C++ put_le32函数代码示例

static void v210_convert(void *frame_bytes, picture_t *pic, int dst_stride)
{
    int width = pic->format.i_width;
    int height = pic->format.i_height;
    int line_padding = dst_stride - ((width * 8 + 11) / 12) * 4;
    int h, w;
    uint8_t *data = (uint8_t*)frame_bytes;

    const uint16_t *y = (const uint16_t*)pic->p[0].p_pixels;
    const uint16_t *u = (const uint16_t*)pic->p[1].p_pixels;
    const uint16_t *v = (const uint16_t*)pic->p[2].p_pixels;

#define WRITE_PIXELS(a, b, c)           \
    do {                                \
        val =   clip(*a++);             \
        val |= (clip(*b++) << 10) |     \
               (clip(*c++) << 20);      \
        put_le32(&data, val);           \
    } while (0)

    for (h = 0; h < height; h++) {
        uint32_t val = 0;
        for (w = 0; w < width - 5; w += 6) {
            WRITE_PIXELS(u, y, v);
            WRITE_PIXELS(y, u, y);
            WRITE_PIXELS(v, y, u);
            WRITE_PIXELS(y, v, y);
        }
        if (w < width - 1) {
            WRITE_PIXELS(u, y, v);

            val = clip(*y++);
            if (w == width - 2)
                put_le32(&data, val);
#undef WRITE_PIXELS
        }
        if (w < width - 3) {
            val |= (clip(*u++) << 10) | (clip(*y++) << 20);
            put_le32(&data, val);

            val = clip(*v++) | (clip(*y++) << 10);
            put_le32(&data, val);
        }

        memset(data, 0, line_padding);
        data += line_padding;

        y += pic->p[0].i_pitch / 2 - width;
        u += pic->p[1].i_pitch / 2 - width / 2;
        v += pic->p[2].i_pitch / 2 - width / 2;
    }
}

static int avi_write_idx1(AVFormatContext *s)
{
    ByteIOContext *pb = s->pb;
    AVIContext *avi = s->priv_data;
    int64_t idx_chunk;
    int i;
    char tag[5];

    if (!url_is_streamed(pb)) {
        AVIStream *avist;
        AVIIentry* ie = 0, *tie;
        int empty, stream_id = -1;

        idx_chunk = ff_start_tag(pb, "idx1");
        for(i=0; i<s->nb_streams; i++){
            avist= s->streams[i]->priv_data;
            avist->entry=0;
        }

        do {
            empty = 1;
            for (i=0; i<s->nb_streams; i++) {
                avist= s->streams[i]->priv_data;
                 if (avist->indexes.entry <= avist->entry)
                     continue;

                 tie = avi_get_ientry(&avist->indexes, avist->entry);
                 if (empty || tie->pos < ie->pos) {
                     ie = tie;
                     stream_id = i;
                 }
                 empty = 0;
            }
            if (!empty) {
                avist= s->streams[stream_id]->priv_data;
                avi_stream2fourcc(&tag[0], stream_id,
                                  s->streams[stream_id]->codec->codec_type);
                put_tag(pb, &tag[0]);
                put_le32(pb, ie->flags);
                put_le32(pb, ie->pos);
                put_le32(pb, ie->len);
                avist->entry++;
            }
        } while (!empty);
        ff_end_tag(pb, idx_chunk);

        avi_write_counters(s, avi->riff_id);
    }
    return 0;
}

static int gxf_write_umf_media_description(AVFormatContext *s)
{
    GXFContext *gxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    int64_t pos;
    int i, j;

    pos = url_ftell(pb);
    gxf->umf_media_offset = pos - gxf->umf_start_offset;
    for (i = 0; i <= s->nb_streams; ++i) {
        GXFStreamContext *sc;
        int64_t startpos, curpos;

        if (i == s->nb_streams)
            sc = &gxf->timecode_track;
        else
            sc = s->streams[i]->priv_data;

        startpos = url_ftell(pb);
        put_le16(pb, 0); /* length */
        put_le16(pb, sc->media_info);
        put_le16(pb, 0); /* reserved */
        put_le16(pb, 0); /* reserved */
        put_le32(pb, gxf->nb_fields);
        put_le32(pb, 0); /* attributes rw, ro */
        put_le32(pb, 0); /* mark in */
        put_le32(pb, gxf->nb_fields); /* mark out */
        put_buffer(pb, ES_NAME_PATTERN, strlen(ES_NAME_PATTERN));
        put_be16(pb, sc->media_info);
        for (j = strlen(ES_NAME_PATTERN)+2; j < 88; j++)
            put_byte(pb, 0);
        put_le32(pb, sc->track_type);
        put_le32(pb, sc->sample_rate);
        put_le32(pb, sc->sample_size);
        put_le32(pb, 0); /* reserved */

