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

/*
 * AIFF/AIFF-C demuxer
 * Copyright (c) 2006  Patrick Guimond
 *
 * 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 "libavutil/intreadwrite.h"
#include "libavutil/mathematics.h"
#include "libavutil/dict.h"
#include "avformat.h"
#include "internal.h"
#include "pcm.h"
#include "aiff.h"
#include "isom.h"
#include "id3v2.h"
#include "mov_chan.h"

#define AIFF                    0
#define AIFF_C_VERSION1         0xA2805140

typedef struct {
    int64_t data_end;
    int block_duration;
} AIFFInputContext;

static enum AVCodecID aiff_codec_get_id(int bps)
{
    if (bps <= 8)
        return AV_CODEC_ID_PCM_S8;
    if (bps <= 16)
        return AV_CODEC_ID_PCM_S16BE;
    if (bps <= 24)
        return AV_CODEC_ID_PCM_S24BE;
    if (bps <= 32)
        return AV_CODEC_ID_PCM_S32BE;

    /* bigger than 32 isn't allowed  */
    return AV_CODEC_ID_NONE;
}

/* returns the size of the found tag */
static int get_tag(AVIOContext *pb, uint32_t * tag)
{
    int size;

    if (avio_feof(pb))
        return AVERROR(EIO);

    *tag = avio_rl32(pb);
    size = avio_rb32(pb);

    if (size < 0)
        size = 0x7fffffff;

    return size;
}

/* Metadata string read */
static void get_meta(AVFormatContext *s, const char *key, int size)
{
    uint8_t *str = av_malloc(size+1);

    if (str) {
        int res = avio_read(s->pb, str, size);
        if (res < 0){
            av_free(str);
            return;
        }
        size += (size&1)-res;
        str[res] = 0;
        av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
    }else
        size+= size&1;

    avio_skip(s->pb, size);
}

/* Returns the number of sound data frames or negative on error */
static unsigned int get_aiff_header(AVFormatContext *s, int size,
                                    unsigned version)
{
    AVIOContext *pb        = s->pb;
    AVCodecContext *codec  = s->streams[0]->codec;
    AIFFInputContext *aiff = s->priv_data;
    int exp;
    uint64_t val;
    double sample_rate;
    unsigned int num_frames;

    if (size & 1)
        size++;
    codec->codec_type = AVMEDIA_TYPE_AUDIO;
    codec->channels = avio_rb16(pb);
    num_frames = avio_rb32(pb);
    codec->bits_per_coded_sample = avio_rb16(pb);

    exp = avio_rb16(pb);
    val = avio_rb64(pb);
    sample_rate = ldexp(val, exp - 16383 - 63);
    codec->sample_rate = sample_rate;
    size -= 18;

    /* get codec id for AIFF-C */
    if (version == AIFF_C_VERSION1) {
        codec->codec_tag = avio_rl32(pb);
        codec->codec_id  = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
        size -= 4;
    }

    if (version != AIFF_C_VERSION1 || codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
        codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
        codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
        aiff->block_duration = 1;
    } else {
        switch (codec->codec_id) {
        case AV_CODEC_ID_PCM_F32BE:
        case AV_CODEC_ID_PCM_F64BE:
        case AV_CODEC_ID_PCM_S16LE:
        case AV_CODEC_ID_PCM_ALAW:
        case AV_CODEC_ID_PCM_MULAW:
            aiff->block_duration = 1;
            break;
        case AV_CODEC_ID_ADPCM_IMA_QT:
            codec->block_align = 34*codec->channels;
            break;
        case AV_CODEC_ID_MACE3:
            codec->block_align = 2*codec->channels;
            break;
        case AV_CODEC_ID_ADPCM_G726LE:
            codec->bits_per_coded_sample = 5;
        case AV_CODEC_ID_ADPCM_G722:
        case AV_CODEC_ID_MACE6:
            codec->block_align = 1*codec->channels;
            break;
        case AV_CODEC_ID_GSM:
            codec->block_align = 33;
            break;
        default:
            aiff->block_duration = 1;
            break;
        }
        if (codec->block_align > 0)
            aiff->block_duration = av_get_audio_frame_duration(codec,
                                                               codec->block_align);
    }

