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

/*
 * Copyright (c) 2012 Andrew D'Addesio
 * Copyright (c) 2013-2014 Mozilla Corporation
 *
 * 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
 * Opus decoder/parser shared code
 */

#include <stdint.h>

#include "libavutil/error.h"

#include "opus.h"
#include "vorbis.h"

static const uint16_t opus_frame_duration[32] = {
    480, 960, 1920, 2880,
    480, 960, 1920, 2880,
    480, 960, 1920, 2880,
    480, 960,
    480, 960,
    120, 240,  480,  960,
    120, 240,  480,  960,
    120, 240,  480,  960,
    120, 240,  480,  960,
};

/**
 * Read a 1- or 2-byte frame length
 */
static inline int xiph_lacing_16bit(const uint8_t **ptr, const uint8_t *end)
{
    int val;

    if (*ptr >= end)
        return AVERROR_INVALIDDATA;
    val = *(*ptr)++;
    if (val >= 252) {
        if (*ptr >= end)
            return AVERROR_INVALIDDATA;
        val += 4 * *(*ptr)++;
    }
    return val;
}

/**
 * Read a multi-byte length (used for code 3 packet padding size)
 */
static inline int xiph_lacing_full(const uint8_t **ptr, const uint8_t *end)
{
    int val = 0;
    int next;

    while (1) {
        if (*ptr >= end || val > INT_MAX - 254)
            return AVERROR_INVALIDDATA;
        next = *(*ptr)++;
        val += next;
        if (next < 255)
            break;
        else
            val--;
    }
    return val;
}

/**
 * Parse Opus packet info from raw packet data
 */
int ff_opus_parse_packet(OpusPacket *pkt, const uint8_t *buf, int buf_size,
                         int self_delimiting)
{
    const uint8_t *ptr = buf;
    const uint8_t *end = buf + buf_size;
    int padding = 0;
    int frame_bytes, i;

    if (buf_size < 1)
        goto fail;

    /* TOC byte */
    i = *ptr++;
    pkt->code   = (i     ) & 0x3;
    pkt->stereo = (i >> 2) & 0x1;
    pkt->config = (i >> 3) & 0x1F;

    /* code 2 and code 3 packets have at least 1 byte after the TOC */
    if (pkt->code >= 2 && buf_size < 2)
        goto fail;

    switch (pkt->code) {
    case 0:
        /* 1 frame */
        pkt->frame_count = 1;
        pkt->vbr         = 0;

        if (self_delimiting) {
            int len = xiph_lacing_16bit(&ptr, end);
            if (len < 0 || len > end - ptr)
                goto fail;
            end      = ptr + len;
            buf_size = end - buf;
        }

        frame_bytes = end - ptr;
        if (frame_bytes > MAX_FRAME_SIZE)
            goto fail;
        pkt->frame_offset[0] = ptr - buf;
        pkt->frame_size[0]   = frame_bytes;
        break;
    case 1:
        /* 2 frames, equal size */
        pkt->frame_count = 2;
        pkt->vbr         = 0;

        if (self_delimiting) {
            int len = xiph_lacing_16bit(&ptr, end);
            if (len < 0 || 2 * len > end - ptr)
                goto fail;
            end      = ptr + 2 * len;
            buf_size = end - buf;
        }

        frame_bytes = end - ptr;
        if (frame_bytes & 1 || frame_bytes >> 1 > MAX_FRAME_SIZE)
            goto fail;
        pkt->frame_offset[0] = ptr - buf;
        pkt->frame_size[0]   = frame_bytes >> 1;
        pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0];
        pkt->frame_size[1]   = frame_bytes >> 1;
        break;
    case 2:
        /* 2 frames, different sizes */
        pkt->frame_count = 2;
        pkt->vbr         = 1;

