Esempio n. 1
0
static int a52_decode_end(AVCodecContext *avctx)
{
    AC3DecodeState *s = avctx->priv_data;
    s->a52_free(s->state);
#ifdef CONFIG_A52BIN
    dlclose(s->handle);
#endif
    return 0;
}
Esempio n. 2
0
static av_cold int a52_decode_init(AVCodecContext *avctx)
{
    AC3DecodeState *s = avctx->priv_data;

#ifdef CONFIG_LIBA52BIN
    s->handle = dlopen(liba52name, RTLD_LAZY);
    if (!s->handle)
    {
        av_log( avctx, AV_LOG_ERROR, "A52 library %s could not be opened! \n%s\n", liba52name, dlerror());
        return -1;
    }
    s->a52_init = (a52_state_t* (*)(uint32_t)) dlsymm(s->handle, "a52_init");
    s->a52_samples = (sample_t* (*)(a52_state_t*)) dlsymm(s->handle, "a52_samples");
    s->a52_syncinfo = (int (*)(uint8_t*, int*, int*, int*)) dlsymm(s->handle, "a52_syncinfo");
    s->a52_frame = (int (*)(a52_state_t*, uint8_t*, int*, sample_t*, sample_t)) dlsymm(s->handle, "a52_frame");
    s->a52_block = (int (*)(a52_state_t*)) dlsymm(s->handle, "a52_block");
    s->a52_free = (void (*)(a52_state_t*)) dlsymm(s->handle, "a52_free");
    if (!s->a52_init || !s->a52_samples || !s->a52_syncinfo
        || !s->a52_frame || !s->a52_block || !s->a52_free)
    {
        dlclose(s->handle);
        return -1;
    }
#else
    s->handle = 0;
    s->a52_init = a52_init;
    s->a52_samples = a52_samples;
    s->a52_syncinfo = a52_syncinfo;
    s->a52_frame = a52_frame;
    s->a52_block = a52_block;
    s->a52_free = a52_free;
#endif
    s->state = s->a52_init(0); /* later use CPU flags */
    s->samples = s->a52_samples(s->state);

    /* allow downmixing to stereo or mono */
    if (avctx->channels > 0 && avctx->request_channels > 0 &&
            avctx->request_channels < avctx->channels &&
            avctx->request_channels <= 2) {
        avctx->channels = avctx->request_channels;
    }

    return 0;
}
Esempio n. 3
0
static int a52_decode_init(AVCodecContext *avctx)
{
    AC3DecodeState *s = avctx->priv_data;

#ifdef CONFIG_A52BIN
    s->handle = dlopen(liba52name, RTLD_LAZY);
    if (!s->handle)
    {
	fprintf(stderr, "A52 library %s could not be opened! \n%s\n", liba52name, dlerror());
        return -1;
    }
    s->a52_init = (a52_state_t* (*)(uint32_t)) dlsymm(s->handle, "a52_init");
    s->a52_samples = (sample_t* (*)(a52_state_t*)) dlsymm(s->handle, "a52_samples");
    s->a52_syncinfo = (int (*)(uint8_t*, int*, int*, int*)) dlsymm(s->handle, "a52_syncinfo");
    s->a52_frame = (int (*)(a52_state_t*, uint8_t*, int*, sample_t*, sample_t)) dlsymm(s->handle, "a52_frame");
    s->a52_block = (int (*)(a52_state_t*)) dlsymm(s->handle, "a52_block");
    s->a52_free = (void (*)(a52_state_t*)) dlsymm(s->handle, "a52_free");
    if (!s->a52_init || !s->a52_samples || !s->a52_syncinfo
        || !s->a52_frame || !s->a52_block || !s->a52_free)
    {
	dlclose(s->handle);
        return -1;
    }
#else
    /* static linked version */
    s->handle = 0;
    s->a52_init = a52_init;
    s->a52_samples = a52_samples;
    s->a52_syncinfo = a52_syncinfo;
    s->a52_frame = a52_frame;
    s->a52_block = a52_block;
    s->a52_free = a52_free;
#endif
    s->state = s->a52_init(0); /* later use CPU flags */
    s->samples = s->a52_samples(s->state);
    s->inbuf_ptr = s->inbuf;
    s->frame_size = 0;

    return 0;
}
Esempio n. 4
0
static int a52_decode_frame(AVCodecContext *avctx,
                            void *data, int *data_size,
                            uint8_t *buf, int buf_size)
{
    AC3DecodeState *s = avctx->priv_data;
    uint8_t *buf_ptr;
    int flags, i, len;
    int sample_rate, bit_rate;
    short *out_samples = data;
    float level;
    static const int ac3_channels[8] = {
	2, 1, 2, 3, 3, 4, 4, 5
    };

