[deb_ffmpeg.git] / ffmpeg / libavcodec / vorbis_parser.c

/*
 * Copyright (c) 2012 Justin Ruggles
 *
 * 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
 * Vorbis audio parser
 *
 * Determines the duration for each packet.
 */

#include "libavutil/log.h"

#include "get_bits.h"
#include "parser.h"
#include "xiph.h"
#include "vorbis_parser_internal.h"

static const AVClass vorbis_parser_class = {
    .class_name = "Vorbis parser",
    .item_name  = av_default_item_name,
    .version    = LIBAVUTIL_VERSION_INT,
};

static int parse_id_header(AVVorbisParseContext *s,
                           const uint8_t *buf, int buf_size)
{
    /* Id header should be 30 bytes */
    if (buf_size < 30) {
        av_log(s, AV_LOG_ERROR, "Id header is too short\n");
        return AVERROR_INVALIDDATA;
    }

    /* make sure this is the Id header */
    if (buf[0] != 1) {
        av_log(s, AV_LOG_ERROR, "Wrong packet type in Id header\n");
        return AVERROR_INVALIDDATA;
    }

    /* check for header signature */
    if (memcmp(&buf[1], "vorbis", 6)) {
        av_log(s, AV_LOG_ERROR, "Invalid packet signature in Id header\n");
        return AVERROR_INVALIDDATA;
    }

    if (!(buf[29] & 0x1)) {
        av_log(s, AV_LOG_ERROR, "Invalid framing bit in Id header\n");
        return AVERROR_INVALIDDATA;
    }

    s->blocksize[0] = 1 << (buf[28] & 0xF);
    s->blocksize[1] = 1 << (buf[28] >>  4);

    return 0;
}

static int parse_setup_header(AVVorbisParseContext *s,
                              const uint8_t *buf, int buf_size)
{
    GetBitContext gb, gb0;
    uint8_t *rev_buf;
    int i, ret = 0;
    int got_framing_bit, mode_count, got_mode_header, last_mode_count = 0;

    /* avoid overread */
    if (buf_size < 7) {
        av_log(s, AV_LOG_ERROR, "Setup header is too short\n");
        return AVERROR_INVALIDDATA;
    }

    /* make sure this is the Setup header */
    if (buf[0] != 5) {
        av_log(s, AV_LOG_ERROR, "Wrong packet type in Setup header\n");
        return AVERROR_INVALIDDATA;
    }

    /* check for header signature */
    if (memcmp(&buf[1], "vorbis", 6)) {
        av_log(s, AV_LOG_ERROR, "Invalid packet signature in Setup header\n");
        return AVERROR_INVALIDDATA;
    }

    /* reverse bytes so we can easily read backwards with get_bits() */
    if (!(rev_buf = av_malloc(buf_size))) {
        av_log(s, AV_LOG_ERROR, "Out of memory\n");
        return AVERROR(ENOMEM);
    }
    for (i = 0; i < buf_size; i++)
        rev_buf[i] = buf[buf_size - 1 - i];
    init_get_bits(&gb, rev_buf, buf_size * 8);

    got_framing_bit = 0;
    while (get_bits_left(&gb) > 97) {
        if (get_bits1(&gb)) {
            got_framing_bit = get_bits_count(&gb);
            break;
        }
    }
    if (!got_framing_bit) {
        av_log(s, AV_LOG_ERROR, "Invalid Setup header\n");
        ret = AVERROR_INVALIDDATA;
        goto bad_header;
    }