        /* read 1st frame size */
        frame_bytes = xiph_lacing_16bit(&ptr, end);
        if (frame_bytes < 0)
            goto fail;

        if (self_delimiting) {
            int len = xiph_lacing_16bit(&ptr, end);
            if (len < 0 || len + frame_bytes > end - ptr)
                goto fail;
            end      = ptr + frame_bytes + len;
            buf_size = end - buf;
        }

        pkt->frame_offset[0] = ptr - buf;
        pkt->frame_size[0]   = frame_bytes;

        /* calculate 2nd frame size */
        frame_bytes = end - ptr - pkt->frame_size[0];
        if (frame_bytes < 0 || frame_bytes > MAX_FRAME_SIZE)
            goto fail;
        pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0];
        pkt->frame_size[1]   = frame_bytes;
        break;
    case 3:
        /* 1 to 48 frames, can be different sizes */
        i = *ptr++;
        pkt->frame_count = (i     ) & 0x3F;
        padding          = (i >> 6) & 0x01;
        pkt->vbr         = (i >> 7) & 0x01;

        if (pkt->frame_count == 0 || pkt->frame_count > MAX_FRAMES)
            goto fail;

        /* read padding size */
        if (padding) {
            padding = xiph_lacing_full(&ptr, end);
            if (padding < 0)
                goto fail;
        }

        /* read frame sizes */
        if (pkt->vbr) {
            /* for VBR, all frames except the final one have their size coded
               in the bitstream. the last frame size is implicit. */
            int total_bytes = 0;
            for (i = 0; i < pkt->frame_count - 1; i++) {
                frame_bytes = xiph_lacing_16bit(&ptr, end);
                if (frame_bytes < 0)
                    goto fail;
                pkt->frame_size[i] = frame_bytes;
                total_bytes += frame_bytes;
            }

            if (self_delimiting) {
                int len = xiph_lacing_16bit(&ptr, end);
                if (len < 0 || len + total_bytes + padding > end - ptr)
                    goto fail;
                end      = ptr + total_bytes + len + padding;
                buf_size = end - buf;
            }

            frame_bytes = end - ptr - padding;
            if (total_bytes > frame_bytes)
                goto fail;
            pkt->frame_offset[0] = ptr - buf;
            for (i = 1; i < pkt->frame_count; i++)
                pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1];
            pkt->frame_size[pkt->frame_count-1] = frame_bytes - total_bytes;
        } else {
            /* for CBR, the remaining packet bytes are divided evenly between
               the frames */
            if (self_delimiting) {
                frame_bytes = xiph_lacing_16bit(&ptr, end);
                if (frame_bytes < 0 || pkt->frame_count * frame_bytes + padding > end - ptr)
                    goto fail;
                end      = ptr + pkt->frame_count * frame_bytes + padding;
                buf_size = end - buf;
            } else {
                frame_bytes = end - ptr - padding;
                if (frame_bytes % pkt->frame_count ||
                    frame_bytes / pkt->frame_count > MAX_FRAME_SIZE)
                    goto fail;
                frame_bytes /= pkt->frame_count;
            }

            pkt->frame_offset[0] = ptr - buf;
            pkt->frame_size[0]   = frame_bytes;
            for (i = 1; i < pkt->frame_count; i++) {
                pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1];
                pkt->frame_size[i]   = frame_bytes;
            }
        }
    }

    pkt->packet_size = buf_size;
    pkt->data_size   = pkt->packet_size - padding;

    /* total packet duration cannot be larger than 120ms */
    pkt->frame_duration = opus_frame_duration[pkt->config];
    if (pkt->frame_duration * pkt->frame_count > MAX_PACKET_DUR)
        goto fail;