        if (sc == &gxf->timecode_track)
            gxf_write_umf_media_timecode(pb, sc); /* 8 0bytes */
        else {
            AVStream *st = s->streams[i];
            switch (st->codec->codec_id) {
            case CODEC_ID_MPEG2VIDEO:
                gxf_write_umf_media_mpeg(pb, st);
                break;
            case CODEC_ID_PCM_S16LE:
                gxf_write_umf_media_audio(pb, sc);
                break;
            case CODEC_ID_DVVIDEO:
                gxf_write_umf_media_dv(pb, sc);
                break;
            }
        }

        curpos = url_ftell(pb);
        url_fseek(pb, startpos, SEEK_SET);
        put_le16(pb, curpos - startpos);
        url_fseek(pb, curpos, SEEK_SET);
    }
    return url_ftell(pb) - pos;
}

static int gxf_write_umf_user_data(ByteIOContext *pb, GXFContext *ctx)
{
    int64_t pos = url_ftell(pb);
    ctx->umf_user_data_offset = pos - ctx->umf_start_offset;
    put_le32(pb, 20);
    put_le32(pb,  0);
    put_le16(pb,  0);
    put_le16(pb,  0);
    put_le32(pb,  0);
    put_byte(pb,  0);
    put_byte(pb,  0);
    put_byte(pb,  0);
    put_byte(pb,  0);
    return 20;
}

static int gxf_write_flt_packet(ByteIOContext *pb, GXFContext *ctx)
{
    int64_t pos = url_ftell(pb);
    int i;

    gxf_write_packet_header(pb, PKT_FLT);

    put_le32(pb, 1000); /* number of fields */
    put_le32(pb, 0); /* number of active flt entries */

    for (i = 0; i < 1000; ++i) {
        put_le32(pb, 0);
    }
    return updatePacketSize(pb, pos);
}

static int swf_write_trailer(AVFormatContext *s)
{
    SWFContext *swf = s->priv_data;
    ByteIOContext *pb = s->pb;
    AVCodecContext *enc, *video_enc;
    int file_size, i;

    video_enc = NULL;
    for(i=0;i<s->nb_streams;i++) {
        enc = s->streams[i]->codec;
        if (enc->codec_type == CODEC_TYPE_VIDEO)
            video_enc = enc;
        else
            av_fifo_free(&swf->audio_fifo);
    }

    put_swf_tag(s, TAG_END);
    put_swf_end_tag(s);

    put_flush_packet(s->pb);

    /* patch file size and number of frames if not streamed */
    if (!url_is_streamed(s->pb) && video_enc) {
        file_size = url_ftell(pb);
        url_fseek(pb, 4, SEEK_SET);
        put_le32(pb, file_size);
        url_fseek(pb, swf->duration_pos, SEEK_SET);
        put_le16(pb, swf->video_frame_number);
        url_fseek(pb, swf->vframes_pos, SEEK_SET);
        put_le16(pb, swf->video_frame_number);
        url_fseek(pb, file_size, SEEK_SET);
    }
    return 0;
}

static DBusMessage *set_cumulative_wheel_rev(DBusConnection *conn,
						DBusMessage *msg, void *data)
{
	struct csc *csc = data;
	dbus_uint32_t value;
	struct controlpoint_req *req;
	uint8_t att_val[5]; /* uint8 opcode + uint32 value */

	if (!dbus_message_get_args(msg, NULL, DBUS_TYPE_UINT32, &value,
							DBUS_TYPE_INVALID))
		return btd_error_invalid_args(msg);

	if (csc->pending_req != NULL)
		return btd_error_in_progress(msg);

	req = g_new(struct controlpoint_req, 1);
	req->csc = csc;
	req->opcode = SET_CUMULATIVE_VALUE;
	req->msg = dbus_message_ref(msg);

	csc->pending_req = req;

	att_val[0] = SET_CUMULATIVE_VALUE;
	put_le32(value, att_val + 1);

	gatt_write_char(csc->attrib, csc->controlpoint_val_handle, att_val,
		sizeof(att_val), controlpoint_write_cb, req);

	return NULL;
}

static int avi_write_ix(AVFormatContext *s)
{
    ByteIOContext *pb = s->pb;
    AVIContext *avi = s->priv_data;
    char tag[5];
    char ix_tag[] = "ix00";
    int i, j;

    assert(!url_is_streamed(pb));

    if (avi->riff_id > AVI_MASTER_INDEX_SIZE)
        return -1;

    for (i=0;i<s->nb_streams;i++) {
        AVIStream *avist= s->streams[i]->priv_data;
         int64_t ix, pos;

         avi_stream2fourcc(&tag[0], i, s->streams[i]->codec->codec_type);
         ix_tag[3] = '0' + i;

