/* 
 * Copyright (C) 2013 nu774
 * For conditions of distribution and use, see copyright notice in COPYING
 */
#if HAVE_CONFIG_H
#  include "config.h"
#endif
#if HAVE_STDINT_H
#  include <stdint.h>
#endif
#if HAVE_INTTYPES_H
#  include <inttypes.h>
#elif defined(_MSC_VER)
#  define SCNd64 "I64d"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <locale.h>
#include <errno.h>
#include <sys/stat.h>
#include <getopt.h>
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef _WIN32
#include <io.h>
#endif
#include "compat.h"
#include "wav_reader.h"
#include "aacenc.h"
#include "m4af.h"
#include "progress.h"
#include "version.h"

#define PROGNAME "fdkaac"

static
int read_callback(void *cookie, void *data, uint32_t size)
{
    size_t rc = fread(data, 1, size, (FILE*)cookie);
    return ferror((FILE*)cookie) ? -1 : (int)rc;
}

static
int write_callback(void *cookie, const void *data, uint32_t size)
{
    size_t rc = fwrite(data, 1, size, (FILE*)cookie);
    return ferror((FILE*)cookie) ? -1 : (int)rc;
}

static
int seek_callback(void *cookie, int64_t off, int whence)
{
    return fseeko((FILE*)cookie, off, whence);
}

static
int64_t tell_callback(void *cookie)
{
    return ftello((FILE*)cookie);
}

static
void usage(void)
{
    printf(
PROGNAME " %s\n"
"Usage: " PROGNAME " [options] input_file\n"
"Options:\n"
" -h, --help                    Print this help message\n"
" -p, --profile <n>             Profile (audio object type)\n"
"                                 2: MPEG-4 AAC LC (default)\n"
"                                 5: MPEG-4 HE-AAC (SBR)\n"
"                                29: MPEG-4 HE-AAC v2 (SBR+PS)\n"
"                                23: MPEG-4 AAC LD\n"
"                                39: MPEG-4 AAC ELD\n"
"                               129: MPEG-2 AAC LC\n"
"                               132: MPEG-2 HE-AAC (SBR)\n"
"                               156: MPEG-2 HE-AAC v2 (SBR+PS)\n"
" -b, --bitrate <n>             Bitrate in bits per seconds (for CBR)\n"
" -m, --bitrate-mode <n>        Bitrate configuration\n"
"                                 0: CBR (default)\n"
"                                 1-5: VBR\n"
"                               (VBR mode is not officially supported, and\n"
"                                works only on a certain combination of\n"
"                                parameter settings, sample rate, and\n"
"                                channel configuration)\n"
" -w, --bandwidth <n>           Frequency bandwidth in Hz (AAC LC only)\n"
" -a, --afterburner <n>         Afterburner\n"
"                                 0: Off\n"
"                                 1: On(default)\n"
" -L, --lowdelay-sbr            Enable ELD-SBR (AAC ELD only)\n"
" -s, --sbr-signaling <n>       SBR signaling mode\n"
"                                 0: Implicit, backward compatible(default)\n"
"                                 1: Explicit SBR and implicit PS\n"
"                                 2: Explicit hierarchical signaling\n"
" -f, --transport-format <n>    Transport format\n"
"                                 0: RAW (default, muxed into M4A)\n"
"                                 1: ADIF\n"
"                                 2: ADTS\n"
"                                 6: LATM MCP=1\n"
"                                 7: LATM MCP=0\n"
"                                10: LOAS/LATM (LATM within LOAS)\n"
" -C, --adts-crc-check          Add CRC protection on ADTS header\n"
" -h, --header-period <n>       StreamMuxConfig/PCE repetition period in\n"
"                               transport layer\n"
"\n"
" -o <filename>                 Output filename\n"
" --ignore-length               Ignore length of WAV header\n"
"\n"
"Options for raw (headerless) input:\n"
" -R, --raw                     Treat input as raw (by default WAV is\n"
"                               assumed)\n"
" --raw-channels <n>            Number of channels (default: 2)\n"
" --raw-rate     <n>            Sample rate (default: 44100)\n"
" --raw-format   <spec>         Sample format, default is \"S16L\".\n"
"                               Spec is as follows:\n"
"                                1st char: S(igned)|U(nsigned)|F(loat)\n"
"                                2nd part: bits per channel\n"
"                                Last char: L(ittle)|B(ig)\n"
"                               Last char can be omitted, in which case L is\n"
"                               assumed. Spec is case insensitive, therefore\n"
"                               \"u16b\" is same as \"U16B\".\n"
"\n"
"Tagging options:\n"
" --title <string>\n"
" --artist <string>\n"
" --album <string>\n"
" --genre <string>\n"
" --date <string>\n"
" --composer <string>\n"
" --grouping <string>\n"
" --comment <string>\n"
" --album-artist <string>\n"
" --track <number[/total]>\n"
" --disk <number[/total]>\n"
" --tempo <n>\n"
" --tag <fcc>:<value>          Set iTunes predefined tag with four char code.\n"
" --long-tag <name>:<value>    Set arbitrary tag as iTunes custom metadata.\n"
    , fdkaac_version);
}