    /* Now we search backwards to find possible valid mode counts. This is not
     * fool-proof because we could have false positive matches and read too
     * far, but there isn't really any way to be sure without parsing through
     * all the many variable-sized fields before the modes. This approach seems
     * to work well in testing, and it is similar to how it is handled in
     * liboggz. */
    mode_count = 0;
    got_mode_header = 0;
    while (get_bits_left(&gb) >= 97) {
        if (get_bits(&gb, 8) > 63 || get_bits(&gb, 16) || get_bits(&gb, 16))
            break;
        skip_bits(&gb, 1);
        mode_count++;
        if (mode_count > 64)
            break;
        gb0 = gb;
        if (get_bits(&gb0, 6) + 1 == mode_count) {
            got_mode_header = 1;
            last_mode_count = mode_count;
        }
    }
    if (!got_mode_header) {
        av_log(s, AV_LOG_ERROR, "Invalid Setup header\n");
        ret = AVERROR_INVALIDDATA;
        goto bad_header;
    }
    /* All samples I've seen use <= 2 modes, so ask for a sample if we find
     * more than that, as it is most likely a false positive. If we get any
     * we may need to approach this the long way and parse the whole Setup
     * header, but I hope very much that it never comes to that. */
    if (last_mode_count > 2) {
        avpriv_request_sample(s,
                              "%d modes (either a false positive or a "
                              "sample from an unknown encoder)",
                              last_mode_count);
    }
    /* We're limiting the mode count to 63 so that we know that the previous
     * block flag will be in the first packet byte. */
    if (last_mode_count > 63) {
        av_log(s, AV_LOG_ERROR, "Unsupported mode count: %d\n",
               last_mode_count);
        ret = AVERROR_INVALIDDATA;
        goto bad_header;
    }
    s->mode_count = mode_count = last_mode_count;
    /* Determine the number of bits required to code the mode and turn that
     * into a bitmask to directly access the mode from the first frame byte. */
    s->mode_mask = ((1 << (av_log2(mode_count - 1) + 1)) - 1) << 1;
    /* The previous window flag is the next bit after the mode */
    s->prev_mask = (s->mode_mask | 0x1) + 1;

    init_get_bits(&gb, rev_buf, buf_size * 8);
    skip_bits_long(&gb, got_framing_bit);
    for (i = mode_count - 1; i >= 0; i--) {
        skip_bits_long(&gb, 40);
        s->mode_blocksize[i] = get_bits1(&gb);
    }

bad_header:
    av_free(rev_buf);
    return ret;
}

static int vorbis_parse_init(AVVorbisParseContext *s,
                             const uint8_t *extradata, int extradata_size)
{
    uint8_t *header_start[3];
    int header_len[3];
    int ret;

    s->class = &vorbis_parser_class;
    s->extradata_parsed = 1;

    if ((ret = avpriv_split_xiph_headers(extradata,
                                         extradata_size, 30,
                                         header_start, header_len)) < 0) {
        av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
        return ret;
    }

    if ((ret = parse_id_header(s, header_start[0], header_len[0])) < 0)
        return ret;

    if ((ret = parse_setup_header(s, header_start[2], header_len[2])) < 0)
        return ret;

    s->valid_extradata = 1;
    s->previous_blocksize = s->blocksize[s->mode_blocksize[0]];

    return 0;
}

int av_vorbis_parse_frame_flags(AVVorbisParseContext *s, const uint8_t *buf,
                                int buf_size, int *flags)
{
    int duration = 0;

    if (s->valid_extradata && buf_size > 0) {
        int mode, current_blocksize;
        int previous_blocksize = s->previous_blocksize;

        if (buf[0] & 1) {
            /* If the user doesn't care about special packets, it's a bad one. */
            if (!flags)
                goto bad_packet;

            /* Set the flag for which kind of special packet it is. */
            if (buf[0] == 1)
                *flags |= VORBIS_FLAG_HEADER;
            else if (buf[0] == 3)
                *flags |= VORBIS_FLAG_COMMENT;
            else
                goto bad_packet;

            /* Special packets have no duration. */
            return 0;

bad_packet:
            av_log(s, AV_LOG_ERROR, "Invalid packet\n");
            return AVERROR_INVALIDDATA;
        }
        if (s->mode_count == 1)
            mode = 0;
        else
            mode = (buf[0] & s->mode_mask) >> 1;
        if (mode >= s->mode_count) {
            av_log(s, AV_LOG_ERROR, "Invalid mode in packet\n");
            return AVERROR_INVALIDDATA;
        }
        if(s->mode_blocksize[mode]){
            int flag = !!(buf[0] & s->prev_mask);
            previous_blocksize = s->blocksize[flag];
        }
        current_blocksize     = s->blocksize[s->mode_blocksize[mode]];
        duration              = (previous_blocksize + current_blocksize) >> 2;
        s->previous_blocksize = current_blocksize;
    }

    return duration;
}

int av_vorbis_parse_frame(AVVorbisParseContext *s, const uint8_t *buf,
                          int buf_size)
{
    return av_vorbis_parse_frame_flags(s, buf, buf_size, NULL);
}

void av_vorbis_parse_reset(AVVorbisParseContext *s)
{
    if (s->valid_extradata)
        s->previous_blocksize = s->blocksize[0];
}

void av_vorbis_parse_free(AVVorbisParseContext **s)
{
    av_freep(s);
}

AVVorbisParseContext *av_vorbis_parse_init(const uint8_t *extradata,
                                           int extradata_size)
{
    AVVorbisParseContext *s = av_mallocz(sizeof(*s));
    int ret;