    /* Block align needs to be computed in all cases, as the definition
     * is specific to applications -> here we use the WAVE format definition */
    if (!codec->block_align)
        codec->block_align = (av_get_bits_per_sample(codec->codec_id) * codec->channels) >> 3;

    if (aiff->block_duration) {
        codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
                          aiff->block_duration;
    }

    /* Chunk is over */
    if (size)
        avio_skip(pb, size);

    return num_frames;
}

static int aiff_probe(AVProbeData *p)
{
    /* check file header */
    if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
        p->buf[2] == 'R' && p->buf[3] == 'M' &&
        p->buf[8] == 'A' && p->buf[9] == 'I' &&
        p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
        return AVPROBE_SCORE_MAX;
    else
        return 0;
}

/* aiff input */
static int aiff_read_header(AVFormatContext *s)
{
    int ret, size, filesize;
    int64_t offset = 0, position;
    uint32_t tag;
    unsigned version = AIFF_C_VERSION1;
    AVIOContext *pb = s->pb;
    AVStream * st;
    AIFFInputContext *aiff = s->priv_data;
    ID3v2ExtraMeta *id3v2_extra_meta = NULL;

    /* check FORM header */
    filesize = get_tag(pb, &tag);
    if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
        return AVERROR_INVALIDDATA;

    /* AIFF data type */
    tag = avio_rl32(pb);
    if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */
        version = AIFF;
    else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */
        return AVERROR_INVALIDDATA;

    filesize -= 4;

    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);

    while (filesize > 0) {
        /* parse different chunks */
        size = get_tag(pb, &tag);
        if (size < 0)
            return size;

        filesize -= size + 8;

        switch (tag) {
        case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */
            /* Then for the complete header info */
            st->nb_frames = get_aiff_header(s, size, version);
            if (st->nb_frames < 0)
                return st->nb_frames;
            if (offset > 0) // COMM is after SSND
                goto got_sound;
            break;
        case MKTAG('I', 'D', '3', ' '):
            position = avio_tell(pb);
            ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
            if (id3v2_extra_meta)
                if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {
                    ff_id3v2_free_extra_meta(&id3v2_extra_meta);
                    return ret;
                }
            ff_id3v2_free_extra_meta(&id3v2_extra_meta);
            if (position + size > avio_tell(pb))
                avio_skip(pb, position + size - avio_tell(pb));
            break;
        case MKTAG('F', 'V', 'E', 'R'):     /* Version chunk */
            version = avio_rb32(pb);
            break;
        case MKTAG('N', 'A', 'M', 'E'):     /* Sample name chunk */
            get_meta(s, "title"    , size);
            break;
        case MKTAG('A', 'U', 'T', 'H'):     /* Author chunk */
            get_meta(s, "author"   , size);
            break;
        case MKTAG('(', 'c', ')', ' '):     /* Copyright chunk */
            get_meta(s, "copyright", size);
            break;
        case MKTAG('A', 'N', 'N', 'O'):     /* Annotation chunk */
            get_meta(s, "comment"  , size);
            break;
        case MKTAG('S', 'S', 'N', 'D'):     /* Sampled sound chunk */
            aiff->data_end = avio_tell(pb) + size;
            offset = avio_rb32(pb);      /* Offset of sound data */
            avio_rb32(pb);               /* BlockSize... don't care */
            offset += avio_tell(pb);    /* Compute absolute data offset */
            if (st->codec->block_align && !pb->seekable)    /* Assume COMM already parsed */
                goto got_sound;
            if (!pb->seekable) {
                av_log(s, AV_LOG_ERROR, "file is not seekable\n");
                return -1;
            }
            avio_skip(pb, size - 8);
            break;
        case MKTAG('w', 'a', 'v', 'e'):
            if ((uint64_t)size > (1<<30))
                return -1;
            if (ff_get_extradata(st->codec, pb, size) < 0)
                return AVERROR(ENOMEM);
            if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align) {
                st->codec->block_align = AV_RB32(st->codec->extradata+11*4);
                aiff->block_duration = AV_RB32(st->codec->extradata+9*4);
            } else if (st->codec->codec_id == AV_CODEC_ID_QCELP) {
                char rate = 0;
                if (size >= 25)
                    rate = st->codec->extradata[24];
                switch (rate) {
                case 'H': // RATE_HALF
                    st->codec->block_align = 17;
                    break;
                case 'F': // RATE_FULL
                default:
                    st->codec->block_align = 35;
                }
                aiff->block_duration = 160;
                st->codec->bit_rate = st->codec->sample_rate * (st->codec->block_align << 3) /
                                      aiff->block_duration;
            }
            break;
        case MKTAG('C','H','A','N'):
            if(ff_mov_read_chan(s, pb, st, size) < 0)
                return AVERROR_INVALIDDATA;
            break;
        default: /* Jump */
            if (size & 1)   /* Always even aligned */
                size++;
            avio_skip(pb, size);
        }
    }