typedef struct aacenc_tag_entry_t {
    uint32_t tag;
    const char *name;
    const char *data;
    uint32_t data_size;
} aacenc_tag_entry_t;

typedef struct aacenc_param_ex_t {
    AACENC_PARAMS

    char *input_filename;
    char *output_filename;
    unsigned ignore_length;

    int is_raw;
    unsigned raw_channels;
    unsigned raw_rate;
    const char *raw_format;

    aacenc_tag_entry_t *tag_table;
    unsigned tag_count;
    unsigned tag_table_capacity;
} aacenc_param_ex_t;

static
void param_add_itmf_entry(aacenc_param_ex_t *params, uint32_t tag,
                         const char *key, const char *value, uint32_t size)
{
    aacenc_tag_entry_t *entry;
    if (params->tag_count == params->tag_table_capacity) {
        unsigned newsize = params->tag_table_capacity;
        newsize = newsize ? newsize * 2 : 1;
        params->tag_table =
            realloc(params->tag_table, newsize * sizeof(aacenc_tag_entry_t));
        params->tag_table_capacity = newsize;
    }
    entry = params->tag_table + params->tag_count;
    entry->tag = tag;
    if (tag == M4AF_FOURCC('-','-','-','-'))
        entry->name = key;
    entry->data = value;
    entry->data_size = size;
    params->tag_count++;
}

static
int parse_options(int argc, char **argv, aacenc_param_ex_t *params)
{
    int ch;
    unsigned n;

#define OPT_RAW_CHANNELS M4AF_FOURCC('r','c','h','n')
#define OPT_RAW_RATE     M4AF_FOURCC('r','r','a','t')
#define OPT_RAW_FORMAT   M4AF_FOURCC('r','f','m','t')
#define OPT_SHORT_TAG    M4AF_FOURCC('s','t','a','g')
#define OPT_LONG_TAG     M4AF_FOURCC('l','t','a','g')

    static struct option long_options[] = {
        { "help",             no_argument,       0, 'h' },
        { "profile",          required_argument, 0, 'p' },
        { "bitrate",          required_argument, 0, 'b' },
        { "bitrate-mode",     required_argument, 0, 'm' },
        { "bandwidth",        required_argument, 0, 'w' },
        { "afterburner",      required_argument, 0, 'a' },
        { "lowdelay-sbr",     no_argument,       0, 'L' },
        { "sbr-signaling",    required_argument, 0, 's' },
        { "transport-format", required_argument, 0, 'f' },
        { "adts-crc-check",   no_argument,       0, 'C' },
        { "header-period",    required_argument, 0, 'P' },

        { "ignore-length",    no_argument,       0, 'I' },

        { "raw",              no_argument,       0, 'R' },
        { "raw-channels",     required_argument, 0, OPT_RAW_CHANNELS       },
        { "raw-rate",         required_argument, 0, OPT_RAW_RATE           },
        { "raw-format",       required_argument, 0, OPT_RAW_FORMAT         },