    buf_ptr = buf;
    while (buf_size > 0) {
        len = s->inbuf_ptr - s->inbuf;
        if (s->frame_size == 0) {
            /* no header seen : find one. We need at least 7 bytes to parse it */
            len = HEADER_SIZE - len;
            if (len > buf_size)
                len = buf_size;
            memcpy(s->inbuf_ptr, buf_ptr, len);
            buf_ptr += len;
            s->inbuf_ptr += len;
            buf_size -= len;
            if ((s->inbuf_ptr - s->inbuf) == HEADER_SIZE) {
                len = s->a52_syncinfo(s->inbuf, &s->flags, &sample_rate, &bit_rate);
                if (len == 0) {
                    /* no sync found : move by one byte (inefficient, but simple!) */
                    memcpy(s->inbuf, s->inbuf + 1, HEADER_SIZE - 1);
                    s->inbuf_ptr--;
                } else {
		    s->frame_size = len;
                    /* update codec info */
                    avctx->sample_rate = sample_rate;
                    s->channels = ac3_channels[s->flags & 7];
                    if (s->flags & A52_LFE)
			s->channels++;
		    if (avctx->channels == 0)
			/* No specific number of channel requested */
			avctx->channels = s->channels;
		    else if (s->channels < avctx->channels) {
			av_log(avctx, AV_LOG_ERROR, "ac3dec: AC3 Source channels are less than specified: output to %d channels.. (frmsize: %d)\n", s->channels, len);
			avctx->channels = s->channels;
		    }
		    avctx->bit_rate = bit_rate;
                }
            }
        } else if (len < s->frame_size) {
            len = s->frame_size - len;
            if (len > buf_size)
                len = buf_size;

            memcpy(s->inbuf_ptr, buf_ptr, len);
            buf_ptr += len;
            s->inbuf_ptr += len;
            buf_size -= len;
        } else {
            flags = s->flags;
            if (avctx->channels == 1)
                flags = A52_MONO;
            else if (avctx->channels == 2)
                flags = A52_STEREO;
            else
                flags |= A52_ADJUST_LEVEL;
            level = 1;
            if (s->a52_frame(s->state, s->inbuf, &flags, &level, 384)) {
            fail:
                s->inbuf_ptr = s->inbuf;
                s->frame_size = 0;
                continue;
            }
            for (i = 0; i < 6; i++) {
                if (s->a52_block(s->state))
                    goto fail;
                float_to_int(s->samples, out_samples + i * 256 * avctx->channels, avctx->channels);
            }
            s->inbuf_ptr = s->inbuf;
            s->frame_size = 0;
            *data_size = 6 * avctx->channels * 256 * sizeof(int16_t);
            break;
        }
    }
    return buf_ptr - buf;
}
Esempio n. 5
0
static int a52_decode_frame(AVCodecContext *avctx,
                            void *data, int *data_size,
                            uint8_t *buf, int buf_size)
{
    AC3DecodeState *s = avctx->priv_data;
    int flags, i, len;
    int sample_rate, bit_rate;
    short *out_samples = data;
    float level;
    static const int ac3_channels[8] = {
        2, 1, 2, 3, 3, 4, 4, 5
    };

    *data_size= 0;

    if (buf_size < HEADER_SIZE) {
        av_log(avctx, AV_LOG_ERROR, "Error decoding frame, not enough bytes for header\n");
        return -1;
    }
    len = s->a52_syncinfo(buf, &s->flags, &sample_rate, &bit_rate);
    if (len == 0) {
        av_log(avctx, AV_LOG_ERROR, "Error decoding frame, no sync byte at begin\n");
        return -1;
    }
    if (buf_size < len) {
        av_log(avctx, AV_LOG_ERROR, "Error decoding frame, not enough bytes\n");
        return -1;
    }
    /* update codec info */
    avctx->sample_rate = sample_rate;
    s->channels = ac3_channels[s->flags & 7];
    if (s->flags & A52_LFE)
            s->channels++;
    if (avctx->request_channels > 0 &&
        avctx->request_channels <= 2 &&
        avctx->request_channels < s->channels) {
        avctx->channels = avctx->request_channels;
    } else {
        avctx->channels = s->channels;
    }
    avctx->bit_rate = bit_rate;
    flags = s->flags;
    if (avctx->channels == 1)
        flags = A52_MONO;
    else if (avctx->channels == 2)
        flags = A52_STEREO;
    else
        flags |= A52_ADJUST_LEVEL;
    level = 1;
    if (s->a52_frame(s->state, buf, &flags, &level, 384)) {
    fail:
        av_log(avctx, AV_LOG_ERROR, "Error decoding frame\n");
        return -1;
    }
    for (i = 0; i < 6; i++) {
        if (s->a52_block(s->state))
            goto fail;
        float_to_int(s->samples, out_samples + i * 256 * avctx->channels, avctx->channels);
    }
    *data_size = 6 * avctx->channels * 256 * sizeof(int16_t);
    return len;
}