         /* Writing AVI OpenDML leaf index chunk */
         ix = url_ftell(pb);
         put_tag(pb, &ix_tag[0]);     /* ix?? */
         put_le32(pb, avist->indexes.entry * 8 + 24);
                                      /* chunk size */
         put_le16(pb, 2);             /* wLongsPerEntry */
         put_byte(pb, 0);             /* bIndexSubType (0 == frame index) */
         put_byte(pb, 1);             /* bIndexType (1 == AVI_INDEX_OF_CHUNKS) */
         put_le32(pb, avist->indexes.entry);
                                      /* nEntriesInUse */
         put_tag(pb, &tag[0]);        /* dwChunkId */
         put_le64(pb, avi->movi_list);/* qwBaseOffset */
         put_le32(pb, 0);             /* dwReserved_3 (must be 0) */

         for (j=0; j<avist->indexes.entry; j++) {
             AVIIentry* ie = avi_get_ientry(&avist->indexes, j);
             put_le32(pb, ie->pos + 8);
             put_le32(pb, ((uint32_t)ie->len & ~0x80000000) |
                          (ie->flags & 0x10 ? 0 : 0x80000000));
         }
         put_flush_packet(pb);
         pos = url_ftell(pb);

         /* Updating one entry in the AVI OpenDML master index */
         url_fseek(pb, avist->indexes.indx_start - 8, SEEK_SET);
         put_tag(pb, "indx");                 /* enabling this entry */
         url_fskip(pb, 8);
         put_le32(pb, avi->riff_id);          /* nEntriesInUse */
         url_fskip(pb, 16*avi->riff_id);
         put_le64(pb, ix);                    /* qwOffset */
         put_le32(pb, pos - ix);              /* dwSize */
         put_le32(pb, avist->indexes.entry); /* dwDuration */

         url_fseek(pb, pos, SEEK_SET);
    }
    return 0;
}

static int gxf_write_umf_material_description(ByteIOContext *pb, GXFContext *ctx)
{
    // XXX drop frame
    uint32_t timecode =
        ctx->nb_fields / (ctx->sample_rate * 3600) % 24 << 24 | // hours
        ctx->nb_fields / (ctx->sample_rate * 60) % 60   << 16 | // minutes
        ctx->nb_fields / ctx->sample_rate % 60          <<  8 | // seconds
        ctx->nb_fields % ctx->sample_rate;                    // fields

    put_le32(pb, ctx->flags);
    put_le32(pb, ctx->nb_fields); /* length of the longest track */
    put_le32(pb, ctx->nb_fields); /* length of the shortest track */
    put_le32(pb, 0); /* mark in */
    put_le32(pb, ctx->nb_fields); /* mark out */
    put_le32(pb, 0); /* timecode mark in */
    put_le32(pb, timecode); /* timecode mark out */
    put_le64(pb, ctx->fc->timestamp); /* modification time */
    put_le64(pb, ctx->fc->timestamp); /* creation time */
    put_le16(pb, 0); /* reserved */
    put_le16(pb, 0); /* reserved */
    put_le16(pb, ctx->audio_tracks);
    put_le16(pb, 0); /* timecode track count */
    put_le16(pb, 0); /* reserved */
    put_le16(pb, ctx->mpeg_tracks);
    return 48;
}

static int gxf_write_umf_material_description(AVFormatContext *s)
{
    GXFContext *gxf = s->priv_data;
    ByteIOContext *pb = s->pb;
    int timecode_base = gxf->time_base.den == 60000 ? 60 : 50;

    // XXX drop frame
    uint32_t timecode =
        gxf->nb_fields / (timecode_base * 3600) % 24 << 24 | // hours
        gxf->nb_fields / (timecode_base * 60) % 60   << 16 | // minutes
        gxf->nb_fields /  timecode_base % 60         <<  8 | // seconds
        gxf->nb_fields %  timecode_base;                     // fields

    put_le32(pb, gxf->flags);
    put_le32(pb, gxf->nb_fields); /* length of the longest track */
    put_le32(pb, gxf->nb_fields); /* length of the shortest track */
    put_le32(pb, 0); /* mark in */
    put_le32(pb, gxf->nb_fields); /* mark out */
    put_le32(pb, 0); /* timecode mark in */
    put_le32(pb, timecode); /* timecode mark out */
    put_le64(pb, s->timestamp); /* modification time */
    put_le64(pb, s->timestamp); /* creation time */
    put_le16(pb, 0); /* reserved */
    put_le16(pb, 0); /* reserved */
    put_le16(pb, gxf->audio_tracks);
    put_le16(pb, 1); /* timecode track count */
    put_le16(pb, 0); /* reserved */
    put_le16(pb, gxf->mpeg_tracks);
    return 48;
}