        { "title",            required_argument, 0, M4AF_TAG_TITLE         },
        { "artist",           required_argument, 0, M4AF_TAG_ARTIST        },
        { "album",            required_argument, 0, M4AF_TAG_ALBUM         },
        { "genre",            required_argument, 0, M4AF_TAG_GENRE         },
        { "date",             required_argument, 0, M4AF_TAG_DATE          },
        { "composer",         required_argument, 0, M4AF_TAG_COMPOSER      },
        { "grouping",         required_argument, 0, M4AF_TAG_GROUPING      },
        { "comment",          required_argument, 0, M4AF_TAG_COMMENT       },
        { "album-artist",     required_argument, 0, M4AF_TAG_ALBUM_ARTIST  },
        { "track",            required_argument, 0, M4AF_TAG_TRACK         },
        { "disk",             required_argument, 0, M4AF_TAG_DISK          },
        { "tempo",            required_argument, 0, M4AF_TAG_TEMPO         },
        { "tag",              required_argument, 0, OPT_SHORT_TAG          },
        { "long-tag",         required_argument, 0, OPT_LONG_TAG           },
    };
    params->afterburner = 1;

    aacenc_getmainargs(&argc, &argv);
    while ((ch = getopt_long(argc, argv, "hp:b:m:w:a:Ls:f:CP:Io:R",
                             long_options, 0)) != EOF) {
        switch (ch) {
        case 'h':
            return usage(), -1;
        case 'p':
            if (sscanf(optarg, "%u", &n) != 1) {
                fprintf(stderr, "invalid arg for profile\n");
                return -1;
            }
            params->profile = n;
            break;
        case 'b':
            if (sscanf(optarg, "%u", &n) != 1) {
                fprintf(stderr, "invalid arg for bitrate\n");
                return -1;
            }
            params->bitrate = n;
            break;
        case 'm':
            if (sscanf(optarg, "%u", &n) != 1 || n > 5) {
                fprintf(stderr, "invalid arg for bitrate-mode\n");
                return -1;
            }
            params->bitrate_mode = n;
            break;
        case 'w':
            if (sscanf(optarg, "%u", &n) != 1) {
                fprintf(stderr, "invalid arg for bandwidth\n");
                return -1;
            }
            params->bandwidth = n;
            break;
        case 'a':
            if (sscanf(optarg, "%u", &n) != 1 || n > 1) {
                fprintf(stderr, "invalid arg for afterburner\n");
                return -1;
            }
            params->afterburner = n;
            break;
        case 'L':
            params->lowdelay_sbr = 1;
            break;
        case 's':
            if (sscanf(optarg, "%u", &n) != 1 || n > 2) {
                fprintf(stderr, "invalid arg for sbr-signaling\n");
                return -1;
            }
            params->sbr_signaling = n;
            break;
        case 'f':
            if (sscanf(optarg, "%u", &n) != 1) {
                fprintf(stderr, "invalid arg for transport-format\n");
                return -1;
            }
            params->transport_format = n;
            break;
        case 'c':
            params->adts_crc_check = 1;
            break;
        case 'P':
            if (sscanf(optarg, "%u", &n) != 1) {
                fprintf(stderr, "invalid arg for header-period\n");
                return -1;
            }
            params->header_period = n;
            break;
        case 'o':
            params->output_filename = optarg;
            break;
        case 'I':
            params->ignore_length = 1;
            break;
        case 'R':
            params->is_raw = 1;
            break;
        case OPT_RAW_CHANNELS:
            if (sscanf(optarg, "%u", &n) != 1) {
                fprintf(stderr, "invalid arg for raw-channels\n");
                return -1;
            }
            params->raw_channels = n;
            break;
        case OPT_RAW_RATE:
            if (sscanf(optarg, "%u", &n) != 1) {
                fprintf(stderr, "invalid arg for raw-rate\n");
                return -1;
            }
            params->raw_rate = n;
            break;
        case OPT_RAW_FORMAT:
            params->raw_format = optarg;
            break;
        case M4AF_TAG_TITLE:
        case M4AF_TAG_ARTIST:
        case M4AF_TAG_ALBUM:
        case M4AF_TAG_GENRE:
        case M4AF_TAG_DATE:
        case M4AF_TAG_COMPOSER:
        case M4AF_TAG_GROUPING:
        case M4AF_TAG_COMMENT:
        case M4AF_TAG_ALBUM_ARTIST:
        case M4AF_TAG_TRACK:
        case M4AF_TAG_DISK:
        case M4AF_TAG_TEMPO:
            param_add_itmf_entry(params, ch, 0, optarg, strlen(optarg));
            break;
        case OPT_SHORT_TAG:
        case OPT_LONG_TAG:
            {
                char *val;
                size_t klen;
                unsigned fcc = M4AF_FOURCC('-','-','-','-');