    /* set mode and bandwidth */
    if (pkt->config < 12) {
        pkt->mode = OPUS_MODE_SILK;
        pkt->bandwidth = pkt->config >> 2;
    } else if (pkt->config < 16) {
        pkt->mode = OPUS_MODE_HYBRID;
        pkt->bandwidth = OPUS_BANDWIDTH_SUPERWIDEBAND + (pkt->config >= 14);
    } else {
        pkt->mode = OPUS_MODE_CELT;
        pkt->bandwidth = (pkt->config - 16) >> 2;
        /* skip mediumband */
        if (pkt->bandwidth)
            pkt->bandwidth++;
    }

    return 0;

fail:
    memset(pkt, 0, sizeof(*pkt));
    return AVERROR_INVALIDDATA;
}

static int channel_reorder_vorbis(int nb_channels, int channel_idx)
{
    return ff_vorbis_channel_layout_offsets[nb_channels - 1][channel_idx];
}

static int channel_reorder_unknown(int nb_channels, int channel_idx)
{
    return channel_idx;
}

av_cold int ff_opus_parse_extradata(AVCodecContext *avctx,
                                    OpusContext *s)
{
    static const uint8_t default_channel_map[2] = { 0, 1 };
    uint8_t default_extradata[19] = {
        'O', 'p', 'u', 's', 'H', 'e', 'a', 'd',
        1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    };

    int (*channel_reorder)(int, int) = channel_reorder_unknown;

    const uint8_t *extradata, *channel_map;
    int extradata_size;
    int version, channels, map_type, streams, stereo_streams, i, j;
    uint64_t layout;

    if (!avctx->extradata) {
        if (avctx->channels > 2) {
            av_log(avctx, AV_LOG_ERROR,
                   "Multichannel configuration without extradata.\n");
            return AVERROR(EINVAL);
        }
        default_extradata[9] = (avctx->channels == 1) ? 1 : 2;
        extradata      = default_extradata;
        extradata_size = sizeof(default_extradata);
    } else {
        extradata = avctx->extradata;
        extradata_size = avctx->extradata_size;
    }

    if (extradata_size < 19) {
        av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n",
               extradata_size);
        return AVERROR_INVALIDDATA;
    }

    version = extradata[8];
    if (version > 15) {
        avpriv_request_sample(avctx, "Extradata version %d", version);
        return AVERROR_PATCHWELCOME;
    }

    avctx->delay = AV_RL16(extradata + 10);

    channels = extradata[9];
    if (!channels) {
        av_log(avctx, AV_LOG_ERROR, "Zero channel count specified in the extadata\n");
        return AVERROR_INVALIDDATA;
    }

    s->gain_i = AV_RL16(extradata + 16);
    if (s->gain_i)
        s->gain = pow(10, s->gain_i / (20.0 * 256));

    map_type = extradata[18];
    if (!map_type) {
        if (channels > 2) {
            av_log(avctx, AV_LOG_ERROR,
                   "Channel mapping 0 is only specified for up to 2 channels\n");
            return AVERROR_INVALIDDATA;
        }
        layout         = (channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
        streams        = 1;
        stereo_streams = channels - 1;
        channel_map    = default_channel_map;
    } else if (map_type == 1 || map_type == 255) {
        if (extradata_size < 21 + channels) {
            av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n",
                   extradata_size);
            return AVERROR_INVALIDDATA;
        }

        streams        = extradata[19];
        stereo_streams = extradata[20];
        if (!streams || stereo_streams > streams ||
            streams + stereo_streams > 255) {
            av_log(avctx, AV_LOG_ERROR,
                   "Invalid stream/stereo stream count: %d/%d\n", streams, stereo_streams);
            return AVERROR_INVALIDDATA;
        }

        if (map_type == 1) {
            if (channels > 8) {
                av_log(avctx, AV_LOG_ERROR,
                       "Channel mapping 1 is only specified for up to 8 channels\n");
                return AVERROR_INVALIDDATA;
            }
            layout = ff_vorbis_channel_layouts[channels - 1];
            channel_reorder = channel_reorder_vorbis;
        } else
            layout = 0;

        channel_map = extradata + 21;
    } else {
        avpriv_request_sample(avctx, "Mapping type %d", map_type);
        return AVERROR_PATCHWELCOME;
    }

    s->channel_maps = av_mallocz_array(channels, sizeof(*s->channel_maps));
    if (!s->channel_maps)
        return AVERROR(ENOMEM);

    for (i = 0; i < channels; i++) {
        ChannelMap *map = &s->channel_maps[i];
        uint8_t     idx = channel_map[channel_reorder(channels, i)];

        if (idx == 255) {
            map->silence = 1;
            continue;
        } else if (idx >= streams + stereo_streams) {
            av_log(avctx, AV_LOG_ERROR,
                   "Invalid channel map for output channel %d: %d\n", i, idx);
            return AVERROR_INVALIDDATA;
        }