got_sound:
    if (!st->codec->block_align) {
        av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
        return -1;
    }

    /* Now positioned, get the sound data start and end */
    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
    st->start_time = 0;
    st->duration = st->nb_frames * aiff->block_duration;

    /* Position the stream at the first block */
    avio_seek(pb, offset, SEEK_SET);

    return 0;
}

#define MAX_SIZE 4096

static int aiff_read_packet(AVFormatContext *s,
                            AVPacket *pkt)
{
    AVStream *st = s->streams[0];
    AIFFInputContext *aiff = s->priv_data;
    int64_t max_size;
    int res, size;

    /* calculate size of remaining data */
    max_size = aiff->data_end - avio_tell(s->pb);
    if (max_size <= 0)
        return AVERROR_EOF;

    /* Now for that packet */
    switch (st->codec->codec_id) {
    case AV_CODEC_ID_ADPCM_IMA_QT:
    case AV_CODEC_ID_GSM:
    case AV_CODEC_ID_QDM2:
    case AV_CODEC_ID_QCELP:
        size = st->codec->block_align;
        break;
    default:
        size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
    }
    size = FFMIN(max_size, size);
    res = av_get_packet(s->pb, pkt, size);
    if (res < 0)
        return res;

    if (size >= st->codec->block_align)
        pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
    /* Only one stream in an AIFF file */
    pkt->stream_index = 0;
    pkt->duration     = (res / st->codec->block_align) * aiff->block_duration;
    return 0;
}