                if ((val = strchr(optarg, ':')) == 0) {
                    fprintf(stderr, "invalid arg for tag\n");
                    return -1;
                }
                *val++ = '\0';
                if (ch == OPT_SHORT_TAG) {
                    /*
                     * take care of U+00A9(COPYRIGHT SIGN).
                     * 1) if length of fcc is 3, we prepend '\xa9'.
                     * 2) U+00A9 becomes "\xc2\xa9" in UTF-8. Therefore
                     *    we remove first '\xc2'.
                     */
                    if (optarg[0] == '\xc2')
                        ++optarg;
                    if ((klen = strlen(optarg))== 3)
                        fcc = 0xa9;
                    else if (klen != 4) {
                        fprintf(stderr, "invalid arg for tag\n");
                        return -1;
                    }
                    for (; *optarg; ++optarg)
                        fcc = ((fcc << 8) | (*optarg & 0xff));
                }
                param_add_itmf_entry(params, fcc, optarg, val, strlen(val));
            }
            break;
        default:
            return usage(), -1;
        }
    }
    if (argc == optind)
        return usage(), -1;

    if (!params->bitrate && !params->bitrate_mode) {
        fprintf(stderr, "bitrate or bitrate-mode is mandatory\n");
        return -1;
    }
    if (params->output_filename && !strcmp(params->output_filename, "-") &&
        !params->transport_format) {
        fprintf(stderr, "stdout streaming is not available on M4A output\n");
        return -1;
    }
    if (params->bitrate && params->bitrate < 10000)
        params->bitrate *= 1000;

    if (params->is_raw) {
        if (!params->raw_channels)
            params->raw_channels = 2;
        if (!params->raw_rate)
            params->raw_rate = 44100;
        if (!params->raw_format)
            params->raw_format = "S16L";
    }
    params->input_filename = argv[optind];
    return 0;
};

static
int write_sample(FILE *ofp, m4af_writer_t *m4af,
                 const void *data, uint32_t size, uint32_t duration)
{
    if (!m4af) {
        fwrite(data, 1, size, ofp);
        if (ferror(ofp)) {
            fprintf(stderr, "ERROR: fwrite(): %s\n", strerror(errno));
            return -1;
        }
    } else if (m4af_write_sample(m4af, 0, data, size, duration) < 0) {
        fprintf(stderr, "ERROR: failed to write m4a sample\n");
        return -1;
    }
    return 0;
}

static
int encode(wav_reader_t *wavf, HANDLE_AACENCODER encoder,
           uint32_t frame_length, FILE *ofp, m4af_writer_t *m4af)
{
    uint8_t *ibuf = 0;
    int16_t *pcmbuf = 0;
    uint32_t pcmsize = 0;
    uint8_t *obuf = 0;
    uint32_t olen;
    uint32_t osize = 0;
    int nread = 1;
    int consumed;
    int rc = -1;
    int frames_written = 0;
    aacenc_progress_t progress = { 0 };
    const pcm_sample_description_t *format = wav_get_format(wavf);

    ibuf = malloc(frame_length * format->bytes_per_frame);
    aacenc_progress_init(&progress, wav_get_length(wavf), format->sample_rate);
    do {
        if (nread) {
            if ((nread = wav_read_frames(wavf, ibuf, frame_length)) < 0) {
                fprintf(stderr, "ERROR: read failed\n");
                goto END;
            } else if (nread > 0) {
                if (pcm_convert_to_native_sint16(format, ibuf, nread,
                                                 &pcmbuf, &pcmsize) < 0) {
                    fprintf(stderr, "ERROR: unsupported sample format\n");
                    goto END;
                }
            }
            aacenc_progress_update(&progress, wav_get_position(wavf),
                                   format->sample_rate * 2);
        }
        if ((consumed = aac_encode_frame(encoder, format, pcmbuf, nread,
                                         &obuf, &olen, &osize)) < 0)
            goto END;
        if (olen > 0) {
            if (write_sample(ofp, m4af, obuf, olen, frame_length) < 0)
                goto END;
            ++frames_written;
        }
    } while (nread > 0 || olen > 0);
    aacenc_progress_finish(&progress, wav_get_position(wavf));
    rc = frames_written;
END:
    if (ibuf) free(ibuf);
    if (pcmbuf) free(pcmbuf);
    if (obuf) free(obuf);
    return rc;
}