        /* check that we din't see this index yet */
        map->copy = 0;
        for (j = 0; j < i; j++)
            if (channel_map[channel_reorder(channels, j)] == idx) {
                map->copy     = 1;
                map->copy_idx = j;
                break;
            }

        if (idx < 2 * stereo_streams) {
            map->stream_idx  = idx / 2;
            map->channel_idx = idx & 1;
        } else {
            map->stream_idx  = idx - stereo_streams;
            map->channel_idx = 0;
        }
    }

    avctx->channels       = channels;
    avctx->channel_layout = layout;
    s->nb_streams         = streams;
    s->nb_stereo_streams  = stereo_streams;

    return 0;
}
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* Copyright (c) 2012 Andrew D'Addesio
	3	* Copyright (c) 2013-2014 Mozilla Corporation
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	/**
	23	* @file
	24	* Opus decoder/parser shared code
	25	*/
	26
	27	#include <stdint.h>
	28
	29	#include "libavutil/error.h"
	30
	31	#include "opus.h"
	32	#include "vorbis.h"
	33
	34	static const uint16_t opus_frame_duration[32] = {
	35	480, 960, 1920, 2880,
	36	480, 960, 1920, 2880,
	37	480, 960, 1920, 2880,
	38	480, 960,
	39	480, 960,
	40	120, 240, 480, 960,
	41	120, 240, 480, 960,
	42	120, 240, 480, 960,
	43	120, 240, 480, 960,
	44	};
	45
	46	/**
	47	* Read a 1- or 2-byte frame length
	48	*/
	49	static inline int xiph_lacing_16bit(const uint8_t *ptr, const uint8_t end)
	50	{
	51	int val;
	52
	53	if (*ptr >= end)
	54	return AVERROR_INVALIDDATA;
	55	val = (ptr)++;
	56	if (val >= 252) {
	57	if (*ptr >= end)
	58	return AVERROR_INVALIDDATA;
	59	val += 4 * (ptr)++;
	60	}
	61	return val;
	62	}
	63
	64	/**
65	* Read a multi-byte length (used for code 3 packet padding size)
66	*/
67	static inline int xiph_lacing_full(const uint8_t *ptr, const uint8_t end)
68	{
69	int val = 0;
70	int next;
71
72	while (1) {
73	if (*ptr >= end \|\| val > INT_MAX - 254)
74	return AVERROR_INVALIDDATA;
75	next = (ptr)++;
76	val += next;
77	if (next < 255)
78	break;
79	else
80	val--;
81	}
82	return val;
83	}
84
85	/**
86	* Parse Opus packet info from raw packet data
87	*/
88	int ff_opus_parse_packet(OpusPacket pkt, const uint8_t buf, int buf_size,
89	int self_delimiting)
90	{
91	const uint8_t *ptr = buf;
92	const uint8_t *end = buf + buf_size;
93	int padding = 0;
94	int frame_bytes, i;
95
96	if (buf_size < 1)
97	goto fail;
98
99	/* TOC byte */
100	i = *ptr++;
101	pkt->code = (i ) & 0x3;
102	pkt->stereo = (i >> 2) & 0x1;
103	pkt->config = (i >> 3) & 0x1F;
104
105	/* code 2 and code 3 packets have at least 1 byte after the TOC */
106	if (pkt->code >= 2 && buf_size < 2)
107	goto fail;
108
109	switch (pkt->code) {
110	case 0:
111	/* 1 frame */
112	pkt->frame_count = 1;
113	pkt->vbr = 0;
114
115	if (self_delimiting) {
116	int len = xiph_lacing_16bit(&ptr, end);
117	if (len < 0 \|\| len > end - ptr)
118	goto fail;
119	end = ptr + len;
120	buf_size = end - buf;
121	}
122