    if (!s)
        return NULL;

    ret = vorbis_parse_init(s, extradata, extradata_size);
    if (ret < 0) {
        av_vorbis_parse_free(&s);
        return NULL;
    }

    return s;
}

#if LIBAVCODEC_VERSION_MAJOR < 57
int avpriv_vorbis_parse_extradata(AVCodecContext *avctx, AVVorbisParseContext *s)
{
    return vorbis_parse_init(s, avctx->extradata, avctx->extradata_size);
}
void avpriv_vorbis_parse_reset(AVVorbisParseContext *s)
{
    av_vorbis_parse_reset(s);
}
int avpriv_vorbis_parse_frame(AVVorbisParseContext *s, const uint8_t *buf,
                              int buf_size)
{
    return av_vorbis_parse_frame(s, buf, buf_size);
}
int avpriv_vorbis_parse_frame_flags(AVVorbisParseContext *s, const uint8_t *buf,
                                    int buf_size, int *flags)
{
    return av_vorbis_parse_frame_flags(s, buf, buf_size, flags);
}
#endif

#if CONFIG_VORBIS_PARSER

typedef struct VorbisParseContext {
    AVVorbisParseContext *vp;
} VorbisParseContext;

static int vorbis_parse(AVCodecParserContext *s1, AVCodecContext *avctx,
                        const uint8_t **poutbuf, int *poutbuf_size,
                        const uint8_t *buf, int buf_size)
{
    VorbisParseContext *s = s1->priv_data;
    int duration;

    if (!s->vp && avctx->extradata && avctx->extradata_size) {
        s->vp = av_vorbis_parse_init(avctx->extradata, avctx->extradata_size);
    }
    if (!s->vp)
        goto end;

    if ((duration = av_vorbis_parse_frame(s->vp, buf, buf_size)) >= 0)
        s1->duration = duration;

end:
    /* always return the full packet. this parser isn't doing any splitting or
       combining, only packet analysis */
    *poutbuf      = buf;
    *poutbuf_size = buf_size;
    return buf_size;
}

static void vorbis_parser_close(AVCodecParserContext *ctx)
{
    VorbisParseContext *s = ctx->priv_data;
    av_vorbis_parse_free(&s->vp);
}

