpeg 4 AU headers */
	47	struct AUHeaders {
	48	int size;
	49	int index;
	50	int cts_flag;
	51	int cts;
	52	int dts_flag;
	53	int dts;
	54	int rap_flag;
	55	int streamstate;
	56	} *au_headers;
	57	int au_headers_allocated;
	58	int nb_au_headers;
	59	int au_headers_length_bytes;
	60	int cur_au_index;
	61
	62	uint8_t buf[RTP_MAX_PACKET_LENGTH];
	63	int buf_pos, buf_size;
	64	};
65
66	typedef struct {
67	const char *str;
68	uint16_t type;
69	uint32_t offset;
70	} AttrNameMap;
71
72	/* All known fmtp parameters and the corresponding RTPAttrTypeEnum */
73	#define ATTR_NAME_TYPE_INT 0
74	#define ATTR_NAME_TYPE_STR 1
75	static const AttrNameMap attr_names[] = {
76	{ "SizeLength", ATTR_NAME_TYPE_INT,
77	offsetof(PayloadContext, sizelength) },
78	{ "IndexLength", ATTR_NAME_TYPE_INT,
79	offsetof(PayloadContext, indexlength) },
80	{ "IndexDeltaLength", ATTR_NAME_TYPE_INT,
81	offsetof(PayloadContext, indexdeltalength) },
82	{ "profile-level-id", ATTR_NAME_TYPE_INT,
83	offsetof(PayloadContext, profile_level_id) },
84	{ "StreamType", ATTR_NAME_TYPE_INT,
85	offsetof(PayloadContext, streamtype) },
86	{ "mode", ATTR_NAME_TYPE_STR,
87	offsetof(PayloadContext, mode) },
88	{ NULL, -1, -1 },
89	};
90
91	static PayloadContext *new_context(void)
92	{
93	return av_mallocz(sizeof(PayloadContext));
94	}
95
96	static void free_context(PayloadContext *data)
97	{
98	av_free(data->au_headers);
99	av_free(data->mode);
100	av_free(data);
101	}
102
103	static int parse_fmtp_config(AVCodecContext codec, char value)
104	{
105	/* decode the hexa encoded parameter */
106	int len = ff_hex_to_data(NULL, value);
107	av_free(codec->extradata);
108	if (ff_alloc_extradata(codec, len))
109	return AVERROR(ENOMEM);
110	ff_hex_to_data(codec->extradata, value);
111	return 0;
112	}
113
114	static int rtp_parse_mp4_au(PayloadContext data, const uint8_t buf, int len)
115	{
116	int au_headers_length, au_header_size, i;
117	GetBitContext getbitcontext;
118
119	if (len < 2)
120	return AVERROR_INVALIDDATA;
121
122	/* decode the first 2 bytes where the AUHeader sections are stored
123	length in bits */
124	au_headers_length = AV_RB16(buf);
125
126	if (au_headers_length > RTP_MAX_PACKET_LENGTH)
127	return -1;
128
129	data->au_headers_length_bytes = (au_headers_length + 7) / 8;
130
131	/* skip AU headers length section (2 bytes) */
132	buf += 2;
133	len -= 2;
134
135	if (len < data->au_headers_length_bytes)
136	return AVERROR_INVALIDDATA;
137
138	init_get_bits(&getbitcontext, buf, data->au_headers_length_bytes * 8);
139
140	/* XXX: Wrong if optional additional sections are present (cts, dts etc...) */
141	au_header_size = data->sizelength + data->indexlength;
142	if (au_header_size <= 0 \|\| (au_headers_length % au_header_size != 0))
143	return -1;
144
145	data->nb_au_headers = au_headers_length / au_header_size;
146	if (!data->au_headers \|\| data->au_headers_allocated < data->nb_au_headers) {
147	av_free(data->au_headers);
148	data->au_headers = av_malloc(sizeof(struct AUHeaders) * data->nb_au_headers);
149	if (!data->au_headers)
150	return AVERROR(ENOMEM);
151	data->au_headers_allocated = data->nb_au_headers;
152	}
153
154	for (i = 0; i < data->nb_au_headers; ++i) {
155	data->au_headers[i].size = get_bits_long(&getbitcontext, data->sizelength);
156	data->au_headers[i].index = get_bits_long(&getbitcontext, data->indexlength);
157	}
158
159	return 0;
160	}
161
162
163	/* Follows RFC 3640 */