static
void put_tag_entry(m4af_writer_t *m4af, const aacenc_tag_entry_t *tag)
{
    unsigned m, n = 0;

    switch (tag->tag) {
    case M4AF_TAG_TRACK:
        if (sscanf(tag->data, "%u/%u", &m, &n) >= 1)
            m4af_add_itmf_track_tag(m4af, m, n);
        break;
    case M4AF_TAG_DISK:
        if (sscanf(tag->data, "%u/%u", &m, &n) >= 1)
            m4af_add_itmf_disk_tag(m4af, m, n);
        break;
    case M4AF_TAG_GENRE_ID3:
        if (sscanf(tag->data, "%u", &n) == 1)
            m4af_add_itmf_genre_tag(m4af, n);
        break;
    case M4AF_TAG_TEMPO:
        if (sscanf(tag->data, "%u", &n) == 1)
            m4af_add_itmf_int16_tag(m4af, tag->tag, n);
        break;
    case M4AF_TAG_COMPILATION:
    case M4AF_FOURCC('a','k','I','D'):
    case M4AF_FOURCC('h','d','v','d'):
    case M4AF_FOURCC('p','c','s','t'):
    case M4AF_FOURCC('p','g','a','p'):
    case M4AF_FOURCC('r','t','n','g'):
    case M4AF_FOURCC('s','t','i','k'):
        if (sscanf(tag->data, "%u", &n) == 1)
            m4af_add_itmf_int8_tag(m4af, tag->tag, n);
        break;
    case M4AF_FOURCC('a','t','I','D'):
    case M4AF_FOURCC('c','m','I','D'):
    case M4AF_FOURCC('c','n','I','D'):
    case M4AF_FOURCC('g','e','I','D'):
    case M4AF_FOURCC('s','f','I','D'):
    case M4AF_FOURCC('t','v','s','n'):
    case M4AF_FOURCC('t','v','s','s'):
        if (sscanf(tag->data, "%u", &n) == 1)
            m4af_add_itmf_int32_tag(m4af, tag->tag, n);
        break;
    case M4AF_FOURCC('p','l','I','D'):
        {
            int64_t qn;
            if (sscanf(tag->data, "%" SCNd64, &qn) == 1)
                m4af_add_itmf_int64_tag(m4af, tag->tag, qn);
            break;
        }
    case M4AF_TAG_ARTWORK:
        {
            int data_type = 0;
            if (!memcmp(tag->data, "GIF", 3))
                data_type = M4AF_GIF;
            else if (!memcmp(tag->data, "\xff\xd8\xff", 3))
                data_type = M4AF_JPEG;
            else if (!memcmp(tag->data, "\x89PNG", 4))
                data_type = M4AF_PNG;
            if (data_type)
                m4af_add_itmf_short_tag(m4af, tag->tag, data_type,
                                        tag->data, tag->data_size);
            break;
        }
    case M4AF_FOURCC('-','-','-','-'):
        {
            char *u8 = aacenc_to_utf8(tag->data);
            m4af_add_itmf_long_tag(m4af, tag->name, u8);
            free(u8);
            break;
        }
    case M4AF_TAG_TITLE:
    case M4AF_TAG_ARTIST:
    case M4AF_TAG_ALBUM:
    case M4AF_TAG_GENRE:
    case M4AF_TAG_DATE:
    case M4AF_TAG_COMPOSER:
    case M4AF_TAG_GROUPING:
    case M4AF_TAG_COMMENT:
    case M4AF_TAG_LYRICS:
    case M4AF_TAG_TOOL:
    case M4AF_TAG_ALBUM_ARTIST:
    case M4AF_TAG_DESCRIPTION:
    case M4AF_TAG_LONG_DESCRIPTION:
    case M4AF_TAG_COPYRIGHT:
    case M4AF_FOURCC('a','p','I','D'):
    case M4AF_FOURCC('c','a','t','g'):
    case M4AF_FOURCC('k','e','y','w'):
    case M4AF_FOURCC('p','u','r','d'):
    case M4AF_FOURCC('p','u','r','l'):
    case M4AF_FOURCC('s','o','a','a'):
    case M4AF_FOURCC('s','o','a','l'):
    case M4AF_FOURCC('s','o','a','r'):
    case M4AF_FOURCC('s','o','c','o'):
    case M4AF_FOURCC('s','o','n','m'):
    case M4AF_FOURCC('s','o','s','n'):
    case M4AF_FOURCC('t','v','e','n'):
    case M4AF_FOURCC('t','v','n','n'):
    case M4AF_FOURCC('t','v','s','h'):
    case M4AF_FOURCC('x','i','d',' '):
    case M4AF_FOURCC('\xa9','e','n','c'):
    case M4AF_FOURCC('\xa9','s','t','3'):
        {
            char *u8 = aacenc_to_utf8(tag->data);
            m4af_add_itmf_string_tag(m4af, tag->tag, u8);
            free(u8);
            break;
        }
    default:
        fprintf(stderr, "WARNING: unknown/unsupported tag: %c%c%c%c\n",
                tag->tag >> 24, (tag->tag >> 16) & 0xff,
                (tag->tag >> 8) & 0xff, tag->tag & 0xff);
    }
}