AVInputFormat ff_aiff_demuxer = {
    .name           = "aiff",
    .long_name      = NULL_IF_CONFIG_SMALL("Audio IFF"),
    .priv_data_size = sizeof(AIFFInputContext),
    .read_probe     = aiff_probe,
    .read_header    = aiff_read_header,
    .read_packet    = aiff_read_packet,
    .read_seek      = ff_pcm_read_seek,
    .codec_tag      = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },
};
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* AIFF/AIFF-C demuxer
	3	* Copyright (c) 2006 Patrick Guimond
	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	#include "libavutil/intreadwrite.h"
	23	#include "libavutil/mathematics.h"
	24	#include "libavutil/dict.h"
	25	#include "avformat.h"
	26	#include "internal.h"
	27	#include "pcm.h"
	28	#include "aiff.h"
	29	#include "isom.h"
	30	#include "id3v2.h"
	31	#include "mov_chan.h"
	32
	33	#define AIFF 0
	34	#define AIFF_C_VERSION1 0xA2805140
	35
	36	typedef struct {
	37	int64_t data_end;
	38	int block_duration;
	39	} AIFFInputContext;
	40
	41	static enum AVCodecID aiff_codec_get_id(int bps)
	42	{
	43	if (bps <= 8)
	44	return AV_CODEC_ID_PCM_S8;
	45	if (bps <= 16)
	46	return AV_CODEC_ID_PCM_S16BE;
	47	if (bps <= 24)
	48	return AV_CODEC_ID_PCM_S24BE;
	49	if (bps <= 32)
	50	return AV_CODEC_ID_PCM_S32BE;
	51
	52	/* bigger than 32 isn't allowed */
	53	return AV_CODEC_ID_NONE;
	54	}
	55
	56	/* returns the size of the found tag */
	57	static int get_tag(AVIOContext pb, uint32_t tag)
	58	{
	59	int size;
	60
	61	if (avio_feof(pb))
	62	return AVERROR(EIO);
	63
	64	*tag = avio_rl32(pb);
65	size = avio_rb32(pb);
66
67	if (size < 0)
68	size = 0x7fffffff;
69
70	return size;
71	}
72
73	/* Metadata string read */
74	static void get_meta(AVFormatContext s, const char key, int size)
75	{
76	uint8_t *str = av_malloc(size+1);
77
78	if (str) {
79	int res = avio_read(s->pb, str, size);
80	if (res < 0){
81	av_free(str);
82	return;
83	}
84	size += (size&1)-res;
85	str[res] = 0;
86	av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
87	}else
88	size+= size&1;
89
90	avio_skip(s->pb, size);
91	}
92
93	/* Returns the number of sound data frames or negative on error */
94	static unsigned int get_aiff_header(AVFormatContext *s, int size,
95	unsigned version)
96	{
97	AVIOContext *pb = s->pb;
98	AVCodecContext *codec = s->streams[0]->codec;
99	AIFFInputContext *aiff = s->priv_data;
100	int exp;
101	uint64_t val;
102	double sample_rate;
103	unsigned int num_frames;
104
105	if (size & 1)
106	size++;
107	codec->codec_type = AVMEDIA_TYPE_AUDIO;
108	codec->channels = avio_rb16(pb);
109	num_frames = avio_rb32(pb);
110	codec->bits_per_coded_sample = avio_rb16(pb);
111
112	exp = avio_rb16(pb);
113	val = avio_rb64(pb);
114	sample_rate = ldexp(val, exp - 16383 - 63);
115	codec->sample_rate = sample_rate;
116	size -= 18;
117
118	/* get codec id for AIFF-C */
119	if (version == AIFF_C_VERSION1) {
120	codec->codec_tag = avio_rl32(pb);
121	codec->codec_id = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
122	size -= 4;
123	}
124
125	if (version != AIFF_C_VERSION1 \|\| codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
126	codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
127	codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
128	aiff->block_duration = 1;
129	} else {
130	switch (codec->codec_id) {
131	case AV_CODEC_ID_PCM_F32BE:
132	case AV_CODEC_ID_PCM_F64BE:
133	case AV_CODEC_ID_PCM_S16LE:
134	case AV_CODEC_ID_PCM_ALAW:
135	case AV_CODEC_ID_PCM_MULAW:
136	aiff->block_duration = 1;
137	break;
138	case AV_CODEC_ID_ADPCM_IMA_QT:
139	codec->block_align = 34*codec->channels;