AVCodecParser ff_vorbis_parser = {
    .codec_ids      = { AV_CODEC_ID_VORBIS },
    .priv_data_size = sizeof(VorbisParseContext),
    .parser_parse   = vorbis_parse,
    .parser_close   = vorbis_parser_close,
};
#endif /* CONFIG_VORBIS_PARSER */
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Copyright (c) 2012 Justin Ruggles
	3	*
	4	* This file is part of FFmpeg.
	5	*
	6	* FFmpeg is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2.1 of the License, or (at your option) any later version.
	10	*
	11	* FFmpeg is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public
	17	* License along with FFmpeg; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	/**
	22	* @file
	23	* Vorbis audio parser
	24	*
	25	* Determines the duration for each packet.
	26	*/
	27
f6fa7814 DM	28	#include "libavutil/log.h"
f6fa7814 DM	29
2ba45a60 DM	30	#include "get_bits.h"
	31	#include "parser.h"
	32	#include "xiph.h"
f6fa7814 DM	33	#include "vorbis_parser_internal.h"
	34
	35	static const AVClass vorbis_parser_class = {
	36	.class_name = "Vorbis parser",
	37	.item_name = av_default_item_name,
	38	.version = LIBAVUTIL_VERSION_INT,
	39	};
2ba45a60	40
f6fa7814	41	static int parse_id_header(AVVorbisParseContext *s,
2ba45a60 DM	42	const uint8_t *buf, int buf_size)
	43	{
	44	/* Id header should be 30 bytes */
	45	if (buf_size < 30) {
f6fa7814	46	av_log(s, AV_LOG_ERROR, "Id header is too short\n");
2ba45a60 DM	47	return AVERROR_INVALIDDATA;
	48	}
	49
	50	/* make sure this is the Id header */
	51	if (buf[0] != 1) {
f6fa7814	52	av_log(s, AV_LOG_ERROR, "Wrong packet type in Id header\n");
2ba45a60 DM	53	return AVERROR_INVALIDDATA;
	54	}
	55
	56	/* check for header signature */
	57	if (memcmp(&buf[1], "vorbis", 6)) {
f6fa7814	58	av_log(s, AV_LOG_ERROR, "Invalid packet signature in Id header\n");
2ba45a60 DM	59	return AVERROR_INVALIDDATA;
	60	}
	61
	62	if (!(buf[29] & 0x1)) {
f6fa7814	63	av_log(s, AV_LOG_ERROR, "Invalid framing bit in Id header\n");
2ba45a60 DM	64	return AVERROR_INVALIDDATA;
	65	}
	66
	67	s->blocksize[0] = 1 << (buf[28] & 0xF);
	68	s->blocksize[1] = 1 << (buf[28] >> 4);
	69
	70	return 0;
	71	}
	72
f6fa7814	73	static int parse_setup_header(AVVorbisParseContext *s,
2ba45a60 DM	74	const uint8_t *buf, int buf_size)
	75	{
	76	GetBitContext gb, gb0;
	77	uint8_t *rev_buf;
	78	int i, ret = 0;
	79	int got_framing_bit, mode_count, got_mode_header, last_mode_count = 0;
	80
	81	/* avoid overread */
	82	if (buf_size < 7) {
f6fa7814	83	av_log(s, AV_LOG_ERROR, "Setup header is too short\n");
2ba45a60 DM	84	return AVERROR_INVALIDDATA;
	85	}
	86
	87	/* make sure this is the Setup header */
	88	if (buf[0] != 5) {
f6fa7814	89	av_log(s, AV_LOG_ERROR, "Wrong packet type in Setup header\n");
2ba45a60 DM	90	return AVERROR_INVALIDDATA;
	91	}
	92
	93	/* check for header signature */
	94	if (memcmp(&buf[1], "vorbis", 6)) {
f6fa7814	95	av_log(s, AV_LOG_ERROR, "Invalid packet signature in Setup header\n");
2ba45a60 DM	96	return AVERROR_INVALIDDATA;
	97	}
	98
	99	/* reverse bytes so we can easily read backwards with get_bits() */
	100	if (!(rev_buf = av_malloc(buf_size))) {
f6fa7814	101	av_log(s, AV_LOG_ERROR, "Out of memory\n");
2ba45a60 DM	102	return AVERROR(ENOMEM);
	103	}
	104	for (i = 0; i < buf_size; i++)
	105	rev_buf[i] = buf[buf_size - 1 - i];
	106	init_get_bits(&gb, rev_buf, buf_size * 8);
	107
	108	got_framing_bit = 0;
	109	while (get_bits_left(&gb) > 97) {
	110	if (get_bits1(&gb)) {
	111	got_framing_bit = get_bits_count(&gb);
	112	break;
	113	}
	114	}
	115	if (!got_framing_bit) {
f6fa7814	116	av_log(s, AV_LOG_ERROR, "Invalid Setup header\n");
2ba45a60 DM	117	ret = AVERROR_INVALIDDATA;
	118	goto bad_header;
	119	}
	120
	121	/* Now we search backwards to find possible valid mode counts. This is not
	122	* fool-proof because we could have false positive matches and read too
	123	* far, but there isn't really any way to be sure without parsing through