static
void put_tool_tag(m4af_writer_t *m4af, const aacenc_param_ex_t *params,
                  HANDLE_AACENCODER encoder)
{
    char tool_info[256];
    char *p = tool_info;
    LIB_INFO *lib_info = 0;

    p += sprintf(p, PROGNAME " %s, ", fdkaac_version);

    lib_info = calloc(FDK_MODULE_LAST, sizeof(LIB_INFO));
    if (aacEncGetLibInfo(lib_info) == AACENC_OK) {
        int i;
        for (i = 0; i < FDK_MODULE_LAST; ++i)
            if (lib_info[i].module_id == FDK_AACENC)
                break;
        p += sprintf(p, "libfdk-aac %s, ", lib_info[i].versionStr);
    }
    free(lib_info);
    if (params->bitrate_mode)
        sprintf(p, "VBR mode %d", params->bitrate_mode);
    else
        sprintf(p, "CBR %dkbps",
                aacEncoder_GetParam(encoder, AACENC_BITRATE) / 1000);

    m4af_add_itmf_string_tag(m4af, M4AF_TAG_TOOL, tool_info);
}

static
int finalize_m4a(m4af_writer_t *m4af, const aacenc_param_ex_t *params,
                 HANDLE_AACENCODER encoder)
{
    unsigned i;
    aacenc_tag_entry_t *tag = params->tag_table;
    for (i = 0; i < params->tag_count; ++i, ++tag)
        put_tag_entry(m4af, tag);

    put_tool_tag(m4af, params, encoder);

    if (m4af_finalize(m4af) < 0) {
        fprintf(stderr, "ERROR: failed to finalize m4a\n");
        return -1;
    }
    return 0;
}

static
char *generate_output_filename(const char *filename, const char *ext)
{
    char *p = 0;
    size_t ext_len = strlen(ext);

    if (strcmp(filename, "-") == 0) {
        p = malloc(ext_len + 6);
        sprintf(p, "stdin%s", ext);
    } else {
        const char *base = aacenc_basename(filename);
        size_t ilen = strlen(base);
        const char *ext_org = strrchr(base, '.');
        if (ext_org) ilen = ext_org - base;
        p = malloc(ilen + ext_len + 1);
        sprintf(p, "%.*s%s", ilen, base, ext);
    }
    return p;
}

static
int parse_raw_spec(const char *spec, pcm_sample_description_t *desc)
{
    unsigned bits;
    unsigned char c_type, c_endian = 'L';
    int type;

    if (sscanf(spec, "%c%u%c", &c_type, &bits, &c_endian) < 2)
        return -1;
    c_type = toupper(c_type);
    c_endian = toupper(c_endian);

    if (c_type == 'S')
        type = 1;
    else if (c_type == 'U')
        type = 2;
    else if (c_type == 'F')
        type = 4;
    else
        return -1;

    if (c_endian == 'B')
        type |= 8;
    else if (c_endian != 'L')
        return -1;

    if (c_type == 'F' && bits != 32 && bits != 64)
        return -1;
    if (c_type != 'F' && (bits < 8 || bits > 32))
        return -1;

    desc->sample_type = type;
    desc->bits_per_channel = bits;
    return 0;
}

int main(int argc, char **argv)
{
    wav_io_context_t wav_io = { read_callback, seek_callback, tell_callback };
    m4af_io_callbacks_t m4af_io = {
        write_callback, seek_callback, tell_callback };
    aacenc_param_ex_t params = { 0 };