123	frame_bytes = end - ptr;
124	if (frame_bytes > MAX_FRAME_SIZE)
125	goto fail;
126	pkt->frame_offset[0] = ptr - buf;
127	pkt->frame_size[0] = frame_bytes;
128	break;
129	case 1:
130	/* 2 frames, equal size */
131	pkt->frame_count = 2;
132	pkt->vbr = 0;
133
134	if (self_delimiting) {
135	int len = xiph_lacing_16bit(&ptr, end);
136	if (len < 0 \|\| 2 * len > end - ptr)
137	goto fail;
138	end = ptr + 2 * len;
139	buf_size = end - buf;
140	}
141
142	frame_bytes = end - ptr;
143	if (frame_bytes & 1 \|\| frame_bytes >> 1 > MAX_FRAME_SIZE)
144	goto fail;
145	pkt->frame_offset[0] = ptr - buf;
146	pkt->frame_size[0] = frame_bytes >> 1;
147	pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0];
148	pkt->frame_size[1] = frame_bytes >> 1;
149	break;
150	case 2:
151	/* 2 frames, different sizes */
152	pkt->frame_count = 2;
153	pkt->vbr = 1;
154
155	/* read 1st frame size */
156	frame_bytes = xiph_lacing_16bit(&ptr, end);
157	if (frame_bytes < 0)
158	goto fail;
159
160	if (self_delimiting) {
161	int len = xiph_lacing_16bit(&ptr, end);
162	if (len < 0 \|\| len + frame_bytes > end - ptr)
163	goto fail;
164	end = ptr + frame_bytes + len;
165	buf_size = end - buf;
166	}
167
168	pkt->frame_offset[0] = ptr - buf;
169	pkt->frame_size[0] = frame_bytes;
170
171	/* calculate 2nd frame size */
172	frame_bytes = end - ptr - pkt->frame_size[0];
173	if (frame_bytes < 0 \|\| frame_bytes > MAX_FRAME_SIZE)
174	goto fail;
175	pkt->frame_offset[1] = pkt->frame_offset[0] + pkt->frame_size[0];
176	pkt->frame_size[1] = frame_bytes;
177	break;
178	case 3:
179	/* 1 to 48 frames, can be different sizes */
180	i = *ptr++;
181	pkt->frame_count = (i ) & 0x3F;
182	padding = (i >> 6) & 0x01;
183	pkt->vbr = (i >> 7) & 0x01;
184
185	if (pkt->frame_count == 0 \|\| pkt->frame_count > MAX_FRAMES)
186	goto fail;
187
188	/* read padding size */
189	if (padding) {
190	padding = xiph_lacing_full(&ptr, end);
191	if (padding < 0)
192	goto fail;
193	}
194
195	/* read frame sizes */
196	if (pkt->vbr) {
197	/* for VBR, all frames except the final one have their size coded
198	in the bitstream. the last frame size is implicit. */
199	int total_bytes = 0;
200	for (i = 0; i < pkt->frame_count - 1; i++) {
201	frame_bytes = xiph_lacing_16bit(&ptr, end);
202	if (frame_bytes < 0)
203	goto fail;
204	pkt->frame_size[i] = frame_bytes;
205	total_bytes += frame_bytes;
206	}
207
208	if (self_delimiting) {
209	int len = xiph_lacing_16bit(&ptr, end);
210	if (len < 0 \|\| len + total_bytes + padding > end - ptr)
211	goto fail;
212	end = ptr + total_bytes + len + padding;
213	buf_size = end - buf;
214	}
215
216	frame_bytes = end - ptr - padding;
217	if (total_bytes > frame_bytes)
218	goto fail;
219	pkt->frame_offset[0] = ptr - buf;
220	for (i = 1; i < pkt->frame_count; i++)
221	pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1];
222	pkt->frame_size[pkt->frame_count-1] = frame_bytes - total_bytes;
223	} else {
224	/* for CBR, the remaining packet bytes are divided evenly between