140	break;
141	case AV_CODEC_ID_MACE3:
142	codec->block_align = 2*codec->channels;
143	break;
144	case AV_CODEC_ID_ADPCM_G726LE:
145	codec->bits_per_coded_sample = 5;
146	case AV_CODEC_ID_ADPCM_G722:
147	case AV_CODEC_ID_MACE6:
148	codec->block_align = 1*codec->channels;
149	break;
150	case AV_CODEC_ID_GSM:
151	codec->block_align = 33;
152	break;
153	default:
154	aiff->block_duration = 1;
155	break;
156	}
157	if (codec->block_align > 0)
158	aiff->block_duration = av_get_audio_frame_duration(codec,
159	codec->block_align);
160	}
161
162	/* Block align needs to be computed in all cases, as the definition
163	* is specific to applications -> here we use the WAVE format definition */
164	if (!codec->block_align)
165	codec->block_align = (av_get_bits_per_sample(codec->codec_id) * codec->channels) >> 3;
166
167	if (aiff->block_duration) {
168	codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
169	aiff->block_duration;
170	}
171
172	/* Chunk is over */
173	if (size)
174	avio_skip(pb, size);
175
176	return num_frames;
177	}
178
179	static int aiff_probe(AVProbeData *p)
180	{
181	/* check file header */
182	if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
183	p->buf[2] == 'R' && p->buf[3] == 'M' &&
184	p->buf[8] == 'A' && p->buf[9] == 'I' &&
185	p->buf[10] == 'F' && (p->buf[11] == 'F' \|\| p->buf[11] == 'C'))
186	return AVPROBE_SCORE_MAX;
187	else
188	return 0;
189	}
190
191	/* aiff input */
192	static int aiff_read_header(AVFormatContext *s)
193	{
194	int ret, size, filesize;
195	int64_t offset = 0, position;
196	uint32_t tag;
197	unsigned version = AIFF_C_VERSION1;
198	AVIOContext *pb = s->pb;
199	AVStream * st;
200	AIFFInputContext *aiff = s->priv_data;
201	ID3v2ExtraMeta *id3v2_extra_meta = NULL;
202
203	/* check FORM header */
204	filesize = get_tag(pb, &tag);
205	if (filesize < 0 \|\| tag != MKTAG('F', 'O', 'R', 'M'))
206	return AVERROR_INVALIDDATA;
207
208	/* AIFF data type */
209	tag = avio_rl32(pb);
210	if (tag == MKTAG('A', 'I', 'F', 'F')) /* Got an AIFF file */
211	version = AIFF;
212	else if (tag != MKTAG('A', 'I', 'F', 'C')) /* An AIFF-C file then */
213	return AVERROR_INVALIDDATA;
214
215	filesize -= 4;
216
217	st = avformat_new_stream(s, NULL);
218	if (!st)
219	return AVERROR(ENOMEM);
220
221	while (filesize > 0) {
222	/* parse different chunks */
223	size = get_tag(pb, &tag);
224	if (size < 0)
225	return size;
226
227	filesize -= size + 8;
228
229	switch (tag) {
230	case MKTAG('C', 'O', 'M', 'M'): /* Common chunk */
231	/* Then for the complete header info */
232	st->nb_frames = get_aiff_header(s, size, version);
233	if (st->nb_frames < 0)
234	return st->nb_frames;
235	if (offset > 0) // COMM is after SSND
236	goto got_sound;
237	break;
238	case MKTAG('I', 'D', '3', ' '):
239	position = avio_tell(pb);
240	ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
241	if (id3v2_extra_meta)
242	if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {
243	ff_id3v2_free_extra_meta(&id3v2_extra_meta);
244	return ret;
245	}
246	ff_id3v2_free_extra_meta(&id3v2_extra_meta);
247	if (position + size > avio_tell(pb))
248	avio_skip(pb, position + size - avio_tell(pb));
249	break;
250	case MKTAG('F', 'V', 'E', 'R'): /* Version chunk */
251	version = avio_rb32(pb);
252	break;
253	case MKTAG('N', 'A', 'M', 'E'): /* Sample name chunk */
254	get_meta(s, "title" , size);
255	break;
256	case MKTAG('A', 'U', 'T', 'H'): /* Author chunk */
257	get_meta(s, "author" , size);
258	break;
259	case MKTAG('(', 'c', ')', ' '): /* Copyright chunk */
260	get_meta(s, "copyright", size);
261	break;