	124	* all the many variable-sized fields before the modes. This approach seems
	125	* to work well in testing, and it is similar to how it is handled in
	126	* liboggz. */
	127	mode_count = 0;
	128	got_mode_header = 0;
	129	while (get_bits_left(&gb) >= 97) {
	130	if (get_bits(&gb, 8) > 63 \|\| get_bits(&gb, 16) \|\| get_bits(&gb, 16))
	131	break;
	132	skip_bits(&gb, 1);
	133	mode_count++;
	134	if (mode_count > 64)
	135	break;
	136	gb0 = gb;
	137	if (get_bits(&gb0, 6) + 1 == mode_count) {
	138	got_mode_header = 1;
	139	last_mode_count = mode_count;
	140	}
	141	}
	142	if (!got_mode_header) {
f6fa7814	143	av_log(s, AV_LOG_ERROR, "Invalid Setup header\n");
2ba45a60 DM	144	ret = AVERROR_INVALIDDATA;
	145	goto bad_header;
	146	}
	147	/* All samples I've seen use <= 2 modes, so ask for a sample if we find
	148	* more than that, as it is most likely a false positive. If we get any
	149	* we may need to approach this the long way and parse the whole Setup
	150	* header, but I hope very much that it never comes to that. */
	151	if (last_mode_count > 2) {
f6fa7814	152	avpriv_request_sample(s,
2ba45a60 DM	153	"%d modes (either a false positive or a "
	154	"sample from an unknown encoder)",
	155	last_mode_count);
	156	}
	157	/* We're limiting the mode count to 63 so that we know that the previous
	158	* block flag will be in the first packet byte. */
	159	if (last_mode_count > 63) {
f6fa7814	160	av_log(s, AV_LOG_ERROR, "Unsupported mode count: %d\n",
2ba45a60 DM	161	last_mode_count);
	162	ret = AVERROR_INVALIDDATA;
	163	goto bad_header;
	164	}
	165	s->mode_count = mode_count = last_mode_count;
	166	/* Determine the number of bits required to code the mode and turn that
	167	* into a bitmask to directly access the mode from the first frame byte. */
	168	s->mode_mask = ((1 << (av_log2(mode_count - 1) + 1)) - 1) << 1;
	169	/* The previous window flag is the next bit after the mode */
	170	s->prev_mask = (s->mode_mask \| 0x1) + 1;
	171
	172	init_get_bits(&gb, rev_buf, buf_size * 8);
	173	skip_bits_long(&gb, got_framing_bit);
	174	for (i = mode_count - 1; i >= 0; i--) {
	175	skip_bits_long(&gb, 40);
	176	s->mode_blocksize[i] = get_bits1(&gb);
	177	}
	178
	179	bad_header:
	180	av_free(rev_buf);
	181	return ret;
	182	}
	183
f6fa7814 DM	184	static int vorbis_parse_init(AVVorbisParseContext *s,
f6fa7814 DM	185	const uint8_t *extradata, int extradata_size)
2ba45a60 DM	186	{
	187	uint8_t *header_start[3];
	188	int header_len[3];
	189	int ret;
	190
f6fa7814	191	s->class = &vorbis_parser_class;
2ba45a60 DM	192	s->extradata_parsed = 1;
2ba45a60 DM	193
f6fa7814 DM	194	if ((ret = avpriv_split_xiph_headers(extradata,
f6fa7814 DM	195	extradata_size, 30,
2ba45a60	196	header_start, header_len)) < 0) {
f6fa7814	197	av_log(s, AV_LOG_ERROR, "Extradata corrupt.\n");
2ba45a60 DM	198	return ret;
	199	}
	200
f6fa7814	201	if ((ret = parse_id_header(s, header_start[0], header_len[0])) < 0)
2ba45a60 DM	202	return ret;
2ba45a60 DM	203
f6fa7814	204	if ((ret = parse_setup_header(s, header_start[2], header_len[2])) < 0)
2ba45a60 DM	205	return ret;
	206
	207	s->valid_extradata = 1;
	208	s->previous_blocksize = s->blocksize[s->mode_blocksize[0]];
	209
	210	return 0;
	211	}
	212
f6fa7814 DM	213	int av_vorbis_parse_frame_flags(AVVorbisParseContext s, const uint8_t buf,
f6fa7814 DM	214	int buf_size, int *flags)
2ba45a60 DM	215	{
	216	int duration = 0;
	217
	218	if (s->valid_extradata && buf_size > 0) {
	219	int mode, current_blocksize;
	220	int previous_blocksize = s->previous_blocksize;
	221
	222	if (buf[0] & 1) {
	223	/* If the user doesn't care about special packets, it's a bad one. */
	224	if (!flags)
	225	goto bad_packet;
	226
	227	/* Set the flag for which kind of special packet it is. */
	228	if (buf[0] == 1)
	229	*flags \|= VORBIS_FLAG_HEADER;
	230	else if (buf[0] == 3)