225	the frames */
226	if (self_delimiting) {
227	frame_bytes = xiph_lacing_16bit(&ptr, end);
228	if (frame_bytes < 0 \|\| pkt->frame_count * frame_bytes + padding > end - ptr)
229	goto fail;
230	end = ptr + pkt->frame_count * frame_bytes + padding;
231	buf_size = end - buf;
232	} else {
233	frame_bytes = end - ptr - padding;
234	if (frame_bytes % pkt->frame_count \|\|
235	frame_bytes / pkt->frame_count > MAX_FRAME_SIZE)
236	goto fail;
237	frame_bytes /= pkt->frame_count;
238	}
239
240	pkt->frame_offset[0] = ptr - buf;
241	pkt->frame_size[0] = frame_bytes;
242	for (i = 1; i < pkt->frame_count; i++) {
243	pkt->frame_offset[i] = pkt->frame_offset[i-1] + pkt->frame_size[i-1];
244	pkt->frame_size[i] = frame_bytes;
245	}
246	}
247	}
248
249	pkt->packet_size = buf_size;
250	pkt->data_size = pkt->packet_size - padding;
251
252	/* total packet duration cannot be larger than 120ms */
253	pkt->frame_duration = opus_frame_duration[pkt->config];
254	if (pkt->frame_duration * pkt->frame_count > MAX_PACKET_DUR)
255	goto fail;
256
257	/* set mode and bandwidth */
258	if (pkt->config < 12) {
259	pkt->mode = OPUS_MODE_SILK;
260	pkt->bandwidth = pkt->config >> 2;
261	} else if (pkt->config < 16) {
262	pkt->mode = OPUS_MODE_HYBRID;
263	pkt->bandwidth = OPUS_BANDWIDTH_SUPERWIDEBAND + (pkt->config >= 14);
264	} else {
265	pkt->mode = OPUS_MODE_CELT;
266	pkt->bandwidth = (pkt->config - 16) >> 2;
267	/* skip mediumband */
268	if (pkt->bandwidth)
269	pkt->bandwidth++;
270	}
271
272	return 0;
273
274	fail:
275	memset(pkt, 0, sizeof(*pkt));
276	return AVERROR_INVALIDDATA;
277	}
278
279	static int channel_reorder_vorbis(int nb_channels, int channel_idx)
280	{
281	return ff_vorbis_channel_layout_offsets[nb_channels - 1][channel_idx];
282	}
283
284	static int channel_reorder_unknown(int nb_channels, int channel_idx)
285	{
286	return channel_idx;
287	}
288
289	av_cold int ff_opus_parse_extradata(AVCodecContext *avctx,
290	OpusContext *s)
291	{
292	static const uint8_t default_channel_map[2] = { 0, 1 };
293	uint8_t default_extradata[19] = {
294	'O', 'p', 'u', 's', 'H', 'e', 'a', 'd',
295	1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
296	};
297
298	int (*channel_reorder)(int, int) = channel_reorder_unknown;
299
300	const uint8_t extradata, channel_map;
301	int extradata_size;
302	int version, channels, map_type, streams, stereo_streams, i, j;
303	uint64_t layout;
304
305	if (!avctx->extradata) {
306	if (avctx->channels > 2) {
307	av_log(avctx, AV_LOG_ERROR,
308	"Multichannel configuration without extradata.\n");
309	return AVERROR(EINVAL);
310	}
311	default_extradata[9] = (avctx->channels == 1) ? 1 : 2;
312	extradata = default_extradata;
313	extradata_size = sizeof(default_extradata);
314	} else {
315	extradata = avctx->extradata;
316	extradata_size = avctx->extradata_size;
317	}
318
319	if (extradata_size < 19) {
320	av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n",
321	extradata_size);
322	return AVERROR_INVALIDDATA;
323	}
324