static int asf_write_index(AVFormatContext *s, ASFIndex *index, uint16_t max, uint32_t count)
{
    ByteIOContext *pb = s->pb;
    int i;

    put_guid(pb, &ff_asf_simple_index_header);
    put_le64(pb, 24 + 16 + 8 + 4 + 4 + (4 + 2)*count);
    put_guid(pb, &ff_asf_my_guid);
    put_le64(pb, ASF_INDEXED_INTERVAL);
    put_le32(pb, max);
    put_le32(pb, count);
    for(i=0; i<count; i++) {
        put_le32(pb, index[i].packet_number);
        put_le16(pb, index[i].packet_count);
    }

    return 0;
}

void end_tag(ByteIOContext *pb, offset_t start)
{
    offset_t pos;

    pos = url_ftell(pb);
    url_fseek(pb, start - 4, SEEK_SET);
    put_le32(pb, (uint32_t)(pos - start));
    url_fseek(pb, pos, SEEK_SET);
}

static int avi_write_idx1(AVFormatContext *s)
{
    ByteIOContext *pb = &s->pb;
    AVIContext *avi = s->priv_data;
    offset_t idx_chunk;
    int i;
    char tag[5];

    if (!url_is_streamed(pb)) {
        AVIIentry* ie = 0, *tie;
        int entry[MAX_STREAMS];
        int empty, stream_id = -1;

        idx_chunk = start_tag(pb, "idx1");
        memset(&entry[0], 0, sizeof(entry));
        do {
            empty = 1;
            for (i=0; i<s->nb_streams; i++) {
                 if (avi->indexes[i].entry <= entry[i])
                     continue;

                 tie = avi_get_ientry(&avi->indexes[i], entry[i]);
                 if (empty || tie->pos < ie->pos) {
                     ie = tie;
                     stream_id = i;
                 }
                 empty = 0;
            }
            if (!empty) {
                avi_stream2fourcc(&tag[0], stream_id,
                                  s->streams[stream_id]->codec->codec_type);
                put_tag(pb, &tag[0]);
                put_le32(pb, ie->flags);
                put_le32(pb, ie->pos);
                put_le32(pb, ie->len);
                entry[stream_id]++;
            }
        } while (!empty);
        end_tag(pb, idx_chunk);

        avi_write_counters(s, avi->riff_id);
    }
    return 0;
}

static int sox_write_header(AVFormatContext *s)
{
    SoXContext *sox = s->priv_data;
    ByteIOContext *pb = s->pb;
    AVCodecContext *enc = s->streams[0]->codec;
    AVMetadataTag *comment;
    size_t comment_len = 0, comment_size;

    comment = av_metadata_get(s->metadata, "comment", NULL, 0);
    if (comment)
        comment_len = strlen(comment->value);
    comment_size = (comment_len + 7) & ~7;

    sox->header_size = SOX_FIXED_HDR + comment_size;

    if (enc->codec_id == CODEC_ID_PCM_S32LE) {
        put_tag(pb, ".SoX");
        put_le32(pb, sox->header_size);
        put_le64(pb, 0); /* number of samples */
        put_le64(pb, av_dbl2int(enc->sample_rate));
        put_le32(pb, enc->channels);
        put_le32(pb, comment_size);
    } else if (enc->codec_id == CODEC_ID_PCM_S32BE) {
        put_tag(pb, "XoS.");
        put_be32(pb, sox->header_size);
        put_be64(pb, 0); /* number of samples */
        put_be64(pb, av_dbl2int(enc->sample_rate));
        put_be32(pb, enc->channels);
        put_be32(pb, comment_size);
    } else {
        av_log(s, AV_LOG_ERROR, "invalid codec; use pcm_s32le or pcm_s32be\n");
        return -1;
    }

    if (comment_len)
        put_buffer(pb, comment->value, comment_len);

    for ( ; comment_size > comment_len; comment_len++)
        put_byte(pb, 0);

    put_flush_packet(pb);

    return 0;
}

static inline void put_uuid_le(const bt_uuid_t *src, void *dst)
{
	if (src->type == BT_UUID16)
		put_le16(src->value.u16, dst);
	else if (src->type == BT_UUID32)
		put_le32(src->value.u32, dst);
	else
		/* Convert from 128-bit BE to LE */
		bswap_128(&src->value.u128, dst);
}