	231	*flags \|= VORBIS_FLAG_COMMENT;
	232	else
	233	goto bad_packet;
	234
	235	/* Special packets have no duration. */
	236	return 0;
	237
	238	bad_packet:
f6fa7814	239	av_log(s, AV_LOG_ERROR, "Invalid packet\n");
2ba45a60 DM	240	return AVERROR_INVALIDDATA;
	241	}
	242	if (s->mode_count == 1)
	243	mode = 0;
	244	else
	245	mode = (buf[0] & s->mode_mask) >> 1;
	246	if (mode >= s->mode_count) {
f6fa7814	247	av_log(s, AV_LOG_ERROR, "Invalid mode in packet\n");
2ba45a60 DM	248	return AVERROR_INVALIDDATA;
	249	}
	250	if(s->mode_blocksize[mode]){
	251	int flag = !!(buf[0] & s->prev_mask);
	252	previous_blocksize = s->blocksize[flag];
	253	}
	254	current_blocksize = s->blocksize[s->mode_blocksize[mode]];
	255	duration = (previous_blocksize + current_blocksize) >> 2;
	256	s->previous_blocksize = current_blocksize;
	257	}
	258
	259	return duration;
	260	}
	261
f6fa7814 DM	262	int av_vorbis_parse_frame(AVVorbisParseContext s, const uint8_t buf,
f6fa7814 DM	263	int buf_size)
2ba45a60	264	{
f6fa7814	265	return av_vorbis_parse_frame_flags(s, buf, buf_size, NULL);
2ba45a60 DM	266	}
2ba45a60 DM	267
f6fa7814	268	void av_vorbis_parse_reset(AVVorbisParseContext *s)
2ba45a60 DM	269	{
	270	if (s->valid_extradata)
	271	s->previous_blocksize = s->blocksize[0];
	272	}
	273
f6fa7814 DM	274	void av_vorbis_parse_free(AVVorbisParseContext **s)
	275	{
	276	av_freep(s);
	277	}
	278
	279	AVVorbisParseContext av_vorbis_parse_init(const uint8_t extradata,
	280	int extradata_size)
	281	{
	282	AVVorbisParseContext s = av_mallocz(sizeof(s));
	283	int ret;
	284
	285	if (!s)
	286	return NULL;
	287
	288	ret = vorbis_parse_init(s, extradata, extradata_size);
	289	if (ret < 0) {
	290	av_vorbis_parse_free(&s);
	291	return NULL;
	292	}
	293
	294	return s;
	295	}
	296
	297	#if LIBAVCODEC_VERSION_MAJOR < 57
	298	int avpriv_vorbis_parse_extradata(AVCodecContext avctx, AVVorbisParseContext s)
	299	{
	300	return vorbis_parse_init(s, avctx->extradata, avctx->extradata_size);
	301	}
	302	void avpriv_vorbis_parse_reset(AVVorbisParseContext *s)
	303	{
	304	av_vorbis_parse_reset(s);
	305	}
	306	int avpriv_vorbis_parse_frame(AVVorbisParseContext s, const uint8_t buf,
	307	int buf_size)
	308	{
	309	return av_vorbis_parse_frame(s, buf, buf_size);
	310	}
	311	int avpriv_vorbis_parse_frame_flags(AVVorbisParseContext s, const uint8_t buf,
	312	int buf_size, int *flags)
	313	{
	314	return av_vorbis_parse_frame_flags(s, buf, buf_size, flags);
	315	}
	316	#endif
	317
2ba45a60	318	#if CONFIG_VORBIS_PARSER
f6fa7814 DM	319
	320	typedef struct VorbisParseContext {
	321	AVVorbisParseContext *vp;
	322	} VorbisParseContext;
	323
2ba45a60 DM	324	static int vorbis_parse(AVCodecParserContext s1, AVCodecContext avctx,
	325	const uint8_t *poutbuf, int poutbuf_size,
	326	const uint8_t *buf, int buf_size)
	327	{
	328	VorbisParseContext *s = s1->priv_data;
	329	int duration;
	330
f6fa7814 DM	331	if (!s->vp && avctx->extradata && avctx->extradata_size) {
	332	s->vp = av_vorbis_parse_init(avctx->extradata, avctx->extradata_size);
	333	}
	334	if (!s->vp)
	335	goto end;
2ba45a60	336
f6fa7814	337	if ((duration = av_vorbis_parse_frame(s->vp, buf, buf_size)) >= 0)
2ba45a60 DM	338	s1->duration = duration;
	339
	340	end:
	341	/* always return the full packet. this parser isn't doing any splitting or
	342	combining, only packet analysis */
	343	*poutbuf = buf;
	344	*poutbuf_size = buf_size;
	345	return buf_size;
	346	}
	347
f6fa7814 DM	348	static void vorbis_parser_close(AVCodecParserContext *ctx)
	349	{
	350	VorbisParseContext *s = ctx->priv_data;
	351	av_vorbis_parse_free(&s->vp);
	352	}
	353
2ba45a60 DM	354	AVCodecParser ff_vorbis_parser = {
	355	.codec_ids = { AV_CODEC_ID_VORBIS },
	356	.priv_data_size = sizeof(VorbisParseContext),
	357	.parser_parse = vorbis_parse,
f6fa7814	358	.parser_close = vorbis_parser_close,
2ba45a60 DM	359	};
2ba45a60 DM	360	#endif /* CONFIG_VORBIS_PARSER */