164	static int aac_parse_packet(AVFormatContext ctx, PayloadContext data,
165	AVStream st, AVPacket pkt, uint32_t *timestamp,
166	const uint8_t *buf, int len, uint16_t seq,
167	int flags)
168	{
169	int ret;
170
171	if (!buf) {
172	if (data->cur_au_index > data->nb_au_headers)
173	return AVERROR_INVALIDDATA;
174	if (data->buf_size - data->buf_pos < data->au_headers[data->cur_au_index].size)
175	return AVERROR_INVALIDDATA;
176	if ((ret = av_new_packet(pkt, data->au_headers[data->cur_au_index].size)) < 0)
177	return ret;
178	memcpy(pkt->data, &data->buf[data->buf_pos], data->au_headers[data->cur_au_index].size);
179	data->buf_pos += data->au_headers[data->cur_au_index].size;
180	pkt->stream_index = st->index;
181	data->cur_au_index++;
182	return data->cur_au_index < data->nb_au_headers;
183	}
184
185	if (rtp_parse_mp4_au(data, buf, len))
186	return -1;
187
188	buf += data->au_headers_length_bytes + 2;
189	len -= data->au_headers_length_bytes + 2;
190
191	if (len < data->au_headers[0].size)
192	return AVERROR_INVALIDDATA;
193	if ((ret = av_new_packet(pkt, data->au_headers[0].size)) < 0)
194	return ret;
195	memcpy(pkt->data, buf, data->au_headers[0].size);
196	len -= data->au_headers[0].size;
197	buf += data->au_headers[0].size;
198	pkt->stream_index = st->index;
199
200	if (len > 0 && data->nb_au_headers > 1) {
201	data->buf_size = FFMIN(len, sizeof(data->buf));
202	memcpy(data->buf, buf, data->buf_size);
203	data->cur_au_index = 1;
204	data->buf_pos = 0;
205	return 1;
206	}
207
208	return 0;
209	}
210
211	static int parse_fmtp(AVFormatContext *s,
212	AVStream stream, PayloadContext data,
213	char attr, char value)
214	{
215	AVCodecContext *codec = stream->codec;
216	int res, i;
217
218	if (!strcmp(attr, "config")) {
219	res = parse_fmtp_config(codec, value);
220
221	if (res < 0)
222	return res;
223	}
224
225	if (codec->codec_id == AV_CODEC_ID_AAC) {
226	/* Looking for a known attribute */
227	for (i = 0; attr_names[i].str; ++i) {
228	if (!av_strcasecmp(attr, attr_names[i].str)) {
229	if (attr_names[i].type == ATTR_NAME_TYPE_INT) {
230	(int )((char *)data+
231	attr_names[i].offset) = atoi(value);
232	} else if (attr_names[i].type == ATTR_NAME_TYPE_STR)
233	(char )((char )data+
234	attr_names[i].offset) = av_strdup(value);
235	}
236	}
237	}
238	return 0;
239	}
240
241	static int parse_sdp_line(AVFormatContext *s, int st_index,
242	PayloadContext data, const char line)
243	{
244	const char *p;
245
246	if (st_index < 0)
247	return 0;
248
249	if (av_strstart(line, "fmtp:", &p))
250	return ff_parse_fmtp(s, s->streams[st_index], data, p, parse_fmtp);
251
252	return 0;
253	}
254
255	static av_cold int init_video(AVFormatContext *s, int st_index,
256	PayloadContext *data)
257	{
258	if (st_index < 0)
259	return 0;
260	s->streams[st_index]->need_parsing = AVSTREAM_PARSE_FULL;
261	return 0;
262	}
263
264	RTPDynamicProtocolHandler ff_mp4v_es_dynamic_handler = {
265	.enc_name = "MP4V-ES",
266	.codec_type = AVMEDIA_TYPE_VIDEO,
267	.codec_id = AV_CODEC_ID_MPEG4,
268	.init = init_video,
269	.parse_sdp_a_line = parse_sdp_line,
270	};
271
272	RTPDynamicProtocolHandler ff_mpeg4_generic_dynamic_handler = {
273	.enc_name = "mpeg4-generic",
274	.codec_type = AVMEDIA_TYPE_AUDIO,
275	.codec_id = AV_CODEC_ID_AAC,
276	.parse_sdp_a_line = parse_sdp_line,
277	.alloc = new_context,
278	.free = free_context,
279	.parse_packet = aac_parse_packet
280	};