262	case MKTAG('A', 'N', 'N', 'O'): /* Annotation chunk */
263	get_meta(s, "comment" , size);
264	break;
265	case MKTAG('S', 'S', 'N', 'D'): /* Sampled sound chunk */
266	aiff->data_end = avio_tell(pb) + size;
267	offset = avio_rb32(pb); /* Offset of sound data */
268	avio_rb32(pb); /* BlockSize... don't care */
269	offset += avio_tell(pb); /* Compute absolute data offset */
270	if (st->codec->block_align && !pb->seekable) /* Assume COMM already parsed */
271	goto got_sound;
272	if (!pb->seekable) {
273	av_log(s, AV_LOG_ERROR, "file is not seekable\n");
274	return -1;
275	}
276	avio_skip(pb, size - 8);
277	break;
278	case MKTAG('w', 'a', 'v', 'e'):
279	if ((uint64_t)size > (1<<30))
280	return -1;
281	if (ff_get_extradata(st->codec, pb, size) < 0)
282	return AVERROR(ENOMEM);
283	if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align) {
284	st->codec->block_align = AV_RB32(st->codec->extradata+11*4);
285	aiff->block_duration = AV_RB32(st->codec->extradata+9*4);
286	} else if (st->codec->codec_id == AV_CODEC_ID_QCELP) {
287	char rate = 0;
288	if (size >= 25)
289	rate = st->codec->extradata[24];
290	switch (rate) {
291	case 'H': // RATE_HALF
292	st->codec->block_align = 17;
293	break;
294	case 'F': // RATE_FULL
295	default:
296	st->codec->block_align = 35;
297	}
298	aiff->block_duration = 160;
299	st->codec->bit_rate = st->codec->sample_rate * (st->codec->block_align << 3) /
300	aiff->block_duration;
301	}
302	break;
303	case MKTAG('C','H','A','N'):
304	if(ff_mov_read_chan(s, pb, st, size) < 0)
305	return AVERROR_INVALIDDATA;
306	break;
307	default: /* Jump */
308	if (size & 1) /* Always even aligned */
309	size++;
310	avio_skip(pb, size);
311	}
312	}
313
314	got_sound:
315	if (!st->codec->block_align) {
316	av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
317	return -1;
318	}
319
320	/* Now positioned, get the sound data start and end */
321	avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
322	st->start_time = 0;
323	st->duration = st->nb_frames * aiff->block_duration;
324
325	/* Position the stream at the first block */
326	avio_seek(pb, offset, SEEK_SET);
327
328	return 0;
329	}
330
331	#define MAX_SIZE 4096
332
333	static int aiff_read_packet(AVFormatContext *s,
334	AVPacket *pkt)
335	{
336	AVStream *st = s->streams[0];
337	AIFFInputContext *aiff = s->priv_data;
338	int64_t max_size;
339	int res, size;
340
341	/* calculate size of remaining data */
342	max_size = aiff->data_end - avio_tell(s->pb);
343	if (max_size <= 0)
344	return AVERROR_EOF;
345
346	/* Now for that packet */
347	switch (st->codec->codec_id) {
348	case AV_CODEC_ID_ADPCM_IMA_QT:
349	case AV_CODEC_ID_GSM:
350	case AV_CODEC_ID_QDM2:
351	case AV_CODEC_ID_QCELP:
352	size = st->codec->block_align;
353	break;
354	default:
355	size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
356	}
357	size = FFMIN(max_size, size);
358	res = av_get_packet(s->pb, pkt, size);
359	if (res < 0)
360	return res;
361
362	if (size >= st->codec->block_align)
363	pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
364	/* Only one stream in an AIFF file */
365	pkt->stream_index = 0;
366	pkt->duration = (res / st->codec->block_align) * aiff->block_duration;
367	return 0;
368	}
369
370	AVInputFormat ff_aiff_demuxer = {
371	.name = "aiff",
372	.long_name = NULL_IF_CONFIG_SMALL("Audio IFF"),
373	.priv_data_size = sizeof(AIFFInputContext),
374	.read_probe = aiff_probe,
375	.read_header = aiff_read_header,
376	.read_packet = aiff_read_packet,
377	.read_seek = ff_pcm_read_seek,
378	.codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },
379	};