    int result = 2;
    FILE *ifp = 0;
    FILE *ofp = 0;
    char *output_filename = 0;
    wav_reader_t *wavf = 0;
    HANDLE_AACENCODER encoder = 0;
    AACENC_InfoStruct aacinfo = { 0 };
    m4af_writer_t *m4af = 0;
    const pcm_sample_description_t *sample_format;
    int downsampled_timescale = 0;
    int frame_count = 0;
    struct stat stb = { 0 };

    setlocale(LC_CTYPE, "");
    setbuf(stderr, 0);

    if (parse_options(argc, argv, &params) < 0)
        return 1;

    if ((ifp = aacenc_fopen(params.input_filename, "rb")) == 0) {
        aacenc_fprintf(stderr, "ERROR: %s: %s\n", params.input_filename,
                       strerror(errno));
        goto END;
    }
    if (fstat(fileno(ifp), &stb) == 0 && (stb.st_mode & S_IFMT) != S_IFREG) {
        wav_io.seek = 0;
        wav_io.tell = 0;
    }
    if (!params.is_raw) {
        if ((wavf = wav_open(&wav_io, ifp, params.ignore_length)) == 0) {
            fprintf(stderr, "ERROR: broken / unsupported input file\n");
            goto END;
        }
    } else {
        int bytes_per_channel;
        pcm_sample_description_t desc = { 0 };
        if (parse_raw_spec(params.raw_format, &desc) < 0) {
            fprintf(stderr, "ERROR: invalid raw-format spec\n");
            goto END;
        }
        desc.sample_rate = params.raw_rate;
        desc.channels_per_frame = params.raw_channels;
        bytes_per_channel = (desc.bits_per_channel + 7) / 8;
        desc.bytes_per_frame = params.raw_channels * bytes_per_channel;
        if ((wavf = raw_open(&wav_io, ifp, &desc)) == 0) {
            fprintf(stderr, "ERROR: failed to open raw input\n");
            goto END;
        }
    }
    sample_format = wav_get_format(wavf);

    if (aacenc_init(&encoder, (aacenc_param_t*)&params, sample_format,
                    &aacinfo) < 0)
        goto END;

    if (!params.output_filename) {
        const char *ext = params.transport_format ? ".aac" : ".m4a";
        output_filename = generate_output_filename(params.input_filename, ext);
        params.output_filename = output_filename;
    }

    if ((ofp = aacenc_fopen(params.output_filename, "wb")) == 0) {
        aacenc_fprintf(stderr, "ERROR: %s: %s\n", params.output_filename,
                       strerror(errno));
        goto END;
    }
    if (!params.transport_format) {
        uint32_t scale;
        unsigned framelen = aacinfo.frameLength;
	int sbr_mode = aacenc_is_sbr_active((aacenc_param_t*)&params);
	int sig_mode = aacEncoder_GetParam(encoder, AACENC_SIGNALING_MODE);
	if (sbr_mode && !sig_mode)
	    downsampled_timescale = 1;
        scale = sample_format->sample_rate >> downsampled_timescale;
        if ((m4af = m4af_create(M4AF_CODEC_MP4A, scale, &m4af_io, ofp)) < 0)
            goto END;
        m4af_decoder_specific_info(m4af, 0, aacinfo.confBuf, aacinfo.confSize);
        m4af_set_fixed_frame_duration(m4af, 0,
                                      framelen >> downsampled_timescale);
        m4af_begin_write(m4af);
    }
    frame_count = encode(wavf, encoder, aacinfo.frameLength, ofp, m4af);
    if (frame_count < 0)
        goto END;
    if (m4af) {
        uint32_t delay = aacinfo.encoderDelay;
	int64_t frames_read = wav_get_position(wavf);
        uint32_t padding = frame_count * aacinfo.frameLength
                            - frames_read - aacinfo.encoderDelay;
        m4af_set_priming(m4af, 0, delay >> downsampled_timescale,
                         padding >> downsampled_timescale);
        if (finalize_m4a(m4af, &params, encoder) < 0)
            goto END;
    }
    result = 0;
END:
    if (wavf) wav_teardown(&wavf);
    if (ifp) fclose(ifp);
    if (m4af) m4af_teardown(&m4af);
    if (ofp) fclose(ofp);
    if (encoder) aacEncClose(&encoder);
    if (output_filename) free(output_filename);
    if (params.tag_table) free(params.tag_table);

    return result;
}