325	version = extradata[8];
326	if (version > 15) {
327	avpriv_request_sample(avctx, "Extradata version %d", version);
328	return AVERROR_PATCHWELCOME;
329	}
330
331	avctx->delay = AV_RL16(extradata + 10);
332
333	channels = extradata[9];
334	if (!channels) {
335	av_log(avctx, AV_LOG_ERROR, "Zero channel count specified in the extadata\n");
336	return AVERROR_INVALIDDATA;
337	}
338
339	s->gain_i = AV_RL16(extradata + 16);
340	if (s->gain_i)
341	s->gain = pow(10, s->gain_i / (20.0 * 256));
342
343	map_type = extradata[18];
344	if (!map_type) {
345	if (channels > 2) {
346	av_log(avctx, AV_LOG_ERROR,
347	"Channel mapping 0 is only specified for up to 2 channels\n");
348	return AVERROR_INVALIDDATA;
349	}
350	layout = (channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
351	streams = 1;
352	stereo_streams = channels - 1;
353	channel_map = default_channel_map;
354	} else if (map_type == 1 \|\| map_type == 255) {
355	if (extradata_size < 21 + channels) {
356	av_log(avctx, AV_LOG_ERROR, "Invalid extradata size: %d\n",
357	extradata_size);
358	return AVERROR_INVALIDDATA;
359	}
360
361	streams = extradata[19];
362	stereo_streams = extradata[20];
363	if (!streams \|\| stereo_streams > streams \|\|
364	streams + stereo_streams > 255) {
365	av_log(avctx, AV_LOG_ERROR,
366	"Invalid stream/stereo stream count: %d/%d\n", streams, stereo_streams);
367	return AVERROR_INVALIDDATA;
368	}
369
370	if (map_type == 1) {
371	if (channels > 8) {
372	av_log(avctx, AV_LOG_ERROR,
373	"Channel mapping 1 is only specified for up to 8 channels\n");
374	return AVERROR_INVALIDDATA;
375	}
376	layout = ff_vorbis_channel_layouts[channels - 1];
377	channel_reorder = channel_reorder_vorbis;
378	} else
379	layout = 0;
380
381	channel_map = extradata + 21;
382	} else {
383	avpriv_request_sample(avctx, "Mapping type %d", map_type);
384	return AVERROR_PATCHWELCOME;
385	}
386
387	s->channel_maps = av_mallocz_array(channels, sizeof(*s->channel_maps));
388	if (!s->channel_maps)
389	return AVERROR(ENOMEM);
390
391	for (i = 0; i < channels; i++) {
392	ChannelMap *map = &s->channel_maps[i];
393	uint8_t idx = channel_map[channel_reorder(channels, i)];
394
395	if (idx == 255) {
396	map->silence = 1;
397	continue;
398	} else if (idx >= streams + stereo_streams) {
399	av_log(avctx, AV_LOG_ERROR,
400	"Invalid channel map for output channel %d: %d\n", i, idx);
401	return AVERROR_INVALIDDATA;
402	}
403
404	/* check that we din't see this index yet */
405	map->copy = 0;
406	for (j = 0; j < i; j++)
407	if (channel_map[channel_reorder(channels, j)] == idx) {
408	map->copy = 1;
409	map->copy_idx = j;
410	break;
411	}
412
413	if (idx < 2 * stereo_streams) {
414	map->stream_idx = idx / 2;
415	map->channel_idx = idx & 1;
416	} else {
417	map->stream_idx = idx - stereo_streams;
418	map->channel_idx = 0;
419	}
420	}
421
422	avctx->channels = channels;
423	avctx->channel_layout = layout;
424	s->nb_streams = streams;
425	s->nb_stereo_streams = stereo_streams;
426
427	return 0;
428	}